JPH10167928A - Skin clean sheet - Google Patents

Abstract

(57) [Problem] To provide a skin cleaning sheet which is easy to stick to a curved surface, has excellent adhesion, does not have film breakage or skin residue when peeled off, and has an excellent effect of removing dirt such as prisms. SOLUTION: This film comprises a film-forming polymer base layer and a support layer, and the base layer contains polyvinylpyrrolidone having an intrinsic viscosity K value of 25 to 100, or further contains a polyol,
A skin cleaning sheet containing at least one of silicic anhydride and titanium oxide, wherein the support layer is a nonwoven fabric of a spunbond method comprising 10 to 70 g / m ² of polyolefin-based fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a peel-off type skin cleaning sheet.

[0002]

2. Description of the Related Art Conventionally, packs have been used to replenish the skin with moisture, moisturizing agents, emollients, etc., or to give the skin adequate tension to temporarily increase skin temperature and improve blood circulation, or to cleanse the skin. Used for the purpose. For these purposes, various types of peel-off types that peel off after drying, and wiping or rinsing types have been developed. In particular, in order to achieve the purpose of cleansing the skin, a film-forming cosmetic is applied to the skin, left for a certain period of time to form a film on the skin surface, and then the film is peeled off and removed from the skin. Peel-off type packs are widely used. As a dosage form, a jelly-like or paste-like one that is applied to the skin surface with a finger, or a powdery one that is dissolved and applied with water or the like when used is common. These dosage forms have disadvantages such as uneconomical and difficult to apply evenly because a large amount of the pack remains on the finger, and the film is broken or left on the skin when peeled off.

[0003] In recent years, sheet-like packs have been devised to solve these problems. For example, an adhesive sheet type in which an adhesive is spread on paper or a plastic sheet is commercially available. These have the feature that they do not need to be dried when used and are easy to use, and although old keratin on the skin surface and dirt exposed on the surface can be removed,
Since the adhesive does not reach the crevices and pores, it is not possible to remove horn plugs that cause dirt and acne in details.

On the other hand, an adhesive sheet-like pack agent (registered publication No. 1512942) in which an adhesive gel in which water is emulsified in an oily continuous phase is applied to a nonwoven fabric, a crosslinked hydrogel using polyacrylic acid and a crosslinking agent ( JP-A-58-180408, JP-A-61-260007, JP-A-1-254
612), a film provided with a dried thin layer of paste such as sodium polyacrylate or CMC or a thin layer in which fine powder of paste is dispersed (JP-A-60-165902); One using a water-containing gel containing a polymer and a crosslinking agent (JP-A-2-145505), one using a combination of polyvinyl alcohol, another water-soluble polymer and a polyhydric alcohol (JP-A-5-194180), One having a water content of 25% or less by combining sodium alginate and a polyhydric alcohol (JP-A-6-6504)
No. 8), a film-forming cosmetic containing a polymer having a salt-forming group, etc. impregnated in a moisture-permeable base (Japanese Unexamined Patent Publication No.
No. 330575) has been proposed.

[0005] Compared with the conventional jelly-like or paste-like packs or powder-like packs which are dissolved in water at the time of use, a large amount of these packs remains on the fingers. Although problems such as uneconomical, difficult to apply uniformly, and tearing of the film upon peeling and remaining on the skin have been improved, they have not been sufficient yet. In addition, there is a disadvantage that the effect of removing dirt is weak, and in particular, the effect of removing dirt on details such as skin grooves and keratin plugs causing acne is inferior.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a large amount of a film-forming polymer base remains on a finger, which is uneconomical and difficult to apply evenly. When peeled, the film is broken or remains on the skin. The present invention provides a skin cleaning sheet that eliminates the drawbacks of conventional peel-off type packs, such as scumming, and is excellent in the effect of removing dirt, in particular, the effect of removing dirt in details such as skin grooves and horn plugs that cause acne. The purpose is to:

[0007]

According to the present invention, there is provided a film-forming polymer base layer and a support layer for holding the base layer, wherein the film-forming polymer base layer has an intrinsic viscosity K value. Is 25-1
Of polyvinylpyrrolidone, and the support layer is 10
A skin cleaning sheet is provided, which is a nonwoven fabric made of a polyolefin-based fiber of up to 70 g / m ^{2 by} a spunbond method. Further, according to the present invention, the following components (a) and (b) are contained in the film-forming polymer base.
The skin cleaning sheet according to claim 1, wherein one or more kinds selected from the component and the component (c) are blended. (A) one or more selected from diols, triols or tetraols having 3 to 5 carbon atoms; (b) silicic anhydride; (c) titanium oxide

The present inventors have conducted intensive studies to solve the drawbacks of the conventional peel-off type pack, and as a result, they have used a specific polyvinylpyrrolidone as the film-forming polymer of the pack and a specific support as the support. It has been found that the use of the nonwoven fabric solves the conventional problems and that a skin cleansing sheet having an excellent skin cleansing effect can be obtained, thereby completing the present invention.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.
You. In the skin cleaning sheet of the present invention, the film-forming property is high.
Unique as a film-forming polymer contained in the molecular base layer
Using polyvinylpyrrolidone having a viscosity K value of 25 to 100
You. Here, the intrinsic viscosity K value is determined by Fikenscher.
It is a value defined by the following equation that is a modified version of the equation. (Where Z is the flow time of distilled water at 25 ° C.)
Flow of aqueous solution of polyvinylpyrrolidone with concentration C (w / v%)
Represents the kinetic time (relative viscosity). )

In general, when a skin-cleaning sheet is used, a face such as a nose is held in a state in which a film-forming polymer base layer which is a viscous solution or dispersion of a film-forming polymer is held on a support layer. After affixing to a part of the face or the entire face, or to a part of the back, elbow or the like where dirt or acne is concerned, and drying, the agent is peeled off. Alternatively, while the viscous solution or dispersion of the film-forming polymer is dried in advance and the film-forming polymer base layer is held on the support layer, the site to be subjected to the above-mentioned cleaning treatment is treated with water. After being wet with alcohol, hydrous alcohol, lotion, etc., it is adhered, dried and peeled off.

From the above method of using the skin-cleaning sheet, it is essential that the polymer used as the film-forming base be water-soluble. Many water-soluble polymers are known, and in particular, polyvinylpyrrolidone has water solubility and is always secreted into the epidermis and sebum and keratin plugs clogging pores (solidified sebum and keratin) It has a high affinity with dirt to be removed and has an excellent skin cleaning effect. Further, those having an intrinsic viscosity K value of 25 to 100, preferably 40 to 90 have excellent skin cleansing effects, and the formed film has extremely excellent properties as a pack. That is, when the intrinsic viscosity K value of polyvinylpyrrolidone is lower than 25, the dried film becomes brittle and cracks. When the K value is higher than 100, especially when using a film-forming polymer base layer which has been dried in advance, the film is too hard to adhere to a curved portion such as nose, back, and elbow. Hateful.

The blending amount of polyvinyl pyrrolide is preferably 50 to 100% by weight, more preferably 75 to 95% by weight, based on all components except for water and other volatile components. If the amount is too small, a sufficient effect of removing dirt cannot be obtained.

Next, as a support of the skin cleaning sheet of the present invention, a spunbonded nonwoven fabric composed of 10 to 70 g of polyolefin fiber per m ² is used. In general, the conditions required for the support layer of the skin-cleaning sheet are that the film-forming polymer base liquid does not exude to the back during manufacturing,
It has sufficient flexibility to fit a curved surface such as a face at the time of application, does not significantly affect the drying speed, and has sufficient strength to withstand without tearing when peeled from the skin. In addition, substances that may cause safety problems such as elution of irritants should be avoided. As the material of the nonwoven fabric, there are various materials such as polyolefin, acrylic, and cellulosic materials. The material that satisfies the conditions required for the support layer of the above-mentioned skin cleaning sheet is a polyolefin material.

Various nonwoven fabric production methods such as spunlace, thermal bond, chemical bond, needle punch, and spunbond have been developed, and the performance of the nonwoven fabric differs depending on the production method as follows. 1) Spunlace produced by entanglement of fibers with a high-pressure water stream has low tensile strength. 2) Thermal bonds manufactured by bonding fibers by partially melting them in a high-temperature atmosphere have insufficient flexibility. 3) The chemical bond produced by adhering the fibers with an adhesive is concerned about the safety due to the elution of the adhesive. 4) Needle punches produced by needling and entanglement of the web with needles are fuzzy and have poor adhesion to the film-forming polymer base, so that the base remains on the skin after sticking / peeling and sticks. The feeling of time is bad. Most of them were unsuitable as a support for a clean skin sheet.

The inventors of the present invention have found that a polypyrrolidone-based film having a specific intrinsic viscosity K value can be formed on a polyolefin nonwoven fabric manufactured by a spunbond method in which fibers are point-bonded by passing through a high-temperature roll provided with projections. It has been found that the above conditions can be sufficiently satisfied when combined with a polymer base. In the present invention, when a nonwoven fabric made of polyolefin produced by the above spunbonding method is used for the support of the skin cleaning sheet, the nonwoven fabric is 10 to 7 per m ^2.
Use 0 g. Preferably ^{20 to 4} per m ²
It is 0 g. If the weight per unit area (1 m ² ) of the nonwoven fabric is too small, sufficient tensile strength cannot be obtained, and the nonwoven fabric will break when peeled from the skin. On the other hand, if it is too much, it is too hard to fit on a curved surface, so that not only a sufficient stain removing effect cannot be obtained, but also the drying speed becomes slow.

The amount of the film-forming polymer is preferably from 50 g to 300 g in terms of the total amount of the film-forming polymer base excluding water and other volatile components per 1 m ² of the nonwoven fabric.
~ 150 g is preferred. If the amount of the film-forming polymer is less than this, a uniform surface cannot be obtained, and if it is more than this, it takes a long time to dry and leaves skin when peeling.

The above-mentioned skin cleansing sheet of the present invention has excellent performance, but the performance of the film can be improved by further blending a specific component with the film-forming polymer base, and the cleansing property can be improved. It has been found that effects can be improved. That is, if dried before use, the film-forming polymer base layer becomes hard, and it becomes difficult to stick to a curved surface such as a face, particularly when using a film-forming polymer base layer that has been dried in advance. Or it becomes brittle and causes cracks, which is not preferable. In this case, the above disadvantages can be improved by blending (a) one or more polyols which are diols, triols or tetraols having 3 to 5 carbon atoms with the film-forming polymer base.

However, when used under high humidity, the film-forming polymer base surface becomes sticky and becomes difficult to handle due to moisture absorption, and becomes difficult to dry after application. In this case, these problems can be solved by blending (b) silicic anhydride with the polyols in the film-forming polymer base.

Further, by adding (c) titanium oxide to this system to make the film-forming polymer base white and turbid,
Skin stains adhering to the surface of the film-forming polymer base are conspicuous, the effect of removing stains can be visually confirmed, and higher consumer satisfaction can be obtained.

The above-mentioned film-forming polymer base containing the above-mentioned specific polyvinylpyrrolidone, one or more of diols, triols or tetraols having 3 to 5 carbon atoms and silicic anhydride is further oxidized. When titanium is blended, not only the above-mentioned visual effect, but also the adhesion to the skin is improved, and the effect of removing dirt can be improved. Hereinafter, each of these components will be described in detail.

In the skin cleaning sheet of the present invention, the polyol (a) to be blended with the film-forming polymer base is as follows:
Di, tri or tetraol having 3 to 5 carbon atoms can improve the hardness and fragility of the film-forming polymer base layer,
Glycerin, 1,3-butylene glycol, isoprene glycol, or a mixture thereof is particularly preferred because the improvement effect is high and there are few defects such as the appearance of stickiness of the film-forming polymer base layer and delay of drying time. The blending amount of the polyol is preferably 0.1 to 10% by weight, particularly preferably 1 to 5% by weight in the film-forming polymer base excluding water and / or other volatile components. If the amount is too small, the effect of softening the film-forming polymer base layer is insufficient, and if the amount is too large, stickiness appears and drying becomes difficult.

In the skin cleaning sheet of the present invention,
The preferred average particle size of the silicic anhydride of the component (b) to be blended with the film-forming polymer base is 0.5 to 10 μm,
Particularly preferably, it is 1 to 3 μm. If the average particle size is too small, the effect of improving the drying properties is insufficient, and if it is too large, the film-forming polymer base layer becomes brittle.
Further, a preferable oil absorption amount of silicic anhydride (JIS K510)
1) is 250 to 400 ml / 100 g. The oil absorption here is based on JIS K5101, and refers to the oil absorption of the boiled linseed oil of the sample. If the amount of oil absorption of the silicic anhydride is too small, the effect of improving the drying property is insufficient, and if it is too large, the adhesive force is reduced. The content of the silicic anhydride is preferably 0.1 to 10% by weight, more preferably 3 to 8% by weight, in the film-forming polymer base excluding water and / or other volatile components. If the amount of the silicic anhydride is too small, the effect of improving the stickiness of the film-forming polymer base layer is insufficient, and if it is too large, the film-forming polymer base layer becomes brittle and adheres. Adhesion decreases, which is not preferable.

Further, in the skin cleaning sheet of the present invention,
The titanium oxide of the component (c) to be mixed with the film-forming polymer base is preferably a rutile-type crystal. There is also an anatase type on the market, but since the crystal form is sparse, the adhesion to the skin is weak, which is not preferable. The preferred average particle size of the titanium oxide is 0.2 to 0.4 μm. If the average particle size is too small, the confirmation of visual stain removal is good,
There is a painful feeling when the film-forming polymer base is peeled from the skin, and when it is too large, the effect of improving the adhesion to the skin is insufficient. The amount of titanium oxide is preferably 0.1 to 5% by weight, more preferably 1 to 2.5% by weight in the film-forming polymer base excluding water and / or other volatile components. . If the amount of titanium oxide is too small, a sufficient effect of improving the adhesion cannot be obtained, and if it is too large, the adhesion to the skin is too strong, and the film-forming polymer base is peeled from the skin. There is a pain at the time, and the film-forming polymer base remains on the skin, which is not preferable.

In the skin-cleaning sheet of the present invention, when the film-forming polymer base layer is a dried viscous solution or dispersion of the film-forming polymer, the water content is in the range of 10 to 30% by weight. Preferably, there is. When the skin cleansing sheet of the present invention is used for the face, it is used as a sheet-like pack, a sheet for treating acne, and when used for local parts of the body such as elbows, knees, and heels, it is used as a keratinized skin removal sheet. it can.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. In the table, PVP indicates polyvinylpyrrolidone, and PP indicates polypropylene.

Examples 1 to 4 and Comparative Examples 1 and 2 Various polyvinylpyrrolidones shown in Table 1 were dissolved in purified water and applied to a polypropylene sheet having a thickness of 70 μm at 100 g / m ^{2 in} terms of polyvinylpyrrolidone. A polypropylene nonwoven fabric (spunbond, 25 g / m ² ) was stacked from above and cut into a rectangle of 4 × 8 cm. This was dried in a thermostat at 50 ° C. for about 20 minutes to adjust the water content of the film-forming polymer base layer to 20% (w / w), and the polypropylene sheet was peeled off. The performance of the obtained skin-cleaning sheet (breakage of the film at the time of peeling, skin residue of the film-forming polymer base, and keratotic plug removal ability) was evaluated by actual use by 10 expert panelists. Table 1 shows the results. The evaluation criteria are as follows. Difficulty of tearing of the film at the time of peeling ○: It did not tear at the time of peeling and was able to be peeled cleanly △: It was torn at the time of peeling (unsuitable) ×: It was torn at the time of peeling Immediately at the time of peeling of the film-forming polymer base Absence ◎: No residual skin was observed at all ○: Slight residual △: Many remained on skin ×: Almost all base remained on skin keratotic plug removal ability ◎: Very well removed ○: Remarkably Good removal Δ: Slight removal X: No removal at all

[0027]

[Table 1] Note) PVP: polyvinylpyrrolidone Non-woven fabric: PP (spunbond: 25 g / m ² )

As is apparent from Table 1, the intrinsic viscosity K value of the film-forming polymer polyvinylpyrrolidone is 25-1.
It can be seen that 00 is excellent as a skin cleaning sheet.

Examples 5 to 7 and Comparative Examples 3 to 6 Various polyvinylpyrrolidones shown in Table 2 were dissolved in purified water and applied to a 70 μm-thick polypropylene sheet in an amount of 100 g / m ^{2 in} terms of polyvinylpyrrolidone. Various nonwoven fabrics shown in Table 2 were stacked from above and cut into a rectangle of 4 × 8 cm. This was dried in a thermostat at 50 ° C. for about 20 minutes to adjust the water content of the film-forming polymer base layer to 20% (w / w). The performance of the obtained skin-cleaning sheet was evaluated in the same manner as in Table 1 for the same items according to the same evaluation criteria. Table 2 shows the results
Shown in

[0030]

[Table 2]

As is evident from Table 2, in the case of nonwoven fabrics made of acrylic fiber and cellulosic fiber, the film-forming polymer base layer penetrates into the nonwoven fabric, and the smoothness of the surface of the film-forming polymer base layer is improved. Cannot be maintained, so that the keratotic plug removal ability is inferior. Even if the nonwoven fabric made by the polyolefin fiber spunbonding method is too heavy per unit (per 1 m ² ), it is too hard to fit on a curved surface. The non-woven fabrics thus obtained have low tensile resistance, and the non-woven fabrics produced by the thermal bonding method are too hard and do not easily fit into the shape of the nose.

Examples 8 to 16 The components shown in Table 3 were added to the film-forming polymer base of Example 6, and a nonwoven fabric made of polypropylene (spunbond, 25 g / m ² ) was used as a support. Prepared a skin cleaning sheet in the same manner as in Example 6. Table 3 shows the results of the evaluation performed in the same manner as in Example 6. The evaluation criteria are as follows. No stickiness ◎: No stickiness at all ○: Slightly sticky △: Sticky ×: Very sticky, unusable for use No cracking ◎: No cracking at all ○: Slight cracking Was observed. Δ: Cracks were observed. X: Severe cracks were observed. Ease of drying, which was unbearable for use. ◎: Immediately dried under high humidity (80% relative humidity). ○: Under high humidity. (80% relative humidity) Relatively fast drying △: Difficult to dry under high humidity (80% relative humidity) ×: Under high humidity (80% relative humidity), it did not dry in a time that could withstand practical use Properties ◎: Very good adhesion ○: Good adhesion to skin by sufficiently holding down △: Partially floating without adhering to skin ×: No adhesion to skin

[0033]

[Table 3]

As is apparent from Table 3, one or two kinds selected from diols, triols or tetraols having 3 to 5 carbon atoms, or silicic anhydride, or oxidized substances are contained in the film-forming polymer base. It can be seen that the performance of the skin cleaning sheet is improved when titanium is added, as compared with the case where these components are not added, but the performance is further improved when these three components are used in combination. Hereinafter, specific formulations of the film-forming polymer base of the clean skin sheet of the present invention are shown. The mixing ratio is based on weight.

Example 17 Polyvinylpyrrolidone (K value = 56) (45% solution) 70.0 Glycerin 2.0 Silicic anhydride 6.0 Titanium oxide 1.8 Ethanol 10.0 l-Menthol 0.3 Peony extract 0 9.1 Birch extract 0.1 Dipotassium glycyrrhetinate 0.2 Perfume 0.2 Purified water 9.3

Example 18 Polyvinylpyrrolidone (K value = 56) (45% solution) 73.0 Glycerin 2.0 Silicic anhydride 6.5 Titanium oxide 1.5 Oil-soluble licorice extract 0.2 Trimethylglycine 0.1 Perfume 0.3 Purified water 16.4

Example 19 Polyvinylpyrrolidone (K value = 56) (45% solution) 50.0 Polyvinylpyrrolidone (K value = 90) 12.0 Isoprene glycol 2.0 Silicic anhydride 4.0 Titanium oxide 2.0 Ellag Acid 0.5 derbilia extract 0.1 purified water 29.4

The components of the formulations of Examples 17 to 19 were mixed and stirred to obtain a uniform dispersion. This solution was applied to a 70 μm thick polypropylene sheet at a thickness of 100 g per 1 m ² , and a polypropylene spunbonded nonwoven fabric (having a basis weight of 1
(30 g per m ² ), and cut into a size of 4 × 8 cm to obtain a clean skin sheet. This was evaluated practically by 20 specialized panels. In the evaluation, the skin-cleaning sheet from which the polypropylene sheet was peeled off was applied to the nose after washing the face, dried, and then used to peel off the skin-cleaning sheet.

Examples 20 to 22 In addition, the skin-cleaning sheets obtained in Examples 17 to 19 were dried by heating, adjusted to a water content of 20%, and sealed in a plastic laminated film bag sandwiching an aluminum layer. This was evaluated practically by 20 specialized panels. In the evaluation, the skin cleansing sheet was taken out of the bag immediately before use, removed from the bag, the polypropylene sheet was peeled off, and the skin cleansing sheet was peeled off.

The skin cleansing sheets of Examples 17 to 22 are free from tears at the time of peeling, film-forming polymer remains on the skin, stickiness, cracks, etc., are easy to dry, and have excellent keratotic plug removal ability and adhesion. It was.

[0041]

The skin cleaning sheet of the present invention has an intrinsic viscosity K value of 25 to 25 as the polymer of the film-forming polymer base layer.
Since polyvinylpyrrolidone of 100 is used, there is no film breakage or skin residue when peeling off, and the dirt removal effect is excellent. In addition, the skin cleaning sheet of the present invention uses a spunbond nonwoven fabric in which the support layer is made of 10 to 70 g of polyolefin fibers per 1 m ² , so that there is no film breakage or skin residue at the time of peeling, and the stain removing effect is low. Are better. Further, by blending a polyol selected from diols, triols and tetraols having 3 to 5 carbon atoms as the component (a) into the film-forming polymer base, flexibility can be imparted and cracks can be formed. Can be prevented. Furthermore, by adding the silicic anhydride of the component (b) to the film-forming polymer base, stickiness under high humidity can be improved, and drying property can be improved. Furthermore, in the film-forming polymer base,
By blending titanium oxide as the component (c), the effect of removing dirt can be visually confirmed, and the adhesion to the skin can be improved. By using these components (a), (b) and (c) together, all of the performances of non-stickiness, non-crack, dryness and adhesion are excellent, and the cleaning effect is remarkably improved. I do.

Claims (2)

[Claims] 1. A film-forming polymer base layer and a support layer holding the base layer, wherein the film-forming polymer base layer contains polyvinylpyrrolidone having an intrinsic viscosity K value of 25 to 100. , epidermal cleaning sheet, wherein the support layer is a nonwoven fabric produced by the spunbond method of a polyolefin-based fibers 10~70g / m ^2. 2. The film-forming polymer base further comprises one or more components selected from the following components (a), (b) and (c): Item 2. A skin cleaning sheet according to item 1. (A) one or more selected from diols, triols or tetraols having 3 to 5 carbon atoms; (b) silicic anhydride; (c) titanium oxide