JPH11100309A - Pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a well-balanced pack between the pain in tearing off from skin surfaces and the removal effect on keratin plug at the time when stains on skin surfaces, particularly stain components (keratin plug) in pores, are effectively removed. SOLUTION: On this pack, the resin component of the basis is comprised of a water-soluble copolymer (A), which is composed of an ethylenically unsaturated monomer showing an anionic property and an ethylenically unsaturated monomer showing an anionic or a nonionic property, alone or in combination with a water-soluble mono- or copolymer(B), which is composed of an ethylenically unsaturated monomer showing an anionic or a nonionic property and contained in an amount of 30 wt.% or less in the resin component, and shows a viscosity of 3,000-100,000 mPa.S at 25 deg.C and a pH value of 3.0-5.5 in the aqueous solution of the concentration of 35 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pack. More specifically, the present invention relates to a pack that can effectively remove dirt on the skin surface, especially dirt components (square plugs) on pores.

[0002]

2. Description of the Related Art Conventionally, film-forming cream compositions containing various hydrophilic polymer compounds have been widely used as peel-off type packs. The main function of these pack agents is to apply them to the skin surface with a finger or the like and then dry them to remove dirt and excess sebum on the skin surface together with the formed film. However, many of these conventional packs are
Because the main purpose is to keep the skin healthy, such as moisturizing, it can be expected to some extent to cleanse the skin, such as removing dirt and sebum on the skin surface,
The effect of removing dirt having extremely strong adhesion inside the skin was not sufficient. Further, for example, there has been reported a pack agent having an excellent moisturizing function, in which a water-containing gel formed by crosslinking polyacrylic acid with a polyvalent metal salt is laminated on a nonwoven fabric to form a sheet (Japanese Patent Application Laid-Open No. 54-54). -49334,
JP-A-59-93012). Although these publications also refer to the effect of removing stains on the skin surface, the packs described in these publications have a problem in that if the adhesive force is excessively increased, the gel is destroyed when peeled off. Furthermore, because of the gel state, it did not penetrate into the pores, and the ability to remove dirt from the pores was extremely poor. In addition to the above packs, the purpose is the nose and its surroundings (especially around the nostrils)
Packing agents limited to the removal of dirt from pores have been developed. Since the use site of this pack is limited to the nose and its periphery, a resin component having a much stronger adhesive force than a normal pack can be used. Therefore, dirt (square plug) of pores can be effectively removed. As such a pack, those using an adhesive and those using a polymer compound having a salt-forming group are known. Among them, as a pack using an adhesive, a sheet-like pack obtained by applying an adhesive such as a polyacrylic ester on a substrate is known.
This pack is basically excellent in removing dirt on the part of the sheet surface that comes into contact with the adhesive, but it does not easily contact dirt deep inside the pores. I couldn't say it was big.

On the other hand, packs for removing keratotic plugs using a polymer compound having a salt-forming group are disclosed in, for example, JP-A-5-9
No. 7627, JP-A-5-221843, JP-A-5-286842 and the like. This type of pack is used, for example, by dissolving a polymer compound in a solvent such as water and applying it to the nose, and then peeling off the polymer compound after drying. For this reason, the polymer compound easily flows into the interior of the pores, and at the time of peeling, the film is solidified by drying, so that the effect of removing the keratotic plug is enhanced. However, when a polymer compound is applied directly to the nose, the film formed by the polymer compound is broken at the time of peeling from the adherend due to its strong adhesive strength, and the pack cannot be removed smoothly. There is. For this reason, it has been considered to apply a polymer compound to a base material such as a nonwoven fabric to form a sheet, affix it to the nose, and remove the entire sheet (Japanese Patent Application Laid-Open No. 7-330575). Specifically, a high molecular compound is applied to a sheet-like base material, and a pack agent obtained by drying is attached to the skin after being moistened with a solvent such as water, and then the high molecular compound is dried. Used in the method of peeling. However, even with these packs, it has been quite difficult to balance the problem of pain when peeling off from the skin surface with the effect of removing keratotic plugs. That is, even if the adhesive force to the skin surface was strong, pain was easily felt, and even though the pain was mild, the effect of removing the keratin plug was not sufficient.

[0004]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and a resin component as a main component comprises an anionic ethylenically unsaturated monomer,
A water-soluble copolymer (A) composed of an anionic or nonionic ethylenically unsaturated monomer alone or from an anionic or nonionic ethylenically unsaturated monomer up to 30% by weight in a resin component Water-soluble homopolymer or water-soluble copolymer (B) (excluding the combination with the same water-soluble copolymer as (A)), and the resin component is an aqueous solution having a concentration of 35% by weight. Is a pack agent comprising a viscosity of 3,000 to 100,000 mPa · S at 25 ° C. and a pH value of 3.0 to 5.5. That is, the pack of the present invention shows adhesiveness to the skin, has excellent permeability to pores, shows strong adhesiveness to keratin plugs in pores, and a film formed as the skin dries is dried. It is easy to grasp an appropriate peeling timing due to the tension applied to the skin, and has effects such as preventing pain due to excessive drying and failure due to peeling in an undried state. Packing agent according to the present invention, as a resin component of the main agent,
It is characterized by using a specific anionic copolymer as a whole. Here, when a cationic polymer is used, the drying speed of the polymer is extremely slow, and it takes time until the keratotic plug can be removed (until the polymer is dried),
There is a problem with convenience. In addition, when only an anionic homopolymer is used, the film becomes hard when dried when the polymer is formed into a sheet. Therefore, it is difficult to adhere the sheet along the curved surface of the skin during use. Further, there is a problem that it takes time until the adhesive strength to the skin is obtained after immersion in water, and it has to be kept for a while, which is inconvenient. On the other hand, the pack agent of the present invention provides an instantaneous adhesive strength, allows the sheet to adhere along the curved surface of the skin in a short time at the time of use, and reduces pain when peeled from the skin. In addition, the plug can be effectively removed.

Hereinafter, the present invention will be described specifically. The resin component of the present invention may be a water-soluble copolymer (A) composed of an anionic ethylenically unsaturated monomer and an anionic or nonionic ethylenically unsaturated monomer alone, or 30% or less in the resin component. Water-soluble homopolymer or water-soluble copolymer (B) comprising an ethylenically unsaturated monomer showing anionic or nonionic properties up to the weight% (however, a combination with the same water-soluble copolymer as (A)) Excluding). First, regarding the water-soluble copolymer (A),
This will be described below. The water-soluble copolymer (A) (hereinafter, also simply referred to as component (A)) can be used as long as the copolymer itself is water-soluble, even if any one of the constituent monomers is not water-soluble. Good. Here, in the present invention, the term "water-soluble" used in a water-soluble copolymer, a water-soluble homopolymer, etc. is derived from packs and skin when used as a pack in the skin, especially in the nose. This means that the copolymer as a resin component or a combination of a copolymer and a homopolymer can be dissolved in water due to moisture. When the viscosity of the resin component of the present invention is specified, a 35% by weight aqueous resin solution is used, but it goes without saying that an aqueous solution is shown at least at such a concentration. More preferably, as an ethylenically unsaturated monomer exhibiting anionic properties, acrylic acid containing a carboxyl group, methacrylic acid, (phthalic anhydride), maleic acid, itaconic acid, etc., and vinylsulfonic acid containing a sulfonic acid group, Examples include styrene sulfonic acid and the like, and derivatives of these monomers.

On the other hand, examples of the anionic or nonionic ethylenically unsaturated monomer copolymerized with the above-mentioned monomer include the following monomers. First, the same monomers as described above can be used as the anionic ethylenically unsaturated monomer. Nonionic ethylenically unsaturated monomers include water-soluble monomers such as acrylamide and vinylpyrrolidone, and esters such as vinyl acetate, methyl acrylate, ethyl acrylate, propyl acrylate and butyl acrylate. And derivatives of these monomers. The above monomers can be used in an appropriate combination in order to achieve the desired properties of the pack agent. The use of a homopolymer obtained by polymerizing a single anionic monomer increases the bond between polymers due to crystallization during drying and increases the film strength, but lacks flexibility during drying. Tend. However, by using a water-soluble copolymer copolymerized with a different monomer, a certain degree of flexibility can be exhibited even when dried. Here, as the water-soluble copolymer, a water-soluble copolymer containing a component derived from a monomer having a side chain such as methacrylic acid can give more flexibility. Also,
A water-soluble copolymer composed of anionic monomers and a water-soluble copolymer of an anionic monomer and a water-soluble nonionic monomer have the flexibility of the film and the degree of water solubility. It is preferable because it is easy to balance. Furthermore, a water-soluble copolymer of an anionic monomer and a non-hydrophilic anionic or nonionic monomer is compatible with a keratotic plug containing a large amount of an oily component due to a component derived from the non-hydrophilic monomer. Is good. However, in this case, it is necessary to copolymerize the whole water-soluble copolymer as long as the water solubility is not lost.
In addition, in the water-soluble copolymer, the component derived from the ethylenically unsaturated monomer exhibiting anionic property may form a salt in whole or in part. Specific examples of the salt include a sodium salt, a potassium salt, an ammonium salt and the like. The ratio of the component derived from the ethylenically unsaturated monomer exhibiting anionicity contained in the water-soluble copolymer is 60%.
It is preferred that the content be at least 10% by weight. If the ratio is 60% by weight or more, a sufficient adhesive force to the skin and the dirt component on the skin surface can be obtained, and the keratotic plug removal performance is further improved.

As a monomer for obtaining the water-soluble copolymer, a combination of acrylic acid and methacrylic acid and / or vinylsulfonic acid is particularly preferred. More specifically, the water-soluble copolymer is obtained by copolymerizing acrylic acid and methacrylic acid and / or vinylsulfonic acid (including their salts) at a ratio of 9: 1 to 6: 4 (weight ratio). It is preferred that it is. When the ratio of acrylic acid exceeds 9, crystallization of the component derived from acrylic acid easily occurs, and when dried, the film becomes extremely hard and lacks flexibility, which is not preferable. Further, when the ratio of acrylic acid exceeds 9, the dissolving speed of the water-soluble copolymer after the moistening is slow in the type of packing agent in which the sheet once dried is used again after being wetted, so that it can be used. This is not preferable because the time required for the process is long and the convenience is poor. On the other hand, when the ratio of the component derived from acrylic acid is less than 6, the adhesiveness to the keratotic plug is reduced and the water solubility is also undesirably reduced. A particularly preferred water-soluble copolymer is a copolymer of acrylic acid and methacrylic acid.

Next, the water-soluble homopolymer and the water-soluble copolymer (B) (hereinafter, also simply referred to as component (B)) will be described below. First, when the component (B) is a copolymer, any one of the monomers constituting the copolymer need not be water-soluble as long as the copolymer itself is water-soluble.
More preferably, as an ethylenically unsaturated monomer exhibiting anionic properties, acrylic acid containing a carboxyl group, methacrylic acid, (phthalic anhydride), maleic acid, itaconic acid, etc., and vinylsulfonic acid containing a sulfonic acid group, Examples include styrene sulfonic acid and the like, and derivatives of these monomers. On the other hand, nonionic ethylenically unsaturated monomers include acrylamide, water-soluble monomers such as vinylpyrrolidone, vinyl acetate, methyl acrylate,
Esters such as ethyl acrylate, propyl acrylate, and butyl acrylate, and derivatives of these monomers, and the like. The above monomers can be appropriately combined in order to achieve the desired properties of the pack. When a pack having desired properties can be obtained only with the component (A), the component (B) may not be added. When the component (B) is added, its mixing ratio is up to 30% by weight. Next, the resin component contained in the pack agent of the present invention is 3,000 to 1 at 25 ° C. in a 35% strength aqueous solution.
It has a viscosity of 00,000 mPa · S. When used as a pack for removing plugs, in order to pull out plugs clogged in the pores, the resin component dissolved in water needs to sufficiently penetrate into the pores. From this viewpoint, when the viscosity exceeds 100,000 mPa · S, the permeability to the pores becomes insufficient, which is not preferable.
No.

[0009] On the other hand, in order to complete the removal of the plug, after forming the film by the resin component, the strength of the resin component film capable of pulling out the plug along with peeling from the skin is required. However, a resin component having a viscosity of less than 3,000 mPa · S is not preferable because sufficient strength cannot be obtained. Further, there is also a problem that the resin component easily flows or is repelled when applied to the skin surface or a sheet. The viscosity of the resin component may be within the above range, but is particularly preferably in the range of 10,000 to 100,000 mPa · S. In order to improve the corn plug removal performance, which is one of the objects of the present invention, the component (A) having a relatively high molecular weight is used.
And the component (B) having a relatively low molecular weight. That is, the above component (A) having excellent film strength after drying and solidification and the low molecular weight component (B) having excellent pore permeability and water solubility act synergistically to provide corn plug removal performance and use. A pack agent having an excellent balance of properties can be obtained. Preferred mixing ratios of the relatively high molecular weight component (A) and the low molecular weight component (B) are 70-99% by weight for the former and 1-30% by weight for the latter. The preferred range of the weight average molecular weight of each component is 100,000 to 350,000 for the former (all of which are aqueous GPC).
In terms of pullulan), the latter being 5,000
~ 50,000. A more preferable range of the weight average molecular weight is that the component (A) having a relatively high molecular weight is 150,000.
~ 300,000, low molecular weight component (B) is 8,000
~ 30,000.

Here, in the present specification, the resin component is specified not in the molecular weight but in the range of viscosity in an aqueous solution state for the following reason. That is, generally, the molecular weight of the resin component is important in the sense that it is closely related to the viscosity of the aqueous solution. However, the viscosity of the aqueous solution differs depending on the molecular structure of the resin component even if the molecular weight is the same. Therefore, in order to define the optimum resin component for the use form of the present invention which is once dissolved in water at the time of use, it is more preferable to specify the range of viscosity in an aqueous solution state than to specify the range of molecular weight. . An aqueous solution of the resin component having a concentration of 35% by weight has a pH value of 3.0 to 5.5. Further, although the details of the principle are unknown, in the region where the pH value of the aqueous solution of the resin component used in the pack agent of the present invention exceeds 5.5, the ability to remove dirt components on the skin surface such as keratotic plugs. Has been found to decrease significantly. From these conditions, the pack agent of the present invention must have a pH value of 3.0 to 5.5. When the pH value is less than 3.0, the effect on the skin surface is large, and even when used for a short period of time such as a pack, the skin is apt to cause symptoms such as skin irritation, which is not practical. In consideration of the case where it is attached to the skin surface for a long time, a more preferable pH range is 4.0 to 5.5.
The resin component, which is the main component of the pack of the present invention, is premised on use on the skin surface, and its pH value is desirably as close to 5.5 as possible. The pH value of the aqueous solution of the resin component having the above concentration was originally 3.0 to 3.0.
When it is between 5.5 and 5.5, it can be used as it is, but when the pH value is lower than this range, it may be adjusted by appropriately adding a basic substance. As such a basic substance,
It is preferable to use a monovalent base such as an alkali metal hydroxide or ammonia. The adjustment of the pH value may be performed after the polymerization of the components (A) and / or (B), or may be performed at the stage of the monomer before the polymerization.

[0011] The resin component contained in the pack of the present invention comprises:
It can be obtained by polymerizing the monomer constituting it by a known method of radical polymerization using a radical polymerization initiator by heat, light, ultraviolet light or the like. The use form of the pack of the present invention is preferably a peel-off type pack attached to the skin surface. The pack agent of the present invention is a resin composition that has become an aqueous solution due to moisture during use, penetrates into the pores and then adheres strongly to the keratin plug by drying, and is excellent in removing keratin plugs when peeling off the film. Performance can be demonstrated. As a specific form of use of the pack, a general paste or pack is applied to the base material.
Molded sheets and the like can be mentioned. Of these, it is preferable that even when the pack agent has a strong adhesive action, it is in the form of a sheet in which destruction of the resin film or the like does not easily occur during peel-off. Examples of the base material of the sheet include a nonwoven fabric and a woven fabric. When applying the pack agent to the substrate as described above, the resin component of the present invention may be used as an adhesive material.
It is preferable to use one having a ratio of 5 to 95 parts by weight and water having a ratio of 5 to 95 parts by weight. If necessary, the resin is dried to adjust the resin component. Further, the pack may contain components used for ordinary cosmetics as other additives. Such other components include silica, talc, and inorganic powders such as titanium oxide for improving drying performance and adhesion performance, and for improving flexibility in forming a film and facilitating compatibility with the skin surface. Examples include surfactants and pigments and dyes for coloring such as oils and fats used in combination therewith, fragrances, and preservatives such as parabens and benzoic acids for preventing spoilage during storage.

In the following, the case of a sheet-like pack, which is a preferred use form of the pack of the present invention, will be described.
First, if the adhesive layer made of the pack agent applied and molded on the sheet base material is made to contain moisture in advance, the initial adhesiveness at the time of attachment to the skin and the sufficient adhesive to the pores of the adhesive can be obtained. Permeability can be ensured. More preferably, it is preferable that the skin or the surface of the adhesive layer be wetted with water before use and then attached to the skin. Here, the adhesive layer preferably contains 60 to 95% by weight of a resin component, a small amount of an additive, and the balance of water. Further, the resin component of the adhesive layer is more preferably 65 to 75% by weight. Of the above, the adhesive layer preferably contains 5 to 40% by weight of water. If the content is less than 5% by weight, the whole sheet becomes hard, the dissolution rate in water decreases, and the initial tackiness at the time of application decreases, which is not preferable. On the other hand, if it exceeds 40% by weight, the adhesive layer is not sufficiently hardened, and the usability deteriorates. In order to prevent the sheet-shaped pack from drying, it is preferable that each of the sheets is in a state of use and is individually wrapped in a sterilized and sealed state.

In the case of a sheet pack, a release paper or a plastic film is usually attached to the surface of the adhesive layer. These release papers and films are not sufficiently peeled or peeled off due to insufficient release properties of the adhesive layer, which has been adjusted by moisture content to have sufficient adhesion and adhesion to the skin, and flexibility. May destroy the adhesive layer. Therefore, even when the adhesive layer is added with a nonionic lipophilic surfactant in an amount of 0.1 to 5% by weight to increase the water content to obtain a soft feel, the adhesive layer can be used for release paper or protective paper. The releasability from the film can be easily secured. Specific examples of the nonionic lipophilic surfactant include sugar fatty acid esters and polyoxyethylene polyoxypropylene block copolymers.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(Examples) The effects of the present invention will be concretely described below with reference to examples. (Synthesis example of water-soluble polymer) A hydrophilic polymerizable monomer was mixed in the compounding amount shown in Table 1, and polymerization was carried out in an aqueous solution state. Specifically, a water-soluble polymer was synthesized by the following method. That is, raw materials (monomers) other than the initiators (potassium persulfate and potassium pyrosulfite) were placed in a glass container having a capacity of 200 ml by weight as shown in Table 1. Next, the residue was supplemented with ion-exchanged water so that the total amount including the initiator was 100 parts by weight to obtain an aqueous solution in which monomers were mixed. After uniformly stirring the aqueous solution, the specified amount of initiator was added. Further, the mixture was stirred uniformly and stirred in a heater at 40 ° C. for 2 hours to complete the polymerization to obtain a water-soluble polymer. Table 1 also shows the weight average molecular weight of the obtained water-soluble polymer. The weight average molecular weight is a value converted to pullulan by aqueous GPC, and the measurement conditions are HPLC: Shimadzu LC-6A, Column: Shod
ex Ohpak SB-806M HQ x 2, column temperature:
40 ° C., solvent: 0.2 M NaNO ₃ , flow rate: 0.7 ml / min,
Detector: ShodexSE-61 RI detector, Standard substance: Shodex
Pullulan.

[0015]

[Table 1]

To the aqueous solution containing the water-soluble polymer, basic substances (sodium hydroxide) and ion-exchanged water (pH 6.5) shown in Table 2 were added to adjust the aqueous solution to a resin concentration of 35%. . Further, after adjusting the temperature of the aqueous solution to 25 ° C.,
The pH and viscosity were measured. The pH value was measured using a pH meter with a glass electrode, and the viscosity was measured using a B-type viscometer after adjusting the temperature of the measurement target to 25 ° C. Table 2 shows the measurement results.

[0017]

[Table 2]

(Tests for Pain at Peeling, Removal of Square Plugs, and Initial Solubility) To each of the resin components of Formulation Examples 1 to 14, other components were added in amounts shown in Table 3 to form pastes. . This paste was applied to a 50 μm-thick PET film (release paper) so that the application amount of the pure resin was 63 g / m 2. Then, it was dried in a dryer at 70 ° C. for 20 minutes. Next, a nonwoven fabric of polyester / polyethylene blend having a basis weight of 25 g / m ² as a sheet base material is pressed against the paste surface in a semi-dry state, and dried for 10 minutes to obtain 1 sheet.
Four sets of sheet packs were obtained.

[0019]

[Table 3]

[0020] These sheet-like packs are sized 15 x 30 m
Each of the pieces was cut into small pieces having a size of m, and the PET film was peeled off. Thereafter, the sheet-shaped pack was pressed against the nostrils wet with water after washing the face. Among the sheet packs, those of Formulation Examples 1 to 8 were stuck to the nostrils instantaneously and did not come off during drying for 20 minutes. On the other hand, the thing of the composition example 10 does not stick to a nostril immediately,
I had to hold it for a while. In addition, the product of Formulation Example 9 was likely to come off during drying for 20 minutes, and had to be held down. After drying, the result of peeling off the sheet-shaped pack was evaluated in terms of the following criteria in terms of the following criteria in terms of pain at the time of peeling and removal of horn plugs. (1) Pain when peeling I feel severe pain. Feel pain. 3. Almost no pain when peeling. Evaluations were reported by each panelist.

(2) How to remove the square plug The horn plug cannot be removed at all. (No square plug) 2. The horn plug can be removed a little. (1 to 20 square plugs) Square plug can be removed well. (The number of square plugs is 20 or more.) Note that square plugs emit fluorescence when irradiated with ultraviolet light.
Utilizing this property, the pack was irradiated with ultraviolet rays by a wood lamp, and the number of the plugs was counted by counting the number of the portions. In addition, the hair part was excluded and counted. The evaluation was calculated from the average of the evaluation results by 20 female panelists. At the time of measurement of one sample, the panelists performed the measurement one week immediately before the measurement without performing the same evaluation. In addition, for comparison between two specific samples, the test sample and the comparative sample are attached symmetrically with respect to the center line of the nose,
The number of horn plugs was counted by the above-described method, and the numbers were compared to determine whether there was a significant difference between the two methods. (3) Initial solubility in water After wetting the once dried sheet with water, the initial dissolution performance is measured by the following method to measure the time required for the water-soluble polymer to dissolve and adhere. did. The pack agent prepared in the same manner as above was cut into 30 × 60 mm, and once cut into 120 × 60 mm.
After drying in a dryer at 30 ° C. for 30 minutes, the weight was precisely weighed. Next, the pack was immersed in a glass beaker containing 500 ml of 25 ° C. deionized water for 30 seconds. Further, the pack was taken out, placed again in a dryer at 120 ° C. for 60 minutes, dried, and weighed precisely. The amount of weight loss after immersion compared to before immersion in deionized water was defined as the amount of polymer eluted. Table 4 shows the measurement results of the above (1) to (3).

[0022]

[Table 4]

Table 5 shows the results of comparison between two specific samples.

[0024]

[Table 5]

From the above Tables 4 and 5, it was found that the packs of Examples were excellent in pain at the time of peeling, removal of horn plugs, and initial solubility. (Releasability test with release paper) A paste was prepared by adding other additives containing the nonionic lipophilic surfactant in the amounts shown in Table 6 below to the resin component of Example 1.

[0026]

[Table 6]

The pastes of Examples 9 and 10 and PE
The releasability from the T film was examined by the following method together with the paste of Example 1. That is, the coating amount of the resin component is 6
It was applied to a 50 μm-thick PET film so as to have a thickness of 3 g / m ² . A nonwoven fabric of polyester / polyethylene blend having a basis weight of 25 g / m ² was placed thereon, and dried in a drier at 70 ° C. In this drying operation, by changing the drying time between 5 minutes and 30 minutes, sheet-like packs having various moisture contents were prepared. The moisture content was determined by dividing the sheet-shaped pack into halves and dividing one of the pieces into one.
After drying at 20 ° C. for 3 hours, the weight loss was determined. Furthermore, the PET film on the other section was peeled off, and the state of the plaster at the time of peeling was observed and evaluated based on the following criteria. Table 7 shows the results. × The plaster adheres to the PET film side and cannot be peeled off. △ Part of the plaster adhered to the PET film side and could not be peeled off. ○ The plaster and film can be easily peeled off.

[0028]

[Table 7]

From Table 7, it was found that the pack containing the nonionic lipophilic surfactant was excellent in releasability from release paper. (Comparison of the removal of the square plug between the commercially available product and the pack made of the cationic water-soluble polymer and the pack of Example 1)
As Comparative Example 7, a commercially available sheet-like pack agent (Biore Pore Clear Pack; manufactured by Kao) was used. Further, a commercially available cationic polymer (trade name: Sharol (polymethacryloyloxyethyltrimethylammonium chloride: QD
M); a paste was prepared with the same composition as in Table 3 except that a 35% by weight aqueous solution of Daiichi Kogyo Seiyaku Co., Ltd.) was used, and a sheet pack was prepared in the same manner as in Example 1. This sheet-shaped pack agent was used as Comparative Example 8. Comparative Examples 7 and 8
The superiority of the sheet-shaped pack agent of Example 1 in removing the square plug was confirmed by the following method. 2 panelists of 40 people
Divide into two groups by 0 people, and after washing your face, 20mm x 30m
In Example 1, and Comparative Examples 7 and 8, the sample cut to m was pasted symmetrically about the center line of the nose. One group was peeled 10 minutes after pasting, and the other group was peeled 20 minutes after pasting. When the pack of Example 1 is pressed against the nose, it immediately exhibits adhesiveness and adheres,
After 10 minutes and 20 minutes, the sticking was good, whereas the packs of Comparative Examples 7 and 8 were pressed against the nose.
It did not stick immediately and had to be held down for a while until the adhesive strength was obtained. By counting the number of plugs of the peeled sample by the above method and comparing the numbers, it was compared whether there was a significant difference between the peeling method and the removing method of the square plug. Table 8 shows the results. The test was performed at a temperature of 23.
The test was performed indoors at a temperature of 60 ° C and a humidity of 60%.

[0030]

[Table 8]

From the above Table 8, it was found that the sheet-shaped pack of Example 1 had a superior keratotic plug-removing power than the commercially available sheet-shaped pack. Furthermore, it was found that a pack comprising an anionic resin component had superior keratotic plug removal power and drying properties over a pack comprising a cationic resin component. (Comparison of drying speed between the commercial product and the pack of Example 1)
The resin solution used for preparing the sheet-shaped pack agent of Example 1 adjusted in Example 1 and a resin solution extracted from a commercial product (Comparative Example 7) were placed in a thermo-hygrostat at 37 ° C. and 35% humidity. The weight loss rate of each of the resin solutions was measured at every lapse of time. The results are shown in FIG. From FIG. 1, it was found that the water content of the resin solution used in the pack agent of Example 1 evaporated faster than that of the commercial product. This result indicates that, at the time of use, the pack of Example 1 dries faster than the commercial product.

[0032]

Industrial Applicability The present invention provides a water-soluble copolymer in which a resin component as a main ingredient comprises an anionic ethylenically unsaturated monomer and an anionic or nonionic ethylenically unsaturated monomer. (A) alone or in resin component 30
Up to 35% by weight of an aqueous solution having a resin component concentration of 35% by weight in combination with a water-soluble homopolymer or a water-soluble copolymer (B) comprising an ethylenically unsaturated monomer exhibiting anionic or nonionic properties. At 25 ° C
Viscosity of 00-100,000 mPa · S and 3.0-5.
A pack comprising a pH value of 5, exhibiting adhesiveness to the skin, excellent penetration into pores, strong adhesion to keratin plugs in pores, and drying time It is quick, and it is easy to grasp the appropriate peeling timing due to the tension given to the skin by the film formed as it dries, and it has excellent effects such as preventing pain due to overdrying and failure due to peeling in an undried state. Have.

[Brief description of the drawings]

FIG. 1 is a graph comparing the drying rates of the resin components of the present invention with those of a commercially available pack agent.

Claims (11)

[Claims] 1. A water-soluble copolymer (A), in which a resin component as a main ingredient is composed of an ethylenically unsaturated monomer showing anionic property and an ethylenically unsaturated monomer showing anionic property or nonionic property. Or in combination with a water-soluble homopolymer or water-soluble copolymer (B) comprising an ethylenically unsaturated monomer showing anionic or nonionic properties of up to 30% by weight in the resin component, Concentration 3
In a 5% by weight aqueous solution, 3,000-10 at 25 ° C.
A pack comprising a viscosity of 000 mPa · S and a pH value of 3.0 to 5.5. 2. The water-soluble copolymer (A) comprises acrylic acid,
Anionic ethylenically unsaturated monomer selected from methacrylic acid or vinylsulfonic acid, and anionic or nonionic ethylenic selected from acrylic acid, methacrylic acid, vinylsulfonic acid, acrylamide or vinylpyrrolidone The pack according to claim 1, which is a copolymer with an unsaturated monomer. 3. The pack according to claim 2, wherein the water-soluble copolymer (A) is a copolymer of acrylic acid, methacrylic acid and / or vinyl sulfonic acid. 4. The water-soluble copolymer (A) is a copolymer obtained by copolymerizing acrylic acid, methacrylic acid and / or vinyl sulfonic acid in a weight ratio of 9: 1 to 6: 4. The pack according to claim 3. 5. The method according to claim 1, wherein the resin component is 100,000 to 350,
Water-soluble copolymer (A) having a weight-average molecular weight of 000 (pullulane equivalent by water-based GPC; the same applies hereinafter) and a water-soluble single weight having a weight-average molecular weight of 5,000 to 50,000 up to 30% by weight in the resin component The pack agent according to any one of claims 1 to 4, comprising a coalescence or a copolymer (B). 6. The pack according to claim 1, further comprising 0.1 to 5% by weight of a nonionic lipophilic surfactant as an additive.
5. The pack according to any one of 5. 7. The pack according to claim 6, wherein the nonionic lipophilic surfactant is a sugar fatty acid ester or a polyoxyethylene polyoxypropylene block copolymer. 8. The pack according to claim 1, comprising 60 to 95% by weight of a resin component, a small amount of an additive, and the balance of water. 9. The pack according to claim 1, wherein the pack is used for removing keratotic plugs. 10. The pack agent according to claim 1, wherein the pack agent is laminated on a sheet-like substrate. 11. The pack according to claim 10, wherein the sheet-like substrate is a nonwoven fabric.