Pack cosmetics

Abstract

To provide a pack cosmetic that can be spread smoothly on skin, is resistant to peeling when dried on the skin, can be rinsed off without scrubbing, and can give the cleansed skin a silky touch.SOLUTION: A pack cosmetic contains 10-50 mass% of clay mineral (a), 0.1-1 mass% of thickening polysaccharides (b), 0.05-5 mass% of a nonionic surfactant (c) with an HLB of 13-16, and 0.0005-0.25 mass% of a copolymer (d) such as "CERACUTE(R)-F" and "CERACUTE(R)-L", with the mass ratio of the (b) component to the (d) component [(b) / (d)] of 1-200.SELECTED DRAWING: None

Description

[Technical Field]

[0001] Regarding bracket pack cosmetics. [Background technology]

[0002] Face masks are special care products used a few times a week, separate from daily skincare products, and their primary purpose is to improve the condition of the skin on the face, body, and other areas. Their main functions are to "moisturize and condition the skin (skin hydration and revitalization)" and "remove dirt from the skin while conditioning it (removal of dirt from the skin surface, skin hydration and revitalization)." These face masks remove dirt that is difficult to remove with daily skincare products and also have a skin conditioning effect, making them effective for maintaining good skin condition.

[0003] Among these, "mud packs" are widely used cosmetic packs. Mud packs are cosmetic packs that utilize the adsorptive power of mud (clay) to remove dirt from the skin, and are also expected to have skin-conditioning effects through the addition of minerals. Compositions mainly containing clay minerals and combined with nonionic surfactants and oils have been disclosed (Patent Documents 1 and 2). Mud packs, which contain a high concentration of mud, are popular as a product with particularly high dirt-absorbing properties. These packs are applied to the skin, allowed to dry, and then rinsed off to allow the mud to firmly absorb the dirt. However, concerns remain regarding reduced spreadability on the skin due to the high mud concentration and dryness after washing.

[0004] Patent Document 3 discloses a pack cosmetic containing clay minerals, an anionic surfactant, an oily component, a water-soluble polymer compound, and a polyhydric alcohol. This pack cosmetic spreads well and is excellent at leaving the skin feeling fresh and smooth after use, but it requires thorough scrubbing to rinse off, leaving room for improvement in reducing the burden on the skin. Mud masks tend to flake off when they dry, so they are mainly used in the bathroom, timed to coincide with bathing. In recent years, the number of people who wash their face in the morning has increased, and mud masks, which have cleansing and skin-conditioning effects, are increasingly being used as an out-of-bath morning cleanser. Therefore, in addition to their conventional functions, there is a growing demand for mud masks that do not easily flake off when they dry on the skin. In other words, there was a need for a face mask cosmetic that could be spread smoothly on the skin, would not easily peel off once dry, could be washed off without rubbing, and would leave the skin feeling smooth after washing. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2009-215256 [Patent Document 2] International Publication No. 2014 / 157265 [Patent Document 3] Japanese Patent Publication No. 2006-206448 [Overview of the project] [Problems that the invention aims to solve]

[0006] The object of the present invention is to provide a pack cosmetic that can be spread smoothly on the skin, does not easily peel off when dried on the skin, can be washed off without rubbing, and leaves the skin feeling smooth after washing. [Means for solving the problem]

[0007] The inventors of the present invention conducted extensive research to solve the above problems and discovered that the desired pack cosmetic composition can be obtained by combining clay minerals, thickening polysaccharides, a nonionic surfactant having a predetermined HLB, and a specific copolymer in a specific ratio, thus completing the present invention.

[0008] In other words, the pack cosmetic composition of the present invention contains 10 to 50% by mass of clay mineral (a), 0.1 to 1% by mass of thickening polysaccharide (b), 0.05 to 5% by mass of nonionic surfactant (c) with an HLB of 13 to 16, and 0.0005 to 0.25% by mass of copolymer (d) obtained from a monomer mixture containing monomers represented by the following formulas (1) and (2), and the mass ratio of component (b) to component (d) [(b) / (d)] is 1 to 200. [ka] (In the formula, R 1 (where n represents a hydrogen atom or a methyl group, and n is an integer from 1 to 4.) [ka] (In the formula, R 2 represents a hydrogen atom or a methyl group, L 1 -C6H4-, -C6H 10 -, -(C=O)-O-, -(C=O)-NH-, -O-(C=O)-, and L 2 (This represents an alkyl group with 10 to 22 carbon atoms.) [Effects of the Invention]

[0009] The cosmetic pack of the present invention can be spread smoothly on the skin, does not easily peel off when dried on the skin, can be washed off without rubbing, and leaves the skin feeling smooth after washing. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below. Various modifications are possible without departing from the spirit of the present invention. In this specification, numerical ranges defined using the symbol "~" include the numbers at both ends (upper and lower limits) of "~". For example, "2~5" means 2 or greater and 5 or less. Also, when a concentration or amount is specified, any higher concentration or amount can be associated with any lower concentration or amount. For example, when there are descriptions of "2 to 10% by mass" and "preferably 4 to 8% by mass", descriptions of "2 to 4% by mass", "2 to 8% by mass", "4 to 10% by mass", and "8 to 10% by mass" are also included. Furthermore, "(meth)acrylate" represents acrylate or methacrylate.

[0011] The packed cosmetic of the present invention contains at least the following clay mineral (a) (hereinafter, may be referred to as component (a)), thickening polysaccharide (b) (hereinafter, may be referred to as component (b)), nonionic surfactant (c) with an HLB of 13 to 16 (hereinafter, may be referred to as component (c)), and a copolymer (d) (hereinafter, may be referred to as component (d)) obtained from a monomer mixture containing each monomer represented by the following formulas (1) and (2). These components will be sequentially described below.

[0012] [Component (a): Clay Mineral] Component (a) used in the present invention is a clay mineral. The clay mineral (a) is a silicate mineral, talc, and mica (sericite), and one selected from these may be used alone, or two or more may be used in appropriate combination. Examples of the silicate mineral include phyllosilicate minerals (kaolin group, montmorillonite group, clay mica group, chlorite group, serpentine group, etc.), tectosilicate minerals (zeolite group, etc.), and the like. Specific examples of the clay mineral include pyrophyllite, talc, chlorite, chrysotile, antigorite, lizardite, kaolinite, dickite, nacrite, halloysite, montmorillonite, nontronite, saponite, sauconite, bentonite, soda zeolite group (soda zeolite, mesolite, scolecite, thomsonite, etc.), stilbite group (stilbite, epistilbite, offretite, etc.), zeolite (analcite, barrerite, epistilbite, chabazite, gmelinite, etc.), light, and the like.

[0013] Clay minerals are classified into water-swellable clay minerals (a1) (hereinafter sometimes referred to as component (a1)) and non-water-swellable clay minerals (a2) (hereinafter sometimes referred to as component (a2)) based on their properties. Water-swellable clay minerals are clay minerals whose main components are magnesium aluminum silicate and magnesium sodium silicate. Generally, smectite group minerals are preferred as water-swellable clay minerals, such as montmorillonite, hectorite, and saponite. Non-water-swellable clay minerals include, for example, kaolin and silt.

[0014] In the pack cosmetic composition of the present invention, it is preferable to use a combination of a water-swellable clay mineral (a1) and a non-water-swellable clay mineral (a2) to further improve resistance to peeling off the skin. When used in combination, the mass ratio of component (a1) to component (a2) (a1 / a2) is preferably in the range of 1 / 0.1 to 1 / 5, and more preferably 1 / 0.5 to 1 / 2. The clay minerals mentioned above may be either natural or synthetic.

[0015] The content of ingredient (a) is 10 to 50% by mass, preferably 12 to 42% by mass, and more preferably 15 to 30% by mass, when the total mass of the pack cosmetic is considered to be 100% by mass. If the content of ingredient (a) is too low, the smoothness of the spread on the skin and the smooth feeling of the skin after washing may be reduced. If the content of ingredient (a) is too high, the resistance to peeling off the skin, the ease of rinsing, and the smooth feeling of the skin after washing may be reduced. Component (a) may be one type selected from the above clay minerals alone, or two or more types may be used in combination. Furthermore, as described above, it is more preferable to include water-swellable clay minerals (a1) and non-water-swellable clay minerals (a2) in specific proportions. When using two or more types of clay minerals, their total content should be within the above range.

[0016] [Ingredient (b): Thickening polysaccharides] The component (b) used in the present invention is a thickening polysaccharide. A thickening polysaccharide is a water-soluble polysaccharide composed of multiple sugars that has the property of increasing viscosity when dissolved in water. Examples include cellulose and cellulose derivatives, xanthan gum, carrageenan, pectin, mannan, curdlan, chondroitin sulfate, starch, heparan sulfate, hyaluronic acid, sodium hyaluronate, guar gum, dextran, locust bean gum, chitin, chitosan, agar, and the like. One of these may be used alone, or two or more may be used in appropriate combinations. Among these, xanthan gum is preferred considering its smooth spreadability and ease of washing off.

[0017] The content of ingredient (b) is 0.1 to 1% by mass, preferably 0.2 to 0.9% by mass, and more preferably 0.3 to 0.8% by mass, when the total mass of the pack cosmetic is 100% by mass. If the content of ingredient (b) is too low, the smoothness of the pack cosmetic on the skin may decrease, or the pack cosmetic may peel off easily on the skin. If the content of ingredient (b) is too high, the smoothness of the spread on the skin and the ease of washing off may decrease. As component (b), one type selected from the above-mentioned thickening polysaccharides may be used alone, or two or more types may be used in combination. If two or more types of thickening polysaccharides are used, their total content should not exceed the above-mentioned range.

[0018] [Component (c): Nonionic surfactant with HLB 13-16] The component (c) used in this invention is a nonionic surfactant with an HLB of 13 to 16. Nonionic surfactants with an HLB of 13 to 16 contribute to smooth spreadability, resistance to peeling off the skin, and ease of washing off. If the HLB of the nonionic surfactant is excessively low or excessively high, the compatibility with other components in the pack cosmetic may decrease, making it difficult for the pack cosmetic to spread smoothly on the skin or causing it to peel off easily.

[0019] Specific examples of component (c) include polyoxyethylene alkyl ethers and polyoxyethylene fatty acid glyceryls. Polyoxyethylene stearyl ether (cosmetic ingredient name: steareth) is particularly preferred, and for example, steareth-15 (HLB 14.2) or steareth-20 (HLB 15.3) can be used. Furthermore, HLB can be determined by the Griffin method, which is shown in the following formula. HLB = 20 × (Molecular weight of hydrophilic group / Total molecular weight)

[0020] The content of ingredient (c) is 0.05 to 5% by mass, preferably 0.1 to 4.5% by mass, and more preferably 0.3 to 4% by mass, when the total mass of the pack cosmetic is considered as 100% by mass. If the content of ingredient (c) is too low, it may become less rinsable and the smooth feeling of the skin after washing may decrease. If the content of ingredient (c) is too high, the smoothness of the spread on the skin and the resistance to peeling off the skin may decrease. As component (c), one of the above nonionic surfactants may be used alone, or two or more may be used in combination. If two or more nonionic surfactants are used, their total content should not exceed the above range.

[0021] [Component (d): Copolymer obtained from a monomer mixture containing each monomer represented by formula (1) and formula (2)] Component (d) used in the present invention is a copolymer obtained from a monomer mixture containing monomers represented by the following formulas (1) and (2).

[0022] [ka]

[0023] R in equation (1) 1 n represents a hydrogen atom or a methyl group, and is preferably a methyl group from the viewpoint of high stability. n is an integer from 1 to 4, preferably 2 or 3, and more preferably 2 from the viewpoint of availability. As the glycerol (meth) acrylate monomer represented by formula (1), preferably, R 1 is a methyl group and n is 2 or 3 (more preferably 2). Specific examples of the glycerol (meth) acrylate monomer represented by formula (1) include glycerol-1-methacryloyloxyethyl urethane, glycerol-1-methacryloyloxypropyl urethane, etc. From the viewpoint of ease of synthesis, glycerol-1-methacryloyloxyethyl urethane is preferred.

[0024] [Chemical formula]

[0025] R in formula (2) 2 represents a hydrogen atom or a methyl group, and is preferably a methyl group from the viewpoint of high stability. L 1 represents -C6H4-, -C6H 10 -, -(C=O)-O-, -(C=O)-NH-, or -O-(C=O)-, and is preferably -(C=O)-O- or -O-(C=O)-. L 2 represents an alkyl group having 10 to 22 carbon atoms. The alkyl group having 10 to 22 carbon atoms represented by L 2 may be either linear or branched. Specific examples include decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, eicosyl group, henicosyl group, heneicosyl group, docosyl group, icosanyl group, icosenyl group, eicosanyl group, henicosyl group, heneicosyl group, docosanyl group, etc. The number of carbon atoms of the alkyl group represented by L 2 is preferably 12 to 22, and more preferably 16 to 22.

[0026] As the long-chain alkyl group-containing monomer represented by formula (2), preferably, R 2 is a methyl group and L 1However, it is -(C=O)-O- or -O-(C=O)-, L 2 The compound is an alkyl group having 12 to 22 carbon atoms (more preferably 16 to 22 carbon atoms). Specific examples of long-chain alkyl group-containing monomers represented by formula (2) include, for example, decyl (meth)acrylate, dodecyl (meth)acrylate, tetradecyl (meth)acrylate, hexadecyl (meth)acrylate, octadecyl (meth)acrylate, docosanyl (meth)acrylate, vinyl decanoate, vinyl dodecanoate, vinyl hexadecanate, vinyl octadecane, vinyl docosanate, etc., with hexadecyl (meth)acrylate, octadecyl (meth)acrylate, or docosanyl (meth)acrylate being preferred.

[0027] The content of the glycerol (meth)acrylate monomer represented by formula (1) in the monomer mixture constituting the copolymer of component (d) is arbitrary. However, from the viewpoint of resistance to peeling off the skin and smooth spreadability, when the total amount of the above monomer mixture is 100% by mass, the content of the glycerol (meth)acrylate monomer represented by formula (1) is preferably 10 to 80 mol%, and more preferably 20 to 70 mol%.

[0028] The content of the long-chain alkyl group-containing monomer represented by formula (2) in the monomer mixture constituting the copolymer of component (d) is arbitrary. However, from the viewpoint of resistance to peeling off the skin, when the total amount of the above monomer mixture is 100% by mass, the content of the long-chain alkyl group-containing monomer represented by formula (2) is preferably 10 to 80 mol%, and more preferably 20 to 70 mol%.

[0029] The monomer mixture constituting the copolymer of component (d) may contain, in addition to the glycerol (meth)acrylate monomer represented by formula (1) and the long-chain alkyl group-containing monomer represented by formula (2), other monomers to the extent that they do not significantly impair the objectives of the present invention. However, the sum of the content of the glycerol (meth)acrylate monomer represented by formula (1) and the content of the long-chain alkyl group-containing monomer represented by formula (2) in the above monomer mixture is preferably 90 mol% or more, more preferably 95 mol% or more, even more preferably 99 mol% or more, and may be 100 mol%.

[0030] The weight-average molecular weight of the copolymer of component (d) is preferably in the range of 5,000 to 5,000,000, and more preferably in the range of 100,000 to 2,000,000, from the viewpoint of resistance to peeling off the skin, smoothness of spreadability, and ease of formulation. In this invention, "weight-average molecular weight" refers to the value measured by gel permeation chromatography (GPC).

[0031] A commercially available product can be used as the copolymer of component (d). Examples of such commercially available products include "CERACUTE(registered trademark)-F" and "CERACUTE(registered trademark)-L" manufactured by NOF Corporation.

[0032] The content of ingredient (d) is 0.0005 to 0.25% by mass, preferably 0.001 to 0.2% by mass, and more preferably 0.01 to 0.15% by mass, when the total mass of the pack cosmetic is considered to be 100% by mass. If the content of ingredient (d) is too low, the resistance to peeling off the skin and ease of washing off may decrease, and the effect of giving the skin a smooth feeling after washing may be weakened. If the content of ingredient (d) is too high, the smoothness of spreading on the skin and ease of washing off may decrease. Component (d) may be one copolymer selected from the above list alone, or two or more copolymers may be used in combination. If two or more copolymers are used, their total content should not exceed the above range.

[0033] In the pack cosmetic composition of the present invention, the mass ratio of component (b) to component (d) [(b) / (d)] is 1 to 200, preferably 2 to 150, and more preferably 5 to 100. If the mass ratio [(b) / (d)] is too small, the smoothness of the spread on the skin and the resistance to peeling off the skin may decrease. If the mass ratio [(b) / (d)] is too large, the smooth feeling after rinsing may be weakened, and the ease of rinsing may decrease.

[0034] [Component (e): Proteoglycan] As described above, the pack cosmetic composition of the present invention contains at least a clay mineral (a), a thickening polysaccharide (b), a nonionic surfactant with HLB 13-16 (c), and a copolymer (d), and preferably further contains a proteoglycan (e) (hereinafter sometimes referred to as component (e)).

[0035] Proteoglycans are complexes of sugars and proteins with a specific structure, and both animal and plant-derived proteoglycans exist. Animal proteoglycans are glycoproteins in which multiple glycosaminoglycans, such as chondroitin sulfate and keratan sulfate, are covalently bonded to a single core protein. They are widely distributed throughout the body as a component of the extracellular matrix, including organs, the brain, skin, and cartilage. Plant-derived proteoglycans are formed by the binding of arabinogalactan and a core protein in a specific manner, and are formally called arabinogalactan-proteins (AGPs). They exist as extracellular matrix in plant cell walls and sap.

[0036] In the present invention, either animal-derived proteoglycans or plant-derived proteoglycans can be used as component (e). However, considering the manufacturing cost and the recent trend towards preferring plant-derived raw materials, it is preferable to use plant-derived proteoglycans. As for plant-derived proteoglycans, those made from gum arabic obtained from the Acacia senegal Willdenow tree, or a closely related plant of the same genus, belonging to the Mimosoideae subfamily of the Fabaceae family, are preferably used. Here, gum arabic is obtained by drying the secretion that seeps out from wounds in the bark of the aforementioned plant. Since the resulting product has physiological activity equivalent to or greater than that of animal proteoglycans, the present invention more preferably uses gum arabic obtained from Acacia senegal Willdenow or its seyal species, Acacia seyal Delile, as a raw material, and even more preferably uses gum arabic obtained from Acacia senegal Willdenow as a raw material. The plant proteoglycan preferably used as component (e) in the present invention is obtained as a purified product from gum arabic obtained from plants such as the above-mentioned gum arabic tree, mainly by removing arabinogalactan and glycoprotein.

[0037] Plant-derived proteoglycans with a weight-average molecular weight of 900,000 to 3,500,000 are preferably used, and those with a weight-average molecular weight of 1,000,000 to 3,000,000 are more preferably used. In this specification, the weight-average molecular weight of plant-derived proteoglycans is measured by size exclusion chromatography using a multi-angle light scattering detector and a differential refractive index detector connected online. Furthermore, plant-derived proteoglycans with a total aldehyde content of 0.005 to 2.0 μmol equivalents / g are preferably used. In this specification, the total aldehyde content is measured using an aldehyde quantification kit such as the Amplite® Colorimetric Aldehyde Quantitation Kit (product number: 10051) (manufactured by AAT Bioquest).

[0038] If the pack cosmetic of the present invention contains component (e), its content is preferably 0.0001 to 0.1% by mass, more preferably 0.001 to 0.09% by mass, and even more preferably 0.01 to 0.08% by mass, when the total mass of the pack cosmetic is 100% by mass. If the content of component (e) is too low, the resistance to peeling off the skin and ease of washing off may decrease, and the effect of giving the skin a smooth feeling after washing may be weakened. If the content of component (e) is too high, the smoothness of spreading on the skin may decrease.

[0039] The cosmetic pack of the present invention contains water, such as purified water, as a solvent, in addition to components (a) to (e). The water content is preferably 50 to 90% by mass, more preferably 60 to 85% by mass, and even more preferably 70 to 80% by mass, when the total mass of the cosmetic pack is 100% by mass.

[0040] The cosmetic pack of the present invention may contain additives other than the above-mentioned components (a) to (e) and water, as long as they do not impair the effects of the present invention. Additives that may be included in the pack cosmetic composition of the present invention include, for example, polyhydric alcohols such as glycerin, diglycerin, polyethylene glycol, sorbitol, maltitol, and isomaltitol; sugars such as lactose, fructose, sucrose, maltose, trehalose, and isomaltoligosaccharides; natural oils and fats such as beef tallow and pork tallow; waxes such as beeswax and carnauba wax; silicone derivatives such as highly polymerized dimethylpolysiloxane, polyether-modified dimethylpolysiloxane, and amino-modified dimethylpolysiloxane; oily bases such as ceramide, cholesterol, protein derivatives, lanolin, lanolin derivatives, and lecithin; amphoteric surfactants such as amide amino acid salts and amidopropyldimethylaminoacetic acid betaine; and fatty acid ethers of polyoxyethylene alkyl ether and polyethylene glycol. Nonionic surfactants such as telamine, polyoxyethylene hydrogenated castor oil, polyglycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, glycerin mono fatty acid esters, alkyl polyglucosides, and alkanolamides; cationic surfactants such as alkyltrimethylammonium chloride; semipolar surfactants such as alkyldimethylamine oxide; organic or inorganic salts such as pyrrolidone carboxylates, citrates, malates, and sodium chloride; acids and alkalis as pH adjusters; disinfectants; chelating agents; antioxidants; blood circulation promoters; ultraviolet absorbers; ultraviolet scattering agents; natural extracts derived from plants and animals; ascorbic acid and its derivatives; flavonoids such as anthocyanins and their derivatives; vitamins; amino acids; photosensitizers; dyes; pigments; fragrances, etc. If the pack cosmetic composition of the present invention contains other components, the content of these components is preferably 20% by mass or less, more preferably 10% by mass, and even more preferably 5% by mass or less, when the total mass of the pack cosmetic composition is 100% by mass. [Examples]

[0041] Embodiments of the present invention will be described in more detail below with reference to examples and comparative examples. Note that the component percentages in Table 1 are in mass%, and represent the converted amount of solid content or active ingredient.

[0042] [Examples 1-5 and Comparative Examples 1-5] Each component in Table 1 was added to purified water in the composition shown in Table 1 and mixed to prepare the cosmetic packs for the examples and comparative examples, and evaluated by the following method.

[0043] The components (d) and (e) in Table 1 were as follows. [Component (d)] Copolymer 1: Monomer (R) represented by formula (1) 1 (R) is a monomer represented by formula (2), n=2) 2 is a methyl group, L 1 is -(C=O)-O- and L 2 It is a binary copolymer obtained from a monomer mixture containing an octadecyl group, and the molar ratio of each monomer is 6:4 for the monomer represented by formula (1) and the monomer represented by formula (2). A commercially available product is "CERACUTE(registered trademark)-L" (manufactured by NOF Corporation, weight-average molecular weight 50,000). [Component (e)] Plant-derived proteoglycan ("Proteoglycan (Plant)" (manufactured by NOF Corporation)) (Weight-average molecular weight = approximately 1,200,000, total aldehyde content = 1.8 μmol equivalent / g) The bentonite included as component (a) is a water-swellable clay mineral, while kaolin and sea silt are non-water-swellable clay minerals.

[0044] <Evaluation Method> Twenty men and women (ages 25-45) participated as panelists. They applied the prepared face pack to their faces and washed it off 10 minutes later. They evaluated the following items: (1) smoothness of spread on the skin, (2) resistance to peeling off the skin, (3) ease of washing off, and (4) smoothness of the skin after washing. The results are shown in Table 1. The evaluation criteria for each evaluation item are shown below.

[0045] (1) Smoothness of spread on the skin Points 2: I felt it spread smoothly. 1 point: I felt it spread a little too smoothly. 0 points: I felt the texture wasn't smooth. The total scores of the 20 participants were calculated and judged as follows. ◎: The total score is 35 points or higher, and no panelists gave a score of 0. (Evaluation) This is a facial pack cosmetic that spreads smoothly and easily. ○: The total score is 30 points or more but less than 35 points, or the total score is 35 points or more and one or more panelists rate it as 0 points. (Evaluation) This is a pack cosmetic that is relatively smooth and easy to spread. △: The total score is between 20 and 30 points. (Judgment) This is a face mask cosmetic that is somewhat difficult to spread smoothly. ×: The total score is less than 19 points. (Judgment) This is a face mask cosmetic that is difficult to spread smoothly.

[0046] (2) Resistance to peeling off the skin 2 points: When I touched the face mask with my finger while it was drying, the mud did not peel off. 1 point: When the face mask was drying, some of the mud flake off when touched with a finger. 0 points: When the face mask dried, the mud peeled off easily when touched with a finger. The total scores of the 20 participants were calculated and judged as follows. ◎: The total score is 35 points or higher, and no panelists gave a score of 0. (Judgment) This is a face mask cosmetic that does not easily peel off the skin. ○: The total score is 30 points or more but less than 35 points, or the total score is 35 points or more and one or more panelists rate it as 0 points. (Evaluation) This is a face mask cosmetic that is very difficult to peel off from the skin. △: The total score is between 20 and 30 points. (Judgment) This is a face mask cosmetic that tends to peel off easily from the skin. ×: The total score is less than 19 points. (Judgment) This is a face mask cosmetic that easily peels off the skin.

[0047] (3) Ease of rinsing Points 2: When I used the shower, I was able to rinse it off without rubbing. 1 point: When I sprayed the shower on it, I was able to wash it off with just a little rubbing. 0 points: When I used the shower, I couldn't rinse it off without scrubbing. The total scores of the 20 participants were calculated and judged as follows. ◎: The total score is 35 points or higher, and no panelists gave a score of 0. (Evaluation) This is a facial pack cosmetic with excellent rinse-off properties. ○: The total score is 30 points or more but less than 35 points, or the total score is 35 points or more and one or more panelists rate it as 0 points. (Evaluation) This is a facial pack cosmetic that is slightly superior in terms of ease of washing off. △: The total score is between 20 and 30 points. (Judgment) This is a face mask cosmetic that is somewhat difficult to rinse off. ×: The total score is less than 19 points. (Judgment) This is a face mask cosmetic that does not rinse off easily.

[0048] (4) Smoothness of the skin after washing 2 points: I felt my skin was smooth after washing. 1 point: I felt my skin was slightly smoother after washing. 0 points: My skin didn't feel smooth after washing. The total scores of the 20 participants were calculated and judged as follows. ◎: The total score is 35 points or higher, and no panelists gave a score of 0. (Evaluation) This is a facial pack cosmetic that provides an excellent smooth feeling. ○: The total score is 25 points or more but less than 35 points, or the total score is 35 points or more and one or more panelists rate it as 0 points. (Evaluation) This is a facial pack cosmetic that provides an excellent smooth feeling. △: The total score is between 15 and 25 points. (Evaluation) This is a facial pack cosmetic that provides a slightly smooth feeling. ×: The total score is less than 15 points. (Judgment) This face mask cosmetic does not provide a sufficiently smooth feeling.

[0049] [Table 1]

[0050] As is clear from the results shown in Table 1, the pack cosmetics of Examples 1-5 could be spread smoothly on the skin, did not peel off easily when dried on the skin, could be rinsed off without rubbing, and left the skin feeling smooth after washing.

[0051] On the other hand, the cosmetic packs in Comparative Examples 1-5 did not achieve sufficient performance. In Comparative Example 1, the amount of ingredient (a) was low, resulting in reduced smoothness of spreadability on the skin and a less smooth feeling of the skin after washing. In Comparative Example 2, the absence of ingredient (b) resulted in reduced smoothness of application on the skin and reduced resistance to peeling. In Comparative Example 3, all evaluation items received low scores because component (c) was not included. In Comparative Example 4, because ingredient (d) was not included, it was easily peeled off the skin, the rinsing effect was reduced, and the effect of leaving the skin smooth after washing was not achieved. In Comparative Example 5, the mass ratio of component (b) to component (d) [(b) / (d)] was too high, resulting in reduced resistance to peeling and insufficient smoothness of the skin after washing. [Industrial applicability]

[0052] The present invention's pack cosmetic can be used as a pack applied to the face, body, etc., with the aim of removing dirt that is difficult to remove with everyday skincare products and further obtaining skin conditioning effects. For example, it can be used as a mud pack that is applied to the face or body and washed off after drying. The present invention's pack cosmetic can be spread smoothly on the skin, not only providing a smooth feeling to the skin after washing, but also being difficult to peel off when dry and being able to be washed off without rubbing, making it suitable for use as a morning facial wash after bathing.

Claims

1. A cosmetic pack containing 10 to 50% by mass of clay mineral (a), 0.1 to 1% by mass of thickening polysaccharide (b), 0.05 to 5% by mass of nonionic surfactant (c) with an HLB of 13 to 16, and 0.0005 to 0.25% by mass of copolymer (d) obtained from a monomer mixture containing monomers represented by the following formulas (1) and (2), wherein the mass ratio of component (b) to component (d) [(b) / (d)] is 1 to 200. 【Chemistry 1】 (In the formula, R １ (where n represents a hydrogen atom or a methyl group, and n is an integer from 1 to 4.) 【Chemistry 2】 (In the formula, R ２ L represents a hydrogen atom or a methyl group. １ Ha-C ６ H ４ -, -C ６ H １０ -, -(C=O)-O-, -(C=O)-NH-, -O-(C=O)-, and L ２ (This represents an alkyl group with 10 to 22 carbon atoms.)

2. Furthermore, the pack cosmetic composition according to claim 1, further comprising proteoglycan (e).

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