Skin cosmetic

Abstract

To provide a skin cosmetic exhibiting excellent stability, in which a film formed after application shows high adsorption performance even with respect to mixed sebum containing unsaturated fatty acids, and which has an effect of keeping the film strong after adsorption of the mixed sebum.SOLUTION: A skin cosmetic containing the following components (A), (B), (C), and (D): (A) a polymer having a cellulose skeleton in which substituents selected from a hydroxypropyl group, a hydroxybutyl group, and an amide group are substituted at 2.4 or more per glucose unit; (B) one or more surfactants selected from alkyl glyceryl ethers and sorbitan fatty acid esters; (C) one or two or more selected from a nonionic surfactant having an HLB of 9 to 20 and an ionic surfactant in an amount of 0.005 to 8 mass%; and (D) water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin cosmetic. [Background technology]

[0002] Among sebum, unsaturated fatty acids such as oleic acid, 8Z-octadecenoic acid, petroselinic acid, vaccenic acid, and palmitoleic acid have been known to cause skin problems such as mild inflammation, rough surfaces including scaling and peeling, lack of smoothness, noticeable irregularities such as pores, makeup breakdown, stickiness, uneven redness, dullness, dullness, lack of brightness, lack of transparency, and increased transepidermal water loss. Various studies have been conducted to improve the effects of unsaturated fatty acids on the skin. For example, Patent Document 1 describes that an emulsion composition containing a polymer having a specific cellulose skeleton, a dihydric alcohol, and one or more compounds selected from sphingosine, a salt of sphingosine, a pseudosphingosine, a salt of pseudosphingosine, an anionic surfactant, and a cationic surfactant has a high effect of suppressing rough skin caused by sebum. Patent Document 2 describes that a cosmetic containing a polymer having a specific cellulose skeleton, a dihydric alcohol, and a water-soluble polymer having a carboxyl group is highly effective in suppressing rough skin caused by sebum. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-104616 [Patent Document 2] Japanese Patent Publication No. 2022-104617 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while conventional cosmetics have a high adsorption effect on unsaturated fatty acids such as oleic acid, they do not have a sufficient adsorption effect on mixed sebum that contains unsaturated fatty acids and also other sebum components actually secreted from skin. Therefore, there has been concern that the adsorption effect on mixed sebum actually secreted from skin and the resulting skin improvement effect are not fully satisfactory. On the other hand, hydroxypropyl cellulose and its derivatives have conventionally been used as water-soluble thickeners in pharmaceuticals, cosmetics, and the like. However, cosmetics containing hydroxypropyl cellulose have stability issues, such as the formation of gels or crystals over time. [Means for solving the problem]

[0005] The present inventors have discovered that by using a combination of a polymer having a specific cellulose skeleton and two or more different surfactants, it is possible to obtain a skin cosmetic that is highly stable, and the film formed after application exhibits a high adsorption effect even on mixed sebum containing unsaturated fatty acids, and that is capable of maintaining the film in a strong state after adsorbing the mixed sebum.

[0006] The present invention relates to a composition comprising the following components (A), (B), (C) and (D): (A) a polymer having a cellulose skeleton in which 2.4 or more substituents selected from hydroxypropyl groups, hydroxybutyl groups, and amide groups are substituted per glucose; (B) one or more surfactants selected from alkyl glyceryl ethers and sorbitan fatty acid esters; (C) 0.005 to 8 mass% of one or more surfactants selected from nonionic surfactants and ionic surfactants having an HLB of 9 to 20; (D)Water The present invention relates to a skin cosmetic containing the compound. [Effects of the Invention]

[0007] The skin cosmetic of the present invention has excellent stability, and the film formed after application exhibits a high adsorption effect even against mixed sebum containing unsaturated fatty acids, and is capable of maintaining the film in a strong state after the mixed sebum has been adsorbed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram showing the evaluation criteria for evaluating sebum adsorption to the formed film in the examples. DETAILED DESCRIPTION OF THE INVENTION

[0009] The component (A) used in the present invention is a polymer having a cellulose skeleton in which 2.4 or more substituents selected from hydroxypropyl groups, hydroxybutyl groups and amide groups are substituted per glucose. Component (A) is a cellulose in which 2.4 or more hydroxyl groups per glucose are substituted with substituents selected from hydroxypropyl groups, hydroxybutyl groups, and amide groups (substitution degree of 2.4 or more), and the substitution degree is preferably 3 or more. Here, the degree of substitution is the average number of substituted hydroxyl groups per glucose. When the substituents, such as hydroxypropyl groups, also contain hydroxyl groups, the hydroxyl groups of these substituents are also etherified during the reaction, and the molar substitution, which is the number of substituents per glucose, becomes greater than 3, for example, for hydroxypropyl groups. Hydroxypropyl cellulose is preferred as component (A) from the viewpoint of improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids. Furthermore, the polymer of component (A) preferably has no substituents other than hydroxypropyl groups, hydroxybutyl groups, and amide groups.

[0010] Furthermore, from the viewpoint of improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, component (A) preferably has an average molecular weight of 40,000 to 2,500,000, more preferably 100,000 to 2,500,000. Here, the average molecular weight is measured by GPC (Gel Permeation Chromatograph).

[0011] Such polymers can be produced, for example, by adding propylene oxide to alkali cellulose activated by alkali mercerization. For example, hydroxypropyl cellulose, which has hydroxypropyl groups as substituents, can be produced by subjecting cellulose to a very complicated activation treatment called alkali cellulose mercerization, in which cellulose is mixed in a slurry state with a large amount of water and a large excess of an alkali metal hydroxide such as sodium hydroxide, and then reacting this alkali cellulose with propylene oxide.

[0012] In addition, as component (A), for example, commercially available products such as HPC-SSL, HPC-SL, HPC-L, HPC-M, HPC-H, and HPC-VH (all manufactured by Nippon Soda Co., Ltd.), KLUCEL MF Pharm, and KLUCEL HPC (manufactured by Ashland Pharmaceuticals) can be used.

[0013] Component (A) can be used alone or in combination of two or more types, and the content is preferably 0.01 to 6 mass% of the total composition, more preferably 0.15 to 5 mass%, and even more preferably 0.3 to 4.5 mass%, from the viewpoints of improving stability, improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, and maintaining the strength of the film after adsorbing mixed sebum containing unsaturated fatty acids.

[0014] Component (B) is one or more surfactants selected from alkyl glyceryl ethers and sorbitan fatty acid esters, and does not include component (C), which will be described later. Examples of alkyl glyceryl ethers include those in which the alkyl group constituting the alkyl glyceryl ether has 8 to 24 carbon atoms, such as mono 2-ethylhexyl glyceryl ether, monodecyl glyceryl ether, monolauryl glyceryl ether, monomyristyl glyceryl ether, monocetyl glyceryl ether, monostearyl glyceryl ether, monoisostearyl glyceryl ether, monooleyl glyceryl ether, and monobehenyl glyceryl ether. Among these, from the viewpoint of improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, the number of carbon atoms in the alkyl group constituting the alkyl glyceryl ether is preferably 12 to 22, more preferably 16 to 18, and even more preferably 18. Furthermore, the alkyl glyceryl ether preferably includes one or more selected from monocetyl glyceryl ether, monostearyl glyceryl ether, monoisostearyl glyceryl ether, monooleyl glyceryl ether, and monobehenyl glyceryl ether, more preferably includes one or more selected from monoisostearyl glyceryl ether and monooleyl glyceryl ether, and even more preferably includes monoisostearyl glyceryl ether.

[0015] Examples of sorbitan fatty acid esters include those in which the fatty acid residue constituting the sorbitan fatty acid ester has 8 to 26 carbon atoms, such as sorbitan monolaurate, sorbitan monomyristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monoisostearate, sorbitan monooleate, sorbitan monobehenate, and sorbitan dioleate. Among these, from the viewpoint of improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, the number of carbon atoms in the fatty acid residue constituting the sorbitan fatty acid ester is preferably 12 to 24, more preferably 16 to 22, even more preferably 16 to 18, and even more preferably 18. Furthermore, the sorbitan fatty acid ester preferably contains one or more selected from sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monoisostearate, and sorbitan monooleate, more preferably one or more selected from sorbitan monostearate, sorbitan monoisostearate, and sorbitan monooleate, even more preferably one or more selected from sorbitan monoisostearate and sorbitan monooleate, and even more preferably sorbitan monoisostearate.

[0016] From the viewpoint of improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, component (B) preferably contains an alkyl glyceryl ether, more preferably contains one or more selected from monoisostearyl glyceryl ether and monooleyl glyceryl ether, and even more preferably contains monoisostearyl glyceryl ether.

[0017] Component (B) can be used alone or in combination of two or more types, and from the viewpoints of improving stability, improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, and maintaining the strength of the film after adsorbing mixed sebum containing unsaturated fatty acids, the content is preferably 0.005 to 5 mass% of the total composition, more preferably 0.2 to 4.3 mass%, and even more preferably 0.3 to 3.5 mass%.

[0018] In the present invention, the mass ratio (B) / (A) of component (B) to component (A) is preferably 0.1 to 10, more preferably 0.3 to 8, even more preferably 0.5 to 5.4, and even more preferably 1.3 to 2.8, from the viewpoints of improving stability, improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, and maintaining the strength of the film after adsorbing mixed sebum containing unsaturated fatty acids.

[0019] Component (C) is one or more selected from nonionic surfactants and ionic surfactants having an HLB of 9 to 20. Note that component (C) does not include the aforementioned component (B). Of the component (C), the nonionic surfactant having an HLB of 9 to 20 is preferably one having an HLB of 10 to 18, more preferably one having an HLB of 12 to 16, from the viewpoint of improving stability. Examples of such nonionic surfactants include polyoxyethylene hydrogenated castor oils such as polyoxyethylene hydrogenated castor oil (40 E.O.), polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene alkanol ethers, polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan fatty acid ester (20 E.O.), polyglycerin fatty acid esters, and sucrose fatty acid esters. Of these, from the viewpoint of improving stability, it is preferable to contain one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyglycerin fatty acid ester, more preferable to contain one or more selected from polyoxyethylene hydrogenated castor oil and polyoxyethylene sorbitan fatty acid ester, and even more preferable to contain polyoxyethylene sorbitan fatty acid ester.

[0020] Among the component (C), the ionic surfactants include anionic surfactants, cationic surfactants, and amphoteric surfactants. Examples of anionic surfactants include those used in ordinary cosmetics, such as fatty acid salts (preferably fatty acid salts having 12 to 24 carbon atoms) such as sodium laurate, potassium palmitate, and arginine stearate; alkyl sulfate salts (preferably alkyl sulfate salts having 12 to 24 carbon atoms) such as sodium lauryl sulfate, potassium lauryl sulfate, and sodium cetyl sulfate; polyoxyethylene alkyl ether sulfate salts (preferably polyoxyethylene alkyl ether sulfate salts having 12 to 24 carbon atoms) such as polyoxyethylene lauryl ether triethanolamine sulfate; N-acyl sarcosine salts (preferably N-acyl sarcosine salts having an acyl group having 12 to 24 carbon atoms) such as sodium lauroyl sarcosine; alkyl phosphates (preferably alkyl phosphates having 12 to 24 carbon atoms) such as sodium monostearyl phosphate; and polyoxyethylene oleyl ether sodium phosphate and polyoxyethylene stearyl ether sodium phosphate. polyoxyethylene alkyl ether phosphates (preferably polyoxyethylene alkyl ether phosphates having 12 to 24 carbon atoms); dialkyl sulfosuccinates (preferably di(alkyl)sulfosuccinates having 6 to 12 carbon atoms) such as sodium di(2-ethylhexyl) sulfosuccinate; N-alkyloylmethyl taurine salts (preferably having an alkyloyl group having 12 to 24 carbon atoms) such as sodium N-stearoyl-N-methyl taurine and sodium N-myristoyl-N-methyl taurine. N-acyl glutamates (preferably N-acyl glutamates having an acyl group having 12 to 24 carbon atoms) such as monosodium N-lauroyl-L-glutamate, sodium N-myristoyl-L-glutamate, sodium N-stearoyl-L-glutamate, disodium N-stearoyl-L-glutamate, potassium N-stearoyl-L-glutamate, and arginine N-stearoyl-L-glutamate.

[0021] Among these anionic surfactants, from the viewpoint of improving stability, it is preferable to include one or more selected from N-acyl glutamic acid salts having an acyl group with 12 to 24 carbon atoms, fatty acid salts having 12 to 24 carbon atoms, polyoxyethylene alkyl ether phosphates having 12 to 24 carbon atoms, and N-alkyloylmethyl taurine salts having an alkyloyl group with 12 to 24 carbon atoms; it is more preferable to include one or more selected from N-acyl glutamic acid salts having an acyl group with 12 to 24 carbon atoms and N-alkyloylmethyl taurine salts having an alkyloyl group with 12 to 24 carbon atoms; it is even more preferable to include N-acyl glutamic acid salts having an acyl group with 12 to 20 carbon atoms; it is even more preferable to include N-stearoyl-L-glutamic acid salts; and it is particularly preferable to include sodium N-stearoyl-L-glutamate. The anionic surfactant may be a commercially available product or may be synthesized according to a conventional method.

[0022] The cationic surfactants are those commonly used in cosmetics, such as quaternary ammonium salt cationic surfactants and amine salt cationic surfactants, with quaternary ammonium salt cationic surfactants being preferred. Examples of amine salt cationic surfactants include alkylamine salts.

[0023] Examples of cationic surfactants include alkyltrimethylammonium salts such as octyltrimethylammonium chloride, decyltrimethylammonium chloride, lauryltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, stearyltrimethylammonium chloride, and behenyltrimethylammonium chloride; dialkyldimethylammonium salts such as didecyldimethylammonium chloride and distearyldimethylammonium chloride; and trialkylmethylammonium salts. Of these cationic surfactants, it is preferable to include one or more selected from dialkyldimethylammonium salts, more preferably one or more selected from didecyldimethylammonium chloride and distearyldimethylammonium chloride, and even more preferably distearyldimethylammonium chloride. The cationic surfactant may be a commercially available product or one synthesized according to a conventional method.

[0024] Furthermore, amphoteric surfactants include those used in ordinary cosmetics, such as alkyldimethylamine oxide, alkylcarboxybetaine, alkylsulfobetaine, amide amino acid salts, and alkylamidopropylbetaine, with alkylamidopropylbetaine being preferred.

[0025] From the viewpoint of improving stability, component (C) preferably contains one or more surfactants selected from nonionic surfactants, anionic surfactants, and cationic surfactants having an HLB of 9 to 20, more preferably one or more surfactants selected from nonionic surfactants and anionic surfactants having an HLB of 9 to 20, and even more preferably a nonionic surfactant having an HLB of 9 to 20. Furthermore, from the viewpoint of improving stability, component (C) preferably contains one or more selected from polyoxyethylene sorbitan fatty acid esters, quaternary ammonium salt-type cationic surfactants, and N-acyl glutamates, more preferably contains one or more selected from polyoxyethylene sorbitan fatty acid esters (20 E.O.), distearyldimethylammonium chloride, and sodium N-stearoyl-L-glutamate, even more preferably contains one or more selected from polyoxyethylene sorbitan fatty acid esters (20 E.O.) and distearyldimethylammonium chloride, and still more preferably contains polyoxyethylene sorbitan fatty acid esters (20 E.O.).

[0026] Component (C) can be used alone or in combination of two or more types, and the content is preferably 0.005 to 8 mass% of the total composition, more preferably 0.2 to 7 mass%, even more preferably 0.3 to 5 mass%, and even more preferably 0.8 to 3.5 mass%, from the viewpoints of improving stability, improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, and maintaining the strength of the film after adsorbing mixed sebum containing unsaturated fatty acids.

[0027] Furthermore, when an anionic surfactant is contained as component (C), the content of the anionic surfactant in the total composition is preferably 0.005 to 3 mass%, more preferably 0.05 to 2 mass%, and even more preferably 0.1 to 1.5 mass%, from the viewpoint of improving stability. When an anionic surfactant is contained as component (C), the content of the anionic surfactant indicates the content as a salt.

[0028] In the present invention, the mass ratio (A) / (C) of component (A) to component (C) is preferably 0.05 to 10, more preferably 0.1 to 3, even more preferably 0.17 to 0.8, and even more preferably 0.26 to 0.57, from the viewpoints of improving stability, improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, and maintaining the strength of the film after adsorbing mixed sebum containing unsaturated fatty acids.

[0029] In the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.05 to 20, more preferably 0.1 to 10, even more preferably 0.4 to 2.8, and even more preferably 0.57 to 1.2, from the viewpoints of improving stability, improving the adsorption effect of the film formed after application on mixed sebum containing unsaturated fatty acids, and maintaining the strength of the film after adsorbing mixed sebum containing unsaturated fatty acids.

[0030] The content of water in component (D) is preferably 70 to 99 mass %, more preferably 86 to 98 mass %, of the total composition from the viewpoints of improving stability and ease of use.

[0031] In addition to the above-mentioned components, the skin cosmetic of the present invention may contain components used in ordinary cosmetics, such as oily components, polymeric compounds other than the component (A), nonionic surfactants other than the components (B) and (C), powders, antioxidants, fragrances, preservatives, pH adjusters, blood circulation promoters, cooling agents, antiperspirants, disinfectants, skin activators, moisturizers, and refreshing agents.

[0032] The skin cosmetic of the present invention can be produced according to a conventional method. For example, component (A) and a portion of the water are mixed and stirred at a high temperature, and after confirming that the mixture is homogeneous, the mixture is cooled to room temperature to prepare an aqueous solution containing component (A). Components (B) and (C) are mixed and stirred at a high temperature until homogeneous, and the remaining water is then added at a high temperature, mixed and stirred, and after confirming that the mixture is homogeneous, the mixture is cooled to room temperature. The skin cosmetic can then be produced by mixing and stirring the aqueous solution containing component (A) with the other components at room temperature.

[0033] The skin cosmetic of the present invention is suitable as a leave-on type skin cosmetic such as a lotion, a beauty serum, a milky lotion, a cream, an ultraviolet protection agent, a makeup base, or a foundation. The skin cosmetic of the present invention is preferably in a liquid form and is suitable as a lotion or a beauty serum, more preferably as a beauty serum. The reason why the skin cosmetic of the present invention has such a high adsorption effect on mixed sebum containing unsaturated fatty acids is not fully understood, but it is thought that by combining components (A), (B), and (C) of the present invention, the film formed after application can selectively solidify the unsaturated fatty acids in the mixed sebum, and therefore, can also solidify the sebum components actually secreted from the skin. [Example]

[0034] Examples 1 to 13 and Comparative Examples 1 to 3 Skin cosmetics were produced with the compositions shown in Table 1, and the stability (gelation), stability (crystallization), sebum adsorption to the formed film, and film strength after sebum adsorption were evaluated. The results are also shown in Table 1.

[0035] (Manufacturing method) (1) Preparation of hydroxypropyl cellulose aqueous solution: Hydroxypropyl cellulose powder as component (A) was added to a portion of water as component (D) heated to 80°C, and after stirring uniformly, the mixture was slowly cooled to 25°C to prepare an aqueous hydroxypropyl cellulose solution. (2) Preparation of cosmetics: Components (B) and (C) were heated and mixed at 80°C to dissolve them. The remaining component (D), water, was heated to 80°C and added, and the mixture was stirred and mixed uniformly, then cooled to 25°C. The aqueous hydroxypropyl cellulose solution prepared in (1) was then added and stirred to obtain a skin cosmetic.

[0036] (Evaluation method) (1) Stability (gelation): Each skin cosmetic was filled in 20 mL into a transparent glass container (Mighty Vial No. 6, Maruemu Co., Ltd.) and stored in a storage cabinet at 45°C for two weeks. After that, it was removed from the storage cabinet at 45°C and left to stand in a storage cabinet at 25°C for four hours, and the stability (gelation) was evaluated according to the following criteria: 3 and 2 were considered pass. In addition, since Comparative Example 3 does not contain component (C), in "(2) Preparation of Cosmetic Preparation" described in the manufacturing method, a portion of the water of component (D) at 80°C was added to component (B) heated to 80°C, but the mixture did not become homogeneous. Therefore, it was judged "unmanufacturable." Furthermore, because it was "unmanufacturable," the evaluations of (2) to (4) were judged "unrated." 3: No gel. 2: It has a gel consistency, but it becomes homogenous when shaken. 1: There is a gel, but it does not become uniform even when shaken.

[0037] (2) Stability (crystal): Each skin cosmetic was filled in 20 mL into a transparent glass container (Mighty Vial No. 6, Maruemu Co., Ltd.) and stored in a 5°C storage cabinet for two weeks. After that, it was removed from the 5°C storage cabinet and left to stand in a 25°C storage cabinet for four hours. The stability (crystallization) was observed under an optical microscope (40x magnification) and evaluated according to the following criteria: 4 and 3 were considered pass. 4: No crystals. 3: Very few crystals present. 2: A few crystals present. 1: Crystals clearly present.

[0038] (3) Evaluation of sebum adsorption to the formed film: (3-1) 400 mg (20 mg / cm) of each skin care product was applied to the entire surface of a 76 mm × 26 mm slide glass (model number: S2111, manufactured by Matsunami Glass Industry Co., Ltd.). 2 ) was applied evenly. (3-2) The slide glass of (3-1) was left standing at 25°C and a relative humidity of 50% for 24 hours, and the skin cosmetic applied to the slide glass was dried to form a coating film.

[0039] (3-3) 20 μL of each of the following four types of mixed sebum (all containing oleic acid (OA), an unsaturated fatty acid) was dropped onto the coating film dried on the glass slide in (3-2). The mixed sebum was colored red by adding Sudan III (a red colorant) to the mixed sebum at a concentration of 0.1% by mass. The red coloring was done so that it would be possible to visually confirm whether or not the coating film onto which the mixed sebum had been dropped remained when the dried coating film was wiped with a paper cloth (Kimtowel, manufactured by Nippon Paper Crecia Co., Ltd.), which is the operation to be performed in the next step (3-4). Mixed sebum A: 10% by weight of oleic acid (OA), 45% by weight of triglyceride (TAG), 45% by weight of squalane (SQ), ·Mixed sebum B: OA 30% by mass, TAG 35% by mass, SQ 35% by mass, ·Mixed sebum C: OA 50% by mass, TAG 25% by mass, SQ 25% by mass, ·Mixed sebum D: OA 70% by mass, TAG 15% by mass, SQ 15% by mass,

[0040] (3-4) Five minutes after the procedure in (3-3), the entire glass slide in (3-3) was wiped with a paper cloth (Kimtowel, manufactured by Nippon Paper Crecia Co., Ltd.) with a certain amount of force, and the presence or absence of the coating film on the glass slide where the mixed sebum had been dropped was visually evaluated based on the presence or absence of red coloration. If the red color remains on the slide, it indicates that the coating has retained the mixed sebum (trapped the sebum). If the red color does not remain, it indicates that the coating cannot retain the mixed sebum. Furthermore, the more coloring remains even when the ratio of oleic acid (OA) in the mixed sebum is low (mixed sebum A), the higher the ability to retain the mixed sebum (sebum trapping ability) is.

[0041] (3-5) The number of red spots remaining on the mixed sebum on the slide glass was evaluated according to the following criteria (see Figure 1). 5: All red colors of mixed sebum A, B, C, and D remain. (High sebum trapping ability) 4: The red color of mixed sebum B, C, and D remains. 3: The red color of mixed sebum C and D remains. 2: Red color remains only in mixed sebum D. 1: No red color remains in any of the mixed sebum A, B, C, and D (low sebum trapping ability)

[0042] (4) Film strength after sebum absorption: Of the films after sebum adsorption (3-4), the film after dropping mixed sebum D was pressed with the pad of a finger to evaluate the strength of the film after sebum adsorption according to the following criteria. The hardness of the film before sebum adsorption was evaluated as "4: The film is hard." In addition, for Comparative Examples 1 and 2, the result of "(3) Evaluation of sebum adsorption to the formed film" was "1", and evaluation was not possible, so it was marked as "not rated". 4: The membrane is hard. 3: The membrane is somewhat hard. 2: The membrane is soft. 1: The membrane is very soft.

[0043] [Table 1]

[0044] *1 Hydroxypropyl cellulose: HPC-H (manufactured by Nippon Soda Co., Ltd.), *2 Hydroxypropyl cellulose: HPC-L (manufactured by Nippon Soda Co., Ltd.), *3 Hydroxypropyl cellulose: HPC-SSL (Nippon Soda Co., Ltd.) *4 Monoisostearyl glyceryl ether: GE-IS (Kao Corporation) HLB2, *5 Polyoxyethylene sorbitan monostearate (20E.O.): Rheodol TW-S120V (Kao Corporation) HLB 14.9, *6 Distearyldimethylammonium chloride: VARISOFT TA 100 (manufactured by Evonik Operations GmbH), *7 Sodium N-stearoyl-L-glutamate: Amisoft HS-11P (manufactured by Ajinomoto Co., Inc.),

[0045] Prescription examples 1-4 The skin cosmetics having the compositions shown in Tables 2 and 3 are all highly stable, and the films formed after application exhibit a high adsorption effect even against mixed sebum containing unsaturated fatty acids, and have the effect of maintaining the film in a strong state after the mixed sebum has been adsorbed.

[0046] [Table 2]

[0047] [Table 3]

[0048] *8 Isostearic acid: Isostearic acid EX (manufactured by Kokyu Alcohol Kogyo Co., Ltd.), *9 N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide: Sphingolipid E ​​(Kao Corporation) *10 Polyoxyethylene hydrogenated castor oil (40E.O.): Emanon CH-40 (Kao Corporation) HLB 12.5, *11 Dipropylene glycol: DPG-RF (ADEKA), *12 Glycerin: 86% Glycerin V (glycerin 86% by mass, water 14% by mass) (Kao Corporation), *13 Phenoxyethanol: Hysorb EPH (manufactured by Toho Chemical Industry Co., Ltd.), *14 Acrylic acid / alkyl methacrylate copolymer: Pemulen TR-1 (manufactured by Lubrizol Advanced Materials, Inc.) *15 Polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3B.O.) (8E.O.) (5P.O.): Wilbride S-753 (manufactured by NOF Corporation), *16 Disodium edetate: Clewat N (manufactured by Nagase & Co., Ltd.), *17 Sorbitol solution: Kao sorbitol (70% by mass of sorbitol, 30% by mass of water) (Kao Corporation), *18 Roman chamomile extract: Roman chamomile extract BG-50 (manufactured by Koei Kogyo Co., Ltd.), *19 Eucalyptus extract: Eucalyptus extract BG (Maruzen Pharmaceuticals)

Claims

1. The following components (A), (B), (C), and (D): (A) a polymer having a cellulose skeleton in which 2.4 or more substituents selected from hydroxypropyl groups, hydroxybutyl groups, and amide groups are substituted per glucose; (B) one or more surfactants selected from alkyl glyceryl ethers and sorbitan fatty acid esters; (C) 0.005 to 8 mass% of one or more surfactants selected from nonionic surfactants and ionic surfactants having an HLB of 9 to 20, (D) Water A skin cosmetic containing

2. 2. The skin cosmetic according to claim 1, wherein the mass ratio (A) / (C) of component (A) to component (C) is 0.05 to 10.

3. 3. The skin cosmetic according to claim 1, wherein the mass ratio (B) / (A) of component (B) to component (A) is 0.1 to 10.

4. 3. The skin cosmetic according to claim 1, wherein component (C) comprises one or more surfactants selected from the group consisting of polyoxyethylene sorbitan fatty acid esters, quaternary ammonium salt-type cationic surfactants, and N-acyl glutamates.

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