WO2017209010A1 - Article absorbant - Google Patents

Article absorbant Download PDF

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Publication number
WO2017209010A1
WO2017209010A1 PCT/JP2017/019769 JP2017019769W WO2017209010A1 WO 2017209010 A1 WO2017209010 A1 WO 2017209010A1 JP 2017019769 W JP2017019769 W JP 2017019769W WO 2017209010 A1 WO2017209010 A1 WO 2017209010A1
Authority
WO
WIPO (PCT)
Prior art keywords
group
liquid film
liquid
absorbent article
cleaving agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/019769
Other languages
English (en)
Japanese (ja)
Inventor
華 鈴木
吉晃 蒲谷
裕太 寒川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kao Corp
Original Assignee
Kao Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kao Corp filed Critical Kao Corp
Priority to CN201780033450.2A priority Critical patent/CN109311286B/zh
Publication of WO2017209010A1 publication Critical patent/WO2017209010A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin

Definitions

  • the present invention relates to an absorbent article such as a sanitary napkin.
  • a blood slipperiness imparting agent is included in the top sheet from the viewpoint of making the top sheet after menstrual blood absorption smooth.
  • the blood slipperiness-imparting agent has a certain affinity with menstrual blood and is said to be able to migrate into the absorber together with menstrual blood.
  • this invention is an absorbent article which has a surface sheet, a back sheet, and the absorber between the said surface sheet and a back sheet, Comprising:
  • the said absorbent article is a wearer on the skin contact surface side.
  • An excretory liquid diffusion region between the excretory mouth facing portion, the topsheet has a containing portion and a non-containing portion of the following compound C1, and the containing portion is included in the excretory mouth facing portion.
  • An absorbent article is provided.
  • Compound C1 A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
  • this invention is an absorbent article which has a surface sheet, a back sheet, and the absorber between the said surface sheet and a back sheet, Comprising:
  • the said absorbent article is a wearer on the skin contact surface side.
  • An excretory liquid diffusion region between the excretory mouth facing portion, the topsheet has a containing portion and a non-containing portion of the following compound C2, and the containing portion is included in the excretory mouth facing portion.
  • An absorbent article is provided.
  • Compound C2 A compound whose water solubility is 0 g or more and 0.025 g or less, the expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less .
  • (A) is a non-containing part of a grid
  • (B) shows a pattern in which a plurality of non-contained portions in the shape of rhombus are arranged apart from each other on the surface of the nonwoven fabric.
  • (A) is a containing part extended in the longitudinal direction of a nonwoven fabric surface, and a non-containing part in the width direction.
  • the pattern alternately arranged is shown, and (B) shows the pattern alternately arranged in the longitudinal direction of the containing part and the non-containing part extending in the width direction of the nonwoven fabric surface.
  • (A) 1 shows a partially enlarged view of the pattern of FIG. 1
  • (B) shows a pattern in which the containing portion of (A) is elliptical
  • (C) shows a partially enlarged view of the pattern of FIG. D) shows the pattern of FIG.
  • FIG. 1 It is a schematic diagram which shows the liquid film formed in the clearance gap between the fibers of the nonwoven fabric which comprises a surface sheet.
  • (A1) to (A4) are explanatory views schematically showing from the side the state in which the liquid film cleaving agent according to the present invention cleaves the liquid film
  • (B1) to (B4) are liquid crystals according to the present invention. It is explanatory drawing which shows typically the state which a film
  • the present invention relates to an absorbent article with improved leakage prevention while reducing the liquid film formed between the fibers of the surface sheet to achieve a higher level of liquid residue reduction.
  • the nonwoven fabric used for the surface sheet (the top sheet) that is the skin contact member of the absorbent article has a narrow region between the fibers. Even if there is a space in the area that can pass excretory fluid (for example, urine and menstrual blood, also simply liquid), meniscus force between fibers, surface activity by plasma proteins, and blood surface viscosity are high. A stable liquid film is formed between the fibers, and the liquid tends to stay. In the prior art, the liquid film cannot be completely eliminated, and there is still room for improvement in the dryness. Furthermore, in recent years, in addition to dryness, consumers are demanding good touch. Therefore, the use of fine fibers has been performed. However, when thin fibers are used, the distance between the fibers becomes narrower.
  • excretory fluid for example, urine and menstrual blood, also simply liquid
  • the absorption target liquid is not limited to blood.
  • urine since urine also has surface activity due to phospholipids, a liquid film is formed in the same manner as described above, leading to liquid residue, and there is still room for improvement in dryness. Therefore, there is a demand for a technique for removing a liquid film that can form a narrow portion between fibers in a nonwoven fabric.
  • the absorbent article of the present invention can improve the leak-proof property while reducing the liquid film formed between the fibers of the surface sheet to achieve a higher level of liquid residue reduction.
  • the sanitary napkin 10 as the preferable embodiment is shown, and it demonstrates below, referring drawings.
  • the side in contact with the human body is referred to as the skin surface side, the skin contact surface side or the surface side, and the opposite side is referred to as the non-skin surface side, the non-skin contact surface side or the back surface side. That's it.
  • the direction positioned on the front side of the human body when worn is referred to as the front, and its end is referred to as the front end, and the direction positioned on the rear is referred to as the rear, and the end is referred to as the rear end.
  • the normal line direction of the surface or back surface of an absorbent article is called thickness direction, and the quantity is called thickness.
  • a sanitary napkin 10 (hereinafter, also simply referred to as a napkin 10) of the present embodiment is a liquid-permeable surface sheet 1 disposed on the skin contact surface side, the non-skin contact surface side. And a liquid-retaining absorbent 3 disposed between the two sheets. Further, a pair of water-repellent side sheets 4 covers the skin contact surface sides on both sides in the longitudinal direction of the top sheet 1 and extends outward in the width direction. The side sheet 4 extending in the width direction is joined to the top sheet 1 and the back sheet 2 without the absorber 3 interposed therebetween.
  • the center portion in the longitudinal direction extends further in the width direction to form a pair of wing portions 5 and 5.
  • the arrangement position of the wing part 5 may not necessarily be a central part in the longitudinal direction, and can be appropriately changed according to the length of the napkin set according to the purpose of use and the like. Moreover, the wing part 5 is provided arbitrarily and the form which does not have may be sufficient.
  • the sanitary napkin 10 has a vertically long shape having a vertical direction (Y direction) and a horizontal direction (X direction) orthogonal to the vertical direction.
  • the napkin 10 is arranged with the top sheet 1 side facing the wearer's skin contact surface side and the vertical direction (Y direction) extending from the lower abdomen side to the buttocks side, and the width direction (X direction) between the left and right legs. It is worn in the direction of the connection.
  • the napkin 10 has a crotch part C covering the excretion part of the wearer in the vertical direction (Y direction), a front part F corresponding to the lower abdomen side in front of the crotch part C, and a rear part.
  • a portion sandwiched between the pair of wing portions 5 and 5 is a crotch portion C, and front and rear portions thereof are a front portion F and a rear portion R.
  • the section of the crotch part C, the front part F, and the rear part R can be appropriately changed according to the length of the napkin and the like as in the position of the wing part 5 described above.
  • the sanitary napkin 10 of the present embodiment shows an example of a shape set for daytime or the like, and the front part F, the crotch part C, and the rear part R are divided into about three equal lengths in the vertical direction. Is set.
  • the front part F, the crotch part C, and the rear part R are divided into about three equal lengths in the vertical direction. Is set.
  • the crotch C is closer to the front of the napkin.
  • the crotch part C can be set as a part at a certain distance from the front part F regardless of the shape of the napkin 10.
  • the top sheet 1 is made of a hydrophilic nonwoven fabric and has a liquid film cleaving agent containing part 6 and a non-containing part 7.
  • positioning of the containing part 6 and the non-containing part 7 can take various, and is not shown in FIG. 3 to 7 show some specific examples of the region 18 in which the liquid film cleaving agent containing part 6 and the non-containing part 7 are mixedly arranged.
  • the containing part 6 and the non-containing part 7 are classified according to the presence or absence of a liquid film cleaving agent. 3 to 6 to be described later, the containing portion 6 is shown with a pattern for understanding the arrangement region and arrangement pattern of the containing portion 6 and the non-containing portion 7, but in actuality, it can be distinguished visually. Not necessarily. Therefore, the classification of the above-mentioned containing part 6 and non-containing part 7 is confirmed not by visual observation but by the following method. That is, after destined paper and toasted to the surface of the top sheet 1, carrying the acrylic plate having a thickness of 4 mm, for 30 seconds load in weight so that the 600 g / cm 2 from above.
  • the oil-blotting paper is peeled off, and the oil-blotting paper is placed on a black mount and the color change is visually confirmed.
  • the part where the color has changed is the containing part 6 containing the liquid film cleaving agent, and the other part is the non-containing part 7.
  • Various materials can be used as the above-mentioned oil blotting paper, and examples thereof include gold leaf punching paper manufacturing oil blotting paper manufactured by Katani Sangyo Co., Ltd.
  • the above method for confirming the classification is similarly used in the measurement of the area ratio of the containing portion 6.
  • the liquid film cleaving agent contained in the containing portion 6 is a liquid film formed between the fibers or on the fiber surface when a liquid, for example, highly viscous liquid such as menstrual blood or excretion liquid such as urine touches the surface sheet 1. It refers to an agent that inhibits the formation of a liquid film by cleaving it, and has an action of cleaving the formed liquid film and an action of inhibiting the formation of the liquid film.
  • the former can be called the main action, and the latter can be called the subordinate action.
  • the cleaving of the liquid film is performed by the action of the liquid film cleaving agent to destabilize by pushing away a part of the liquid film layer.
  • the liquid film cleaving agent containing portion 6 is a portion having excellent liquid permeability in the surface sheet 1. Thereby, even if the fiber which comprises the nonwoven fabric of the surface sheet 1 is made thin and the distance between fibers is narrowed, softness of touch and liquid remaining suppression are compatible.
  • the liquid film cleaving agent used in the present invention has the property of eliminating the liquid film, and due to this property, the liquid film cleaving agent is applied to a test liquid or artificial urine mainly composed of plasma components. Moreover, the liquid film disappearance effect can be expressed. Artificial urine is 1.940% by weight of urea, 0.795% by weight of sodium chloride, 0.110% by weight of magnesium sulfate, 0.062% by weight of calcium chloride, 0.197% by weight of potassium sulfate, red No.
  • the surface tension of a mixture having a composition of 0.010% by weight, water (about 96.88% by weight) and polyoxyethylene lauryl ether (about 0.07% by weight) was adjusted to 53 ⁇ 1 mN / m (23 ° C.).
  • the liquid film disappearance effect here refers to the effect of inhibiting the liquid film formation of the structure and the formed structure of the structure in which air is held by the liquid film formed from the test liquid or artificial urine. It can be said that an agent that exhibits both of the effects of disappearing the body and that exhibits at least one of the effects has the property of exhibiting the effect of disappearing the liquid film.
  • the test solution is a liquid component extracted from equine defibrinated blood (manufactured by Nippon Biotest Co., Ltd.). Specifically, when 100 mL of equine defibrinated blood is allowed to stand at a temperature of 22 ° C. and a humidity of 65% for 1 hour, the equine defibrinated blood is separated into an upper layer and a lower layer. It is.
  • the upper layer mainly contains plasma components
  • the lower layer mainly contains blood cell components.
  • a transfer pipette manufactured by Nippon Micro Corporation
  • Whether or not a certain agent has the above-mentioned property of “disappearing the liquid film” depends on the occurrence of a structure in which air is trapped by the liquid film formed from the test solution or artificial urine to which the agent is applied. This is judged by the amount of the structure, that is, the liquid film when it is in an easy state. That is, the test solution or artificial urine is adjusted to a temperature of 25 ° C., and then 10 g is put into a screw tube (No. 5 body diameter 27 mm, total length 55 mm, manufactured by Maruemu Co., Ltd.) to obtain a standard sample.
  • a screw tube No. 5 body diameter 27 mm, total length 55 mm, manufactured by Maruemu Co., Ltd.
  • a measurement sample obtained by adding 0.01 g of an agent to be measured, which is adjusted in advance to 25 ° C., to the same sample as the standard sample is obtained.
  • the standard sample and the measurement sample are vigorously shaken twice in the vertical direction of the screw tube, and then quickly placed on a horizontal plane. By shaking the sample, the structure of the liquid layer (lower layer) without the structure and a large number of structures formed on the liquid layer (the lower layer) is formed inside the screw tube after shaking. Upper layer). After the elapse of 10 seconds immediately after shaking, the height of the structure layers of both samples (the height from the liquid surface of the liquid layer to the upper surface of the structure layer) is measured.
  • the agent to be measured has a liquid film cleavage effect.
  • the liquid film cleaving agent used in the present invention satisfies the above properties by a single compound that meets the above properties, a mixture of a plurality of single compounds that meet the above properties, or a combination of a plurality of compounds (liquid Agent capable of developing membrane cleavage). That is, the liquid film cleaving agent is an agent limited to those having a liquid film cleaving effect as defined above.
  • the compound applied in the absorbent article contains a third component that does not meet the above definition, it is distinguished from a liquid film cleaving agent.
  • the “single compound” is a concept including compounds having the same composition formula but having different molecular weights due to different numbers of repeating units.
  • the liquid film cleaving agent it can be appropriately selected from those described in paragraphs [0007] to [0186] of the specification of WO2016 / 098796.
  • That the containing part 6 of the topsheet 1 contains or contains a liquid film cleaving agent mainly means that it is attached to the surface of the fiber.
  • the liquid film cleaving agent may be a liquid film cleaving agent that is encapsulated in the fiber or that is present inside the fiber by internal addition.
  • a method for attaching the liquid film cleaving agent to the fiber surface various commonly used methods can be employed without any particular limitation. For example, flexographic printing, ink jet printing, gravure printing, screen printing, spraying, brush coating method and the like can be mentioned.
  • These treatments may be carried out after the fibers are made into a web by various methods, and then after the web is made into a nonwoven fabric or incorporated into an absorbent article.
  • the fiber having the liquid film cleaving agent attached to the surface is dried at a temperature sufficiently lower than the melting point of the fiber resin (for example, 120 ° C. or less) by, for example, a hot air blowing type dryer.
  • the liquid film cleaving agent In order for the liquid film cleaving agent to have a liquid film cleaving effect, which will be described later, in the nonwoven fabric, the liquid film cleaving agent needs to exist as a liquid when it comes into contact with body fluid. From this point, the melting point of the liquid film cleaving agent according to the present invention is preferably 40 ° C. or less, and more preferably 35 ° C. or less. Furthermore, the melting point of the liquid film cleaving agent according to the present invention is preferably ⁇ 220 ° C. or higher, more preferably ⁇ 180 ° C. or higher.
  • the liquid film cleaving agent has a smaller surface tension than conventional hydrophilizing agents used for nonwoven fabric fibers. That is, the contact angle of the constituent fibers of the containing part 6 is larger than the contact angle of the constituent fibers of the non-containing part 7. Therefore, the constituent fibers of the containing portion 6 are given lubricity or hydrophobicity by the liquid film cleaving agent, and increase the slidability of excretory liquid on the surface of the topsheet 1 as compared with the case without the liquid film cleaving agent. In particular, when the effluent is first received from a dry surface, the effluent tends to flow out of the surface. On the other hand, since the non-containing part 7 does not have a liquid film cleaving agent, it acts to prevent the excretory liquid from flowing out on the surface of the top sheet 1.
  • the surface sheet 1 has the containing part 6 which reduces the residual of the excretory liquid as a liquid film by the action of the liquid film cleaving agent, and the non-containing part 7 which suppresses the surface flow of the excretory liquid on the surface sheet 1.
  • the surface sheet of the sanitary napkin 10 is appropriately disposed by including the containing part 6 and the non-containing part 7 in accordance with the functions of the excretory opening facing part 11, the excretory liquid diffusion region 12 and the thickness recessed part 8 of the top sheet 1. Leakage can be improved while reducing the liquid film formed between the fibers and reducing the liquid residue at a higher level.
  • the sanitary napkin 10 has an excretion opening facing portion 11 that faces the skin contact surface side, that is, the surface sheet 1 by contacting the excretion opening of the wearer.
  • the excretion opening facing portion 11 is a liquid receiving portion that directly receives the wearer's excretion fluid, and is a portion that allows the excretion fluid to permeate the absorbent body 3.
  • the excretion opening opposing part 11 processes the most excretion liquid.
  • the excretion opening facing portion 11 is located in the center of the crotch portion C in the width direction.
  • the position of the excretion opening facing portion 11 is not limited to the position shown in the present embodiment, and can be changed depending on the length of the article as in the case of the crotch C. In general, it can be set as a part at a certain distance from the front part F.
  • the position of the excretion opening facing portion 11 can be defined as follows.
  • the sanitary napkin 10 is disposed on the skin contact surface side so as to surround the excretory opening facing portion 11 and extend in the surface direction, and the thickness recesses (leak-proof grooves) of the topsheet 1 and the absorbent body 3. 8 has.
  • the arrangement in the surface direction of the thickness recess 8 may be continuous or discontinuous.
  • the thickness concave portion 8 is a portion formed by squeezing from the skin contact surface side of the topsheet 1 into the absorbent body 3 by embossing or the like in the thickness direction of the sanitary napkin 10.
  • both the surface sheet 1 and the absorbent body 3 located in the thickness recess 8 are in a state of being depressed and integrated from the skin contact surface side to the non-skin contact surface side. Therefore, the surface sheet 1 and the absorbent body 3 of the concave wall portion and the concave bottom portion (not shown) in the thickness concave portion 8 have a higher fiber density than other portions, and have a strong pulling force for excretory fluid.
  • the thickness recessed part 8 is a part by which the surface sheet 1 and the absorber 3 were squeezed integrally, and the surface sheet 1 only or the part by which only the absorber 3 was squeezed is not included.
  • the thickness concave portion 8 has a function of protecting the liquid from leaking from the outer periphery of the napkin 10 when the excretion liquid diffuses in the surface direction from the excretion opening facing portion 11. That is, the depression from the skin contact surface side to the non-skin contact surface side blocks the diffusion path in the surface direction of the excretory liquid, and draws the excretion liquid into the absorbent body 3 in the thickness direction with a high fiber density. Enhance locally to prevent liquid diffusion.
  • the thickness concave portion 8 can be the last fort to prevent liquid leakage in the topsheet 1.
  • the thickness recesses 8 are linearly arranged with a predetermined width in the surface direction of the napkin 10 in a state of being depressed in the thickness direction as described above.
  • the thickness recessed part 8 of this embodiment has an annular plane shape by continuous arrangement. More specifically, it is an annular shape that surrounds the excretory opening facing portion 11 of the crotch part C, extends to the front portion F and the rear portion R side from the excretion opening facing portion 11, and is connected to the end portion.
  • the ring has an inward constriction at two points in the extending length from the crotch part C toward the front part F and the rear part R (four places in total on the left and right sides).
  • the planar shape of the thickness recessed part 8 is not limited to the shape of this embodiment, A various shape can be taken if it has the function which can surround the excretion opening
  • the thickness concave portion 8 is not limited to being continuously arranged in the plane direction as a planar shape, but may be an aggregate of lines arranged discontinuously. For example, it may be discontinuous having one or two or more spaced portions in the middle of the linear portion of the continuous annular thickness recess 8 shown in FIG. 1 (not shown).
  • the linear portions of the thickness recesses 8 which are discontinuous may be partially arranged in parallel in the width direction to enhance the liquid diffusion protection in the width direction.
  • a linear portion of another thickness recess may be added in the width direction or the vertical direction to enhance the liquid diffusion protection in the vertical direction and the width direction. For example, in the specific example of FIG.
  • the thickness recesses 81 and 82 and the thickness recesses 82 and 83 are partially arranged in parallel in the width direction.
  • a thickness recess 84 is additionally arranged in the region surrounded by the thickness recesses 81 to 83.
  • the above-described linear portion may be a linear array of, for example, dot-shaped thickness concave portions that are separated into a plurality of portions (not shown).
  • the thickness recessed part 8 may consist of multiple types with different depths, and the multiple types may be arranged alternately to form the linear portion (not shown).
  • the excretory fluid diffusion region 12 is arranged outside the excretory opening facing portion 11.
  • the excretory fluid diffusion region 12 is a region of the topsheet 1 between the thickness recessed portion 8 and the excretion opening facing portion 11.
  • region 12 is demarcated as follows. That is, the excretory fluid diffusion region 12 is defined as a region between the contour line connecting the outermost linear portions in the width direction of the linear portions spaced apart by the thickness concave portion 8 and the excretory opening facing portion 11.
  • the outline 88 is defined by connecting the outermost linear portions in the width direction of the thickness recesses 81, 82, and 83 in the longitudinal direction. A region between the outline 88 and the excretion opening facing portion 11 becomes the excretion fluid diffusion region 12.
  • the excretory fluid diffusion region 12 is a region where the excretion fluid received by the excretion opening facing portion 11 is diffused in the surface direction, and at the same time, the excretion fluid is transmitted to the absorber 3.
  • the excretory fluid diffusion region 12 can reduce the amount of excretory fluid reaching the thickness concave portion 8 by permeating into the absorber 3 in the excretion fluid diffusion process. Thereby, the liquid leak prevention property of the napkin 10 can be improved more.
  • the topsheet 1 has the liquid film cleaving agent containing part 6 and the non-containing part 7.
  • the topsheet 1 has the containing part 6 in the excretory opening facing part 11.
  • mouth opposing part 11 can raise liquid permeability by the effect
  • the excretory opening facing portion 11 may be a region composed of only the containing portion 6 or may be a region 18 in which the containing portion 6 and the non-containing portion 7 are mixedly arranged.
  • the excretion liquid diffusion region 12 and the thickness recessed portion 8 have a lower area ratio of the containing portion 6 than the excretion opening facing portion 11 and a large number of non-containing portions 7 from the viewpoint of the liquid flow preventing property described later.
  • the thickness recessed portion 8 is not provided with the containing portion 6 but only the non-containing portion 7. That is, the area of the containing portion 6 so that the excretion opening facing portion 11 is an area where the liquid permeation function is enhanced, and the excretion liquid diffusion area 12 and the thickness recess 8 are the areas where the liquid flow suppression function is enhanced. It is preferable to set the rate in each region. A preferable range of the area ratio of the containing part 6 will be described later together with an explanation of the action of the containing part 6 and the non-containing part 7.
  • the excretion opening facing portion 11 is preferably a portion in which a lot of liquid film cleaving agent containing portions 6 are arranged as a portion having the largest amount of excretion liquid as a liquid receiving portion and the liquid permeation function is enhanced. At this time, it is preferable to set the area ratio of the containing portion 6 that can sufficiently exhibit the liquid film cleaving action in consideration of the expansibility (macro expansibility) of the liquid film cleaving agent described later on the liquid film.
  • the area ratio of the containing part 6 in the excretory opening facing part 11 ( ⁇ the area of the containing part / the sum of the areas of the containing part and the non-containing part ⁇ ⁇ 100) is the liquid film as the excretion opening facing part 11 as a whole. From the viewpoint of maintaining the action of the cleaving agent and, as a result, maintaining liquid permeability, it is preferably 50% or more, more preferably 60% or more, and even more preferably 70% or more. In particular, when the area ratio of the containing part 6 is 50% or more, the liquid film cleaving action is sufficiently exhibited and the remaining liquid amount is minimized.
  • the upper limit of the area ratio of the containing part 6 in the excretion opening facing part 11 is not particularly limited and may be 100%. However, from the viewpoint of liquid flow suppression, that is, before the excretion liquid permeates sufficiently in the thickness direction. From the viewpoint of preventing liquid from flowing into the excretory fluid diffusion region 12, it is preferably less than 100%, more preferably 95% or less, and still more preferably 90% or less. Thereby, in the excretion opening
  • the area ratio of the containing portion 6 in the excretory opening facing portion 11 may be 50% or more and 100% or less, but is preferably 50% or more and less than 100%, and preferably 60% or more from the viewpoint of coexistence of liquid permeability and liquid flow suppression. 95% or less is more preferable, and 70% or more and 90% or less is still more preferable.
  • the excretory fluid diffusion area 12 is an area where the excretion liquid diffuses from the excretion opening facing portion 11 at a constant speed. Therefore, it is preferable that the excretion liquid diffusion region 12 has a higher liquid flow suppression function than the excretion opening facing portion 11. From this viewpoint, it is preferable that the area ratio of the containing part 6 in the excretory fluid diffusion region 12 is lower than the area ratio of the containing part 6 in the excretory opening facing part 11. Specifically, the area ratio of the containing portion 6 in the excretory fluid diffusion region 12 is preferably 50% or less, more preferably 40% or less, and still more preferably 30% or less.
  • the excretory fluid diffusion region 12 it is possible to reduce the amount of effluent as much as possible by allowing the excreted fluid that has flown to permeate the absorbent body 3 before the thickness concave portion 8, from the viewpoint of improving the leak-proof property of the napkin 10. preferable. Therefore, the area ratio of the containing portion 6 in the excretory fluid diffusion region 12 is 5 from the viewpoint of having a permeability that can sufficiently cope with the action of the liquid film cleaving agent in consideration of the amount of the excretory fluid to diffuse. % Or more, preferably 10% or more, and more preferably 20% or more.
  • the area ratio of the containing portion 6 in the excretion fluid diffusion region 12 is preferably 5% or more and 50% or less. 10% to 40% is more preferable, and 20% to 30% is more preferable.
  • the thickness recess 8 is a portion in which the surface sheet 1 and the absorbent body 3 have a higher fiber density than the other portions, so that the capillary force acts strongly and has a high liquid drawing force. Moreover, since the surface sheet 1 and the absorber 3 in the thickness recessed part 8 are integrated in a compacted state, the excretory fluid is easily absorbed directly into the absorber 3. Therefore, in the thickness recessed part 8, even if the area ratio of the containing part 6 is made smaller than the excretion liquid diffusion region 12 and the excretion opening facing part 11, the liquid can be sufficiently drawn.
  • the thickness recessed part 8 is a part which strengthened the function which interrupt
  • a part of the non-containing portion 7 is disposed adjacent to the thickness recessed portion 8. That is, a part of the non-contained portion 7 of the excretory fluid diffusion region 12 is arranged so as to be connected to the inner edge (exhaust fluid diffusion region 12 side) of the linear portion extending in the surface direction of the thickness recess 8. Is preferred. Furthermore, it is preferable that a part of the non-containing part 7 of the excretory liquid diffusion region 12 is arranged so as to border the entire linear part in the surface direction of the thickness recessed part 8 in the adjacent state.
  • the flow rate of the excretion liquid further diffusing into the thickness concave portion 8 in the excretion fluid diffusion region 12 is largely suppressed, and the liquid flow blocking function of the thickness concave portion 8 is enhanced.
  • the aspect which the partial enlarged plan view of FIG. 3 shows is mentioned.
  • the non-containing part 71 is distribute
  • it is preferable that the non-containing part 71 is disposed adjacently so as to border the entire circumference of the annular planar shape of the thickness recessed part 8. In FIG.
  • both the excretory opening facing part 11 and the excretion liquid diffusion area 12 are an area 18 in which the liquid film cleaving agent containing part 6 and the non-containing part 7 are mixedly arranged, and the excretion opening facing part 11 is excreted.
  • the area ratio of the containing portion 6 is set higher than that of the liquid diffusion region 12.
  • the circular (dot-shaped) containing parts 6 are spaced apart from each other and arranged in a plurality of directions, and the non-containing part 7 is formed therebetween.
  • region 12 the linear containing part 6 is distribute
  • the aspect of FIG. 3 is an example, and the planar shape of the containing part 7 and the non-containing part 7, the mixed arrangement pattern, and the area ratio of the containing part 6 are not limited to this and can be variously adopted.
  • the non-containing part 7 is adjacent to the plurality of containing parts 6 and is arranged continuously or intermittently so as to separate the containing parts 6 from each other.
  • sequence of the non-containing part 7 said here is an arrangement
  • positioning of the non-containing part 7 is that the some non-containing part 7 isolate
  • one droplet includes the containing portion 6 containing the liquid film cleaving agent, It overlaps over both the non-containing part 7 which does not contain a film cleaving agent. In such an overlap, the liquid film cleaving action in the containing part 6 and the liquid flow suppressing action by the non-containing part are simultaneously expressed for the droplet.
  • the surface flow preventing property of the liquid described above is that the non-containing part 7 that does not contain the liquid film cleaving agent is arranged continuously or intermittently in a plurality of directions, thereby suppressing the occurrence of liquid flow on the nonwoven fabric surface, And even if a liquid flow arises, it is because the liquid flow prevention effect
  • a liquid film cleaving agent such as between the fibers of the topsheet 1 is obtained by overlapping the droplets over both the containing part 6 containing the liquid film cleaving agent and the non-containing part 7 not containing the liquid film cleaving agent.
  • the liquid film is cleaved by this action, and the permeability of the liquid in the thickness direction of the surface sheet is increased.
  • a liquid film cleaving agent is provided with the expansibility with respect to a liquid as it mentions later, in the area
  • the liquid film cleaving agent of the containing part 6 expands to the non-containing part 7 with respect to the droplets that are present and whose liquid flow is suppressed. That is, the liquid film cleaving agent is not only expanded on a liquid film in a narrow region such as between fibers in the containing portion 6 described later (micro-expansion), but also from the containing portion 6 that overlaps the droplet to the non-containing portion 7.
  • the liquid surface flow preventing property can be enhanced while exhibiting a high liquid remaining reducing action.
  • the above-described liquid flow preventing action is particularly effective in that the liquid permeation path that allows the liquid to permeate in the thickness direction is opened when the liquid first touches the top sheet 1. That is, at the initial stage when the surface of the nonwoven fabric is not familiar with the liquid, the liquid flow is difficult to enter between the fibers due to the hydrophobicity of the fiber surface due to the liquid film cleaving agent, so that the liquid flow prevention action described above, Gives the liquid droplets time to enter between the fibers. On the other hand, once the liquid has permeated through the nonwoven fabric and the liquid permeation passage is secured, the liquid easily enters between the fibers, and the liquid film cleaving action by the liquid film cleaving agent is more strongly exhibited.
  • Macro expansion of the liquid film cleaving agent from the containing part 6 to the non-containing part 7 tends to occur depending on the case where the droplet is menstrual blood or the like. Therefore, the reduction of the liquid residue due to the macro expandability is particularly effectively exhibited in the region 18 where the containing portion 6 and the non-containing portion 7 in the topsheet 1 of the sanitary napkin 10 are mixedly arranged.
  • the degree of macro expansibility of the liquid film cleaving agent from the containing part 6 to the non-containing part 7 depends on various factors. For example, the larger the expansion coefficient described later, the longer the expansion distance in the droplet, and the higher the expandability. Moreover, the expansion distance in a droplet becomes long and the high expansibility is shown, so that the containing basis weight of the liquid film cleaving agent in the containing part 6 is large. Similarly, the liquid film cleaving agent exhibits a suitable high expansibility for droplets by moderately suppressing the viscosity.
  • the viscosity of the liquid film cleaving agent is 0 cps or more, preferably 10,000 cps or less, more preferably 1000 cps or less, and further preferably 200 cps or less.
  • the viscosity of the liquid film cleaving agent can be measured by the following method. First, 40 g of a liquid film cleaving agent is prepared. Next, the viscosity of the liquid film cleaving agent is measured using a tuning fork type vibration viscometer SV-10 (manufactured by A & D Co., Ltd.) in an environmental region of a temperature of 25 ° C. and a relative humidity (RH) of 65%. This is repeated three times, and the average value is adopted as the viscosity.
  • SV-10 tuning fork type vibration viscometer
  • the liquid film cleaving agent When the liquid film cleaving agent is solid, the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid, and the measurement is carried out while maintaining the temperature condition.
  • a liquid film cleaving agent is taken out from a fiber by the method used in measurement of the expansion coefficient etc. which are mentioned later. In this case, when only a small amount can be taken out for the measurement, identification is performed in the same manner as in the case of measuring an expansion coefficient, which will be described later.
  • the balance between the liquid film cleaving action and the liquid flow suppressing action is It is determined by the area ratio of the containing part 6.
  • the containing part 6 and the non-containing part 7 can be mixed and arranged in various patterns without being limited to the pattern of FIG. 3, and the planar shapes of the containing part 6 and the non-containing part 7 are also It can take a variety of shapes.
  • planar shape of the containing part 6 and the non-containing part 7 examples include, in addition to the circular shape described above, a shape of various figures such as a rectangle, a broken line having a predetermined width, a wavy line, and a curved line. It is done. Moreover, you may make it the whole become a geometric pattern etc. by the arrangement
  • FIG. 4A for example, as shown in FIG. 4A, in the region 18 where the liquid film cleaving agent-containing part 6 and the non-containing part 7 are mixed and arranged on the surface sheet 1, the lattice-like non-containing part 7 is formed on the nonwoven fabric surface.
  • a pattern in which a plurality of non-containing parts 7 shaped like rhombuses are arranged in the lattice-shaped containing part 6 in the mixed arrangement region 18 is arranged apart from each other.
  • the containing parts 6 may be arranged in a wavy line so as to be spaced apart from each other, and the non-containing part 7 may be provided between the containing parts 6.
  • the containing part 6 may be arranged as a plurality of elliptical shapes having different sizes, arranged concentrically and spaced apart from each other, and the non-containing part 7 may be provided between the containing parts 6.
  • sequence which replaced the containing part 6 and the non-containing part 7 in these forms may be sufficient.
  • the containing part 6 may be made of a plurality of lines having a geometric shape
  • the space between the containing parts 6 may be a non-containing part
  • the non-containing part 7 may be made of a plurality of lines having a geometric shape
  • Between 7 may be the containing portion 6.
  • positioning part 6 and the non-containing part 7 of the surface sheet 1 are mixed arrangement
  • a plurality of directions on the surface of the region 18 may be provided, or one direction may be provided.
  • the arrangement in a plurality of intersecting directions is preferable.
  • the arrangement direction includes at least the longitudinal direction and the width direction from the viewpoint of enhancing the liquid leakage prevention (leakproof property) of the sanitary napkin 10. Specific examples shown in FIGS.
  • both the containing part 6 and the non-containing part 7 extend in a strip shape in the vertical direction, and the strip-like containing part 6 and the non-containing part 7 are alternately arranged in the width direction.
  • the bands of the containing part 6 and the non-containing part 7 extending in the width direction are alternately arranged in the vertical direction.
  • the arrangement in which the bands of the containing part 6 and the non-containing part 7 are extended in the vertical direction is the same as that of the containing part 6 and the non-containing part 7 as shown in FIG. This is more preferable than the arrangement in which the bands are extended in the width direction.
  • sequence of the circular containing part 6 like the excretion opening opposing part 11 shown in FIG. 3 it is preferable to have an arrangement
  • the length of the containing part 6 on the virtual line is preferably shorter than the length of the non-containing part 7.
  • the lengths of the adjacent containing parts 6 and non-containing parts 7 are compared.
  • it is preferable that a virtual line is drawn in the position where the length of the non-containing part 7 becomes the longest.
  • FIG. 6A is a partially enlarged view of the arrangement of FIG.
  • the length S1 of the non-containing part 7 in the width direction is the length of the containing part 6 in the width direction. It is preferably longer than S2 (S1> S2). Accordingly, it is preferable that the region in the width direction of the liquid film cleaving agent containing portion 6 that can be a factor of the liquid flow is moderately suppressed, and the liquid flow can be prevented from being stably generated.
  • the length of the width direction of the containing part 6 here is a diameter of a circle.
  • the length in the width direction of the non-containing portion 7 is a length obtained by subtracting the diameter of the circle from the pitch between the circular containing portions 6 on the virtual line T.
  • FIG. 6B shows a form in which the containing portion 6 has an elliptical shape.
  • the length S1 of the non-containing part 7 in the width direction is It is preferably longer than the length S2 in the width direction (S1> S2).
  • the imaginary line T is drawn so as to pass through the center of the ellipse of the containing part 6, and the length in the width direction of the containing part 6 is the width passing through the center of the ellipse on the imaginary line T.
  • the length in the width direction of the non-containing part 7 is a length obtained by subtracting the diameter of the circle from the pitch between the elliptical containing parts 6 on the virtual line T.
  • FIG. 6C is a partially enlarged view of the arrangement in which the band-shaped containing part 6 and the non-containing part 7 shown in FIG. 5A are extended in the longitudinal direction. In this case, a virtual line T along the width direction is drawn at an arbitrary position in the longitudinal direction.
  • FIG. 6 (D) is a partially enlarged view of the lattice-shaped arrangement shown in FIG. 4 (B) in which a plurality of non-contained portions 7 shaped like rhombuses are arranged apart from each other in the lattice-shaped inclusion portions 6.
  • the imaginary line T is drawn so as to pass through the intersection of the containing parts 6. That is, the imaginary line T is drawn at a position where the length in the width direction of the non-containing part 7 is the longest.
  • the length (band length) S1 of the non-containing portion 7 is longer than the length (band length) S2 of the containing portion 6 (S1> S2).
  • the ratio (S2 / S1) of the length (S2) of the containing portion 6 on the imaginary line to the length (S1) of the non-containing portion 7 is preferably 1/1 or less from the viewpoint of liquid flow prevention properties. 2/3 or less is more preferable, and 3/7 or less is still more preferable. Further, the ratio (S2 / S1) of the length (S2) of the containing part 6 on the imaginary line to the length (S1) of the non-containing part 7 is the ratio in the non-containing part 7 due to macro expansion of the liquid film cleaving agent. From the viewpoint of reducing the remaining liquid, 1/19 or more is preferable, 1/9 or more is more preferable, and 1/4 or more is still more preferable.
  • the difference between the contact angle of the constituent fibers of the containing part 6 and the contact angle of the constituent fibers of the non-containing part 7 is less likely to form a liquid film when the contact angle of the constituent fibers of the containing part 6 is higher than that of the non-containing part 7. Therefore, from the viewpoint of liquid film formation inhibition, 5 degrees or more is preferable, 10 degrees or more is more preferable, and 20 degrees or more is more preferable. Further, the difference in the contact angle is preferably 60 degrees or less, more preferably 50 degrees or less, and further preferably 40 degrees or less, from the viewpoint of easy maintenance of the generated waveform. In addition, said contact angle can be measured by the method mentioned later.
  • the contact angle of the constituent fibers of the non-containing part 7 is preferably 90 degrees or less, more preferably 80 degrees or less, and still more preferably 70 degrees or less. Thereby, the wettability of the fiber surface is moderately imparted, the liquid easily enters between the fibers, the liquid flow is easily suppressed, the wetted area increases, and the liquid film cleaving agent is easily transferred to the liquid film. Further, the contact angle of the constituent fibers of the containing portion 6 is preferably 110 degrees or less, more preferably 90 degrees or less, and still more preferably 80 degrees or less. Thereby, the slipperiness
  • the above contact angle can be measured by the following method. That is, a fiber is taken out from a predetermined portion of the nonwoven fabric constituting the surface sheet 1, and the contact angle of water with the fiber is measured.
  • a measuring device an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. is used. Deionized water is used to measure the contact angle. The measurement is performed at a temperature of 25 degrees and a relative humidity (RH) of 65%.
  • the amount of liquid ejected from an ink jet type water droplet ejection part (manufactured by Cluster Technology Co., Ltd., pulse injector CTC-25 having a pore diameter of 25 ⁇ m) is set to 20 picoliters, and a water droplet is dropped just above the fiber.
  • the state of dripping is recorded on a high-speed recording device connected to a horizontally installed camera.
  • the recording device is preferably a personal computer incorporating a high-speed capture device from the viewpoint of image analysis or image analysis later. In this measurement, an image is recorded every 17 msec.
  • the first image of water drops on the fiber taken out from the non-woven fabric is attached to the attached software FAMAS (software version is 2.6.2, analysis method is droplet method, analysis method is ⁇ / 2 method)
  • the image processing algorithm is non-reflective, the image processing image mode is frame, the threshold level is 200, and the curvature is not corrected).
  • liquid film cleaving agent contained in the nonwoven fabric constituting the surface sheet 1 of the sanitary napkin 10 will be described.
  • the liquid film cleaving agent of the first embodiment has an expansion coefficient of 15 mN / m or more and a water solubility of 0 g or more and 0.025 g or less for a liquid having a surface tension of 50 mN / m.
  • the compound which has the property of the liquid film cleaving agent of 1st Embodiment may be called compound C1.
  • the “expansion coefficient with respect to a liquid having a surface tension of 50 mN / m” possessed by the liquid film cleaving agent refers to an expansion coefficient with respect to a liquid assuming the above-mentioned excretion liquid such as menstrual blood or urine.
  • the “expansion coefficient” is a value obtained from a measurement value obtained by a measurement method described later in an environment region at a temperature of 25 ° C. and a relative humidity (RH) of 65% based on the following formula (1).
  • the liquid film in Formula (1) means a liquid phase of “a liquid having a surface tension of 50 mN / m”, and is a liquid in a state where a film is stretched between fibers or on a fiber surface, Includes both, also simply called liquid.
  • the surface tension in the formula (1) means an interfacial tension at the interface between the liquid film and the liquid film cleaving agent with the gas phase, and is distinct from the interfacial tension between the liquid phase and the liquid film cleaving agent. To do. This distinction applies to other descriptions in the present specification.
  • the expansion coefficient (S) of the liquid film cleaving agent increases as the surface tension ( ⁇ o ) of the liquid film cleaving agent decreases, and the interfacial tension of the liquid film cleaving agent with the liquid film It increases as ( ⁇ wo ) decreases.
  • the expansion coefficient is 15 mN / m or more, the liquid film cleaving agent has high mobility on the surface of the liquid film generated in a narrow region between fibers, that is, high diffusibility.
  • the expansion coefficient of the liquid film cleaving agent is more preferably 20 mN / m or more, further preferably 25 mN / m or more, and particularly preferably 30 mN / m or more.
  • the upper limit is not particularly limited, but when a liquid having a surface tension of 50 mN / m is used according to Equation (1), a liquid having an upper limit of 50 mN / m and a surface tension of 60 mN / m was used. In this case, when a liquid having an upper limit of 60 mN / m and a surface tension of 70 mN / m is used, the surface tension of the liquid forming the liquid film becomes an upper limit, such as 70 mN / m. Therefore, in the present invention, from the viewpoint of using a liquid having a surface tension of 50 mN / m, it is 50 mN / m or less.
  • the “water solubility” of the liquid film cleaving agent is a dissolvable mass (g) of the liquid film cleaving agent with respect to 100 g of deionized water. Based on the measurement method described later, the temperature is 25 ° C. and the relative humidity (RH) is 65. It is a value measured in the environmental area of%. When the water solubility is 0 g or more and 0.025 g or less, the liquid film cleaving agent is difficult to dissolve and forms an interface with the liquid film, thereby making the diffusibility more effective.
  • the water solubility of the liquid film cleaving agent is preferably 0.0025 g or less, more preferably 0.0017 g or less, and still more preferably less than 0.0001 g. Further, the water solubility is preferably as small as possible, and is 0 g or more. From the viewpoint of diffusibility into the liquid film, it is practical to set the water solubility to 1.0 ⁇ 10 ⁇ 9 g or more. In addition, it is thought that said water solubility is applicable also to the menstrual blood, urine, etc. which have a water
  • the surface tension ( ⁇ w ) of the liquid film (liquid having a surface tension of 50 mN / m), the surface tension ( ⁇ o ) of the liquid film cleaving agent, and the interfacial tension of the liquid film cleaving agent ( ⁇ wo )
  • the water solubility of the liquid film cleaving agent is measured by the following method.
  • the surface sheet 1 to be measured is in a state of being incorporated in the sanitary napkin 10, it is taken out and measured as follows. That is, in the sanitary napkin 10, after the adhesive used for joining the member to be measured and other members is weakened by a cooling means such as cold spray, the member to be measured is carefully peeled off and taken out.
  • This extraction method is applied in the measurement according to the nonwoven fabric of the present invention, such as measurement of the interfiber distance and the fineness described later.
  • a washing liquid such as hexane, methanol, ethanol, and the solvent used for the washing (including the liquid film cleaving agent).
  • the washing solvent is dried and removed.
  • the mass of the substance taken out at this time is applied when calculating the content ratio (OPU) with respect to the fiber mass of the liquid film cleaving agent.
  • the amount of the extracted material is too small to measure the surface tension or interfacial tension, select an appropriate column and solvent according to the composition of the extracted material, and then fractionate each component by high performance liquid chromatography. Furthermore, the structure of each fraction is identified by performing MS measurement, NMR measurement, elemental analysis and the like for each fraction.
  • the liquid film cleaving agent contains a polymer compound, it becomes easier to identify the constituents by using a technique such as gel permeation chromatography (GPC) together. If the substance is a commercial product, it is procured, and if it is not a commercial product, a sufficient amount is obtained by synthesis, and the surface tension and interfacial tension are measured.
  • GPC gel permeation chromatography
  • the liquid film cleaving agent obtained as described above is a solid
  • the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid. Perform measurement under the same conditions.
  • Measurement method of surface tension ( ⁇ w ) of liquid film (liquid) Measurement can be performed using a platinum plate by the plate method (Wilhelmy method) in an environmental region at a temperature of 25 ° C. and a relative humidity (RH) of 65%.
  • a measuring device at that time an automatic surface tension meter “CBVP-Z” (trade name, manufactured by Kyowa Interface Science Co., Ltd.) can be used.
  • a platinum plate having a purity of 99.9%, a size of 25 mm in width, and 10 mm in length is used.
  • liquid having a surface tension of 50 mN / m is a polyoxyethylene sorbitan monolaur, which is a nonionic surfactant, in deionized water using the above measurement method.
  • a solution adjusted to a surface tension of 50 ⁇ 1 mN / m by adding a rate (for example, trade name Leool Super TW-L120 manufactured by Kao Corporation) is used.
  • the interfacial tension when the drop is formed (at 0 second) is read.
  • the liquid film cleaving agent is heated to the melting point of the liquid film cleaving agent + 5 ° C. to cause a phase transition to the liquid, and the measurement is performed with the temperature condition.
  • the measurement is performed with the temperature condition.
  • the interfacial tension if the density difference between the liquid film cleaving agent and the liquid with a surface tension of 50 mN / m is very small, the viscosity is extremely high, or the interfacial tension value is below the pendant drop measurement limit, The interfacial tension measurement by the pendant drop method may be difficult.
  • the measurement can be performed by measuring by a spinning drop method in an environment region at a temperature of 25 ° C. and a relative humidity (RH) of 65%.
  • a spinning drop interfacial tensiometer manufactured by KRUSS, trade name SITE100
  • the interfacial tension when the drop shape is stabilized is read, and when the obtained liquid film cleaving agent is solid, it is heated to the melting point of the liquid film cleaving agent + 5 ° C. The phase is changed and the measurement is carried out with the temperature condition. Note that if the interfacial tension can be measured by both measuring devices, a smaller interfacial tension value is adopted as the measurement result.
  • dissolution means both monodisperse dissolution and micelle dispersion dissolution, and the amount of dissolution when floating, precipitation, precipitation, or cloudiness is observed is the water solubility. It becomes.
  • the liquid film cleaving agent of the present embodiment has the above expansion coefficient and water solubility, so that it spreads without dissolving on the surface of the liquid film and can displace the liquid film layer from the vicinity of the center of the liquid film. it can. As a result, the liquid film is destabilized and cleaved.
  • action in the nonwoven fabric which comprises the surface sheet of the liquid film cleaving agent of this embodiment is demonstrated concretely with reference to FIG.
  • a highly viscous liquid such as menstrual blood or excretory liquid such as urine tends to stretch the liquid film 2.
  • the liquid film cleaving agent destabilizes and breaks the liquid film in the following manner, inhibits formation, and promotes drainage from the nonwoven fabric.
  • the liquid film cleaving agent 3 included in the nonwoven fiber 1 moves on the surface of the liquid film 2 while maintaining the interface with the liquid film 2.
  • FIGS. 8A1 and 8B1 the liquid film cleaving agent 3 included in the nonwoven fiber 1 moves on the surface of the liquid film 2 while maintaining the interface with the liquid film 2.
  • the liquid film cleaving agent 3 pushes away a part of the liquid film 2 and penetrates in the thickness direction, as shown in FIGS. 8A3 and 8B3.
  • the liquid film 2 is gradually changed to a non-uniform and thin film.
  • the liquid film 2 is opened and cleaved so as to be repelled.
  • the cleaved menstrual fluid or the like becomes droplets and easily passes between the fibers of the nonwoven fabric, and the remaining liquid is reduced.
  • action with respect to the liquid film of said liquid film cleaving agent is similarly demonstrated not only to the case with respect to the liquid film between fibers but with respect to the liquid film clinging to the fiber surface. That is, the liquid film cleaving agent can move over the liquid film clinging to the fiber surface and push away a part of the liquid film to cleave the liquid film. In addition, the liquid film cleaving agent can cleave the liquid film with respect to the liquid film clinging to the fiber surface without moving at the position attached to the fiber, and can inhibit the formation of the liquid film.
  • the liquid film cleaving agent according to the present invention does not perform liquid modification such as lowering the surface tension of the liquid film, but cleaves and inhibits the liquid film itself generated between the fibers or on the fiber surface.
  • liquid modification such as lowering the surface tension of the liquid film
  • the liquid residue of a nonwoven fabric can be reduced.
  • the surface sheet which consists of such a nonwoven fabric is integrated in an absorbent article, the retention of the liquid between fibers is suppressed and the liquid permeation
  • the liquid film cleaving agent preferably further has an interface tension of 20 mN / m or less with respect to a liquid having a surface tension of 50 mN / m. That is, it is preferable that the “interfacial tension ( ⁇ wo ) of the liquid film cleaving agent with respect to the liquid film”, which is one variable for determining the value of the expansion coefficient (S) in the above-described mathematical formula (1), is 20 mN / m or less.
  • the “interfacial tension with respect to a liquid having a surface tension of 50 mN / m” of the liquid film cleaving agent is more preferably 17 mN / m or less, further preferably 13 mN / m or less, still more preferably 10 mN / m or less, and 9 mN.
  • the lower limit is not particularly limited, and may be larger than 0 mN / m from the viewpoint of insolubility in the liquid film. Note that when the interfacial tension is 0 mN / m, that is, when dissolved, an interface between the liquid film and the liquid film cleaving agent cannot be formed, so Equation (1) does not hold and the agent does not expand. As can be seen from the mathematical expression, the expansion coefficient changes depending on the surface tension of the target liquid.
  • the expansion coefficient is 50.8 mN / m.
  • the surface tension of the target liquid is 30 mN / m
  • the surface tension of the liquid film cleaving agent is 21 mN / m
  • the interfacial tension is 0.2 mN / m
  • the expansion coefficient is 8.8 mN / m.
  • the larger the expansion coefficient the greater the liquid film cleavage effect.
  • the numerical value at the surface tension of 50 mN / m is defined.
  • the surface tension of the liquid film cleaving agent is preferably 32 mN / m or less, more preferably 30 mN / m or less, still more preferably 25 mN / m or less, and particularly preferably 22 mN / m or less. Moreover, the said surface tension is so good that it is small, and the minimum is not specifically limited. From the viewpoint of durability of the liquid film cleaving agent, 1 mN / m or more is practical. By setting the surface tension of the liquid film cleaving agent to be in the above range or less, even when the surface tension of the target liquid that stretches the liquid film is lowered, the liquid film cleaving action can be effectively exhibited.
  • the liquid film cleaving agent of the second embodiment has an expansion coefficient larger than 0 mN / m for a liquid having a surface tension of 50 mN / m, that is, a positive value, a water solubility of 0 g or more and 0.025 g or less, and a surface tension.
  • the interfacial tension with respect to a liquid of 50 mN / m is 20 mN / m or less.
  • the compound having the properties of the liquid film cleaving agent of the second embodiment may be referred to as compound C2.
  • the nonwoven fabric of 2nd embodiment contains the said liquid film cleaving agent.
  • the “interfacial tension with respect to a liquid having a surface tension of 50 mN / m” is 20 mN / m or less, it means that the diffusibility of the liquid film cleaving agent on the liquid film is increased as described above.
  • the expansion coefficient is relatively small such that the “expansion coefficient for a liquid having a surface tension of 50 mN / m” is less than 15 mN / m, many liquid film cleaving agents are removed from the fiber surface due to high diffusibility.
  • extension coefficient for a liquid having a surface tension of 50 mN / m is defined in the first embodiment.
  • the measuring method is also the same.
  • the “interfacial tension with respect to a liquid having a surface tension of 50 mN / m” is preferably 17 mN / m or less, and 13 mN / m or less. Is more preferably 10 mN / m or less, still more preferably 9 mN / m or less, and particularly preferably 1 mN / m or less.
  • the lower limit is not particularly limited as in the first embodiment, and is practically larger than 0 mN / m from the viewpoint of not dissolving in a liquid film (a liquid having a surface tension of 50 mN / m). .
  • the “expansion coefficient for a liquid having a surface tension of 50 mN / m” is preferably 9 mN / m or more, more preferably 10 mN / m or more from the viewpoint of making the action of the liquid film cleaving agent more effective. More preferably, it is 15 mN / m or more.
  • the upper limit in particular is not restrict
  • the surface sheet containing the liquid film cleaving agent of the first embodiment and the surface sheet containing the liquid film cleaving agent of the second embodiment further contain a phosphate ester type anionic surfactant.
  • a phosphate ester type anionic surfactant As a result, the hydrophilicity of the fiber surface is increased and the wettability is improved, so that the area where the liquid film and the liquid film cleaving agent are in contact with each other is increased, and blood and urine are surface-active having a phosphate group derived from a living body.
  • the content ratio of the liquid membrane cleaving agent to the phosphate ester type anionic surfactant is preferably 1: 1 to 19: 1 by mass ratio (liquid membrane cleaving agent: phosphate ester type anionic surfactant), 2: 1 to 15: 1 is more preferable, and 3: 1 to 10: 1 is still more preferable.
  • the content ratio is preferably 5: 1 to 19: 1, more preferably 8: 1 to 16: 1, and even more preferably 11: 1 to 13: 1 in terms of mass ratio.
  • the phosphate ester type anionic surfactant is not particularly limited.
  • specific examples thereof include alkyl ether phosphates, dialkyl phosphates, and alkyl phosphates.
  • alkyl phosphate ester is preferable from the viewpoint of enhancing the affinity with the liquid film and at the same time imparting the workability of the nonwoven fabric forming the topsheet 1.
  • alkyl ether phosphates can be used without particular limitation.
  • polyoxyalkylene stearyl ether phosphate examples include unsaturated carbon chains such as oxyalkylene oleyl ether phosphates and polyoxyalkylene palmitoleyl ether phosphates, and those having side chains in these carbon chains. More preferably, it is a completely neutralized or partially neutralized salt of a mono- or dipolyoxyalkylene alkyl ether phosphate ester having 16 to 18 carbon chains.
  • Examples of the polyoxyalkylene include polyoxyethylene, polyoxypropylene, polyoxybutylene and those obtained by copolymerizing these constituent monomers.
  • Examples of the salt of alkyl ether phosphate include alkali metals such as sodium and potassium, ammonia, and various amines. Alkyl ether phosphates can be used singly or in combination of two or more. Specific examples of the alkyl phosphate ester include those having a saturated carbon chain such as stearyl phosphate ester, myristyl phosphate ester, lauryl phosphate ester, palmityl phosphate ester, oleyl phosphate ester, palmitoleyl phosphate ester, etc.
  • Examples include unsaturated carbon chains and those having side chains in these carbon chains. More preferably, it is a completely neutralized or partially neutralized salt of a mono- or dialkyl phosphate ester having 16 to 18 carbon chains.
  • alkyl phosphate ester salt include alkali metals such as sodium and potassium, ammonia, and various amines.
  • Alkyl phosphate ester can be used individually by 1 type or in mixture of 2 or more types.
  • liquid film cleaving agent in the first embodiment and the second embodiment will be described. These are not soluble in water or have poor water-solubility because they are in the specific numerical range described above, and act to cleave the liquid film.
  • surfactants used as conventional fiber treatment agents are practically water-soluble, which are practically dissolved in water and used in the liquid film cleaving agent according to the present invention. Absent.
  • the liquid film cleaving agent in the first embodiment and the second embodiment is preferably a compound having a mass average molecular weight of 500 or more. This mass average molecular weight greatly affects the viscosity of the liquid film cleaving agent.
  • the liquid film cleaving agent keeps the viscosity high so that it does not easily flow off when the liquid passes between the fibers, and the liquid film cleaving effect in the nonwoven fabric forming the top sheet 1 can be maintained.
  • the mass average molecular weight of the liquid film cleavage agent is more preferably 1000 or more, further preferably 1500 or more, and particularly preferably 2000 or more.
  • the mass average molecular weight is measured using a gel permeation chromatograph (GPC) “CCPD” (trade name, manufactured by Tosoh Corporation). The measurement conditions are as follows. The calculated molecular weight is calculated with polystyrene. Separation column: GMHHR-H + GMHHR-H (cation) Eluent: L Farmin DM20 / CHCl3 Solvent flow rate: 1.0 ml / min Separation column temperature: 40 ° C
  • the liquid film cleaving agent in the first embodiment is preferably a compound having at least one structure selected from the group consisting of the following structures X, XY, and YXY, as described later.
  • Structure X is> C (A)- ⁇ C represents a carbon atom. ⁇ ,>, And-indicate a bond. The same applies hereinafter.
  • a hydrogen atom or —C (A) 3 , —C (A) 2 B, —C (A) (B) 2, —C (A) 2 —C (R 1 ) 3 , -C (R 1 ) 2 A, -C (R 1 ) 3 , -OSi (R 1 ) 3 , -OSi (R 1 ) 2 (R 2 ), -Si (R 1 ) 3 , -Si (R 1 ) 2 It has at least one group selected from the group consisting of (R 2 ).
  • R 1 and R 2 are each independently a hydrogen atom, an alkyl group (preferably having a carbon number of 1 to 20, preferably a methyl group, an ethyl group or a propyl group), an alkoxy group (having a carbon number of 1 to 20).
  • Preferred examples include various substituents such as a methoxy group and an ethoxy group, an aryl group (preferably having 6 to 20 carbon atoms, eg a phenyl group), and a halogen atom (eg a fluorine atom is preferred). Show.
  • a and B each independently represent a substituent containing an oxygen atom or a nitrogen atom, such as a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, or a phenol group.
  • R 1 , R 2 , A, and B in the structure X may be the same as or different from each other.
  • a continuous bond between C (carbon atom) and Si is usually a single bond, but may include a double bond or a triple bond, and the bond between C and Si includes an ether group (- O-), amide group (—CONR A —: R A is a hydrogen atom or a monovalent group), ester group (—COO—), carbonyl group (—CO—), carbonate group (—OCOO—), etc. Groups may be included.
  • the number of one C and Si bonded to the other C or Si is 1 to 4, and a long-chain silicone chain (siloxane chain) or mixed chain is branched or has a radial structure. There may be cases.
  • Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom.
  • a polyoxyethylene (POE) group a polyoxyalkylene group, Propylene (POP) group is preferred
  • POP polyoxyethylene
  • sulfonic acid group sulfuric acid group
  • phosphoric acid group a polyoxyalkylene group
  • sulfobetaine group a polyoxyalkylene group
  • carbobetaine group a polyoxyalkylene group
  • phosphobetaine group a hydrophilic group
  • Y is plural, they may be the same or different. In structures XY and YXY, Y is attached to X or a terminal group of X.
  • the terminal group of X is bonded to Y by removing, for example, the same number of hydrogen atoms as the number of bonds to Y.
  • the hydrophilic groups Y, A, and B can be selected from the groups specifically described to satisfy the aforementioned expansion coefficient, water solubility, and interfacial tension.
  • the target liquid film cleavage effect is expressed.
  • the liquid film cleaving agent is preferably a compound in which the structure X is a siloxane structure. Furthermore, in the liquid film cleaving agent, as specific examples of the structures X, XY, and YXY, the structures represented by the following formulas (1) to (11) are arbitrarily combined from a siloxane chain. Is preferred. Furthermore, it is preferable from the viewpoint of the liquid film cleaving action that this compound has a mass average molecular weight in the above-mentioned range.
  • M 1 , L 1 , R 21 , and R 22 represent the following monovalent or polyvalent (divalent or higher) groups.
  • R 23 and R 24 represent the following monovalent or polyvalent (divalent or higher) group or a single bond.
  • M 1 is a group having a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them, an erythritol group, a xylitol group, a sorbitol group, a glycerin group or an ethylene glycol group.
  • Hydrophilic groups having a plurality of hydroxyl groups hydrophilic groups formed by removing one hydrogen atom from the above compound having a plurality of hydroxyl groups such as erythritol), hydroxyl groups, carboxylic acid groups, mercapto groups, alkoxy groups (preferably having 1 to 20 carbon atoms) For example, a methoxy group is preferred), amino group, amide group, imino group, phenol group, sulfonic acid group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetaine group, phosphobetaine group, imidazolium betaine group, carbobetaine.
  • M 1 is a polyvalent group
  • M 1 represents a group obtained by removing one or more hydrogen atoms from each of the above groups or functional groups.
  • L 1 is an ether group, an amino group (an amino group that can be taken as L 1 is represented by> NR C (R C is a hydrogen atom or a monovalent group)), an amide group, an ester group, a carbonyl group, The bonding group of a carbonate group is shown.
  • R 21 , R 22 , R 23 , and R 24 are each independently an alkyl group (preferably having 1 to 20 carbon atoms.
  • methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group) Group, heptyl group, 2-ethylhexyl group, nonyl group and decyl group are preferred
  • alkoxy group preferably having 1 to 20 carbon atoms, for example, preferably methoxy group and ethoxy group
  • aryl group having 6 to 6 carbon atoms.
  • R 20 is preferable, for example, a phenyl group is preferable), a fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or a halogen atom (for example, a fluorine atom is preferable).
  • R ⁇ 22 > and R ⁇ 23 > are polyvalent groups
  • examples of the group that can be taken as R 22 or R 23 include an imino group that can be taken as R 32 in addition to the above groups, the hydrocarbon group, or the halogen atom. It is done.
  • the liquid film cleaving agent has a structure represented by any one of formulas (1), (2), (5) and (10) as X, and the end of X or the end of X and Y
  • a compound having a structure represented by any one of the above formulas other than these formulas is preferable.
  • X or a group consisting of X terminal and Y has a structure represented by any of the above formulas (2), (4), (5), (6), (8) and (9).
  • a compound composed of a siloxane chain having at least one is preferable.
  • organic surfactants that are silicone surfactants.
  • examples of the organic modified silicone modified with a reactive organic group include amino modified, epoxy modified, carboxy modified, diol modified, carbinol modified, (meth) acryl modified, mercapto modified, and phenol modified.
  • Organic modified silicones modified with non-reactive organic groups include polyether modified (including polyoxyalkylene modified), methylstyryl modified, long chain alkyl modified, higher fatty acid ester modified, higher alkoxy modified, higher fatty acid. Examples include modified and fluorine-modified ones.
  • the expansion coefficient exhibiting the above-mentioned liquid film cleavage action can be obtained.
  • long chain refers to those having 12 or more carbon atoms, preferably those having 12 to 20 carbon atoms.
  • “higher” means one having 6 or more carbon atoms, preferably 6 to 20 carbon atoms.
  • a modified silicone having a structure in which a liquid film cleaving agent that is a modified silicone has at least one oxygen atom in a modified group such as polyoxyalkylene-modified silicone, epoxy-modified silicone, carbinol-modified silicone, and diol-modified silicone is preferable.
  • polyoxyalkylene-modified silicone is preferred. Since the polyoxyalkylene-modified silicone has a polysiloxane chain, it hardly penetrates into the inside of the fiber and tends to remain on the surface.
  • the addition of a hydrophilic polyoxyalkylene chain is preferable because the affinity with water is increased and the interfacial tension is low, so that the movement on the surface of the liquid film is likely to occur.
  • the movement on the surface of the liquid film described above easily occurs.
  • the polyoxyalkylene-modified silicone is subjected to hot melt processing such as embossing, it tends to remain on the fiber surface at that portion, and the liquid film cleavage action is difficult to reduce.
  • the liquid film cleaving action is sufficiently exhibited at the embossed portion where the liquid tends to accumulate, which is preferable.
  • polyoxyalkylene-modified silicone examples include those represented by the following formulas [I] to [IV]. Furthermore, the polyoxyalkylene-modified silicone preferably has a mass average molecular weight within the above-mentioned range from the viewpoint of the liquid film cleavage action.
  • R 31 is an alkyl group (preferably having 1 to 20 carbon atoms. For example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2-ethyl-hexyl group, Nonyl group and decyl group are preferred).
  • R 32 represents a single bond or an alkylene group (preferably having a carbon number of 1 to 20, for example, a methylene group, an ethylene group, a propylene group or a butylene group is preferred), and preferably represents the alkylene group.
  • the plurality of R 31 and the plurality of R 32 may be the same as or different from each other.
  • M 11 represents a group having a polyoxyalkylene group, and a polyoxyalkylene group is preferable.
  • the polyoxyalkylene group include a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a copolymer of these constituent monomers.
  • m and n are each independently an integer of 1 or more. The symbols of these repeating units are determined separately in each of the formulas (I) to (IV), and do not necessarily indicate the same integer and may be different.
  • the polyoxyalkylene-modified silicone may have one or both modified groups of polyoxyethylene-modified and polyoxypropylene-modified.
  • a methyl group in the alkyl group R 31 of the silicone chain is not particularly limited, and examples thereof include those described in paragraphs [0006] and [0012] of JP-A No. 2002-161474. More specifically, polyoxyethylene (POE) polyoxypropylene (POP) modified silicone, polyoxyethylene (POE) modified silicone, polyoxypropylene (POP) modified silicone and the like can be mentioned.
  • Examples of the POE-modified silicone include POE (3) -modified dimethyl silicone added with 3 moles of POE.
  • Examples of the POP-modified silicone include POP (10) -modified dimethyl silicone, POP (12) -modified dimethyl silicone, POP (24) -modified dimethyl silicone to which POP is added at 10 mol, 12 mol, or 24 mol.
  • the expansion coefficient and water solubility of the first embodiment described above are, for example, the number of added moles of a polyoxyalkylene group (an oxyalkylene group that forms a polyoxyalkylene group with respect to 1 mole of the polyoxyalkylene-modified silicone). ), The following modification rate, and the like.
  • the surface tension and the interfacial tension can also be set within predetermined ranges in the same manner. From the above viewpoint, those having an addition mole number of the polyoxyalkylene group of 1 or more are preferable.
  • the number of added moles is more preferably 3 or more, and further preferably 5 or more.
  • the number of added moles is preferably 30 or less, more preferably 20 or less, and still more preferably 10 or less. If the modification rate of the modified silicone is too low, the hydrophilicity is impaired, so that it is preferably 5% or more, more preferably 10% or more, and even more preferably 20% or more.
  • the modification rate of the modified silicone is the ratio of the number of repeating units of the modified siloxane bonding portion to the total number of repeating units of the siloxane bonding portion in one molecule of the modified silicone. For example, (n / m + n) ⁇ 100% in the above formulas [I] and [IV], (2 / m) ⁇ 100% in the formula [II], and (1 / m) in the formula [III]. ⁇ 100%.
  • the modified groups are water-soluble polyoxyethylene groups, water-insoluble polyoxypropylene groups, and polyoxybutylene groups, respectively.
  • the molecular weight of the water-insoluble silicone chain By changing the molecular weight of the water-insoluble silicone chain, introducing an amino group, an epoxy group, a carboxy group, a hydroxyl group, a carbinol group, etc. in addition to the polyoxyalkylene modification as the modifying group, etc. Can be set within the range.
  • the polyalkylene-modified silicone used as the liquid film cleaving agent is preferably contained in an amount of 0.02% by mass to 5% by mass with respect to the fiber mass (Oil Per Unit).
  • the content (OPU) of the polyalkylene-modified silicone is more preferably 1% by mass or less, and further preferably 0.4% by mass or less. By doing so, the tactile sensation of the topsheet 1 becomes preferable.
  • the content ratio (OPU) is more preferably 0.04% by mass or more, and further preferably 0.1% by mass or more.
  • the fiber mass here means the fiber mass of the whole nonwoven fabric containing the containing part 6 and the non-containing part 7 (it is the same also in the content rate (OPU) demonstrated below).
  • the liquid film cleaving agent in the second embodiment is preferably a compound having at least one structure selected from the group consisting of the following structures Z, ZY, and YZY, as will be described later.
  • the structure Z includes:> C (A)- ⁇ C: carbon atom>, -C (A) 2- , -C (A) (B)-,> C (A) -C (R 3 ) ⁇ ,> C Any basic structure of (R 3 ) —, —C (R 3 ) (R 4 ) —, —C (R 3 ) 2 —,> C ⁇ is repeated, or two or more are combined Represents a hydrocarbon chain of structure.
  • R 3 and R 4 are each independently a hydrogen atom or an alkyl group (preferably having 1 to 20 carbon atoms.
  • methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl Group, 2-ethyl-hexyl group, nonyl group and decyl group are preferable
  • alkoxy group preferably having 1 to 20 carbon atoms, for example, methoxy group and ethoxy group are preferable
  • aryl group having 6 to 20 carbon atoms.
  • Preferred examples thereof include a phenyl group.
  • a and B each independently represent a substituent containing an oxygen atom or a nitrogen atom, such as a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, or a phenol group.
  • R 3 , R 4 , A, and B in the structure Z they may be the same as or different from each other.
  • the bond between successive C (carbon atoms) is usually a single bond, but may include a double bond or a triple bond, and the bond between C includes an ether group, an amide group, an ester group.
  • a linking group such as a carbonyl group or a carbonate group may be included.
  • Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom.
  • a hydroxyl group, a carboxylic acid group, an amino group, an amide group, an imino group, a phenol group; or a polyoxyalkylene group (the oxyalkylene group preferably has 1 to 4 carbon atoms.
  • a hydrophilic group such as a sulfonic acid group, a sulfuric acid group, a phosphoric acid group, a sulfobetaine group, a carbobetaine group, a phosphobetaine group, a quaternary ammonium group, an imidazolium betaine group, an epoxy group, a carbinol group, or a methacryl group;
  • Y When Y is plural, they may be the same or different.
  • Y is bonded to Z or a terminal group of Z.
  • the terminal group of Z is bonded to Y by removing, for example, the same number of hydrogen atoms as the number of bonds to Y.
  • the hydrophilic groups Y, A, and B can be selected from the groups specifically described to satisfy the aforementioned expansion coefficient, water solubility, and interfacial tension. Thus, the target liquid film cleavage effect is expressed.
  • the liquid film cleaving agent is preferably a compound in which the structures represented by the following formulas (12) to (25) are arbitrarily combined as specific examples of the structures Z, ZY, and YZY. . Furthermore, it is preferable from the viewpoint of the liquid film cleaving action that this compound has a mass average molecular weight in the above-mentioned range.
  • M 2 , L 2 , R 41 , R 42 , and R 43 represent the following monovalent or polyvalent groups (divalent or higher).
  • M 2 is a group having a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group in combination thereof, an erythritol group, a xylitol group, a sorbitol group, a glycerin group or an ethylene glycol group.
  • Hydrophilic groups having a plurality of hydroxyl groups, hydroxyl groups, carboxylic acid groups, mercapto groups, alkoxy groups (preferably having 1 to 20 carbon atoms, preferably methoxy groups), amino groups, amide groups, imino groups, phenol groups, sulfonic acids Group, quaternary ammonium group, sulfobetaine group, hydroxysulfobetaine group, phosphobetaine group, imidazolium betaine group, carbobetaine group, epoxy group, carbinol group, (meth) acryl group, or a functional group combining them. Show.
  • L 2 is an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, or a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them.
  • the bonding group of is shown.
  • R 41 , R 42 , and R 43 are each independently a hydrogen atom or an alkyl group (preferably having 1 to 20 carbon atoms.
  • a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group) , A heptyl group, a 2-ethylhexyl group, a nonyl group and a decyl group are preferable, an alkoxy group (preferably having 1 to 20 carbon atoms, for example, a methoxy group and an ethoxy group are preferable), an aryl group (having 6 to 20 carbon atoms).
  • a phenyl group is preferable), a fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents composed of a halogen atom (for example, a fluorine atom is preferable).
  • R 42 is a polyvalent group
  • R 42 is the above-described substituent, further showing a group obtained by removing one or more hydrogen atoms.
  • another structure may be arbitrarily connected to the tip of the bond described in each structure, or a hydrogen atom may be introduced.
  • polyether compounds and nonionic surfactants can be mentioned.
  • a polyoxyalkylene glycol represented by the formula (VI) having a mass average molecular weight of 1000 or more steareth, behenez
  • PPG Examples include myristyl ether, PPG stearyl ether, and PPG behenyl ether.
  • the polyoxyalkylene alkyl ether is preferably lauryl ether to which POP is added in an amount of 3 mol to 24 mol, preferably 5 mol.
  • polypropylene glycol having a weight average molecular weight of 1000 to 10,000, preferably 3000, to which polypropylene glycol is added in an amount of 17 to 180 mol, preferably about 50 mol, is preferable.
  • the measurement of said mass mean molecular weight can be performed with the measuring method mentioned above.
  • the polyether compound and the nonionic surfactant are preferably contained in an amount of 0.1% by mass or more and 5% by mass or less as a content ratio to the fiber mass (Oil Per Unit).
  • the content ratio (OPU) of the polyether compound or nonionic surfactant is more preferably 1% by mass or less, and further preferably 0.4% by mass or less. By doing so, the tactile sensation of the top sheet 1 becomes preferable.
  • the content ratio (OPU) is more preferably 0.15% by mass or more, and further 0.2% by mass or more. preferable.
  • L 21 represents an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them
  • a linking group such as R 51 is a hydrogen atom, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2-ethylhexyl group, nonyl group, decyl group, methoxy group, ethoxy group, phenyl group , A fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents composed of a fluorine atom.
  • A, b, m and n are each independently an integer of 1 or more.
  • the number of carbon atoms and the number of hydrogen atoms are determined independently in each of the formulas (V) and (VI), and do not necessarily indicate the same integer, and may be different.
  • “m” in — (C a H b O) m — is an integer of 1 or more.
  • the value of this repeating unit is determined independently in each of the formulas (V) and (VI), and does not necessarily indicate the same integer, and may be different.
  • the expansion coefficient, surface tension, and water solubility of the second embodiment described above can be set within predetermined ranges in the polyether compound or nonionic surfactant, for example, depending on the number of moles of the polyoxyalkylene group.
  • the number of moles of the polyoxyalkylene group is preferably 1 or more and 70 or less. By setting it to 1 or more, the above-mentioned liquid film cleavage action is sufficiently exhibited. In this respect, the number of moles is more preferably 5 or more, and even more preferably 7 or more.
  • the added mole number is preferably 70 or less, more preferably 60 or less, and still more preferably 50 or less.
  • the entanglement of the molecular chain becomes moderately weak, and the diffusibility in the liquid film is excellent, which is preferable.
  • the expansion coefficient, surface tension, interfacial tension and water solubility described above are the same for water-soluble polyoxyethylene groups, water-insoluble polyoxypropylene groups and polyoxybutylene groups in polyether compounds and nonionic surfactants, respectively.
  • Use in combination change the chain length of the hydrocarbon chain, use a hydrocarbon chain having a branched chain, use a hydrocarbon chain having a double bond, benzene ring or naphthalene in the hydrocarbon chain It can be set within a predetermined range by using one having a ring or by appropriately combining the above.
  • hydrocarbon compounds having 5 or more carbon atoms can be mentioned.
  • the number of carbon atoms is preferably 100 or less, more preferably 50 or less, from the viewpoint that the liquid is more easily expanded to the liquid film surface.
  • This hydrocarbon compound excludes polyorganosiloxane, and is not limited to a straight chain, but may be a branched chain, and the chain is not particularly limited to saturated or unsaturated.
  • This hydrocarbon compound is preferably contained in an amount of 0.1% by mass or more and 5% by mass or less as a content ratio to the fiber mass (Oil Per Unit).
  • the content ratio (OPU) of the hydrocarbon compound is preferably 1% by mass or less, more preferably 0.99% by mass or less, and still more preferably 0.4% by mass or less. By doing so, the tactile sensation of the top sheet 1 becomes preferable. Further, from the viewpoint of sufficiently exhibiting the liquid film cleavage effect due to the content of the hydrocarbon compound, the content (OPU) is more preferably 0.15% by mass or more, and further preferably 0.2% by mass or more.
  • Hydrocarbon compounds include oils or fats, such as natural oils or natural fats. Specific examples include coconut oil, camellia oil, castor oil, coconut oil, corn oil, olive oil, sunflower oil, tall oil, and mixtures thereof. Moreover, the fatty acids as represented by Formula (VII), such as caprylic acid, capric acid, oleic acid, lauric acid, palmitic acid, stearic acid, myristic acid, behenic acid, and mixtures thereof, can be mentioned.
  • oils or fats such as natural oils or natural fats. Specific examples include coconut oil, camellia oil, castor oil, coconut oil, corn oil, olive oil, sunflower oil, tall oil, and mixtures thereof.
  • the fatty acids as represented by Formula (VII) such as caprylic acid, capric acid, oleic acid, lauric acid, palmitic acid, stearic acid, myristic acid, behenic acid, and mixtures thereof, can be mentioned.
  • n and n are each independently an integer of 1 or more.
  • C m H n is a hydrocarbon group of each of the above fatty acids.
  • linear or branched, saturated or unsaturated, substituted or unsubstituted polyhydric alcohol fatty acid esters or mixtures of polyhydric alcohol fatty acid esters as represented by formula (VIII-I) or (VIII-II)
  • examples thereof include glycerin fatty acid esters and pentaerythritol fatty acid esters, and specific examples include glyceryl tricaprylate, glyceryl tripalmitate, and mixtures thereof.
  • the mixture of glycerin fatty acid ester and pentaerythritol fatty acid ester typically contains some mono-, di-, and triesters.
  • glycerin fatty acid ester examples include glyceryl tricaprylate, a mixture of glyceryl tricapryate, and the like. Also, from the viewpoint of reducing the interfacial tension and obtaining a higher expansion coefficient, a polyhydric alcohol fatty acid ester having a polyoxyalkylene group introduced to such an extent that water insolubility can be maintained may be used.
  • m, m ′, m ′′, n, n ′, and n ′′ are each independently an integer of 1 or more.
  • the plurality of m and the plurality of n may be the same as or different from each other.
  • C m H n, C m 'H n' and C m '' H n '' are each a hydrocarbon group of each of the fatty acid.
  • fatty acids or fatty acid mixtures in which linear or branched, saturated or unsaturated fatty acids form esters with polyols having a large number of hydroxyl groups, and some of the hydroxyl groups remain unesterified are represented by the formula ( IX), a glycerin fatty acid ester, a sorbitan fatty acid ester, and a partially esterified product of pentaerythritol fatty acid ester represented by any one of formula (X) or formula (XI).
  • a mixture composed of partially esterified products such as glycerin fatty acid ester, sorbitan fatty acid ester, and pentaerythritol fatty acid ester typically contains some fully esterified compound.
  • m and n are each independently an integer of 1 or more.
  • the plurality of m and the plurality of n may be the same as or different from each other.
  • C m H n is a hydrocarbon group of each of the above fatty acids.
  • R 52 represents a linear or branched, saturated or unsaturated hydrocarbon group (an alkyl group, an alkenyl group, an alkynyl group, or the like) having 2 to 22 carbon atoms. Specific examples include 2-ethylhexyl group, lauryl group, myristyl group, palmityl group, stearyl group, behenyl group, oleyl group, linole group and the like.
  • m and n are each independently an integer of 1 or more.
  • the plurality of m and the plurality of n may be the same as or different from each other.
  • C m H n is a hydrocarbon group of each of the above fatty acids.
  • sterols can be mentioned.
  • Specific examples include cholesterol, sitosterol, stigmasterol, ergosterol, and mixtures thereof having a sterol structure of the formula (XII).
  • alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, and mixtures thereof as represented by formula (XIII).
  • n and n are each independently an integer of 1 or more.
  • C m H n is a hydrocarbon group of each of the above alcohol.
  • fatty acid ester examples include isopropyl myristate, isopropyl palmitate, cetylethylhexanoate, triethylhexanoin, octyldodecyl myristate, ethylhexyl palmitate, ethylhexyl stearate, butyl stearate represented by the formula (XIV). Rate, myristyl myristate, stearyl stearate, cholesteryl isostearate and mixtures thereof.
  • m and n are each independently an integer of 1 or more.
  • two C m H n may be the same or different.
  • C m H n -COO- of C m H n is a hydrocarbon group of each of the above fatty acids.
  • C m H n in —COOC m H n represents an alcohol-derived hydrocarbon group that forms an ester.
  • wax examples include ceresin, paraffin, petrolatum, mineral oil, liquid isoparaffin, and the like represented by the formula (XV).
  • n and n are each independently an integer of 1 or more.
  • the expansion coefficient, surface tension, water solubility, and interfacial tension of the second embodiment described above can maintain, for example, a hydrophilic polyoxyethylene group in water-insoluble in the above-described hydrocarbon compound having 5 or more carbon atoms.
  • liquid film cleaving agent of the first embodiment and the liquid film cleaving agent of the second embodiment may be used in combination of both agents in addition to the forms used separately. This point is the same for the first compound and the second compound in the liquid film cleaving agent of the second embodiment.
  • the surface tension of the liquid film (liquid having a surface tension of 50 mN / m) (The identification method described in the measurement method such as [gamma] w) can be used.
  • the component of the liquid film cleaving agent is a compound having a siloxane chain as the main chain or a hydrocarbon compound having 1 to 20 carbon atoms
  • the content ratio (OPU) with respect to the fiber mass is obtained by the above-described analysis method. It can be determined by dividing the content of the liquid film cleaving agent by the mass of the fiber based on the mass of the material.
  • the nonwoven fabric constituting the top sheet 1 has high liquid permeability regardless of the thickness of the fiber and the distance between the fibers.
  • the nonwoven fabric of the present invention is particularly effective when thin fibers are used.
  • the distance between the fibers decreases, and the narrow area between the fibers increases.
  • the distance between fibers is 120 ⁇ m, and the formed liquid film area ratio is about 2.6%.
  • the distance between the fibers is 85 ⁇ m, and the liquid film area ratio is about 7.8%, which is about three times that of a normal nonwoven fabric.
  • the liquid film cleaving agent according to the present invention reliably cleaves the liquid film that occurs frequently and reduces the liquid residue.
  • the liquid film area ratio is a liquid film area ratio calculated by image analysis from the nonwoven fabric surface, and has a strong correlation with the liquid remaining state on the outermost surface of the surface material. Therefore, when the liquid film area ratio decreases, the liquid in the vicinity of the skin is removed, the comfort after excretion is increased, and the absorbent article is comfortable to wear after excretion.
  • the liquid remaining amount mentioned later means the liquid amount currently hold
  • the whiteness of the surface is expressed as an L value described later.
  • the L value tends to decrease the remaining liquid amount and increase the numerical value due to the tearing of the liquid film on the surface, and whiteness tends to stand out visually.
  • the nonwoven fabric containing the liquid film cleaving agent according to the present invention can reduce the liquid film area ratio and the remaining amount of liquid even if the fiber is thinned, and can increase the L value. Therefore, the soft touch by thinning the fiber and the dry feeling And at a high level.
  • the nonwoven fabric according to the present invention as a constituent member such as a surface material of an absorbent article, the dry feeling at the part that touches the skin is high, and stains due to body fluids are not noticeable due to visual whiteness.
  • the distance between the fibers of the nonwoven fabric is preferably 150 ⁇ m or less, and more preferably 90 ⁇ m or less, from the viewpoint of increasing the softness of the touch.
  • the lower limit is preferably 50 ⁇ m or more, and more preferably 70 ⁇ m or more, from the viewpoint of suppressing the liquid permeability from being impaired due to excessive narrowing between fibers. Specifically, 50 ⁇ m or more and 150 ⁇ m or less is preferable, and 70 ⁇ m or more and 90 ⁇ m or less is more preferable.
  • the fineness of the fiber is preferably 3.3 dtex or less, and more preferably 2.4 dtex or less.
  • the lower limit is preferably 0.5 dtex or more, and more preferably 1 dtex or more. Specifically, it is preferably 0.5 dtex or more and 3.3 dtex or less, and more preferably 1 dtex or more and 2.4 dtex or less.
  • the interfiber distance is obtained by measuring the thickness of the nonwoven fabric to be measured as follows and applying it to the following formula (2). First, the nonwoven fabric to be measured is cut into a longitudinal direction of 50 mm and a width direction of 50 mm to produce a cut piece of the nonwoven fabric. If you cannot obtain a cut piece of this size, such as when the nonwoven fabric to be measured is incorporated in absorbent articles such as sanitary products and disposable diapers, cut the cut piece to the maximum size that can be obtained. Is made. The thickness of this cut piece is measured with a pressure of 49 Pa.
  • the measurement environment is a temperature of 20 ⁇ 2 ° C., the relative humidity is 65 ⁇ 5%, and the measurement instrument is a microscope (VHX-1000 manufactured by Keyence Corporation).
  • the boundary is determined from the fiber diameter, and the thickness is calculated.
  • the inter-fiber distance of the fibers constituting the nonwoven fabric to be measured is determined by the following formula based on Wrotnowski's assumption.
  • An expression based on the assumption of Wrotnowski is generally used when determining the inter-fiber distance of the fibers constituting the nonwoven fabric.
  • the interfiber distance A ( ⁇ m) is the thickness h (mm) of the nonwoven fabric, the basis weight e (g / m 2 ), the fiber diameter d ( ⁇ m) of the fibers constituting the nonwoven fabric, It is calculated
  • the fiber diameter d ( ⁇ m) is measured using a scanning electron microscope (DSC6200, manufactured by Seiko Instruments Inc.), 10 fiber cross-sections, and the average value is defined as the fiber diameter.
  • the fiber density ⁇ (g / cm 3 ) is measured according to the measuring method of the density gradient tube method described in JIS L1015 chemical fiber staple test method using a density gradient tube.
  • the cross-sectional shape of the fiber is measured with an electron microscope or the like, and the cross-sectional area of the fiber (the cross-sectional area of each resin component in a fiber formed of a plurality of resins) is measured, and the resin is measured with a DSC (differential thermal analyzer). Is specified (in the case of multiple resins, the approximate component ratio is also), the specific gravity is determined, and the fineness is calculated.
  • the cross section is first observed and the cross sectional area is calculated. Then, by measuring with DSC, it is comprised from single component resin from melting
  • nonwoven fabric fibers constituting the surface sheet 1 those normally used for this type of article can be employed without particular limitation.
  • various materials such as heat-fusible core-sheath composite fiber, heat-extensible fiber, non-heat-extensible fiber, heat-shrinkable fiber, non-heat-shrinkable fiber, three-dimensional crimped fiber, latent crimped fiber, hollow fiber, etc. Mention may be made of fibers.
  • a non-heat-extensible fiber and a non-heat-shrinkable fiber are heat-fusible.
  • the core-sheath type composite fiber may be a concentric core-sheath type, an eccentric core-sheath type, a side-by-side type, or an irregular shape, and is preferably a concentric core-sheath type.
  • the liquid film cleaving agent, or the liquid film cleaving agent and the phosphate type anionic surfactant may be contained in the fiber in any step.
  • a fiber film cleaving agent or a mixture of a liquid film cleaving agent and a phosphoric acid type anionic surfactant may be blended and applied to a fiber spinning oil that is usually used for fiber spinning.
  • a liquid film cleaving agent or a mixture of a liquid film cleaving agent and a phosphoric acid type anionic surfactant may be blended and applied to the finishing oil.
  • a liquid film cleaving agent or a phosphate ester type anionic surfactant may be blended with a fiber treatment agent usually used in the production of nonwoven fabrics, and may be applied to the fibers, or may be applied after forming into a nonwoven fabric.
  • the non-woven fabric constituting the surface sheet 1 contains a liquid film cleaving agent or a phosphate ester type anionic surfactant, and therefore has excellent liquid residue suppression corresponding to various fiber structures. Therefore, even when a large amount of liquid is applied to the nonwoven fabric, a liquid passage between the fibers is always ensured and the liquid permeability is excellent. Thereby, a various function can be added to a nonwoven fabric, without being restrict
  • it may be composed of one layer or may be composed of two or more layers.
  • the shape of a nonwoven fabric may be flat, the one side or both sides may be uneven, and the basis weight or density of the fiber may be variously changed.
  • the liquid film cleaving agent can be contained in the pattern shown in FIGS. 3 to 6 or any other pattern.
  • the surface liquid flow of a film sheet having no voids on the surface and a nonwoven sheet having voids is compared, if the entire sheet is hydrophilic, the nonwoven sheet is more hydrophilic as a whole sheet Performance is exhibited and the liquid flow is shorter than the film sheet.
  • the whole sheet is hydrophobic, the nonwoven fabric sheet exhibits more hydrophobic performance as the whole sheet, and the liquid flow becomes longer than the film sheet.
  • a part can be arranged.
  • this coating pattern has a convex portion in contact with the printing roll when a liquid film cleaving agent is applied to a nonwoven fabric having a concavo-convex shape by a printing method such as a flexographic printing method.
  • the pattern of the containing part of the nonwoven fabric shown in FIG. 9 is the same as or similar to that shown in FIG. Furthermore, since the surface sheet 1 is excellent in liquid permeability due to the action of the liquid film cleaving agent, the range of options for the combination with the absorber is widened. Moreover, the liquid film cleaving agent in case the nonwoven fabric which comprises the surface sheet 1 consists of multiple layers may be contained in all the layers, and may be contained in part. It is preferably contained in at least the layer on the skin contact surface side.
  • the liquid film cleaving agent is localized in the vicinity of at least some of the fiber entanglement points or the fiber fusion points.
  • the “localization” of the liquid film cleaving agent here is not a state in which the liquid film cleaving agent uniformly adheres to the entire surface of the fibers constituting the nonwoven fabric, but near the fiber entanglement point or fiber fusion point rather than the surface of each fiber. A state in which it is attached in the vicinity of the landing point. Specifically, it can be defined that the concentration of the liquid film cleaving agent near the entanglement point or the fusion point is higher than the fiber surface (the fiber surface between the entanglement points or between the fusion points).
  • the liquid film cleaving agent present near the fiber entanglement point or near the fiber fusion point may be attached so as to partially cover the space between the fibers around the fiber entanglement point or fiber fusion point.
  • concentration of the liquid film cleaving agent near the confounding point or the fusion point the better.
  • the concentration varies depending on the type of liquid film cleaving agent used, the type of fiber used, the ratio of active ingredients when mixed with other agents, etc., but is not uniquely determined. It can be determined as appropriate from the standpoint of exhibiting. Due to the localization of the liquid film cleaving agent, the liquid film cleaving action is more easily expressed.
  • the vicinity of the fiber entanglement point or the vicinity of the fiber fusion point is a place where a liquid film is particularly likely to be formed. Therefore, the presence of more liquid film cleaving agent at that place makes it easier to act directly on the liquid film.
  • the localization of the liquid film cleaving agent is preferably generated at 30% or more near the fiber entanglement point or near the fiber fusion point of the whole nonwoven fabric, more preferably 40% or more, and more preferably 50%. It is more preferable that it occurs at% or more.
  • the distance between fiber entanglement points or fiber fusion points is relatively short, the space between the fibers is small, and a liquid film is particularly likely to occur.
  • the liquid film cleaving agent is selectively localized near the fiber intersection or the fiber fusion point where the space between the fibers is small because the liquid film cleaving action is effectively exhibited.
  • the liquid film cleaving agent increases the coverage of a relatively small interfiber space and decreases the coverage of a relatively large interfiber space.
  • the “relatively small inter-fiber space” refers to an inter-fiber space having a fiber-to-fiber distance of 1/2 or less with respect to the inter-fiber distance determined by the above-described (inter-fiber distance measurement method).
  • the localized state of the liquid film cleaving agent can be confirmed by the following method. First, a nonwoven fabric is cut into 5 mm x 5 mm, and it attaches to a sample stand using a carbon tape. The sample stage is placed in a scanning electron microscope (S4300SE / N, manufactured by Hitachi, Ltd.) in an undeposited state, and is brought to a low vacuum or a vacuum state. Since detection is performed using an annular backscattered electron detector (accessory), the larger the atomic number, the easier it is to emit backscattered electrons. Therefore, polyethylene (PE), polypropylene (PP), and polyester (PET) are mainly used.
  • PE polyethylene
  • PP polypropylene
  • PET polyester
  • the localization state can be confirmed by whiteness.
  • the whiteness increases as the atomic number increases or the amount of adhesion increases.
  • the nonwoven fabric constituting the top sheet 1 when manufacturing the nonwoven fabric constituting the top sheet 1, a method usually used for this type of article can be adopted. For example, a card method, an airlaid method, a spunbond method, or the like can be used as a method for forming a fiber web. As a method for making a fiber web into a non-woven fabric, various commonly used non-woven fabric methods such as spunlace, needle punch, chemical bond, and dot embossing can be adopted. Among these, from the viewpoint of touch, an air-through nonwoven fabric and a spunbonded nonwoven fabric are preferable.
  • the “air-through nonwoven fabric” as used herein refers to a nonwoven fabric produced through a process (air-through treatment process) in which a fluid of 50 ° C.
  • the “spunbond nonwoven fabric” refers to a laminated nonwoven fabric manufactured by a spunbond method. This means not only non-woven fabrics produced only in this step, but also non-woven fabrics produced by adding this step to non-woven fabrics produced by other methods or non-woven fabrics produced by performing some steps after this step.
  • the nonwoven fabric of this invention is not restricted to what consists only of an air through nonwoven fabric and a spun bond nonwoven fabric, The air through nonwoven fabric and what combined the fiber sheet and film materials, such as a spun bond nonwoven fabric and another nonwoven fabric, are included.
  • the method of immersing a raw material nonwoven fabric in the solution containing a liquid film cleaving agent is mentioned.
  • the solution include a solution obtained by diluting a liquid film cleaving agent with a solvent (hereinafter, this solution is also referred to as a liquid film cleaving agent solution).
  • the solvent to be diluted include alcohols such as ethanol.
  • unit or the solution containing the said liquid film cleaving agent with respect to a raw material nonwoven fabric is mentioned.
  • a phosphate ester type anionic surfactant may be mixed in the solution containing the liquid film cleaving agent.
  • the content ratio of the liquid film cleaving agent and the phosphate ester type anionic surfactant is preferably as described above.
  • the solvent there can be used any solvent that can dissolve and disperse a liquid film cleaving agent having an extremely low water solubility in a solvent in an appropriate amount so that it can be easily applied to a non-woven fabric.
  • a raw material nonwoven fabric means the thing before apply
  • those used for the nonwoven fabric manufacturing method can be employed without any particular limitation.
  • application by spraying, application by slot coater, application by gravure method, flexo method, dipping method and the like can be mentioned.
  • a coating method is more preferable.
  • the flexo coating method is particularly preferable from the viewpoint of clarifying the localization of the liquid film cleaving agent.
  • a various nonwoven fabric can be especially used without a restriction
  • the fiber entanglement point is heat-sealed or thermocompression bonded, and the non-woven fabric obtained by thermally bonding fibers by air-through treatment or heat embossing as described above It is more preferable to use
  • the liquid film cleaving agent When the liquid film cleaving agent is attached to the fiber, it is preferably used as a fiber treatment agent containing the liquid film cleaving agent.
  • the “fiber treatment agent” described here means that an oily liquid film cleaving agent having extremely low water solubility is easily applied to a raw material nonwoven fabric or fiber by emulsifying with water and a surfactant. This is what is in a state.
  • the content ratio of the liquid film cleaving agent is preferably 50% by mass or less with respect to the mass of the fiber treatment agent. Thereby, the fiber treatment agent can be made into the state which emulsified stably the liquid film cleaving agent used as an oily component in a solvent.
  • the content ratio of the liquid film cleaving agent is more preferably 40% by mass or less, and further preferably 30% by mass or less with respect to the mass of the fiber treatment agent. Moreover, it is preferable to set it as said content rate from a viewpoint which a liquid film cleaving agent moves on a fiber with a moderate viscosity after coating, and implement
  • the content ratio of the liquid film cleaving agent is preferably 5% by mass or more, more preferably 15% by mass or more, and further preferably 25% by mass or more with respect to the mass of the fiber treatment agent from the viewpoint of expressing a sufficient liquid film cleavage effect. preferable.
  • the fiber processing agent containing a liquid film cleaving agent may contain another agent in the range which does not inhibit the effect
  • the phosphate ester type anionic surfactant described above may be included.
  • the content ratio of the liquid film cleaving agent and the phosphate ester type anionic surfactant is preferably as described above.
  • it may contain an antistatic agent or anti-friction agent used in fiber processing, a hydrophilizing agent imparting moderate hydrophilicity to the nonwoven fabric, an emulsifying agent imparting emulsification stability, and the like.
  • the nonwoven fabric 100 shown in FIG. 9 includes two layers, an upper layer 101 on the upper surface 1A (skin contact surface when used as a top sheet) side and a lower layer 102 on the lower surface 1B (non-skin contact surface when used as a top sheet) side. Become. Further, embossing (squeezing) is performed in the thickness direction from the upper surface 1A, and the two layers are joined (the embossed part is referred to as an embossed recess (concave joint) 130).
  • the lower layer 102 is a layer in which heat shrinkage of the heat-shrinkable fiber is expressed.
  • the upper layer 101 is a layer containing non-heat-shrinkable fibers, and the non-heat-shrinkable fibers are partially bonded by the concave bonding portion 13.
  • Non-heat-shrinkable fibers are not limited to those that do not shrink at all, but include those that shrink to such an extent that the heat-shrinkable fibers of the lower layer 12 are not inhibited.
  • a non-heat-shrinkable heat-fusible fiber is preferable from the viewpoint of forming a nonwoven fabric by heat.
  • This non-woven fabric 100 can be manufactured, for example, by the materials and manufacturing methods described in paragraphs [0032] to [0048] of JP-A-2002-187228.
  • this production for example, after embossing the laminated body of the upper layer 101 and the lower layer 102 from the upper layer side 101, the heat-shrinkable fibers are thermally contracted by heat treatment. At this time, the embossed portions adjacent to each other are pulled by the contraction of the fibers, and the interval between the embossed portions is reduced. Due to this deformation, the fibers of the upper layer 101 protrude from the embossed concave portion 130 toward the upper surface 1 ⁇ / b> A to form a convex portion 140.
  • the upper layer is laminated in a state where the lower layer 102 in which heat shrinkage is developed is stretched, and the above-described embossing is performed. Thereafter, when the extended state of the lower layer 102 is released, the upper layer 101 side rises to the upper surface 1A side, and the convex portion 140 is formed.
  • This embossing can be performed by a commonly used method such as heat embossing or ultrasonic embossing.
  • a joining method using an adhesive may be used.
  • the upper layer 101 is squeezed and bonded to the lower layer side 102 in the embossed recess (concave joint) 130.
  • the embossed recesses 130 are formed in the form of dots in the plane direction of the nonwoven fabric 100, and the portion surrounded by the embossed recesses 130 is the above-described convex portion 140 where the upper layer 101 is raised.
  • the convex portion 140 has a three-dimensional solid shape, for example, a dome shape.
  • the convex part 140 formed by the manufacturing method as described above has a fiber in a coarser state than the lower layer 102.
  • the inside of the convex portion 140 may be filled with fibers as shown in FIG.
  • the arrangement of the embossed recesses 130 and the projections 140 may be arbitrary, and may be a grid arrangement, for example.
  • Examples of the lattice arrangement include an arrangement in which a plurality of rows of a plurality of embossed concave portions 130 are arranged, and the embossed concave portions 130 in each row are shifted by an anti-pitch between adjacent rows.
  • the embossed recess 130 when viewed in a plan view, it may be a circle, an ellipse, a triangle, a rectangle, or other polygonal shapes, and can be arbitrarily set as appropriate.
  • the embossed recess 130 may have a linear shape in addition to the dot shape.
  • the nonwoven fabric 100 Since the nonwoven fabric 100 has an uneven surface having the convex portion 140 and the embossed concave portion 130 on the upper surface 1A side, the nonwoven fabric 100 is excellent in shape recoverability when stretched in the plane direction and compression deformability when compressed in the thickness direction. . Moreover, it becomes a comparatively bulky nonwoven fabric by the protrusion of the fibers of the upper layer 101 as described above. Thereby, the user who touched the nonwoven fabric 10 can feel a soft gentle touch. Further, in an absorbent article in which the nonwoven fabric 100 is incorporated as a surface sheet having the upper surface 1A as the skin contact surface and the lower surface 1B as the non-skin contact surface, the skin contact surface side is uneven with protrusions 140 and embossed recesses 130. Excellent breathability.
  • the nonwoven fabric 100 has less liquid residue due to the action of the liquid film cleaving agent described above or the cooperative action of the liquid film cleaving agent and the phosphate ester type anionic surfactant. Thereby, the liquid permeability using the uneven
  • the nonwoven fabric 100 is not restricted to the two-layer structure of the upper layer 101 and the lower layer 102, and may have another layer.
  • a single layer or a plurality of layers may be disposed between the upper layer 101 and the lower layer 102, and a single layer or a plurality of layers may be disposed on the upper surface 1A side and the lower surface 1B side of the nonwoven fabric 100.
  • This single layer or multiple layers may be a layer having heat-shrinkable fibers or a layer having non-heat-shrinkable fibers.
  • the basis weight of the nonwoven fabric finally obtained is preferably 10 g / m 2 or more and 100 g / m 2 or less, particularly preferably 15 g / m 2 or more and 80 g / m 2 or less.
  • the material of the constituent members of the sanitary napkin 10 of the present embodiment can be used without particular limitation.
  • the surface sheet 1 includes those described above.
  • the absorbent core may further contain a superabsorbent polymer.
  • the material for the core wrap sheet include paper and pulp sheets manufactured using hydrophilic fibers as raw materials, and hydrophilic nonwoven fabrics.
  • the absorbent body 3 may be a sheet. Examples of the sheet-like material include paper and pulp sheets manufactured using hydrophilic fibers as raw materials.
  • a water absorbent sheet for example, a water absorbent described in JP-A-8-246395
  • a water absorbent core made of an aggregate of superabsorbent polymer materials is sandwiched and fixed between two base sheets (absorbent paper or nonwoven fabric).
  • a polymer sheet described in JP-A No. 2004-275225 a water absorbent sheet in which an absorbent core made of an aggregate of superabsorbent polymer materials is sandwiched and fixed between two base sheets (absorbent paper or nonwoven fabric).
  • the fibers of the fiber assembly and the hydrophilic fibers include, for example, natural fibers such as wood pulp and plant pulp such as softwood pulp and hardwood pulp, regenerated fibers such as cupra and rayon, semi-synthetic fibers such as acetate, polyolefins, Examples thereof include synthetic fibers such as polyamides and polyesters, and one of these can be used alone or two or more of them can be used in combination.
  • the top sheet 1 is liquid permeable, and those used for this type of article can be used without particular limitation.
  • a hydrophilic thermal bond nonwoven fabric is preferable, and an air-through nonwoven fabric is particularly preferable from the viewpoint of promptly absorbing the excreted body fluid and transmitting it to the absorbent body and the good touch.
  • It is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp.
  • polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples.
  • Hydrophilic agents include various alkyl sulfonates represented by ⁇ -olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.
  • a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.
  • the side sheet 4 for example, a spunbond-meltblown-spunbond laminated non-woven fabric (SMS non-woven fabric), a spunbond-meltblown-meltblown-spunbond non-woven fabric (SMMS non-woven fabric) or the like, a water-repellent non-woven fabric with high water resistance, or a spunbond non-woven fabric And a laminate of a nonwoven fabric such as a spunbond nonwoven fabric and a moisture permeable or moisture permeable resin film.
  • SMS non-woven fabric spunbond-meltblown-spunbond laminated non-woven fabric
  • SMMS non-woven fabric spunbond-meltblown-meltblown-spunbond non-woven fabric
  • a water-repellent non-woven fabric with high water resistance or a spunbond non-woven fabric
  • a laminate of a nonwoven fabric such as a spunbond nonwoven fabric and a moisture permeable or moisture permeable resin film.
  • the sanitary napkin 10 of this embodiment has the liquid film cleaving agent containing part 6 and the non-containing part 11 in the topsheet 1 as described above, other member configurations and shapes are particularly limited as described above.
  • the absorbent article of the present invention may be a combination of grooves separated into a plurality of leak-proof grooves 5 instead of annular.
  • the rear portion R may have a rear flap portion that extends long so as to cover the wearer's buttocks, or may have a second sheet between the topsheet 1 and the absorbent body 3. Good.
  • you may have the adhesion part fixed to underwear in the non-skin contact surface side of the back surface sheet 2, and also there may be a peeling sheet etc. which covers this adhesion part so that peeling is possible.
  • the liquid film cleaving agent may be further contained in another member in addition to the top sheet 1.
  • the absorbent article of the present invention is not limited to the above-mentioned sanitary napkin as long as it has a surface sheet containing a liquid film cleaving agent, and may be various ones that absorb and retain excretory fluid.
  • it may be a panty liner, an incontinence pad, a diaper, a urine collection pad, or the like.
  • the present invention further discloses the following absorbent article with respect to the above-described embodiment.
  • An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
  • the absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion
  • the said surface sheet is an absorbent article which has the containing part and non-containing part of a liquid film cleaving agent, and has the said containing part in the said excretion opening opposing part.
  • An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
  • the absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion
  • the said surface sheet is an absorptive article which has the containing part and non-containing part of the following compound C1, and has the said containing part in the said excretion mouth opposing part.
  • Compound C1 A compound having a water solubility of 0 g or more and 0.025 g or less and an expansion coefficient of 15 mN / m or more for a liquid having a surface tension of 50 mN / m.
  • the compound C1 or the liquid film cleaving agent comprises a compound having at least one structure selected from the group consisting of the following structures X, XY, and YXY. > Any one of>.
  • Structure X is> C (A)- ⁇ C represents a carbon atom. ⁇ ,>, And-indicate a bond. The same applies hereinafter.
  • a hydrogen atom or —C (A) 3 , —C (A) 2 B, —C (A) (B) 2, —C (A) 2 —C (R 1 ) 3 , -C (R 1 ) 2 A, -C (R 1 ) 3 , -OSi (R 1 ) 3 , -OSi (R 1 ) 2 (R 2 ), -Si (R 1 ) 3 , -Si (R 1 ) 2 It has at least one group selected from the group consisting of (R 2 ).
  • Each of R 1 and R 2 independently represents a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, or a halogen atom.
  • a and B each independently represent a substituent containing an oxygen atom or a nitrogen atom.
  • R 1 , R 2 , A, and B in the structure X may be the same as or different from each other.
  • Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom.
  • Y is plural, they may be the same or different.
  • the compound C1 or the liquid film cleaving agent is composed of an organically modified silicone that is a silicone-based surfactant.
  • organically modified silicone amino-modified, epoxy-modified, carboxy-modified, diol-modified, carbinol-modified, (meth) acrylic.
  • the compound C1 or the liquid film cleaving agent comprises a polyoxyalkylene-modified silicone, and the polyoxyalkylene-modified silicone is at least one selected from the group consisting of compounds represented by the following formulas [I] to [IV].
  • R 32 represents a single bond or an alkylene group (preferably having a carbon number of 1 to 20, for example, a methylene group, an ethylene group, a propylene group or a butylene group is preferred), and preferably represents the alkylene group.
  • the plurality of R 31 and the plurality of R 32 may be the same as or different from each other.
  • M 11 represents a group having a polyoxyalkylene group, and a polyoxyalkylene group is preferable.
  • the polyoxyalkylene group include a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a copolymer of these constituent monomers.
  • m and n are each independently an integer of 1 or more. Note that the symbols of these repeating units are determined separately in each of the formulas [I] to [IV], and do not necessarily indicate the same integer, and may be different.
  • liquid film cleaving agent has an expansion coefficient greater than 0 mN / m for a liquid having a surface tension of 50 mN / m and an interfacial tension of 20 mN / m or less for a liquid having a surface tension of 50 mN / m.
  • An absorbent article having a top sheet, a back sheet, and an absorbent body between the top sheet and the back sheet,
  • the absorbent article is disposed on the skin contact surface side, continuously or discontinuously in the surface direction so as to surround the excretion opening facing portion facing the wearer's excretion opening, and the excretion opening facing portion, A thickness recess of the topsheet and the absorber, and a waste liquid diffusion region between the thickness recess and the excretion opening facing portion
  • the said surface sheet is an absorbent article which has the containing part and non-containing part of the following compound C2, and has the said containing part in the said excretion mouth opposing part.
  • Compound C2 A compound whose water solubility is 0 g or more and 0.025 g or less, the expansion coefficient for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m is 20 mN / m or less .
  • the compound C2 or the liquid film cleaving agent comprises a compound having at least one structure selected from the group consisting of the following structures Z, ZY, and YZY: ⁇ 8> and ⁇ 9> any one of an absorptive article.
  • the structure Z includes:> C (A)- ⁇ C: carbon atom>, -C (A) 2- , -C (A) (B)-,> C (A) -C (R 3 ) ⁇ ,> C Any basic structure of (R 3 ) —, —C (R 3 ) (R 4 ) —, —C (R 3 ) 2 —,> C ⁇ is repeated, or two or more are combined Represents a hydrocarbon chain of structure.
  • R 3 , R 4 , A, and B may be the same as or different from each other.
  • R 3 and R 4 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group, a fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or a fluorine atom.
  • a and B each independently represent a substituent containing an oxygen atom or a nitrogen atom.
  • Y represents a hydrophilic group having hydrophilicity including an atom selected from a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a phosphorus atom, and a sulfur atom. When Y is plural, they may be the same or different.
  • the compound C2 or the liquid film cleaving agent is a polyoxyalkylene alkyl (POA) ether represented by any one of the following formula [V] and a polyoxyalkylene alkyl (POA) ether represented by the following formula [VI] having a mass average molecular weight of 1000 or more.
  • ⁇ 1>, ⁇ 2> and ⁇ 8> to ⁇ 10> comprising at least one compound selected from the group consisting of oxyalkylene glycol, steareth, behenez, PPG myristyl ether, PPG stearyl ether and PPG behenyl ether.
  • the absorbent article according to any one of the above.
  • L 21 represents an ether group, an amino group, an amide group, an ester group, a carbonyl group, a carbonate group, a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, or a polyoxyalkylene group obtained by combining them
  • a linking group such as R 51 is a hydrogen atom, methyl group, ethyl group, propyl group, isopropyl group, butyl group, pentyl group, hexyl group, heptyl group, 2-ethylhexyl group, nonyl group, decyl group, methoxy group, ethoxy group, phenyl group , A fluoroalkyl group, an aralkyl group, a hydrocarbon group obtained by combining them, or various substituents composed of a fluorine atom.
  • A, b, m and n are each independently an integer of 1 or more.
  • the number of carbon atoms and the number of hydrogen atoms are determined independently in each of the formulas [V] and [VI], and may not necessarily represent the same integer and may be different.
  • “m” in — (C a H b O) m — is an integer of 1 or more.
  • the value of this repeating unit is determined independently in each of the formulas [V] and [VI], and does not necessarily indicate the same integer, and may be different.
  • the compound C2 or the liquid film cleaving agent is a fatty acid represented by the following formula [VII], a glycerin fatty acid ester and a pentaerythritol fatty acid ester represented by the following formula [VIII-I] or [VIII-II], A partially esterified product of glycerin fatty acid ester, sorbitan fatty acid ester, and pentaerythritol fatty acid ester represented by any one of [IX], any of the following formula [X], or any of the following formula [XI], [XII] a compound having a sterol structure, an alcohol represented by the following formula [XIII], a fatty acid ester represented by the following formula [XIV], and a wax represented by the following formula [XV].
  • C m H n, C m 'H n' and C m '' H n '' are each a hydrocarbon group of each of the fatty acid.
  • m and n are each independently an integer of 1 or more.
  • the plurality of m and the plurality of n may be the same as or different from each other.
  • C m H n is a hydrocarbon group of each of the above fatty acids.
  • R 52 represents a linear or branched, saturated or unsaturated hydrocarbon group (an alkyl group, an alkenyl group, an alkynyl group, etc.) having 2 to 22 carbon atoms.
  • m and n are each independently an integer of 1 or more.
  • the plurality of m and the plurality of n may be the same as or different from each other.
  • C m H n is a hydrocarbon group of each of the above fatty acids.
  • m and n are each independently an integer of 1 or more.
  • C m H n is a hydrocarbon group of each of the above alcohol.
  • m and n are each independently an integer of 1 or more.
  • C m H n may be the same or different.
  • C m H n -COO- of C m H n is a hydrocarbon group of each of the above fatty acids.
  • C m H n in —COOC m H n represents an alcohol-derived hydrocarbon group that forms an ester.
  • m and n are each independently an integer of 1 or more.
  • the viscosity of the compound C1, the compound C2 or the liquid film cleaving agent is 0 cps or more, preferably 10,000 cps or less, more preferably 1000 cps or less, and further preferably 200 cps or less, any one of the above items ⁇ 1> to ⁇ 12> 2.
  • the thickness concave portion is any one of the items ⁇ 1> to ⁇ 13>, which is a portion formed by pressing from the skin contact surface side of the topsheet into the absorbent body in the thickness direction of the absorbent article.
  • Absorbent article as described in 1.
  • ⁇ 15> The absorbent article according to any one of ⁇ 1> to ⁇ 14>, wherein the topsheet has the inclusion part and the non-containment part in the excretory fluid diffusion region.
  • the area ratio of the containing part in the excretory fluid diffusion region is 5% or more and 50% or less, preferably 10% or more, more preferably 20% or more, and preferably 40% or less, more preferably 30% or less.
  • ⁇ 17> The area ratio of the said containing part in the said excretion liquid diffusion area
  • ⁇ 18> ⁇ 1> to ⁇ 17> wherein the top sheet has the non-containing portion together with the containing portion in the excretory opening facing portion, and the area ratio of the containing portion in the excretion opening facing portion is 50% or more.
  • the absorbent article according to any one of the above. ⁇ 19> The area ratio of the containing part in the excretory mouth facing part is 50% or more and less than 100%, preferably 60% or more, more preferably 70% or more, and preferably 95% or less, more preferably 90% or less.
  • the area ratio of the containing part in the said excretion mouth opposing part is an absorbent article as described in said ⁇ 18> which is 70% or more and 90%.
  • the topsheet has the containing part and the non-containing part in the excretory fluid diffusion region,
  • ⁇ 24> The absorbent article according to ⁇ 23>, wherein the non-containing portion in the excretory fluid diffusion region is disposed adjacent to the thickness recess.
  • the absorbent article according to any one of the above items ⁇ 1> to ⁇ 24>, which is shorter than the length of the part.
  • the ratio (S2 / S1) of the length (S2) of the containing part on the imaginary line to the length (S1) of the non-containing part is 1/19 or more and 1/1 or less, and preferably 2/3 or less. 3/7 or less is more preferable, 1/9 or more is preferable and 1/4 or more is more preferable
  • the ratio (S2 / S1) of the length (S2) of the containing part on the imaginary line to the length (S1) of the non-containing part is 1 ⁇ 4 or more and 3/7 or less, according to ⁇ 25>.
  • ⁇ 28> The difference between the contact angle of the constituent fibers of the containing part and the contact angle of the constituent fibers of the non-containing part is 5 degrees or more and 60 degrees or less, preferably 10 degrees or more, more preferably 20 degrees or more, and 50 degrees
  • ⁇ 29> The absorbent article according to any one of ⁇ 1> to ⁇ 27>, wherein the difference between the contact angle of the constituent fibers of the containing part and the contact angle of the constituent fibers of the non-containing part is 20 degrees or more and 40 degrees or less. .
  • ⁇ 30> Any one of the above items ⁇ 1> to ⁇ 29>, wherein the contact angle of the constituent fibers of the non-containing part is preferably 90 degrees or less, more preferably 80 degrees or less, and further preferably 70 degrees or less.
  • ⁇ 31> Any one of the above items ⁇ 1> to ⁇ 30>, wherein the contact angle of the constituent fibers of the containing part is preferably 110 degrees or less, more preferably 90 degrees or less, and still more preferably 80 degrees or less. 2.
  • ⁇ 32> The absorbent article according to any one of ⁇ 1> to ⁇ 31>, wherein the topsheet contains a phosphate ester type anionic surfactant.
  • ⁇ 34> The absorbent article according to any one of ⁇ 1> to ⁇ 33>, wherein the absorbent article is a sanitary napkin.
  • Example 1 The uneven raw material nonwoven fabric shown in FIG. 9 was produced by the method described above.
  • Non-heat-shrinkable heat-bonded fibers with a fineness of 1.2 dtex are used for the upper layer (layer on the first surface 1A side), and heat-shrinkable fibers with a fineness of 2.3 dtex are used for the lower layer (layer on the second surface 1B side).
  • the distance between the fibers in the upper layer was 80 ⁇ m
  • the distance between the fibers in the lower layer was 60 ⁇ m.
  • the fiber diameter of the said nonwoven fabric was 11 micrometers
  • the basic weight was 74 g / m ⁇ 2 >.
  • Polyoxyethylene (POE) modified dimethyl silicone KF-6015 manufactured by Shin-Etsu Chemical Co., Ltd.
  • X in the structure XY is from —Si (CH 3 ) 2 O— to the surface of the uneven structure of the raw material nonwoven fabric.
  • a dimethylsilicone chain wherein Y is a POE chain composed of — (C 2 H 4 O) —, the terminal group of the POE chain is a methyl group (CH 3 ), the modification rate is 20%, and the polyoxyethylene addition mole number 4 shows the arrangement of the containing part 6 and the non-containing part 7 in the area corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 by flexographic printing of a liquid film cleaving agent having a mass average molecular weight of 4000. Coating was performed so as to obtain a pattern obtained by rotating the lattice shown in (B) by 90 degrees.
  • the area ratio ( ⁇ sum of the total area of the containing part / the total area of the containing part and the non-containing part ⁇ ⁇ 100) of the containing part 6 in each of the excretory opening facing part 11 and the excretory liquid diffusion region 12 was set to 25%. .
  • a liquid film cleaving agent was not applied to the region to be the thickness recessed portion 8, and the portion 7 was not included.
  • the non-contained portion 7 of the excretory fluid diffusion region 12 is arranged so as not to be adjacent to the region that becomes the thickness concave portion 8.
  • the content rate (OPU) with respect to the fiber mass of the whole nonwoven fabric of a liquid film cleaving agent was 0.4 mass%.
  • the nonwoven fabric after coating was used as the nonwoven fabric sample for the topsheet of Example 1.
  • the viscosity of the liquid film cleaving agent itself was 163 cps as a result of measurement by the method described above (Method for measuring the viscosity of a liquid cleaving agent).
  • the liquid film cleaving agent had a surface tension of 21.0 mN / m and a water solubility of less than 0.0001 g.
  • the expansion coefficient of the liquid film cleaving agent for a liquid having a surface tension of 50 mN / m was 28.8 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m was 0.2 mN / m. .
  • These numerical values were measured by the measurement method described above.
  • “a liquid having a surface tension of 50 mN / m” is obtained by adding polyoxyethylene sorbitan monolaurate, which is a nonionic surfactant, to 100 g of deionized water (trade name: Leool Super TW-L120, manufactured by Kao Corporation).
  • Example 2 The arrangement of the containing part 6 and the non-containing part 7 in the areas corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 is a stripe pattern shown in FIG.
  • a nonwoven fabric sample for a topsheet of Example 2 was prepared in the same manner as in Example 1 except that the area ratio of the liquid film cleaving agent containing part 6 in each of 12 was as shown in Table 1.
  • Example 3 The arrangement of the containing part 6 in each area corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 is a dot pattern as shown in the excretion opening facing part 11 of FIG.
  • a nonwoven fabric sample for the topsheet of Example 3 was prepared in the same manner as in Example 1 except that the area ratio of the liquid film cleaving agent containing part 6 in each region 12 was as shown in Table 1.
  • Example 4 was performed in the same manner as Example 2 except that the area ratio of the liquid film cleaving agent containing part 6 in each region corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 was as shown in Table 1. A nonwoven fabric sample for the top sheet was prepared.
  • Example 5 The area ratio of the containing part 6 of the liquid film cleaving agent in each region corresponding to the excretory opening facing part 11 and the excretory fluid diffusion region 12 is as shown in Table 1, and a part of the non-contained part 7 of the excretory fluid diffusion region 12 A nonwoven fabric sample for a top sheet of Example 5 was prepared in the same manner as in Example 3 except that it was arranged adjacent to the region to be the thickness recess 8.
  • Example 6 The entire region corresponding to the excretion mouth facing portion 11 is only the containing portion 6, and the arrangement of the containing portion 6 in the region corresponding to the excretory fluid diffusion region 12 is a pattern obtained by rotating the lattice shown in FIG.
  • the surface sheet of Example 6 was used in the same manner as in Example 5 except that the area ratio of the liquid film cleaving agent containing part 6 in each of the excretory opening facing part 11 and the excretory liquid diffusion region 12 was as shown in Table 1.
  • a nonwoven fabric sample was prepared.
  • Example 7 Epoxy-modified dimethylsilicone (KF-101, manufactured by Shin-Etsu Chemical Co., Ltd.) as a liquid film cleaving agent, X in structure XY is a dimethylsilicone chain composed of —Si (CH 3 ) 2 O—, Y is — (RC 2 H 3 O) — and an epoxy group comprising a modification of 32% and a mass average molecular weight of 35800.
  • a nonwoven fabric sample was prepared.
  • the viscosity of the liquid film cleaving agent itself was 1515 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
  • the liquid film cleaving agent had a surface tension of 21.0 mN / m and a water solubility of less than 0.0001 g.
  • the expansion coefficient of the liquid film cleaving agent for a liquid having a surface tension of 50 mN / m was 26.0 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m was 3.0 mN / m.
  • Example 8 Tricaprylic acid / glycol caprate (Coconard MT manufactured by Kao Corporation) as a liquid film cleaving agent, and Z in the structure ZY is * —O—CH (CH 2 O— *) 2 (* represents a bond) Y is composed of a hydrocarbon chain of C 8 H 15 O— or C 10 H 19 O—, the fatty acid composition is composed of 82% caprylic acid and 18% capric acid, and the mass average molecular weight is 550.
  • a non-woven fabric sample for a top sheet of Example 8 was produced in the same manner as Example 7 except that the above was used.
  • the viscosity of the liquid film cleaving agent itself was 24.1 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
  • the liquid film cleaving agent had a surface tension of 28.9 mN / m and a water solubility of less than 0.0001 g.
  • the expansion coefficient of the liquid film cleaving agent for a liquid having a surface tension of 50 mN / m was 8.8 mN / m, and the interfacial tension for a liquid having a surface tension of 50 mN / m was 12.3 mN / m.
  • Example 9 A nonwoven fabric sample for the top sheet of Example 9 is prepared in the same manner as in Example 7 except that liquid isoparaffin (rubitol Lite, manufactured by BASF Japan Ltd.) having a mass average molecular weight of 450 is used as the liquid film cleaving agent. did.
  • the viscosity of the liquid film cleaving agent itself was 24.1 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
  • the liquid film cleaving agent had a surface tension of 27.0 mN / m and a water solubility of less than 0.0001 g.
  • the expansion coefficient of the liquid film cleaving agent for a liquid with a surface tension of 50 mN / m was 14.5 mN / m, and the interfacial tension for a liquid with a surface tension of 50 mN / m was 8.5 mN / m. These numerical values were measured by the same method as in Example 1.
  • Example 10 A nonwoven fabric sample for a top sheet of Example 10 was produced in the same manner as in Example 2 except that the region to be the thickness recess 8 was changed to the containing part 6 of the liquid film cleaving agent.
  • Example 11 Polypropylene glycol (PPG) (anti-foaming agent No. 1 manufactured by Kao Corporation) as a liquid film cleaving agent, X in structure X is composed of POP chains, 52 number of moles of polyoxypropylene group, mass average molecular weight A nonwoven fabric sample for the top sheet of Example 13 was produced in the same manner as in Example 6 except that 3000 was used.
  • the viscosity of the liquid film cleaving agent itself was 470 cps as a result of measurement by the method described above (Method for measuring viscosity of liquid cleaving agent).
  • the liquid film cleaving agent had a surface tension of 32.7 mN / m and a water solubility of less than 0.0001 g.
  • the expansion coefficient of the liquid film cleaving agent for a liquid with a surface tension of 50 mN / m was 16.3 mN / m, and the interfacial tension for a liquid with a surface tension of 50 mN / m was 1.0 mN / m.
  • Comparative Example 1 The raw material nonwoven fabric used in Example 1 before applying the liquid film cleaving agent was prepared as a nonwoven fabric sample of Comparative Example 1 as it was.
  • Example 10 is the same as Example 1 except that each of the areas corresponding to the excretory opening facing part 11 and the excretory liquid diffusion area 12 and the area that becomes the thickness recessed part 8 is the containing part 6 of the liquid film cleaving agent. A nonwoven fabric sample for the top sheet was prepared.
  • a surface sheet is removed from a sanitary napkin (manufactured by Kao Corporation: Whyr F, happy bare skin 30 cm, made in 2014), and a nonwoven fabric sample (hereinafter referred to as a nonwoven fabric sample) is used instead.
  • a sanitary napkin for evaluation obtained by laminating so that the surface of the concavo-convex structure is on the skin contact surface side, fixing the periphery thereof, and further forming the thickness concave portion 8 shown in FIG. Produced.
  • An acrylic plate having a transmission hole with an inner diameter of 1 cm was overlaid on the surface of each evaluation sanitary napkin, and a constant load of 100 Pa was applied to the napkin. Under such a load, 6.0 g of pseudo blood corresponding to menstrual blood (adjusted equine defibrinated blood manufactured by Japan Biotest Laboratories Co., Ltd. to 8.0 cP) was poured from the perforation hole of the acrylic plate. The equine defibrinated blood used was adjusted with a TVB10 viscometer manufactured by Toki Sangyo Co., Ltd. under the condition of 30 rpm.
  • the mixing ratio of the part was adjusted to 8.0 cP.
  • the acrylic plate is removed 60 seconds after a total of 6.0 g of simulated blood has been poured.
  • the weight (W2) of the nonwoven fabric sample was measured, and the difference (W2 ⁇ W1) from the weight (W1) of the nonwoven fabric sample before flowing the simulated blood, which had been measured in advance, was calculated.
  • the above operation was performed 3 times, and the average value of the 3 times was defined as the remaining liquid amount (mg).
  • the liquid remaining amount is an index of how much the wearer's skin gets wet. The smaller the liquid remaining amount, the better the result.
  • test apparatus As the test apparatus, a test apparatus having a mounting portion in which the mounting surface of the test sample is inclined by 45 ° with respect to the horizontal plane was used. A sanitary napkin for evaluation using each sample as a top sheet was placed on the mounting portion with the top sheet facing upward and the vertical direction of the sanitary napkin being an inclined direction. The sanitary napkin for evaluation was prepared by the same method as the measurement of the remaining liquid amount of the top sheet (nonwoven fabric sample).
  • the length of the liquid flow in the vertical direction is an indicator of how easily the liquid flows on the surface without being absorbed by the test sample and is more likely to leak during installation. The shorter the liquid flow length in the vertical direction, the higher the liquid flow length. It becomes evaluation.
  • (Liquid flow length in the width direction of the nonwoven fabric surface) As a test apparatus, a sanitary napkin for evaluation using each sample as a top sheet is used, with the top surface of the test sample placed on the upper side. The direction and the width direction of the sanitary napkin were measured in the same manner as the liquid flow length in the longitudinal direction of the nonwoven fabric surface, except that the direction of inclination was the inclination direction. The average of the three measurements was taken as the liquid flow length (mm) in the width direction.
  • the liquid flow length in the width direction is an index of how easily the liquid flows on the surface without being absorbed by the test sample and is likely to leak in the width direction of the wearer during wearing. The shorter the length, the higher the rating.
  • the macro expandability of the liquid film cleaving agent can be evaluated by the macro expansion distance of the liquid film cleaving agent. Separately from the above test, the macro expansion distance of each liquid film cleaving agent used in Examples 1, 7, 8, and 9 was measured by the following method. Each liquid film cleaving agent used in Examples 1, 7, 8 and 9 was colored, and each colored liquid film cleaving agent was attached to the top of the convex part of the uneven nonwoven fabric of FIG. A sanitary napkin for evaluation was prepared in the same manner as described above (the amount of remaining liquid on the topsheet) except that a dot-shaped containing portion was formed.
  • the basis weight of the liquid film cleaving agent at this time was 25.9 g / m 2 .
  • An acrylic plate having a permeation hole with an inner diameter of 1 cm is overlaid on the surface of the sanitary napkin for evaluation, and a constant load of 100 Pa is applied to the napkin.
  • the equine defibrinated blood manufactured by Japan Biotest Laboratories Co., Ltd. was adjusted to 8.0 cP) 6.0 g twice and was allowed to stand for 60 seconds.
  • the region where the liquid film cleaving agent was diffused was measured as a distance in 8 directions from the center of the dot-shaped containing part, and the average value was taken as the macro extended distance of the liquid film cleaving agent.
  • the liquid remaining amount was 233 g.
  • the liquid remaining amount is reduced to about half or less of Comparative Example 1 by having the part containing the liquid film cleaving agent in the part opposite to the excretion opening that directly receives the excretion liquid. Effective cleavage of the liquid film was confirmed. That is, Examples 1 to 11 had a high effect of reducing liquid residue.
  • Reference Example 1 in which the liquid film cleaving agent was incorporated in the entire surface sheet there was room for improvement in the liquid flow length in the longitudinal direction and the width direction of the nonwoven fabric surface, although reduction of the liquid residue was observed. .
  • Examples 1 to 11 the liquid film cleaving agent-containing part and the non-containing part were mixed and disposed in a predetermined ratio in the excretory liquid diffusion region surrounding the excretory opening facing part.
  • the liquid flow length in the width direction was suppressed more than that of Reference Example 1, and the leakage prevention property was higher than that of Reference Example 1.
  • Examples 1 to 11 achieved both improvement in liquid residue reduction and improvement in leakage prevention.
  • Example 1 to 6 the higher the area ratio of the containing part in the excretory opening facing part, the higher the liquid residue reducing effect. In particular, when the area ratio is 50% or more (Examples 3 to 6), the liquid residual reducing effect is high. It was. In Examples 1 to 6, the lower the area ratio of the containing part of the excretory liquid diffusion region (the higher the area ratio of the non-containing part), the shorter the liquid flow length in the vertical and width directions of the surface sheet surface. It was suppressed.
  • Example 10 which does not contain a liquid film cleaving agent in the thickness recess contains Example 10 containing a liquid film cleaving agent in the thickness recess.
  • the thickness concavity and the non-contained portion of the excretory fluid diffusion region are The liquid flow length in the width direction was suppressed to be shorter in the adjacent example 5 than in the non-adjacent example 3. That is, it turned out that the thickness recessed part which does not contain a liquid film cleaving agent, and the non-contained part of the excretory liquid diffusion region cooperate to block the liquid flow and enhance the leakage prevention property of the napkin sample.
  • each liquid film cleaving agent used in Examples 1 to 10 has a dot-like content part having a diameter of 0.8 mm. It was confirmed that it extends to the non-contained part beyond. As a result, in Examples 1 to 10, the liquid remaining reduction effect is equivalent to that of Reference Example 1 even when the containing part and the non-containing part are mixedly arranged in the excretory opening facing part and the excretory liquid diffusion area. It was demonstrated at the level.

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Abstract

L'invention concerne un article absorbant présentant une feuille avant, une feuille arrière et un corps absorbant entre la feuille avant et la feuille arrière, l'article absorbant étant doté, sur son côté surface en contact avec la peau, d'une section tournée vers l'orifice de sortie qui fait face à un orifice de sortie de l'utilisatrice de l'article absorbant, d'un évidement dans la direction de l'épaisseur dans la feuille avant et d'un corps absorbant qui est disposé de manière continue ou discontinue dans la direction de la surface de façon à entourer la section tournée vers l'orifice de sortie, et d'une région de dispersion de sortie de liquide entre l'évidement dans la direction de l'épaisseur et la section tournée vers l'orifice de sortie ; la feuille avant comporte des sections d'inclusion et des sections de non-inclusion d'un agent de clivage de film liquide ; et la section faisant face à l'orifice de sortie présente des sections d'inclusion mentionnées ci-dessus.
PCT/JP2017/019769 2016-05-31 2017-05-26 Article absorbant Ceased WO2017209010A1 (fr)

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JP6802407B1 (ja) * 2020-04-30 2020-12-16 ユニ・チャーム株式会社 吸収性物品
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