JPH10168729A - Filament nonwoven cloth and absorbing material using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject nonwoven cloth having excellent adhesiveness and useful as a paper diaper, etc., by making heat-fusible conjugate filaments containing a specific compound in a low-melting point component containing an ethylene-vinyl acetate copolymer or its saponified substance to a nonwoven cloth. SOLUTION: This filament nonwoven cloth is obtained by makign heat-fusible conjugate filaments (preferably sheath-core type or side-by-side type using the component A as a sheath component) derived from conjugation of (A) a blend containing a linear higher fatty acid expressed by the formula [Cn-1 H2(n-m)-1 COO<-> ]a X<a+> (n) is an integer of 10-30; (m) is a number of unsaturated bond in a fatty chain; X is H, Li, K, Na, Ca, Mg, Zn, Pb, Al, Ba or Cd; (a) is an ionic valence number} or its metal salt in an amount of 500-5,000wt.ppm as a concentration in the resultant fiber into a low melting point component containing an ethylene-vinyl acetate copolymer or its saponified substance with (B) a crystalline thermoplastic resin having a melting point higher than the component A to a nonwoven cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a long-fiber nonwoven fabric and an absorbent article using the same. In particular, the present invention includes a first component containing an ethylene-vinyl acetate copolymer or a saponified product thereof, and forming at least a part of the fiber surface in the length direction of the fiber, and having a higher melting point than the first component. The present invention relates to a heat-fusible composite long-fiber nonwoven fabric using the above-mentioned crystalline thermoplastic resin as a second component and an absorbent article using the same.

[0002]

2. Description of the Related Art Spunbonded nonwoven fabrics, which are typical examples of long-fiber nonwoven fabrics, introduce a group of long fibers discharged from a melt spinneret into an air soccer or the like, draw and stretch them, open them and collect them on a collection conveyor. After obtaining a long-fiber fleece, the long fibers are entangled or thermally fused between the long fibers by an appropriate means. Therefore, since long fibers, which can be called continuous fibers, are used as constituent fibers, mechanical properties such as tensile strength are superior to short fiber nonwoven fabrics using short fibers as constituent fibers. In addition, since long fibers obtained by melt spinning can be opened and accumulated as they are to obtain a nonwoven fabric, compared to nonwoven fabrics obtained by opening and accumulating short fibers by a dry method or a wet method,
There is an advantage that it can be produced rationally, and in recent years, its production has been greatly increased.

In particular, a resin containing an ethylene-vinyl acetate copolymer or a saponified product thereof as a first component is used,
The composite long-fiber nonwoven fabric using a crystalline thermoplastic resin as the second component, in addition to the above advantages as a long-fiber nonwoven fabric, is excellent in heat-fusibility and is easy to process. Compared to the case of using an olefin-based low-melting-point copolymer obtained by copolymerizing two or more olefins as components, a binder is not required because it is more excellent in heat-sealing properties with other dissimilar materials. If a nonwoven fabric can be obtained, the application field by adhesive lamination with other materials will be expanded, so that a significant increase in demand is expected.

[0004] Conventionally, absorbent articles such as disposable diapers and sanitary napkins such as disposable diapers of medical hygiene materials include:
Although slightly different depending on the mode, in order to absorb body fluids such as urine and blood and prevent leakage, at least a liquid absorbing layer that absorbs and retains body fluids such as urine and blood, and the surface side (the side in contact with the skin) A liquid-permeable front cover made of, for example, a nonwoven fabric, and a liquid-impermeable backsheet arranged on the back side surface to prevent the absorbed body fluid from leaking to the outside. . In addition, in general, in absorbent articles such as disposable diapers such as disposable diapers and sanitary napkins, in addition to the back sheet, the absorbent articles may be displaced from a predetermined wearing state due to body movement, or may lie down sideways. In order to prevent liquids such as absorbed body fluids from leaking, a side sheet made of a water-repellent sheet is provided on both sides of the absorbent article (in the case of disposable diapers, gathers are often provided. Also known as side gathers and leg cuffs,
In the case of a disposable diaper, the side sheet is provided at a position such that when the disposable diaper is worn, the thigh is worn or the user turns around the thigh and grips it. ) Is also provided, and in disposable diapers, liquids such as absorbed body fluids may fall on the skin side of the part that covers the abdomen and the upper part of the buttocks on the opposite side,
A water-repellent round sheet made of non-woven fabric etc. is also provided to prevent leakage to the outside of the absorbent article if it leaks to the abdomen or upper buttocks due to the movement of the wearer such as lying down or rotating the body Have been. Furthermore, in the case of disposable diapers, there is a waist gather etc. in the shape of a band on the waist position skin side,
These are also formed of a water-repellent sheet made of, for example, a nonwoven fabric.

[0005] In addition, the liquid absorbing layer is made by compressing and hardening a fiber assembly obtained by mixing cellulosic fibers such as fluff pulp and, if necessary, synthetic fibers and the like with a superabsorbent resin. Various liquid absorbing layers made of such materials are used. Usually, the liquid absorbing layer is wrapped with tissue paper or the like. Further, as the back sheet, a thermoplastic film is used, and the thermoplastic film has a myriad of fine holes in order to prevent stuffiness during wearing, and is generally provided with air permeability. is there. In addition, those which are combined with a nonwoven fabric from the viewpoint of improving the feel and appearance of the plasticity characteristic of the film and improving the strength are also used. When these constituent members are formed into absorbent articles such as disposable diapers and sanitary napkins, necessary parts of the respective members are thermally bonded with a hot melt adhesive.

[0006]

By the way, referring to the heat-fusible composite long-fiber nonwoven fabric, an ethylene-vinyl acetate copolymer or a saponified product thereof used as a heat-sealing component of the heat-fusible composite long-fiber nonwoven fabric Is reduced in crystallinity, melting point or softening point by an ethylene-vinyl acetate copolymer or a copolymer containing a saponified product thereof.

[0007] The ethylene-vinyl acetate copolymer or a copolymer containing a saponified product thereof has a relatively large friction resistance between fibers or between a fiber and a metal, although the size is large or small.

For this reason, when the yarn discharged from the spinning nozzle hole is pulled by a metal air soccer, fineness unevenness occurs due to friction between the fibers and the metal or between the fibers,
There was a problem that the fibers were bundled and it was difficult to open.

In the case where a resin having a reduced crystallinity is used, a time or a distance (solidification length) until the resin thread discharged in a molten state from the spinning nozzle hole crystallizes and solidifies. ) Is significantly longer.

[0010] Therefore, not only the filaments become bundles due to friction, causing unevenness of fineness or poor opening, but also the filaments having a longer solidified length are still melted by the fact that the distance between the filaments becomes shorter. Since the copolymer having a low melting point or a low softening point contacts in a molten state, so-called thread breakage occurs and the operability is poor.

Japanese Patent Application Laid-Open No. 5-5261 discloses a nonwoven fabric comprising a composite type long fiber of an ethylene-propylene random copolymer and isotactic polypropylene. However, here, means for solving the above-mentioned problem is not particularly shown. In addition, the above-described problems in a long-fiber nonwoven fabric composed of a composite fiber containing, as one component, an ethylene-vinyl acetate copolymer having a property different from that of an ethylene-propylene random copolymer or a copolymer containing a saponified product thereof. No solution to the point has been proposed.

As for the absorbent article, as described above, when each component is formed into an absorbent article such as a disposable diaper or a sanitary napkin, each component is bonded using a hot melt adhesive. However, the use of a hot melt adhesive increases the weight of the absorbent article and increases the cost. In addition, when conventional short-fiber nonwoven fabrics or the like are used as constituent members, these usually have an oil agent attached to the fiber surface, and have some influence on thermal adhesiveness such as heat sealing. Therefore, apart from members that require oil treatment such as imparting hydrophilicity, it is more preferable that members not requiring oil treatment are not treated with oil or the like. In addition, a long-fiber nonwoven fabric containing an ethylene-vinyl acetate copolymer or a copolymer containing a saponified product thereof as a component of a composite fiber has excellent heat adhesion to other materials, but has a slimy feeling by itself. There is also a problem that it is difficult to use an absorbent article that hits the skin.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a high adhesion containing an ethylene-vinyl acetate copolymer or a copolymer containing a saponified product thereof as one component of a conjugate fiber. A composite with good heat resistance and low-temperature adhesion, excellent adhesion to different materials, excellent texture and softness of the obtained long-fiber nonwoven fabric, excellent uniformity of the nonwoven fabric, and good operability such as spinnability. It is an object of the present invention to provide a long-fiber nonwoven fabric made of fibers.

Further, the present invention solves the problems of the above-mentioned conventional absorbent articles, and uses the long-fiber nonwoven fabric of the present invention having excellent heat adhesion for a part of the absorbent articles, thereby improving flexibility and airflow. It is an object of the present invention to provide an absorbent article in which the weight increase is reduced, the cost can be reduced, the adhesiveness with other members used is good, and the slimy feeling is reduced even when touching the skin without reducing the combination. It is the purpose.

As a result of extensive studies, the present inventors have found that by adding a specific linear higher fatty acid and / or a metal salt thereof to at least the first component which is a component having a low melting point or a low softening point, a fiber is obtained. Since the surface can be smoothed and the fibers can be prevented from sticking to each other during spinning, yarn breakage and the like can be reduced, operability can be improved, and the specific linear higher fatty acid and / or a metal salt thereof can be added. The crystallization temperature of the resin component of the first component containing the ethylene-vinyl acetate copolymer or a saponified product thereof hardly increases, and the increase in crystallinity is also remarkably small. Good fluidity of the resin component of the first component containing a vinyl acetate copolymer or a saponified product thereof,
Therefore, the resin component of the first component containing a low-melting point or low softening point ethylene-vinyl acetate copolymer or a saponified product thereof sufficiently exhibits characteristics such as flexibility and high adhesiveness, low-temperature adhesiveness, and the like. A long-fiber nonwoven fabric with good texture and feel and excellent adhesion with other members such as different materials can be obtained.
In addition, by using such a long-fiber nonwoven fabric as a part of an absorbent article, a portion using such a long-fiber nonwoven fabric can be easily bonded without using a hot-melt adhesive in a portion requiring joining. , And therefore less weight gain,
The present inventors have found that an absorbent article having a good feeling can be obtained at a low cost and without a feeling of sliminess due to the ethylene-vinyl acetate copolymer or a saponified component thereof, thereby completing the present invention.

[0016]

[Means for Solving the Problems]

(1) In order to achieve the above object, the long-fiber nonwoven fabric of the present invention contains an ethylene-vinyl acetate copolymer or a saponified product thereof, and forms at least a part of the fiber surface in the fiber length direction. A first component, and a heat-fusible conjugate long fiber having a crystalline thermoplastic resin having a higher melting point than the first component as a second component, and at least the first component is represented by the following chemical formula (A). Containing at least one compound selected from linear higher fatty acids or metal salts thereof, wherein the content of the compound is 500 to 5,000 wt.
pm.

[0017]

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(2) In the long-fiber nonwoven fabric of the present invention described in the above item (1), the composition of the ethylene-vinyl acetate copolymer or the saponified product thereof is based on the fraction of vinyl acetate and the saponified product thereof. It is preferably 5 to 40% by weight.

(3) In the long-fiber nonwoven fabric of the present invention described in the above (1) or (2), the resin component of the first component contains an ethylene-vinyl acetate copolymer or a saponified product thereof. Preferably, the rate is 5% by weight or more.

(4) In the long-fiber nonwoven fabric according to any one of the above (1) to (3), the resin component of the first component is an ethylene-vinyl acetate copolymer or a saponified product thereof. And a mixture of polyethylene and polyethylene.

(5) In the long-fiber nonwoven fabric according to any one of the above items (1) to (4), the crystalline thermoplastic resin as the second component is preferably polypropylene.

(6) In the long-fiber nonwoven fabric according to any one of the above items (1) to (4), the crystalline thermoplastic resin as the second component is preferably polyethylene terephthalate.

(7) In the long-fiber nonwoven fabric according to any one of the above items (1) to (6), the long-fiber nonwoven fabric may be a long-fiber nonwoven fabric obtained by a spun bond method. preferable.

(8) The absorbent article of the present invention is an absorbent article partially using the long-fiber nonwoven fabric according to any one of the above (1) to (7).

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The long-fiber nonwoven fabric according to the present invention contains an ethylene-vinyl acetate copolymer or a saponified product thereof, and has at least a part of the fiber surface formed in the length direction of the fiber. And a heat-fusible conjugate long fiber having a crystalline thermoplastic resin having a higher melting point than the first component as a second component, and at least a direct component represented by the following chemical formula (A) in the first component. A nonwoven fabric comprising a composite continuous fiber containing at least one compound selected from a chain higher fatty acid or a metal salt thereof, and having a compound content of 500 to 5,000 ppm by weight in the fiber.

[0026]

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The first component is a resin containing the ethylene-vinyl acetate copolymer or a saponified product thereof and forming at least a part of the fiber surface in the length direction of the fiber. As the composite fiber used as the second component,
The first component is a sheath component, the second component is a sheath-core composite fiber in which the core component is a core component, the so-called sheath-core eccentric composite fiber in which the position in the cross section of the core component is eccentric, the first component and the second component. A so-called side-by-side conjugate fiber (side-by-side conjugate fiber) in which two components are bonded to each other is preferably used.
In particular, it is preferable to use a sheath-core eccentric conjugate fiber or a side-by-side conjugate fiber, since a crimped fiber can be easily obtained and a bulky and comfortable long-fiber nonwoven fabric can be obtained. The ratio (composite ratio) of the first component and the second component in the cross-section of the side-by-side composite fiber may be 1: 1 so that one component occupies a larger cross-sectional area in the fiber cross-section than the other component. Of course, it is possible.

The volume ratio of the first component and the second component of the conjugate fiber (when a fiber cross section is employed, it corresponds to the area ratio of the cross section = composite ratio) is usually the ratio of the first component to the second component. 10:90 to 90:10, preferably 30:70 to 7
0:30 is used.

In the present invention, as the resin component of the first component, a resin containing an ethylene-vinyl acetate copolymer or a saponified product thereof is used. As the ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate copolymer having a vinyl acetate fraction (that is, a copolymerization ratio of a vinyl acetate component) of about 5 to 40% by weight is preferably used. Especially ethylene-
Although a vinyl acetate binary copolymer is preferably used, some other components may be copolymerized without departing from the object of the present invention. The ethylene-vinyl acetate copolymer having a vinyl acetate fraction of about 5 to 40% by weight does not have a too low melting point and does not have tackiness, and satisfies the necessary properties as a material constituting the fiber surface. In addition, the thermal stability is relatively good, so it is suitable with few problems of thermal decomposition and deterioration in melt spinning. In addition, thermal bonding with other dissimilar materials, which is a characteristic of ethylene-vinyl acetate copolymer It has excellent properties and is preferably used. The same applies to saponified products.

The ethylene-vinyl acetate copolymer used in the present invention may be used without saponification, or a saponified product thereof. The degree of saponification can be anything up to 100%. That is, a partially saponified product may be used. The saponified product has a slightly higher cost but a better feel. When a saponified product of an ethylene-vinyl acetate copolymer is used, the fraction (copolymerization ratio) of vinyl acetate and the saponified component is in the range of 5 to 40% by weight in terms of the total amount of both components. Are preferably used. In the above description, for example, when the saponification degree is 0%, "5 to 40% by weight" indicates the copolymerization ratio of vinyl acetate, and when the saponification degree is 100%, the copolymerization ratio of the saponified component is indicated. become.

In the resin component constituting the first component, the ethylene-vinyl acetate copolymer or a saponified product thereof is contained in an amount of 5% by weight or more based on the total weight of the resin component in the first component. Is preferable in order to maintain good low-temperature adhesion and adhesion to other foreign materials. The ethylene-vinyl acetate copolymer or a saponified product thereof can be used up to a ratio of 100% by weight based on the total weight of the resin components in the first component. And a resin having a relatively low melting point or a low softening point can be mixed and used.

Among the resins having a relatively low melting point or low softening point used in the first component by mixing with the ethylene-vinyl acetate copolymer or a saponified product thereof, polyethylene is preferred from the viewpoint of ensuring compatibility and low melting point temperature. And various types of polyethylene can be used, and low density polyethylene is particularly preferable. By using polyethylene together
This is preferable because friction with a metal such as air soccer described above during melt spinning can be further reduced and adhesion between fibers can be more suitably prevented.

As the first component containing the ethylene-vinyl acetate copolymer or a saponified product thereof used in the present invention, the first component is heat-melted or softened at a lower temperature than the crystalline thermoplastic resin of the second component, and the heat-fusing property is reduced. It is preferable that the temperature is at least 5 ° C., more preferably 3 ° C., above the temperature at which the crystalline thermoplastic resin of the second component melts or softens.
Those which can be thermally melted or softened at a temperature lower than 0 ° C. are preferable because they do not cause damage such as deterioration of physical properties due to heat to the second component when the obtained long fiber fleece is thermally fused.

The melting point or the softening point can be measured as the temperature at the top of the endothermic peak of the endothermic peak curve by DSC (inspection scanning calorimetry) at a heating rate of 10 ° C./min. The measurement of softening point is based on JIS K
2531.

As the crystalline thermoplastic resin of the second component used in the present invention, the melting point or the softening point is higher than the melting point or the softening point of the first component containing the ethylene-vinyl acetate copolymer or the saponified product thereof. Is high, a crystalline thermoplastic resin capable of complex spinning with the first component is used,
Preferably, polypropylene or polyethylene terephthalate is used. The use of polypropylene as the second component is preferable because a relatively flexible long-fiber nonwoven fabric can be obtained. Further, when polyethylene terephthalate is used as the second component, the strength is greater, and
It is preferable because a long-fiber nonwoven fabric having more excellent elasticity (cushioning property) when crimping can be obtained can be obtained.

The MFR (melt flow rate) of the resin used is not particularly limited, but the first component and the second component (provided that the second component is an olefin resin) are generally 10 to 10%. 100 g / 10 min is used.

As the linear higher fatty acid or its metal salt used in the present invention, those represented by the following general formula (A) are used.

[0038]

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In the above formula (A) of the above-mentioned linear higher fatty acid or its metal salt, when n is less than 10, external lubrication (smoothness of the fiber surface, that is, property of making the fiber surface slippery) ) Is less effective. As a general rough tendency, the larger the n is, the more effective the effect of imparting external lubrication is to be exhibited. However, those having an n of more than 30 are expensive because only synthetic products of fatty acids not occurring in nature are available. Not a target. In addition, m is not particularly limited, and those existing as linear higher fatty acids can be used. However, m is usually preferably in the range of 0 to 3. If the number of unsaturated bonds is too large, the weather resistance is lowered, and unnecessary reaction is caused by heat in the heat-melting step for melt-spinning. And so on, and the number of unsaturated bonds is preferably as small as possible. As the higher fatty acid or its metal salt, it is necessary to use a linear higher fatty acid or its metal salt in order to impart good external lubricity (smoothness to the fiber surface).

Specific examples of the linear higher fatty acid represented by the general formula (A) or a metal salt thereof include capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, and margarine. Acid, stearic acid, nonadecanoic acid, arachinic acid, heneicosanoic acid, behenic acid, tricosanoic acid, lignoceric acid, pentacosanoic acid, serotinic acid, heptacoic acid, montanic acid, nonacosanoic acid, melisic acid, caproleic acid, 9
-Undecylenic acid, lindelic acid, 2-tridecenoic acid, myristoleic acid, 6-pentadecenoic acid, 2-palmitoleic acid, 2-heptadecenoic acid, oleic acid, cis-9-nonadecenoic acid, gondoyic acid, erucic acid, seracoleic acid,
cis-17-hexacosenic acid, linoleic acid, linolenic acid and Li, K, Na, Ca, Mg, Z of these fatty acids
Metal salts selected from n, Pb, Al, Ba, and Cd are mentioned. In particular, as a metal salt, Ca, Mg or Zn salts are preferable because they are insoluble in water and do not irritate the skin when touched. Also, among the above fatty acids or metal salts thereof, stearic acid or its Ca, Mg or Zn salt is preferred because it is most easily available and inexpensive, easily added to the polymer, and has a sufficiently excellent lubricity-imparting effect. Particularly preferred.

The linear higher fatty acid or a metal thereof is
The resin component may be introduced from a side feeder provided in an extruder and kneaded and added together with the melt extrusion of the resin of the first component. Further, for example, it may be added in the form of a compound kneaded with the resin component of the first component or a master batch in advance. Moreover, you may add also to the resin of a 2nd component as needed.

These linear higher fatty acids or metal salts thereof impart smoothness (slipperiness) to the surface of the composite long fiber, and as a result, prevent sticking between the fibers during spinning, and provide a spun-bonded nonwoven fabric or the like. As described above, in the nonwoven fabric of composite long fibers, unevenness of fineness and spreadability are good, yarn breakage is improved, operability is good, and these linear higher fatty acids or metal salts thereof have a nucleating action. Small enough to ignore
Furthermore, the fluidity of the first component is improved by its internal lubrication,
The resin component containing the ethylene-vinyl acetate copolymer of the first component or a saponified product thereof can sufficiently exhibit characteristics such as flexibility, high adhesiveness, and low-temperature adhesiveness, and has a good texture such as flexibility and touch. Thus, a long-fiber nonwoven fabric having excellent adhesion to other members such as a foreign material can be obtained. In particular, in the case where the nonwoven fabric of the present invention is produced by an opening method utilizing static electricity, for example, a forced charging method or a triboelectric charging method, the linear higher fatty acid or its metal salt is more likely to be opened by an easily charged property. Thus, a nonwoven fabric with excellent properties and good formation can be obtained.

The linear higher fatty acid or its metal salt is added in an amount of 500 to 5000 ppm by weight in the fiber.
It is necessary to contain. If the addition amount is less than 500 ppm by weight, the effect of preventing adhesion between fibers during spinning by imparting smoothness is not sufficiently exhibited, and long fibers are bundled due to friction to cause unevenness of fineness and poor opening, or Cutting tends to occur and the operability tends to decrease.
If it is more than 0 ppm by weight, it acts as a foreign substance during spinning,
Conversely, yarn breakage occurs and causes a decrease in operability, so it is necessary to be within the above range.

The linear higher fatty acid and / or the metal salt thereof need to be added to at least the first component, and may be added to both the first component and the second component.

In the present invention, the concentration of the above-mentioned linear higher fatty acid and / or its metal salt in the fiber is not the concentration in one component of the conjugate fiber but the average in the entire conjugate fiber. The concentration was shown. Therefore, even if the linear higher fatty acid or its metal salt is added to only the first component, the concentration indicates the average concentration of the entire composite fiber composed of the first component and the second component.

In the present invention, the fineness of the composite long fiber constituting the nonwoven fabric is not particularly limited, and may be an appropriate fineness according to the type and use of the material resin used. It is preferably about 1 to 8 d / f. For example, when used for sanitary materials represented by disposable diapers, sanitary napkins, incontinence pads, surgical clothing, surgical hangers, haptics, etc.
d / f is preferred.

The basis weight of the long-fiber nonwoven fabric of the present invention is not particularly limited, and may be a nonwoven fabric having an appropriate basis weight according to the type and use of the material resin used, and preferably 10 to 50 g / m ^2.
About 10 to 30 especially when used for sanitary materials.
g / m ² is preferred.

The long filament nonwoven fabric according to the present invention can be obtained by using the resin composition as described above to obtain a composite filament from a die by melt spinning, and such a filament nonwoven fabric is well known. It can be easily manufactured by a conventional spun bond method.

The spunbond method is already well known and will not be described in detail. For example, a low-melting resin component containing an ethylene-vinyl acetate copolymer or a saponified product thereof and the aforementioned linear higher A mixture of a fatty acid and / or a metal salt thereof is prepared as a first component (if necessary, further various additives may be mixed), and a crystalline thermoplastic resin (a crystal containing various additives as necessary) May be used) as the second component. Each of these resin compositions is put into an individual extruder, and is melt-spun using a composite spinneret. A group of composite fibers discharged from a round solid spinneret (if necessary, other than a round solid nozzle may be used as a deformed or hollow base) is introduced into air soccer and drawn and stretched to form a composite filament group. Then, the long fiber group discharged from the air soccer is charged by applying the same charge to a suitable charging device such as a corona discharge device and charged, and then a pair of vibrating wings (flaps) is formed. The fiber is opened by passing through the gap, or the fiber is opened by colliding with an appropriate reflection plate or the like, and the opened fiber group is formed as a long fiber fleece on an endless net-shaped conveyor provided with a suction device on the back surface. Collect. The collected long fiber fleece is conveyed while being placed on an endless conveyor, and introduced between pressurized rolls of a point bond processing machine composed of a heated uneven roll and a smooth roll to remove the long fiber fleece. The first component is melted or softened in a region corresponding to the convex portion of the concave-convex roll to obtain a long-fiber nonwoven fabric in which long fibers are heat-sealed to each other. The basis weight of the long-fiber nonwoven fabric can be adjusted, for example, by adjusting the spinning discharge speed (discharge amount per time), the moving speed of the endless conveyor, and the like. The formation of the nonwoven fabric of the long fiber fleece (entanglement or heat fusion) is not limited to the point bond method, and may be performed by a hot air heating method, a high pressure water flow method, a needle punch method, an ultrasonic heating method, or the like. A plurality of combinations of these nonwoven fabric methods may be employed.

The long-fiber nonwoven fabric of the present invention is not limited to the one manufactured by the above-described method, but the spunbond method can easily produce a nonwoven fabric having excellent mechanical properties such as tensile strength. The resulting nonwoven fabric is obtained by opening and accumulating the long fibers obtained by melt-spinning as they are, and thus the productivity is very excellent and preferable.

The thus obtained long-fiber nonwoven fabric of the present invention has high adhesion, low-temperature adhesion, and good adhesion to different kinds of materials. A long-fiber nonwoven fabric made of a conjugate fiber with excellent uniformity and good operability such as spinnability can be obtained, so it can be used for various applications, especially when used by bonding or bonding with other materials, or When combined with other materials to form a composite material, it can be easily thermally bonded,
It can also be used effectively for the production of such composite materials.

Further, the long-fiber nonwoven fabric of the present invention can be used for a part of absorbent articles such as sanitary napkins and disposable diapers. Absorbent articles such as disposable diapers and sanitary napkins such as disposable diapers vary slightly depending on the mode, but at least absorb bodily fluids such as urine and blood to absorb and prevent leakage of bodily fluids such as urine and blood. A liquid absorbing layer to be retained, and a liquid-permeable front cover made of, for example, a nonwoven fabric disposed on the surface side (side in contact with the skin);
A liquid-impermeable back sheet is provided on the back side surface to prevent the absorbed body fluid from leaking to the outside. In addition, in general, in absorbent articles such as disposable diapers such as disposable diapers and sanitary napkins, in addition to the back sheet, the absorbent articles may be displaced from a predetermined wearing state due to body movement, or may lie down sideways. Water-repellent side sheet made of non-woven fabric etc. on both sides of the absorbent article to prevent leakage of absorbed liquids such as bodily fluids (in the case of disposable diapers, etc. It is also called side gathers or leg cuffs because there are many, and in the case of disposable diapers, the side sheet is provided at a position such that when wearing a disposable diaper, the thigh is attached or it turns around the thigh and grips it Etc.), and in disposable diapers, the part that covers the abdomen and the upper buttocks on the opposite side If fluid such as bodily fluids that have absorbed leaks into the abdomen or upper buttocks due to the movement of the wearer, such as falling down, laying down, or rotating the body, the absorbed fluid may fall outside the absorbent article. A water-repellent round sheet made of a nonwoven fabric or the like for preventing leakage is also provided. Furthermore, in the case of disposable diapers and the like, there is a waist gather or the like provided in a belt shape on the waist position skin side, and these are also formed of a water-repellent sheet such as a nonwoven fabric.

The liquid absorbing layer is made by compressing and solidifying a fiber assembly in which cellulosic fibers such as fluff pulp and, if necessary, synthetic fibers and the like are mixed with a highly water-absorbing resin. Various liquid absorbing layers made of such materials are used. This liquid absorbing layer is generally wrapped with tissue paper or the like. Further, as the back sheet, usually, a thermoplastic film is used, and the thermoplastic film has a myriad of fine holes to prevent internal stuffiness during wearing, and is generally provided with air permeability. It is a target. In addition, a film composited with a nonwoven fabric has been used from the viewpoint of improving the feel and appearance of the plastic characteristic of the film and improving the strength. In addition to the above, there is a case in which another sheet is further inserted to provide various functions, and the sheet has a multilayer structure.

The long-fiber nonwoven fabric according to the present invention may be used as a part of the front cover, side sheet, round sheet, back sheet (lamination with a liquid impermeable sheet, etc.) of these absorbent articles depending on the purpose. It can be used for an absorption layer or the like. When used for the liquid absorbing layer, for example, by inserting it in the middle of the liquid absorbing layer and thermally bonding, it does not significantly impair the absorption characteristics of the liquid absorbing layer, so that the body of the body while wearing weight is applied. The liquid absorbing layer can serve as a reinforcement to prevent the liquid absorbing layer from being collapsed due to stress caused by the movement. Necessary portions are appropriately heat-bonded and fixed between these members.

In the hot pressing and thermocompression bonding, although it depends on the part to be used, it is usually preferable to employ partial point bonding so that a large number of points can be bonded. With reference to the drawings, the long-fiber nonwoven fabric according to the present invention for an absorbent article will be described with reference to a typical example of what part of the absorbent article is used,
The illustrated structure of the absorbent article is an example, and does not mean that the absorbent article is limited to only the illustrated structure.

FIG. 1 is an exploded plan view of an example of a disposable diaper viewed from the skin side, FIG. 2 is a schematic end view of a cross section taken along line XX ′, and FIG. It is a schematic end view.

In FIGS. 1 to 3, reference numerals 1 and 1 'denote liquid absorbing layers for absorbing and retaining bodily fluids, and are not particularly limited. For example, cellulosic fibers such as fluff pulp; It is made of a material obtained by compressing and hardening a mixture of synthetic fibers as necessary. The liquid absorbing layers 1 and 1 'are wrapped in tissue paper (not shown) or the like. In this embodiment of the present invention, the reinforcing layer 6 made of the long-fiber nonwoven fabric of the present invention is inserted between the liquid absorbing layers 1 and 1 'to thermally bond the liquid absorbing layers 1 and 1'. It plays a role of reinforcement so that it does not collapse due to weight or body movement. Reference numeral 2 denotes a liquid-permeable front cover disposed on the surface side (side in contact with the skin). The long fiber nonwoven fabric of the present invention can also be used for the front cover 2. Reference numeral 3 denotes a back sheet which is required to have liquid impermeability. On the back side of the back sheet 3, the long fiber nonwoven fabric of the present invention is laminated as a back sheet laminate 8. By laminating on the back sheet of such an absorbent article, the cold feeling of the plastic film and the appearance peculiar to plastic can be improved, and the cloth-like warm feeling and appearance can be imparted, and the back sheet can be reinforced.

Although the round sheet 4 is not always necessary, FIGS. 2 and 3 show examples in which the round sheet 4 is provided between the liquid absorbing layer 1 ′ and the back sheet 3. As the round sheet 4, the long-fiber nonwoven fabric of the present invention can be used. 5 and 5 ′ are to prevent the liquid such as the absorbed body fluid from leaking when the absorbent article is displaced from a predetermined wearing state by the movement of the body or laid down sideways as described above. Side sheets on both sides of the absorbent article (in the case of disposable diapers, etc., it is often referred to as side gathers or leg cuffs, so in the case of disposable diapers, side sheets are disposable diapers Is provided at such a position as to attach the thighs when the user wears the thighs, or to grip the thighs around the thighs.). The long-fiber nonwoven fabric of the present invention can also be used for this side sheet. Although not particularly shown in FIGS. 2 and 3, a waist gather or the like may be provided in a belt shape on the skin side of the waist position shown as 7 in FIG. The long-fiber nonwoven fabric of the present invention can also be used for waist gathers. Although these members are not shown in the drawings, appropriate portions are thermally bonded so that they do not fall off. When the long-fiber nonwoven fabric of the present invention is used as the member to which the heat bonding is performed, the heat bonding can be performed without using the hot melt adhesive. As described above, the long-fiber nonwoven fabric of the present invention has a reduced slimy feeling because the specific higher linear fatty acid and / or its metal salt is added to the fiber material as described above. An article is obtained.

The portion where the long-fiber nonwoven fabric of the present invention is used may not be used for all the members described above, and may be one or more of them.
Next, FIG. 4 shows a developed plan view of an example of the sanitary napkin viewed from the skin side, and FIG. 5 shows a schematic end view of a cross section taken along the line XX ′. 1, 1 'is a liquid absorbing layer wrapped in a tissue paper (not shown), 2 is a liquid-permeable front cover arranged on the surface side (side in contact with the skin), 3 is a liquid non-permeable surface. The required backsheet. Reference numerals 5 and 5 'denote side seats. In this embodiment of the present invention, the reinforcing layer 6 made of the long-fiber nonwoven fabric of the present invention is inserted between the liquid absorbing layers 1 and 1 'to thermally bond the liquid absorbing layers 1 and 1' to each other. However, it plays a role of reinforcement so that it does not collapse due to weight or body movement. The long-fiber nonwoven fabric of the present invention is laminated on the back side of the backsheet 3 as a backsheet laminate 8, and the longfiber nonwoven fabric of the present invention is also used for the side sheets 5, 5 '.

Although these members are not shown in the drawings, appropriate parts are adhered so that they do not fall off. When the long-fiber nonwoven fabric of the present invention is used for a member requiring heat bonding, heat bonding can be performed without using a hot melt adhesive. As described above, the long-fiber nonwoven fabric of the present invention also has a reduced slimy feeling, and an absorbent article having a good texture can be obtained.

Of course, the portion where the long-fiber nonwoven fabric of the present invention is used may not be used for all of the members described above, and any one or more of them may be used as described above. Same as in the case.

The long-fiber nonwoven fabric of the present invention has a reduced slimy feeling, and an absorbent article having a good texture can be obtained. When the long-fiber nonwoven fabric of the present invention is used for a member requiring bonding, heat bonding can be easily performed without using a hot-melt adhesive, so that weight increase is small and low-cost absorption is achieved. An opaque article is obtained.

[0063]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to only those listed in these Examples.

Examples 1 to 13 and Comparative Examples 1 to 4 Ethylene-vinyl acetate binary copolymers shown in Table 1 or saponified products thereof alone or mixed resins containing the above copolymers (resins mixed with the above resins) Is a low density polyethylene
Inside, it is abbreviated as LDPE. ) And a linear higher fatty acid and / or a metal salt thereof shown in Table 1 were prepared as the first component. The types of linear higher fatty acids and / or metal salts thereof in Table 1 are shown by specifying specific examples of atoms represented by n and m and X in the chemical formula (A).

The amounts of linear higher fatty acids and / or metal salts thereof shown in Table 1 are indicated by the fiber concentration as defined above. Therefore, the concentration of the linear higher fatty acid and / or its metal salt only in the first component is higher than the concentration shown in the table. (The concentration of the linear higher fatty acid and / or its metal salt only in the first component can be easily calculated from the fiber concentration and the compounding ratio.) In addition, the ethylene-vinyl acetate binary copolymer of Example 13 was saponified, and the degree of saponification was 80%. In this case, the vinyl acetate fraction is a value including the saponified portion. As the second component, a crystalline thermoplastic resin having the properties shown in Table 1 was prepared. In Table 1, PP indicates polypropylene, and PET indicates polyethylene terephthalate.

Each of these resin compositions was individually
mm φ extruder, the first component side extrusion temperature 220 ° C
In the case of polypropylene, the second component side has an extrusion temperature of 2
The extruder was extruded at 50 ° C. and at an extrusion temperature of 280 ° C. in the case of polyethylene terephthalate. The first component,
The total amount of the two components is 2200 according to the composite ratio of the second component.
cc / min (specifically, the composite ratio A / B of the first component (A) and the second component (B) is 50/5
In the case of 0, the extrusion ratio of the first component is 1100 cc /
And the extrusion rate of the second component is 1100 cc / min), using a parallel type, sheath-core type or sheath-core eccentric type spinneret as described in the column of the composite mode in Table 1. And melt spun. The spinneret has a hole diameter of 0.35 mm
Having a circular spinning hole of 550 × 3 rows in the longitudinal direction of the die. The fiber group discharged from the spinneret was introduced into an air soccer and drawn and stretched to obtain a long fiber group.
Subsequently, the group of long fibers discharged from the air soccer was charged with the same charge by a corona discharge device, charged, and then passed between a pair of vibrating blades to open.
The opened filament group was collected as a filament fleece on an endless conveyor provided with a suction device on the back surface. At this time, the drawing / drawing speed of the air soccer was appropriately adjusted depending on the type of the fiber so that the fineness of the long fiber was 2.2 d / f.
The concentration of the inorganic powder in the fiber was as shown in the table. The collected long fiber fleece was conveyed while being placed on an endless conveyor, and introduced between pressurized rolls of a point bond processing machine composed of a heated uneven roll and a smooth roll. The introduced long-fiber fleece obtained a long-fiber nonwoven fabric in which the first component was melted or softened in the area corresponding to the convex portion of the concavo-convex roll, and the long fibers were heat-sealed to each other. The endless conveyor moving speed is set to 50 depending on the type of fiber so that the basis weight of this long-fiber nonwoven fabric is 28 g / m ^2.
m / min. Was adjusted before and after the reference. In addition,
The peripheral speed of the uneven roll was the same as the moving speed of the endless conveyor. The setting of the linear pressure between the rolls and the temperature of the rolls is performed by setting the bending resistance of the long-fiber nonwoven fabric (45 ° in the A method of JIS L 1096)
Conforms to the cantilever method, but the sample size is 5cm x 1
It was 5 cm. ) Has an average value of 30 m in the vertical and horizontal directions
m was set appropriately.

In the examples, all the nonwoven fabrics (thermal fusion between long fibers) were performed by the point bond method for adjusting the conditions at the time of the sensory test, but the hot air heating method, the high pressure water flow method, the needle It may be performed by a punch method, an ultrasonic heating method, or the like, and may be a combination of a plurality of these nonwoven fabric methods.

When polypropylene is used as the second component, MFR (melt flow rate: JIS K)
7210 was used under conditions 14 in Table 1) of 35. When polyethylene terephthalate was used as the second component, the one having an IV (intrinsic viscosity) value of 0.64 was used. The IV value was measured at 20 ° C. using an equal weight mixture of phenol and ethane tetrachloride as a solvent.
Was measured.

In Table 1, the LDP of the mixed resin of the first component is shown.
E means low-density polyethylene as described above, PP as the second component means polypropylene, and PET means polyethylene terephthalate. Also, the volume ratio A / B in the column of the composite ratio
A indicates the numerical value of the first component, B indicates the numerical value of the second component,
It is set to 100 for the entire composite fiber.

Table 2 shows the evaluation results of the long-fiber nonwoven fabric obtained as described above. Further, a wearing test was performed using the long-fiber nonwoven fabric of the present invention obtained in Examples 1 to 13 for an absorbent article.

(1) The long-fiber nonwoven fabric obtained in Example 1 was used as a front cover 2 of a disposable diaper. At this time,
50% polyethylene glycol dimethyl laurate (molecular weight 400) and 50% polyethylene glycol monolaurate (molecular weight 500) to impart liquid permeability
Was adhered to a 0.5% by weight nonwoven fabric. The front cover was heat-sealed to a back sheet made of a linear low-density polyethylene film and a tissue paper surrounding the liquid absorbing layer. When a wearing test was performed on the obtained disposable diaper, a good absorbent article having a good texture, no liquid leakage, and no displacement of the liquid absorbing layer was obtained.

Here, the disposable diaper includes the above-mentioned front cover, a liquid absorbing layer made of fluff pulp and a highly water-absorbent resin and wrapped in tissue paper, a side sheet of a polypropylene long-fiber nonwoven fabric, a polypropylene long-fiber nonwoven fabric. And a back sheet of a linear low-density polyethylene film.

(2) The long-fiber nonwoven fabric obtained in Example 2 was used as a side sheet of a disposable diaper. The side sheet was heat-sealed to a front cover made of polypropylene short fiber non-woven fabric and a round sheet made of polypropylene long fiber non-woven fabric. When a wearing test was performed on the obtained disposable diaper, a good absorbent article having a good texture and no liquid leakage was obtained.

Here, the disposable diaper includes a front cover made of short fiber non-woven fabric made of polypropylene, a liquid absorption layer made of fluff pulp and a highly water-absorbent resin and wrapped in tissue paper, the above-mentioned side gathers, and a long fiber non-woven fabric made of polypropylene. And a back sheet of a linear low-density polyethylene film.

(3) The long-fiber nonwoven fabric obtained in Example 3 was used as a round sheet of a disposable diaper. The round sheet was heat-sealed to a front cover made of polypropylene short fiber nonwoven fabric. When a wearing test was performed on the obtained disposable diaper, a good absorbent article having a good texture and no liquid leakage was obtained.

Here, the disposable diaper includes a front cover made of short fiber non-woven fabric made of polypropylene, a liquid absorbing layer made of fluff pulp and a highly water-absorbent resin and wrapped in tissue paper, a side sheet made of long fiber non-woven fabric made of polypropylene, And a back sheet of a linear low-density polyethylene film.

(4) The long-fiber nonwoven fabric obtained in Example 4 was used as a backsheet laminate of a disposable diaper.
The backsheet laminate was heat-sealed to a linear low-density polyethylene film. When a wearing test was performed on the obtained disposable diaper, an absorbent article having a good texture and a good appearance was obtained.

The disposable diaper is made of a polypropylene short-fiber non-woven fabric front cover, a liquid absorbing layer made of fluff pulp and a highly water-absorbent resin and wrapped in tissue paper, a polypropylene long-fiber non-woven fabric side sheet, polypropylene Round sheet of long-fiber nonwoven fabric,
It comprises a back sheet of a linear low-density polyethylene film and the above-described back sheet laminate.

(5) The long-fiber nonwoven fabric obtained in Example 5 was used as a waist gather of a disposable diaper. The waist gather was heat-sealed to a round sheet of polypropylene long fiber nonwoven fabric. When a wearing test was performed on the obtained disposable diaper, a good absorbent article having a good texture and no liquid leakage was obtained.

Here, the disposable diaper includes a front cover made of polypropylene short fiber non-woven fabric, a liquid absorbing layer made of fluff pulp and a highly water-absorbent resin and wrapped in tissue paper, a polypropylene long fiber non-woven fabric side sheet, polypropylene Round sheet of long-fiber nonwoven fabric,
It comprises a back sheet of a linear low density polyethylene film and the above-mentioned waist gather.

(6) The long-fiber nonwoven fabric obtained in Examples 6 and 7 was used as a part of a liquid absorbing layer of a disposable diaper. As shown in FIG. 2, the long fiber nonwoven fabric of the present invention was inserted between the fluff pulp and the liquid absorbing layers 1 and 1 'made of a highly water-absorbent resin and heat sealed. Then, the outside of the obtained liquid absorbing layer was wrapped with tissue paper. When a wear test was performed on the obtained disposable diaper, a good absorbent article was obtained without any collapse of the liquid absorbing layer and no liquid leakage.

Here, the disposable diaper includes a polypropylene short-fiber non-woven fabric front cover, the above-mentioned liquid absorbing layer, a polypropylene long-fiber non-woven fabric side sheet, a polypropylene long-fiber non-woven fabric round sheet, a linear low-density non-woven fabric. It consists of a polyethylene film backsheet.

(7) The long-fiber nonwoven fabric obtained in Example 8 was used as a front cover of a sanitary napkin. At this time, in order to impart liquid permeability, a hydrophilic oil agent composed of 50% of polyethylene glycol dimethyl laurate (molecular weight: 400) and 50% of polyethylene glycol monolaurate (molecular weight: 500) is added to a 0.5% by weight nonwoven fabric. Attached. The front cover was heat-sealed to a back sheet of a linear low-density polyethylene film and a tissue paper surrounding the liquid absorbing layer. When the obtained sanitary napkin was subjected to a wear test, a good absorbent article having a good texture, no liquid leakage, and no displacement of the liquid absorbing layer was obtained.

Here, the sanitary napkin is composed of the above-mentioned front cover, a liquid absorbing layer made of fluff pulp and a highly water-absorbent resin and wrapped in a tissue paper, a side sheet of a polypropylene long-fiber nonwoven fabric, a linear It consists of a low density polyethylene film backsheet.

(8) The long fiber nonwoven fabric obtained in Example 9 was used as a side sheet of a sanitary napkin. The side sheet was heat-sealed to a front cover made of a polypropylene short fiber nonwoven fabric. When a wearing test was performed on the obtained sanitary napkin, a good absorbent article having a good texture, no liquid leakage, and a good absorbability was obtained.

Here, the sanitary napkin is made of a front cover made of nonwoven polypropylene nonwoven fabric, a liquid absorbing layer made of fluff pulp and a highly water-absorbing resin and wrapped in tissue paper, the above-mentioned side sheet, and a linear It consists of a low density polyethylene film backsheet.

(9) The long-fiber nonwoven fabric obtained in Examples 10 and 11 was used as a backsheet laminate of a sanitary napkin. The backsheet laminate was heat-sealed to a linear low-density polyethylene film. When the obtained sanitary napkin was subjected to a wearing test, an absorbent article having a good texture and a good appearance was obtained.

Here, the sanitary napkin is a front cover made of polypropylene short fiber non-woven fabric, a liquid absorbing layer made of fluff pulp and superabsorbent resin and wrapped in tissue paper, and a side sheet made of polypropylene long fiber non-woven fabric. And a backsheet of a linear low-density polyethylene film and the backsheet laminate described above.

(10) The long-fiber nonwoven fabric obtained in Examples 12 and 13 was used as a part of a liquid absorbing layer of a sanitary napkin. As shown in FIG. 4, the long-fiber nonwoven fabric of the present invention was inserted between the fluff pulp and the liquid absorbing layers 1 and 1 'made of a highly water-absorbent resin and heat-sealed. Then, the outside of the obtained liquid absorbing layer was wrapped with tissue paper. When the obtained sanitary napkin was subjected to a wearing test, a good absorbent article was obtained without collapse of the liquid absorbing layer and no liquid leakage.

Here, the sanitary napkin is made of a polypropylene short fiber non-woven fabric front cover, the above-mentioned liquid absorbing layer, a polypropylene long fiber non-woven fabric side sheet, and a linear low density polyethylene film back sheet. It becomes. The measuring methods and evaluation criteria for each evaluation item are as follows.

(Tensile strength): Tensile strength tensile test was conducted in accordance with JIS L 1096 to measure the tensile strength in the longitudinal and transverse directions, and the value obtained by dividing the tensile strength by the basis weight and the sample width was used as the tensile strength in the longitudinal and transverse directions. did. This is (the tensile strength in the longitudinal direction ×
(Tensile strength in the transverse direction) was substituted into the formula of ^1/2 , and calculated as the tensile strength. Here, the vertical direction is a so-called machine direction in which long fibers are conveyed by an endless conveyor, and the horizontal direction is a direction orthogonal to the machine direction. The unit is shown in kg / cm (g / m ² ), but the meaning of (g / m ² ) in parentheses means a value converted per unit weight of the nonwoven fabric.

(Uniformity index of long fiber nonwoven fabric): 5 × 5c
m samples were taken at equal intervals at five points in the lateral direction of the nonwoven fabric, and each was cut into 1 cm squares and weighed. From this, ((maximum value) − (minimum value)) × 100 / (average value) was calculated for each of the five samples, and the average value was calculated. It was used as a measure of spread variability and fineness variability. It can be considered that the smaller the value is, the higher the uniformity is.

(Hand): 10 monitors conducted a sensory test by touching the surface of the long-fiber nonwoven fabric, and when they felt that the skin was good, they were given 1 point per person. (Spinnability): Melt spinning was performed for 3 hours, and the number of occurrences of yarn breakage was measured. When the number of yarn breaks is 3 or less, the spinnability can be considered to be good.

(Heat-sealability <peel strength>) The samples (long-fiber nonwoven fabric) obtained in each of the examples and comparative examples and a polypropylene long-fiber nonwoven fabric (having a basis weight of 20 g / m ² ) each had a size of 10 cm × 2.5 cm. Cut to size. The samples are overlapped so that the four corners thereof are aligned, and a thin and long heat seal is applied in the short side direction, that is, the width direction of the overlapped samples. The heat-sealing position is 2 mm from the part 1 cm in the longitudinal direction from one end of the short side of the superimposed sample.
It is the part to the inside of cm. That is, a 1-cm-wide blank portion without heat sealing was provided in parallel with the short side from one end of the short side of the sample, and a 1-cm-wide heat seal was performed adjacent to the blank portion and parallel to the short side. The heat sealing condition is a temperature of 12
0 ° C. (both upper and lower), 3 kg / cm ² , 3 seconds. As a heat sealing device, “Heat Seal Tester TP-7
01 "(manufactured by Tester Sangyo Co., Ltd.).

The tensile test sample obtained by the above operation was opened from the short side of the other end on which the heat sealing was not performed, and each end was set at an interval of 10 cm (“RDM”). -100 "(made by Orientec Co., Ltd.) so as not to be twisted. The peel strength was measured at a pulling speed of 100.
mm / min, and the peel strength is calculated according to JIS L
1086-1983.

[0096]

[Table 1]

[0097]

[Table 2]

[0098]

【The invention's effect】

(1) The long-fiber nonwoven fabric of the present invention improves the shortcomings of the conventional long-fiber nonwoven fabric, has high adhesiveness and good low-temperature adhesiveness, and has a texture such as flexibility and touch of the obtained long-fiber nonwoven fabric and uniformity of the nonwoven fabric. It is possible to provide a long-fiber nonwoven fabric made of a conjugate fiber which has excellent operability and good operability such as spinnability, and its industrial value is extremely large. That is, at least one compound selected from the linear higher fatty acids represented by the chemical formula (A) or a metal salt thereof is added to the first component, which is a component having a low melting point or a low softening point, in a fiber concentration. 500 to 5
By adding 2,000 ppm by weight, the fiber surface can be smoothed and the fibers can be prevented from sticking to each other during spinning, so that yarn breakage and the like are reduced, operability is improved, and the linear higher fatty acid and And / or the addition of the metal salt hardly raises the crystallization temperature of the resin component of the first component, significantly increases the degree of crystallinity, and the fluidity of the resin component of the first component due to its internal lubricity. Therefore, the characteristics of the resin component containing an ethylene-vinyl acetate copolymer or a saponified product thereof such as low melting point or low softening point flexibility and high adhesion, low temperature adhesion, etc. It is possible to provide a long-fiber nonwoven fabric having a good texture such as texture and feel, and excellent adhesion to different materials as well as materials of the same kind.

(2) In the long-fiber nonwoven fabric of the present invention, the composition of the ethylene-vinyl acetate copolymer or the saponified product thereof is 5% in terms of the fraction of vinyl acetate and the saponified product thereof.
By adopting a preferred embodiment of the present invention of from 40 to 40% by weight, the melting point of the copolymer is not too low, the thermal stability is good, and the melt-spinning can be performed without deterioration, thermal deterioration, and the like. In addition, it has excellent thermal adhesion to other dissimilar materials. In addition, it is possible to provide a long-fiber nonwoven fabric which can exhibit the softness peculiar to the copolymer satisfactorily, has good texture such as flexibility and touch, and has excellent adhesiveness to not only the same kind of material but also different kinds of materials.

(3) In the long-fiber nonwoven fabric of the present invention, the content of the ethylene-vinyl acetate copolymer or the saponified product thereof in the resin component of the first component is 5% by weight or more. By adopting a preferred embodiment, low-temperature adhesiveness and thermal adhesiveness to other different materials can be stably exhibited, which is preferable. In addition, the softness unique to the copolymer can be favorably exhibited, and a long-fiber nonwoven fabric having an excellent feeling can be provided.

(4) Further, in the long-fiber nonwoven fabric of the present invention, a preferred embodiment of the present invention is that the resin component of the first component is an ethylene-vinyl acetate copolymer or a mixture of a saponified product thereof and polyethylene. By using polyethylene in combination, friction with a metal such as air soccer described above during melt spinning can be further reduced, and adhesion between fibers can be more preferably prevented, which is preferable.

(5) In the long-fiber nonwoven fabric according to the present invention, a relatively flexible long-fiber nonwoven fabric can be obtained by adopting a preferred embodiment of the present invention in which the crystalline thermoplastic resin of the second component is polypropylene. Is preferred.

(6) In the long-fiber nonwoven fabric of the present invention, by setting the crystalline thermoplastic resin of the second component to the preferred embodiment of the present invention in which polyethylene terephthalate is used, the strength is increased and the crimp is increased. This is preferable because a long-fiber nonwoven fabric having more excellent elasticity (cushioning property) when the above is exhibited can be obtained.

(7) In the long-fiber non-woven fabric of the present invention, the long-fiber non-woven fabric is a long-fiber non-woven fabric obtained by a spun bonding method. A nonwoven fabric having excellent non-woven fabric properties can be easily obtained, and the filaments obtained by melt-spinning can be spread and accumulated as it is to obtain a nonwoven fabric. This is particularly preferable because the conventional effect of the composite long-fiber nonwoven fabric obtained by the spunbonding method can be effectively improved, and the conventional disadvantages can be effectively exhibited.

(8) The absorbent article of the present invention uses a long-fiber nonwoven fabric having excellent heat-adhesive properties according to the present invention as a part of the absorbent article, so that the weight and weight can be increased without lowering flexibility and feeling. It is possible to provide an absorbent article that is reduced in cost, can be reduced in cost, has good thermal adhesion to other members used, and has a reduced slimy feeling even when touching the skin.

[Brief description of the drawings]

FIG. 1 is a developed plan view of an example of a disposable diaper partially using the long-fiber nonwoven fabric of the present invention as viewed from the skin side.

FIG. 2 is a schematic end view of a cross section taken along line XX ′ of FIG. 1;

FIG. 3 is a schematic end view of a cross section taken along the line YY ′ of FIG. 1;

FIG. 4 is a developed plan view of an example of a sanitary napkin partially using the long-fiber nonwoven fabric of the present invention as viewed from the skin side.

FIG. 5 is a schematic end view of a cross section taken along line XX ′ of FIG. 4;

[Explanation of symbols]

 1, 1 'liquid absorbing layer 2 front cover 3 back sheet 4 round sheet 5, 5' side sheet 6 reinforcing layer 7, 7 'waist gather 8 back sheet laminate

Claims (8)

[Claims] 1. A first component containing an ethylene-vinyl acetate copolymer or a saponified product thereof and forming at least a part of the fiber surface in the length direction of the fiber, and a higher melting point than the first component. Selected from linear higher fatty acids represented by the following general formula (A) or metal salts thereof in at least the first component: At least one compound,
The content of the compound is 500 to 500 in the fiber concentration.
A long-fiber nonwoven fabric characterized by being 0 ppm by weight. Embedded image 2. The long-fiber nonwoven fabric according to claim 1, wherein the composition of the ethylene-vinyl acetate copolymer or the saponified product thereof is 5 to 40% by weight in terms of the fraction of vinyl acetate and the saponified product thereof. 3. The long-fiber nonwoven fabric according to claim 1, wherein the content of the ethylene-vinyl acetate copolymer or a saponified product thereof in the resin component of the first component is 5% by weight or more. 4. The long-fiber nonwoven fabric according to claim 1, wherein the resin component of the first component is an ethylene-vinyl acetate copolymer or a mixture of a saponified product thereof and polyethylene. 5. The long-fiber nonwoven fabric according to claim 1, wherein the crystalline thermoplastic resin of the second component is polypropylene. 6. The long-fiber nonwoven fabric according to claim 1, wherein the crystalline thermoplastic resin of the second component is polyethylene terephthalate. 7. The long-fiber nonwoven fabric according to claim 1, wherein the long-fiber nonwoven fabric is a long-fiber nonwoven fabric obtained by a spun bond method. 8. An absorbent article partially comprising the long-fiber nonwoven fabric according to claim 1.