Skin cosmetic composition

Abstract

This invention relates to a cosmetic composition for skin and a cosmetic film for skin. The cosmetic composition for skin contains solvent A, solvent B, and polymer C. Solvent A has a boiling point below 99°C and a Hansen solubility parameter Ra of solvent A relative to water of 36 or less. Solvent B has a boiling point above 150°C and a Hansen solubility parameter Ra of solvent B relative to water of 40 or more. Solvent B is miscible with solvent A, and polymer C is soluble in solvent A but insoluble in solvent B.

Description

[0001] (This application is a divisional application of patent application No. 201980080859.9, filed on November 22, 2019, entitled "Cosmetic Composition for Skin".) Technical Field

[0002] This invention relates to a cosmetic composition for skin and a cosmetic film for skin. Background Technology

[0003] Currently, in order to cover dull skin or improve the brightness after coating, the method used is to mix inorganic pigments with high hiding power, such as titanium dioxide, zinc oxide, and iron oxide, into skin cosmetics and other skin cosmetics.

[0004] For example, Japanese Patent Application Publication No. 2016-121137 (Patent Document 1) describes a cosmetic product that aims to provide cosmetics with high whiteness or coverage, and contains titanium dioxide with an average particle size of 0.2 μm or more and resin microparticles with an average particle size of 0.01 to 100 μm.

[0005] In addition, Japanese Patent No. 2015-520120 (Patent Document 2) discloses a cosmetic composition that aims to provide long-term and continuous coverage for skin imperfections, etc., and contains in a physiologically acceptable medium: a plate-shaped filler having a specified refractive index and particle size, an organosilicon elastomer, and a filler having an oil absorption capacity of 1 ml / g or more. Summary of the Invention

[0006] The present invention relates to the following [1].

[0007] [1] A skin cosmetic composition comprising solvent A, solvent B, and polymer C, wherein,

[0008] The boiling point of solvent A is below 99°C, and the distance Ra of solvent A relative to water, as expressed by the Hansen solubility parameter in equation (1) below, is less than 36.

[0009] The solvent B has a boiling point of 150°C or higher, and the distance Ra of the solvent B relative to the Hansen solubility parameter of water as expressed by the following formula (1) is 40 or higher.

[0010] Solvent B is miscible with solvent A, and polymer C is soluble in solvent A but insoluble in solvent B.

[0011] Ra=(4×ΔD 2 +ΔP 2 +ΔH 2 ) 0.5 (1)

[0012] ΔD: The difference between the solvent and water in the dispersive component of Hansen's solubility parameter.

[0013] ΔP: The difference between the dipole component of the Hansen solubility parameter and that of the solvent and water.

[0014] ΔH: The difference between the hydrogen-bonded component of the solvent and water in the Hansen solubility parameter. Detailed Implementation

[0015] In the technologies of Patent Documents 1 and 2, whiteness is achieved by mixing inorganic pigments with high refractive index. However, in recent years, the use of zinc oxide and titanium oxide has been increasingly restricted due to various regulations. Therefore, it is desirable to develop skin cosmetic compositions that have high whiteness and excellent coverage even without the use of inorganic pigments.

[0016] This invention relates to a cosmetic composition for skin and a cosmetic film for skin. Although the cosmetic composition for skin does not use inorganic pigments, it has high whiteness and excellent coverage.

[0017] The inventors have discovered that by using two solvents and a polymer with specified boiling points, setting the Hansen solubility parameters of these two solvents relative to water within a specified range, and setting the compatibility of the two solvents and the solubility of the polymer in the solvents to specific relationships, it is possible to achieve high whiteness and improved opacity even without the use of inorganic pigments.

[0018] That is, the present invention relates to the following [1] and [2].

[0019] [1] A skin cosmetic composition comprising solvent A, solvent B, and polymer C, wherein,

[0020] The boiling point of solvent A is below 99°C, and the distance Ra of solvent A relative to water, as expressed by the Hansen solubility parameter in equation (1) below, is less than 36.

[0021] The solvent B has a boiling point of 150°C or higher, and the distance Ra of the solvent B relative to the Hansen solubility parameter of water as expressed by the following formula (1) is 40 or higher.

[0022] Solvent B is miscible with solvent A, and polymer C is soluble in solvent A but insoluble in solvent B.

[0023] Ra=(4×ΔD 2 +ΔP 2 +ΔH 2 ) 0.5 (1)

[0024] ΔD: The difference between the solvent and water in the dispersive component of Hansen's solubility parameter.

[0025] ΔP: The difference between the dipole component of the Hansen solubility parameter and that of the solvent and water.

[0026] ΔH: The difference between the hydrogen-bonded component of the solvent and water in the Hansen solubility parameter.

[0027] [2] A skin cosmetic film formed from the skin cosmetic composition described in [1] above.

[0028] According to the present invention, a cosmetic composition and a cosmetic film for skin can be provided. The cosmetic composition for skin does not use inorganic pigments, but has high whiteness and excellent coverage.

[0029] [Skin-specific cosmetic compositions]

[0030] The skin cosmetic composition of the present invention (hereinafter also referred to as "cosmetic composition") is a cosmetic composition containing solvent A, solvent B and polymer C. Solvent A has a boiling point below 99°C and a distance Ra of the Hansen solubility parameter of solvent A relative to water as expressed by the following formula (1) is 36 or less. Solvent B has a boiling point of 150°C or more and a distance Ra of the Hansen solubility parameter of solvent B relative to water as expressed by the following formula (1) is 40 or more. Solvent B is miscible with solvent A, and polymer C is soluble in solvent A but insoluble in solvent B.

[0031] Ra=(4×ΔD 2 +ΔP 2 +ΔH 2 ) 0.5 (1)

[0032] ΔD: The difference between the solvent and water in the dispersive component of Hansen's solubility parameter.

[0033] ΔP: The difference between the dipole component of the Hansen solubility parameter and that of the solvent and water.

[0034] ΔH: The difference between the hydrogen-bonded component of the solvent and water in the Hansen solubility parameter.

[0035] In this invention, "miscibility" refers to the phenomenon that solvent A and solvent B are mutually soluble in a mixed system containing solvent A and solvent B. Solvent A and solvent B are considered to be in a miscible state if they do not separate into multiple phases when mixed and left to stand, or if they do not separate into phases and produce turbidity when mixed and stirred.

[0036] In addition, polymer C is a substance that is soluble in solvent A but insoluble in solvent B, and also dissolves in the cosmetic composition.

[0037] In this invention, "polymer C is soluble in solvent A" means that when polymer C is dried at 105°C for 2 hours, the amount dissolved is 5g or more when dissolved in 100g of solvent A at 25°C, achieving a constant amount. From the viewpoint of improving whiteness and opacity, the above-mentioned amount of dissolution is preferably 10g or more.

[0038] In this invention, "polymer C is insoluble in solvent B" means that when a constant amount of polymer C is dissolved in 100g of solvent B at 25°C for 2 hours after drying at 105°C until saturation, the amount dissolved is less than 5g. From the viewpoint of improving whiteness and opacity, the above-mentioned amount of dissolution is preferably less than 2g.

[0039] The above determination of whether they are "miscible" or "soluble" was performed at 25°C.

[0040] In this invention, the "Hansen solubility parameters" are represented by three components (dispersion component D, dipole component P, and hydrogen bonding component H) of the solubility parameters (SP values) imported by Hildebrand. The D, P, and H values ​​for each solvent are detailed in the "Hansen Solubility Parameters" in the second edition of the user's handbook. Additionally, the HSP values ​​for various solvents or resins are also recorded in Wesley L. Archer's "Industrial Solvents Handbook," among other publications.

[0041] The D, P, and H of each solvent can also be determined using the HSPiP software from Charles Hansen Consulting, Inc. (Horsholm, Denmark, hansen-solubility.com).

[0042] In this invention, for solvents registered in the HSP version 4.1.03 database (references to various HSPs), the values ​​registered in the database are used; for solvents not in the database, the values ​​calculated from the HSP are used.

[0043] According to the present invention, a cosmetic composition exhibiting high whiteness and excellent covering power can be provided even without the use of inorganic pigments. The reason for this is uncertain, but is believed to be as follows.

[0044] The cosmetic composition of the present invention contains solvent A and solvent B, which have different boiling points and distances Ra from the Hansen solubility parameter relative to water, and polymer C, which is soluble in solvent A but insoluble in solvent B.

[0045] When this cosmetic composition is applied to the skin, the evaporation of solvent A within the coating film competes for heat of vaporization, causing atmospheric moisture to condense on the surface of the coating film and adhere as tiny water droplets. In this invention, since the solubility parameters of solvents A and B relative to water are within a specific range, solvent B, which is miscible with solvent A, undergoes phase separation through the adhesion of this water. Furthermore, the inventors believe that since polymer C is insoluble in solvent B, polymer C coats the phase-separated solvent B, inhibiting the fusion of solvent B, thereby forming primary particles with a core-shell structure, in which solvent B is the core and polymer C is the shell. Further, the inventors believe that with the evaporation of solvent A and the surface of the formed primary particles becoming flush, regularly separated cellular convection structures, known as Benard cells, are generated within the coating film. Through Benard convection within each cell, the primary particles aggregate to form a cosmetic coating film of secondary particles. As a result, the inventors speculate that light scattering occurs due to the particulate structure formed within the cosmetic coating, resulting in high whiteness and improved opacity.

[0046] <Solvent A>

[0047] The cosmetic composition of the present invention contains solvent A.

[0048] Solvent A has a boiling point below 99°C, and the distance Ra of solvent A relative to water as expressed by the Hansen solubility parameter in formula (1) above is less than 36. Furthermore, solvent A is miscible with solvent B, and solvent A dissolves polymer C. Therefore, when the cosmetic composition is applied to the skin, as solvent A evaporates, the heat of vaporization is dissipated, and tiny water droplets adhere to the surface of the coating film, resulting in phase separation of solvent A and solvent B.

[0049] From the viewpoint of forming primary particles, improving whiteness and opacity, the boiling point of solvent A is below 99°C, preferably below 98°C, more preferably below 90°C, and even more preferably below 80°C. Moreover, from the viewpoint of applicability, it is preferably above 50°C, more preferably above 60°C, and even more preferably above 70°C.

[0050] From the viewpoint of forming primary particles, improving whiteness and opacity, the distance Ra of solvent A relative to the Hansen solubility parameter of water is 36 or less, preferably 32 or less, more preferably 30 or less, even more preferably 28 or less, even more preferably 26 or less, and preferably 10 or more, more preferably 15 or more, even more preferably 20 or more, and even more preferably 22 or more.

[0051] Regarding solvent A, one solvent can be used alone or in combination with two or more solvents. The boiling point and the distance Ra relative to the Hansen solubility parameter of water when using two or more solvents A can be obtained as a weighted average weighted by the content (mass%) of each solvent.

[0052] Solvent A is preferably a monohydric alcohol with 1 or more but less than 4 carbon atoms, such as ethanol, propanol, isopropanol, and tert-butanol. From the viewpoint of improving whiteness and opacity, it is preferable to select at least one of ethanol, propanol, isopropanol, and tert-butanol, and more preferably ethanol.

[0053] <Solvent B>

[0054] The cosmetic composition of the present invention contains solvent B.

[0055] Solvent B has a boiling point of 150°C or higher, and the distance Ra of solvent B relative to the Hansen solubility parameter of water expressed by the above formula (1) is 40 or higher. In addition, solvent B is miscible with solvent A, and solvent B does not dissolve polymer C. As a result, when tiny water droplets adhere to the surface of the coating film due to the evaporation of solvent A, phase separation of solvent A and solvent B occurs, forming primary particles of solvent B coated with polymer C.

[0056] From the viewpoint of forming primary particles, improving whiteness and opacity, the boiling point of solvent B is 150°C or higher, preferably 155°C or higher, more preferably 160°C or higher, even more preferably 165°C or higher, and even more preferably 170°C or higher. Moreover, from the viewpoint of applicability, it is preferably 300°C or lower, more preferably 270°C or lower, even more preferably 250°C or lower, even more preferably 230°C or lower, even more preferably 210°C or lower, and even more preferably 180°C or lower.

[0057] From the viewpoint of forming primary particles, improving whiteness and opacity, the distance Ra of the Hansen solubility parameter of solvent B relative to water is 40 or more, preferably 42 or more, more preferably 44 or more, and preferably 60 or less, more preferably 57 or less, and even more preferably 55 or less.

[0058] Regarding solvent B, one can be used alone or in combination with two or more solvents. The boiling point and the distance Ra relative to the Hansen solubility parameter of water when using two or more solvents B can be obtained as a weighted average weighted by the content (mass%) of each solvent.

[0059] From the viewpoint of improving whiteness and opacity, solvent B preferably contains at least one selected from hydrocarbon oils and silicone oils.

[0060] Examples of hydrocarbon oils include: α-olefin oligomers, liquid paraffin; liquid isoalkanes such as isododecane, isohexadecane, and hydrogenated polyisobutylene, heavy liquid alkanes, liquid ozokerite, squalane, pteroscarane, and squalene, preferably liquid isoalkanes, and more preferably one or more selected from isododecane and hydrogenated polyisobutylene.

[0061] The weight-average molecular weight of the hydrocarbon oil is preferably 150 or more, more preferably 160 or more, and preferably 1000 or less, more preferably 500 or less, and even more preferably 300 or less.

[0062] The viscosity of hydrogenated polyisobutylene at 20°C is preferably 0.5 mPa·s or more, more preferably 0.7 mPa·s or more, even more preferably 1 mPa·s or more, and preferably 30 mPa·s or less, more preferably 25 mPa·s or less, even more preferably 20 mPa·s or less. The viscosity of hydrogenated polyisobutylene at 20°C can be measured using an E-type viscometer according to the method described in the examples.

[0063] Examples of silicone oils include: linear silicone oils such as trisiloxane; branched silicone oils such as methyl polytrimethylsiloxane; and cyclic silicone oils such as methyl cyclopolysiloxane. Among these, trisiloxane and methyl polytrimethylsiloxane are preferred.

[0064] The weight-average molecular weight of the silicone oil is preferably 150 or more, more preferably 160 or more, and preferably 1000 or less, more preferably 500 or less, and even more preferably 300 or less.

[0065] The viscosity of the silicone oil at 25°C is preferably 0.5 mPa·s or higher, more preferably 20 mPa·s or lower, more preferably 10 mPa·s or lower, even more preferably 5 mPa·s or lower, and even more preferably 3 mPa·s or lower. The viscosity of the silicone oil at 25°C can be measured using an E-type viscometer according to the method described in the examples.

[0066] Regarding solvent B, in addition to containing hydrocarbon oil or silicone oil, it may further contain additives such as moisturizers, ultraviolet absorbers, insect repellents, anti-wrinkle agents, fragrances, and dyes.

[0067] When solvent B contains at least one of hydrocarbon oils and silicone oils selected from those with a weight average molecular weight of 150 or more and 1000 or less, from the viewpoint of improving whiteness and opacity, the content of at least one of hydrocarbon oils and silicone oils selected from those with a weight average molecular weight of 150 or more and 1000 or less in solvent B is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more.

[0068] <Polymer C>

[0069] In this invention, polymer C coats the already phase-separated solvent B, which facilitates the formation of primary particles.

[0070] Regarding polymer C, there are no particular restrictions as long as it is soluble in solvent A and insoluble in solvent B.

[0071] Examples of polymer C include: anionic polymers, cationic polymers, betaine polymers, and other ionic polymers; nonionic polymers, etc.

[0072] [Anionic polymers]

[0073] Anionic polymers possess anionic groups. Examples of such anionic groups include carboxyl groups (-COOM), sulfonic acid groups (-SO3M), and phosphate groups (-OPO3M2), which exhibit acidity by dissociating and releasing hydrogen ions; or these dissociated ionic forms (-COO... - -SO3 - -OPO3 2- -OPO3 - M), etc. In the above chemical formulas, M represents a hydrogen atom, an alkali metal, ammonium, or an organic ammonium.

[0074] The anionic polymer is preferably an anionic polymer CI (hereinafter also referred to as "anionic polymer CI") containing structural units derived from monomers having acidic groups.

[0075] The monomer having an acidic group is preferably a monomer having a carboxyl group, more preferably at least one selected from (meth)acrylic acid, butenoic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid and 2-methacryloyloxymethylsuccinic acid, and even more preferably (meth)acrylic acid.

[0076] Here, "(meth)acrylic acid" means at least one selected from acrylic acid and methacrylic acid.

[0077] The anionic polymer CI is preferably a copolymer that further contains structural units derived from monomers other than those having acidic groups. Examples of other monomers include: hydrophobic monomers such as (meth)acrylates having hydrocarbon groups derived from aliphatic alcohols and monomers containing aromatic groups; and nonionic monomers.

[0078] Here, "(meth)acrylate" means one or more selected from acrylates and methacrylates.

[0079] (Meth)acrylates having a hydrocarbon group derived from an aliphatic alcohol are (meth)acrylates having a hydrocarbon group derived from an aliphatic alcohol having 1 or more and 22 or less, more preferably 1 or more and 12 or less, and even more preferably 1 or more and 8 or less. Examples of such (meth)acrylates include: (meth)acrylates having a straight-chain alkyl group; (meth)acrylates having a branched-chain alkyl group; and (meth)acrylates having an alicyclic alkyl group.

[0080] As a monomer containing an aromatic group, it is preferably a vinyl monomer having or not having a heteroatom-containing substituent and having an aromatic group having 6 or more and 22 or fewer carbon atoms, more preferably at least one selected from styrene monomers and (meth)acrylates containing aromatic groups. The molecular weight of the monomer containing the aromatic group is preferably less than 500.

[0081] Examples of styrene monomers include: styrene, α-methylstyrene, 2-methylstyrene, vinyltoluene, and divinylbenzene.

[0082] Examples of (meth)acrylates containing aromatic groups include: phenyl (meth)acrylate, benzyl (meth)acrylate, and phenoxyethyl (meth)acrylate.

[0083] Examples of nonionic monomers in anionic polymers CI include: (meth)acrylamide; N-vinyl-2-pyrrolidone; diacetone acrylamide; N-alkyl (meth)acrylamide; hydroxyalkyl (meth)acrylates; polyalkylene glycol (meth)acrylates (n = 2–30, where n represents the average molar number of oxyalkylene additions. The same applies below.); alkoxy polyalkylene glycol (meth)acrylates (n = 1–30); phenoxy (ethylene glycol-propylene glycol copolymer) (n = 1–30, where ethylene glycol: n = 1–29) (meth)acrylates, etc.

[0084] Specific examples of commercially available nonionic monomers include: NK ESTER M-20G, NK ESTER M-40G, NK ESTER M-90G, and NK ESTER M-230G from Shin-Nakamura Chemical Industry Co., Ltd.; BLEMMER PE-90, BLEMMER PE-200, and BLEMMER PE-350 from Nippon Oil Co., Ltd.; PME-100, PME-200, and PME-400; PP-500, PP-800, and PP-1000; AP-150, AP-400, and AP-550; and 50PEP-300, 50POEP-800B, and 43PAPE-600B.

[0085] Each of the above-mentioned monomers can be used individually or in combination of two or more.

[0086] The weight-average molecular weight of the anionic polymer CI is preferably 5,000 or more, more preferably 10,000 or more, even more preferably 20,000 or more, and preferably 1,000,000 or less, more preferably 500,000 or less, and even more preferably 200,000 or less. The weight-average molecular weight of the anionic polymer CI is the molecular weight converted from polystyrene as determined by gel permeation chromatography (GPC).

[0087] Commercially available anionic polymers include: acrylic acid / alkyl acrylate / (N-alkyl)acrylamide copolymers such as Ultra Hold8, Ultra Hold-Strong, and Ultra Hold-Power (all from BASF Corporation, Japan) and Amphomer V-42 (National Starch Corporation); carboxylated vinyl polymers such as Carbopol 980 and Carbopol 981 (all from Lubrizol Advanced Materials); (meth)acrylic acid / (meth)acrylic acid alkyl acrylate copolymers such as DIAHOLD (Mitsubishi Chemical Corporation); (acrylic acid / diacetone acrylamide) copolymers AMP or (acrylic acid / alkyl acrylate / diacetone acrylamide) copolymers AMP such as Plus Size L-53P, L-75CB, L-9540B, L-6466, and L-3200B (Mitsubishi Chemical Industries, Ltd.); and (meth)acrylic acid / alkyl acrylate / polyvinylpyrrolidone copolymers such as Luviflex VBM35 (BASF Corporation).

[0088] For anionic polymer CI, it is preferable to contain structural units derived from monomers having acidic groups and structural units derived from alkyl (meth)acrylates, more preferably structural units derived from monomers having acidic groups, structural units derived from alkyl (meth)acrylates, and structural units derived from (N-alkyl)(meth)acrylamide, further preferably (meth)acrylate / (meth)acrylate / (N-alkyl)(meth)acrylamide copolymer, and even more preferably acrylic acid / alkyl acrylate / (N-alkyl)acrylamide copolymer.

[0089] [Catonic polymers]

[0090] In this invention, the term "cationic" in cationic polymers means the following: when an unneutralized polymer is dispersed or dissolved in pure water, the pH is greater than 7; in the case of polymers containing quaternary ammonium groups, when their counter ion is dispersed or dissolved in pure water as a hydroxide ion, the pH is greater than 7; or when the polymer or the like is insoluble in pure water and the pH cannot be definitively measured, the zeta potential of the dispersion dispersed in pure water is positive.

[0091] The cationic polymer preferably has basic groups such as primary to tertiary amino groups, quaternary ammonium groups, and hydrazine groups, and more preferably has quaternary ammonium groups.

[0092] It should be noted that basic groups include those that have been neutralized by acids such as hydrochloric acid, sulfuric acid, nitric acid, acetic acid, formic acid, maleic acid, fumaric acid, citric acid, tartaric acid, adipic acid, and lactic acid.

[0093] Examples of cationic polymers include: natural cationic polymers and synthetic cationic polymers.

[0094] Natural cationic polymers are polymers obtained from natural sources through extraction, purification, and other processes, as well as substances obtained by chemically modifying these polymers. Examples include substances with glucose residues on their polymer backbone. Specifically, examples include: cationic guar gum; cationic tara gum; cationic locust bean gum; cationic cellulose; cationic hydroxyalkyl cellulose; and cationic starch.

[0095] Examples of synthetic cationic polymers include: polyethyleneimine, polyallylamine or their acid neutralizations, polyethylene glycol-polyamine condensates, cationic polyvinyl alcohol, cationic polyvinylpyrrolidone, cationic organosilicon polymers, 2-(dimethylamino)ethyl methacrylate polymers or their acid neutralizations, poly(trimethyl-2-methacryloyloxyethyl ammonium chloride), amine / epimyl alcohol copolymers, N,N-dimethylaminoethyl methacrylate diethyl methacrylate sulfate / vinylpyrrolidone copolymers, N,N-dimethylaminoethyl methacrylate diethyl methacrylate sulfate / N,N-dimethylacrylamide / dimethacrylate polyethylene glycol copolymers, and polydiallyl... Dimethylammonium chloride, diallyldimethylammonium chloride / acrylamide copolymer, diallyldimethylammonium chloride / sulfur dioxide copolymer, diallyldimethylammonium chloride / hydroxyethyl cellulose copolymer, 1-allyl-3-methylimidazolium chloride / vinylpyrrolidone copolymer, alkylamino(meth)acrylate / vinylpyrrolidone copolymer, alkylamino(meth)acrylate / vinylpyrrolidone / vinylcaprolactam copolymer, (3-(meth)acrylamidopropyl)trimethylammonium chloride / vinylpyrrolidone copolymer, alkylaminoalkylacrylamide / alkylacrylamide / (meth)acrylate / polyethylene glycol (meth)acrylate copolymer, etc. These substances can be used alone or in combination of two or more.

[0096] Preferably, the cationic polymer CII-1 (hereinafter also referred to as "cationic polymer CII-1") and the cationic organosilicon polymer CII-2 contain structural units derived from monomers having basic groups.

[0097] [Catonic polymer CII-1]

[0098] The cationic polymer CII-1 contains structural units derived from monomers having basic groups. Examples of such basic groups are the same as those described above.

[0099] Examples of monomers containing basic groups include: alkylamino (meth)acrylates, N,N-dialkylaminoalkyl (meth)acrylates, N-[3-(dimethylamino)propyl](meth)acrylamide, diallyl dialkylammonium, and other amino-containing monomers, their acid neutralizations, or their quaternary ammonium compounds. These substances can be used alone or in combination of two or more.

[0100] Examples of acids used for acid neutralization include hydrochloric acid, sulfuric acid, nitric acid, acetic acid, formic acid, maleic acid, fumaric acid, citric acid, tartaric acid, adipic acid, and lactic acid. Examples of quaternizing agents include halogenated alkanes such as chloromethane, chloroethane, bromomethane, and iodomethane, as well as alkylating agents such as dimethyl sulfate, diethyl sulfate, and di-n-propyl sulfate.

[0101] As the cationic polymer CII-1, it is preferably a homopolymer of a monomer having a basic group, a copolymer or condensation polymer of a monomer having a basic group and other monomers besides the monomer having a basic group, more preferably a copolymer of a monomer having a basic group and other monomers besides the monomer having a basic group, further preferably a copolymer containing structural units derived from a monomer having a basic group, structural units derived from hydrophobic monomers listed in the above-mentioned anionic polymers CI, and structural units derived from nonionic monomers listed in the above-mentioned anionic polymers CI, even more preferably a copolymer containing structural units derived from amino-containing monomers, structural units derived from alkyl (meth)acrylates, structural units derived from N-alkyl (meth)acrylamide, and structural units derived from alkoxy polyethylene glycol mono(meth)acrylates. The cationic polymer CII-1 is manufactured by copolymerizing raw material monomers containing these monomers using known polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization, and emulsion polymerization. Among these polymerization methods, solution polymerization is preferred.

[0102] From the perspective of improving whiteness and opacity, the contents of monomers with basic groups, hydrophobic monomers, and nonionic monomers in the raw materials used to manufacture cationic polymer CII-1 (as unneutralized content, the same applies below), i.e., the contents of structural units derived from each component in cationic polymer CII-1, are as follows.

[0103] The content of monomers having basic groups is preferably 3% by mass or more, more preferably 5% by mass or more, even more preferably 7% by mass or more, and preferably 35% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, and even more preferably 20% by mass or less.

[0104] The content of the hydrophobic monomer is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and preferably 35% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less.

[0105] The content of nonionic monomers is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, and preferably 85% by mass or less, more preferably 80% by mass or less, and even more preferably 75% by mass or less.

[0106] From the viewpoint of improving whiteness and opacity, the weight-average molecular weight of the cationic polymer CII-1 is preferably 5,000 or more, more preferably 7,000 or more, even more preferably 10,000 or more, even more preferably 50,000 or more, even more preferably 100,000 or more, and preferably 1,000,000 or less, more preferably 500,000 or less, even more preferably 300,000 or less, and even more preferably 200,000 or less.

[0107] The weight-average molecular weight of the cationic polymer CII-1 can be determined using the method described in the examples.

[0108] [Catonic organosilicon polymer CII-2]

[0109] The cationic organosilicon polymer CII-2 is preferably a poly(N-acylalkyleneimide) / organopolysiloxane copolymer comprising an organopolysiloxane segment (x) (hereinafter also simply referred to as "segment (x)") and a poly(N-acylalkyleneimide) segment (y) (hereinafter also simply referred to as "segment (y)"), wherein the segment (y) is composed of an alkylene group (which contains a cationic nitrogen atom bonded to at least one silicon atom of the above-mentioned segment (x)) and repeating units of the N-acylalkyleneimide represented by the following general formula (1-1).

[0110]

[0111] In the formula, R 1 It represents a hydrogen atom, an alkyl group with 1 or more and 22 or less carbon atoms, an aryl group with 6 or more and 22 or less carbon atoms, or an aralkyl group or an alkylaryl group with 7 or more and 22 or less carbon atoms, where a is 2 or 3.

[0112] As R 1 The alkyl group is preferably an alkyl group with 1 or more and 12 or less carbon atoms, and more preferably an alkyl group with 1 or more and 3 or less carbon atoms, such as methyl, ethyl, n-propyl, or isopropyl.

[0113] As R 1 Aryl groups can be exemplified by phenyl, naphthyl, etc.

[0114] As R 1 Aryl groups can be exemplified by phenylalkyl groups, naphthylalkyl groups, etc., in which the alkyl group has 1 or more and 20 or less carbon atoms. Alkyl aryl groups can be exemplified by alkylphenyl groups, alkylnaphthyl groups, etc., in which the alkyl group has 1 or more and 20 or less carbon atoms.

[0115] There is no particular limitation on the degree of aggregation of the repeating unit represented by the general formula (1-1) in the chain segment (y), for example, preferably 1 or more and 500 or less, more preferably 6 or more and 100 or less.

[0116] Examples of organopolysiloxanes that form chain segment (x) include compounds represented by the following general formulas (1-2).

[0117]

[0118] (where R is in the formula) 2 This refers to alkyl, phenyl, or nitrogen-containing alkyl groups with 1 or more but less than 22 carbon atoms, and multiple R... 2 They may be the same or different, but at least one is an alkyl group containing a cationic nitrogen atom. b is 100 or higher and 5000 or lower.

[0119] In general formula (1-2), in R 2 Among the alkyl groups represented by carbon atoms with 1 or more and 22 or less, alkyl groups with 1 or more and 12 or less carbon atoms are preferred, alkyl groups with 1 or more and 3 or less carbon atoms are more preferred, and methyl groups are even more preferred.

[0120] Additionally, as R 2 The nitrogen-containing alkyl group referred to is preferably an alkyl group containing 1 or more but less than 3 nitrogen atoms and having 2 or more but less than 20 carbon atoms. Regarding the nitrogen-containing alkyl group, it is acceptable as long as it is located on at least one silicon atom at the end of the organopolysiloxane or on at least one silicon atom in the side chain. The number of nitrogen-containing alkyl groups in the organopolysiloxane is preferably 1 or more but less than 300, more preferably 1 or more but less than 100.

[0121] In general formula (1-2), b is preferably 100 or more and 2,000 or less, and more preferably 350 or more and 1,500 or less.

[0122] The weight-average molecular weight of the organopolysiloxane forming the chain segment (x) is preferably 1,000 or more, more preferably 10,000 or more, even more preferably 30,000 or more, and preferably 1,000,000 or less, more preferably 500,000 or less, and even more preferably 200,000 or less.

[0123] In the bonding of segments (x) and (y), the nitrogen-containing alkylene atoms in between are preferably alkylene atoms containing 1 or more and 3 or less of nitrogen atoms and having a carbon atom number of 2 or more and 20 or less.

[0124] Specifically, nitrogen atoms present between carbons or at the end of an alkylene chain can be exemplified as: (i) secondary or tertiary amines, (ii) ammonium salts with hydrogen ions added to them, and (iii) quaternary ammonium salts.

[0125] As a poly(N-acylalkyleneimide) / organopolysiloxane copolymer, it is preferably a substance in which a segment (y) is bonded to at least one of the silicon atoms at the end of the segment (x) or the side chain via an alkylene group containing a cationic nitrogen atom.

[0126] From the viewpoint of improving whiteness and opacity, the mass ratio of the content of segment (x) to the total content of segments (x) and segments (y) in the poly(N-acylalkylimide) / organopolysiloxane copolymer, i.e., [content of segment (x) / [total content of segments (x) and segments (y)], is preferably 0.1 or more, more preferably 0.3 or more, further preferably 0.4 or more, even more preferably 0.5 or more, and preferably 0.99 or less, more preferably 0.95 or less, and even more preferably 0.9 or less.

[0127] In this specification, the mass ratio [content of segment (x) / [total content of segment (x) and segment (y)] is the ratio of the mass (Mx) of segment (x) to the total mass (My) of segment (x) and segment (y) in the poly(N-acylalkylimide) / organopolysiloxane copolymer.

[0128] The mass ratio [content of segment (x) / [total content of segment (x) and segment (y)] can be calculated by dissolving 5% by mass of poly(N-acylalkylimide) / organopolysiloxane copolymer in deuterated chloroform and analyzing it using nuclear magnetic resonance (1H-NMR), based on the integral ratio of alkyl or phenyl groups in segment (x) and methylene groups in segment (y).

[0129] From the viewpoint of improving whiteness and opacity, the weight-average molecular weight of the poly(N-acylalkylimide) / organopolysiloxane copolymer is preferably 10,000 or more, more preferably 50,000 or more, even more preferably 70,000 or more, and preferably 1,000,000 or less, more preferably 500,000 or less, and even more preferably 200,000 or less. The weight-average molecular weight of the poly(N-acylalkylimide) / organopolysiloxane copolymer can be calculated from the weight-average molecular weight of the organopolysiloxane forming segment (x) and the aforementioned mass ratio [content of segment (x) / [total content of segment (x) and segment (y)]].

[0130] Preferred examples of poly(N-acylalkyleneimide) / organopolysiloxane copolymers include: poly(N-formylethyleneimide) / organopolysiloxane copolymers, poly(N-acetylethyleneimide) / organopolysiloxane copolymers, poly(N-propionylethyleneimide) / organopolysiloxane copolymers, etc.

[0131] Poly(N-acylalkylimide) / organopolysiloxane copolymers can be obtained, for example, by reacting a ring-opening polymer of a cyclic imine ether, namely poly(N-acylalkylimide), with an organopolysiloxane forming a segment (x). More specifically, for example, they can be obtained by the method described in Japanese Patent Application Publication No. 2011-126978. The poly(N-acylalkylimide) / organosiloxane copolymer used as the cationic organosilicon polymer CII-2 can be used alone or in combination of two or more.

[0132] [Betaine polymer]

[0133] Examples of betaine polymers in this invention include: copolymers of monomers having anionic groups and monomers having cationic groups, polymers or copolymers of betaine monomers, substances incorporating anionic groups into cationic polymers, and substances incorporating the aforementioned basic groups into anionic polymers. Preferably, polymers containing betaine structures on their side chains are preferred, and more preferably, betaine polymer CIII containing structural units derived from betaine monomers.

[0134] As a betaine monomer, it is preferably a monomer containing a betaine structure and a (meth)acrylamide structure, more preferably at least one selected from carboxybetaine monomers, sulfobetaine monomers and phosphate betaine monomers, and even more preferably a carboxybetaine monomer.

[0135] Examples of betaine polymers include: polymethacryloylethyl dimethyl betaine, N-methacryloyloxyethyl-N,N-dimethylammonium-α-N-methylcarboxybetaine / alkyl methacrylate copolymer, methacryloylethyl dimethyl betaine / methacryloylethyl trimethylammonium chloride / 2-hydroxyethyl methacrylate copolymer, methacryloylethyl dimethyl betaine / methacryloylethyl trimethylammonium chloride / methacrylic acid / methoxy polyethylene glycol copolymer, and octylacrylamide / acrylate / butylaminoethyl methacrylate copolymer. Among these, N-methacryloyloxyethyl-N,N-dimethylammonium-α-N-methylcarboxybetaine / alkyl methacrylate copolymer is preferred.

[0136] From the viewpoint of improving whiteness and opacity, the weight-average molecular weight of the betaine polymer is preferably 5,000 or more, more preferably 10,000 or more, and more preferably 1,000,000 or less, more preferably 500,000 or less, and even more preferably 300,000 or less. The weight-average molecular weight of the betaine polymer is the molecular weight converted from polystyrene as determined by gel permeation chromatography (GPC).

[0137] Commercially available betaine polymers include, for example: PLASCIEZE L-410W, PLASCIEZE L-402W, PLASCIEZE L-440, PLASCIEZE L-440W, PLASCIEZE K-450, PLASCIEZE L-450W (all manufactured by Mitsubishi Chemical Industry Co., Ltd., trade names); YUKAFORMER SM, YUKAFORMER 301 (all manufactured by Mitsubishi Chemical Co., Ltd., trade names); RAM RESIN-1000, RAM RESIN-2000, RAM RESIN-3000, RAM RESIN-4000 (all manufactured by Osaka Organic Chemical Industry Co., Ltd., trade names); MERQUAT PLUS3330 (manufactured by Lubrizol Co., Ltd., trade name); Amphomer 28-4910, Amphomer LV-71 (all manufactured by Akzo...). Manufactured by Nobel Co., Ltd., trade name), etc.

[0138] [Nonionic polymers]

[0139] Examples of nonionic polymers include polymers with structural units derived from nonionic monomers, water-soluble polysaccharides (cellulose, rubber, starch, etc.) and their derivatives.

[0140] Examples of nonionic monomers in nonionic polymers include: (meth)acrylates having a hydrocarbon group derived from an aliphatic alcohol with 1 to 22 carbon atoms; N-vinyl-2-pyrrolidone; vinyl alcohol; polyalkylene glycol (meth)acrylates (n=1 to 30); alkoxy polyalkylene glycol mono(meth)acrylates (n=1 to 30); (meth)acrylamide and its derivatives, etc.

[0141] Furthermore, nonionic polymers may contain structural units derived from monomers other than nonionic monomers. Examples of such monomers include: the styrene monomers mentioned above; (meth)acrylates containing aromatic groups mentioned above; vinyl acetate, etc.

[0142] Examples of nonionic polymers include: polyvinyl alcohol, polyvinyl acetal, polyurethane polyurea, polyvinylpyrrolidone, vinylpyrrolidone / vinyl acetate copolymers and copolymers of vinylpyrrolidone and other nonionic monomers; cellulose polymers such as hydroxyalkyl cellulose; polyethylene glycol, polypropylene glycol, polyglycerol, polyvinyl alcohol, amylopectin, guar gum, poly(N,N-dimethylacrylamide), poly(N-vinylacetamide), poly(N-vinylformamide), and poly(2-alkyl-2-oxazoline). Polyvinyl acetal and polyurethane polyurea are preferred among these.

[0143] Commercially available nonionic polymers include: SLEC B series (manufactured by Sekisui Chemicals Co., Ltd., trade name) and other polyvinyl butyral; BAYCUSAN series (manufactured by Covestro Nippon Co., Ltd., trade name) and other polyurethane polyurea; HEC DAICEL SE900, HEC DAICEL SE850, HEC DAICEL SE600, HEC DAICEL SE550, HEC DAICEL SE400 (manufactured by DAICEL FINECHEM Co., Ltd., trade name) and other hydroxyethyl cellulose; POLYOX WSRN-12, POLYOX WSRN-60K, POLYOX WSR-301 (manufactured by Dow Chemical Co., Ltd., trade name) and other high-polymer polyethylene glycols; and polyethylene oxide PEO-27, polyethylene oxide PEO-18, polyethylene oxide PEO-15, polyethylene oxide PEO-8 (manufactured by Sumitomo Chemical Co., Ltd., trade name, polyethylene oxide). Oxide); Luviskol K90, Luviskol K80, Luviskol K30 (all manufactured by BASF, trade names) and other polyvinylpyrrolidone; GOHSENOL series (all manufactured by Nippon Synthetic Chemicals Co., Ltd., trade names) and other polyvinyl alcohol, etc.

[0144] In this invention, from the viewpoint of improving whiteness and opacity, the amount of polymer C dissolved in water is measured by the amount of polymer C dissolved in 100g of water at 25°C until saturation after drying at 105°C for 2 hours to a constant amount. Preferably, it is less than 5g.

[0145] It should be noted that, when polymer C is an anionic polymer, the above-mentioned solubility refers to the amount dissolved when the anionic groups of polymer C are 100% neutralized with sodium hydroxide. When polymer C is a cationic polymer, the above-mentioned solubility refers to the amount dissolved when the cationic groups of the polymer are 100% neutralized with hydrochloric acid.

[0146] In this invention, from the viewpoint of improving whiteness and opacity, polymer C is preferably an amphiphilic polymer that is compatible with solvent B even if it is insoluble in solvent B, and is also compatible with water. More preferably, it is an ionic polymer. More preferably, it comprises a polymer containing at least one monomeric structural unit selected from monomers having acidic groups, monomers having basic groups, and betaine monomers. Even more preferably, it contains at least one selected from anionic polymer C1, cationic polymer C1I-1, cationic organosilicon polymer C1I-2, and betaine polymer CIII.

[0147] The polymer C is preferably composed of two or more polymers, more preferably containing anionic polymer CI and at least one selected from cationic polymer CII-1, cationic organosilicon polymer CII-2 and betaine polymer CIII, further preferably containing anionic polymer CI and cationic polymer CII-1 or betaine polymer CIII, and even more preferably containing anionic polymer CI and betaine polymer CIII.

[0148] The viscosity of the cosmetic composition at 20°C is preferably 1 mPa·s or more, more preferably 5 mPa·s or more, even more preferably 10 mPa·s or more, and preferably 1,000 mPa·s or less, more preferably 700 mPa·s or less, even more preferably 300 mPa·s or less, even more preferably 100 mPa·s or less, even more preferably 50 mPa·s or less, and even more preferably 30 mPa·s or less. The viscosity of the cosmetic composition at 20°C was measured using the method described in the examples.

[0149] In the cosmetic composition of the present invention, optional components may include dyes, organic pigments, inorganic pigments, ultraviolet scattering agents, ultraviolet absorbers, fragrances, cosmetic ingredients, pharmaceutical ingredients, pH adjusters, moisturizers, antioxidants, bactericides, preservatives, and other ingredients used in cosmetic compositions. These substances may be used individually or in combination of two or more.

[0150] (Manufacturing of cosmetic compositions)

[0151] Regarding the cosmetic composition, it can be obtained by mixing and stirring solvent A, solvent B, polymer C, and the aforementioned optional ingredients as needed. There are no particular restrictions on the mixing order, but it is preferable to include the following steps: first, mixing solvent A and polymer C to dissolve polymer C in solvent A to obtain a solution of polymer C, and then adding solvent B to this solution. The aforementioned optional ingredients can be further added and mixed as needed.

[0152] From the viewpoint of improving whiteness and coverage, the content of each component in the cosmetic composition of the present invention is as follows.

[0153] The content of solvent A in the cosmetic composition is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and preferably 90% by mass or less, more preferably 85% by mass or less, and even more preferably 80% by mass or less.

[0154] The content of solvent B in the cosmetic composition is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, and preferably 40% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less.

[0155] The mass ratio of solvent A to solvent B in the cosmetic composition [solvent A / solvent B] is preferably 0.01 or more, more preferably 0.1 or more, even more preferably 0.5 or more, even more preferably 1 or more, even more preferably 1.5 or more, even more preferably 2 or more, and preferably 50 or less, more preferably 30 or less, even more preferably 10 or less, even more preferably 7 or less, and even more preferably 5 or less.

[0156] The content of polymer C in the cosmetic composition is preferably 2% by mass or more, more preferably 3% by mass or more, even more preferably 4% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 8% by mass or less.

[0157] When polymer C contains anionic polymer CI and at least one selected from cationic polymer CII-1, cationic organosilicon polymer CII-2, and betaine polymer CIII, the total content of anionic polymer CI and at least one selected from cationic polymer CII-1, cationic polymer CII-2, and betaine polymer CIII in polymer C, or the total content of anionic polymer CI, cationic polymer CII-1, cationic organosilicon polymer CII-2, and betaine polymer CIII in polymer C, is preferably 60% by mass or more, more preferably 70% by mass or more, further preferably 80% by mass or more, even more preferably 90% by mass or more, and preferably 100% by mass or less, even more preferably 100% by mass.

[0158] When polymer C contains anionic polymer CI and betaine polymer CIII, the mass ratio of the content of anionic polymer CI to betaine polymer CIII [content of anionic polymer CI / content of betaine polymer CIII] is preferably 0.1 or more, more preferably 0.3 or more, further preferably 0.5 or more, even more preferably 0.7 or more, and preferably 9 or less, more preferably 5 or less, even more preferably 3 or less, and even more preferably 2 or less.

[0159] The mass ratio of the content of polymer C in the cosmetic composition to the total content of solvent A and solvent B [polymer C / (solvent A + solvent B)] is preferably 0.01 or more, more preferably 0.03 or more, even more preferably 0.05 or more, and preferably 1 or less, more preferably 0.5 or less, even more preferably 0.3 or less, even more preferably 0.2 or less, and even more preferably 0.1 or less.

[0160] The content of inorganic pigments in the cosmetic composition of the present invention is preferably 10% by mass or less, more preferably 5% by mass or less, further preferably 3% by mass or less, even more preferably 1% by mass or less, and even more preferably 0% by mass.

[0161] The cosmetic composition of the present invention can be applied to skin other than hair, preferably any part of the face, hands, feet, body, etc., and is preferably applied by application. This gives the skin a natural glow.

[0162] The cosmetic composition of this invention can be used as a base cosmetic, foundation, concealer; sunscreen lotion, sunscreen cream and other UV protection cosmetics; blush, eyeshadow cream, mascara, eyeliner, eyebrow pencil, topical application, lipstick and other color cosmetics; facial cleanser, cleansing cosmetics and other skin cleansing cosmetics; beauty serum, face mask, massage cosmetics and other basic cosmetics, etc. It is particularly suitable for use as a base cosmetic, foundation, etc.

[0163] As a dosage form of the cosmetic composition of the present invention, it can be applied to creams, gels, lotions, solutions, pastes, solids, multilayers, etc., and can also be further applied to tablets, sprays, and mousses.

[0164] [Skin Cosmetic Mask]

[0165] The skin-use cosmetic film of the present invention is formed from the above-described cosmetic composition.

[0166] The above-mentioned cosmetic film can be formed by applying the cosmetic composition to the skin surface using the method commonly used when applying a cosmetic composition to the skin under the temperature and humidity conditions of daily life, and then drying the coating film under atmospheric pressure.

[0167] The preferred amount of the cosmetic composition applied to the skin is 1 mg / cm³. 2 The above, more preferably 2 mg / cm³ 2 The above is further preferred to be 3 mg / cm³. 2 The above, and preferably 10 mg / cm³ 2 The following is more preferably 7 mg / cm³ 2 The following is a further preferred value: 5 mg / cm³ 2the following.

[0168] The thickness of the coating film before drying (hereinafter also referred to as "wet film thickness") is preferably 10 μm or more, more preferably 20 μm or more, even more preferably 30 μm or more, and preferably 300 μm or less, more preferably 200 μm or less, even more preferably 100 μm or less, and even more preferably 50 μm or less.

[0169] In this invention, the drying method for the coating film can be carried out sufficiently by natural drying at skin temperature, or by air drying, warm air drying, etc., from the viewpoint of accelerating drying.

[0170] When using warm air drying, there is no particular limitation on the temperature of the warm air, but it is preferably above 40°C, more preferably above 50°C, even more preferably above 55°C, and preferably below 80°C, more preferably below 70°C, and even more preferably below 65°C.

[0171] The drying time of the coated film is preferably 5 minutes or more, more preferably 7 minutes or more, even more preferably 10 minutes or more, and preferably 30 minutes or less, more preferably 20 minutes or less.

[0172] During the drying of the coated film, from the viewpoint of improving whiteness and opacity, it is preferable to use a device that generates tiny droplets containing water, thereby spraying these droplets onto the skin surface. This allows for rapid phase separation of solvent A and solvent B, promoting the formation of primary particles of solvent B coated by polymer C. There are no particular limitations on the device for generating the tiny droplets; for example, a jet atomizing device, an ultrasonic atomizing device, or a screen atomizing device can be used.

[0173] The liquid in a spray contains water, but it may also contain other liquids besides water.

[0174] As other liquids, monohydric alcohols with 1 or more but less than 4 carbon atoms are preferred, such as ethanol, propanol, isopropanol, and tert-butanol. Among these, from the viewpoint of improving whiteness and opacity, at least one selected from ethanol, propanol, isopropanol, and tert-butanol is preferred, and ethanol is more preferred.

[0175] The water content in the sprayed liquid is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 90% by mass or more, and preferably 100% by mass or less, and even more preferably 100% by mass.

[0176] The preferred amount of micro-droplets imparted by the spray is 0.01 mg / cm³. 2 The above, more preferably 0.05 mg / cm³ 2The above is further preferred to be 0.1 mg / cm³. 2 The above, and preferably 10 mg / cm³ 2 The following is more preferably 7 mg / cm³ 2 The following is a further preferred value: 5 mg / cm³ 2 the following.

[0177] The average particle size of the sprayed micro-droplets is preferably 0.01 μm or more, more preferably 0.1 μm or more, even more preferably 1 μm or more, and preferably 50 μm or less, more preferably 30 μm or less, and even more preferably 10 μm or less.

[0178] [Example]

[0179] In the following synthesis examples, manufacturing examples, embodiments, and comparative examples, unless otherwise specified, "parts" and "%" refer to "parts by mass" and "% by mass". The following methods were used to determine the physical properties of the polymers.

[0180] (1) Determination of the weight-average molecular weight of cationic polymer CII-1

[0181] The solutions containing phosphoric acid and lithium bromide were dissolved in N,N-dimethylformamide at concentrations of 60 mmol / L and 50 mmol / L, respectively, as eluents. Gel permeation chromatography (GPC apparatus (HLC-8320GPC) manufactured by Tosoh Corporation, columns manufactured by Tosoh Corporation (TSKgel Super AWM-H, TSKgel Super AW3000, TSKgelguardcolumn Super AW-H), flow rate: 1 mL / min) was used as standards. Monodisperse polystyrene reagent kits with known molecular weights [PStQuick B (F-550, F-80, F-10, F-1, A-1000), PStQuick C (F-288, F-40, F-4, A-5000, A-500), manufactured by Tosoh Corporation] were used as standards for determination.

[0182] 0.1 g of cationic polymer CII-1 was mixed with 10 mL of the above eluent in a glass vial and stirred with a magnetic stirrer at 25 °C for 10 hours. The mixture was then filtered through a syringe filter (DISMIC-13HP PTFE 0.2 μm, manufactured by Advantech Co., Ltd.) and used as the test sample.

[0183] (2) Determination of the number-average molecular weight of poly(N-propionyl ethylimide)

[0184] Using 1 mmol / L FRAMIN DM20 (trade name, manufactured by Kao Corporation) / chloroform as the eluent, gel permeation chromatography was performed [analytical column: two Showa Denko columns (K-804L) connected in series, flow rate: 1 mL / min, column temperature: 40 °C, detector: differential refractometer], with polystyrene of known molecular weight as the standard. 100 μL of the sample was used at a concentration of 5 mg / mL.

[0185] (3) Viscosity determination

[0186] The viscosity was measured using an RE80 E-type viscometer manufactured by Toki Sangyo Co., Ltd., with a standard rotor (1°34'×R24), at a measurement time of 1 minute and a rotation speed of 100 rpm.

[0187] It should be noted that when measuring viscosity, hydrogenated polyisobutylene was measured at 20°C, silicone oil at 25°C, and cosmetic compositions at 20°C.

[0188] (4) Determine the wet film thickness using bar coating.

[0189] In an indoor environment where temperature and humidity were controlled at 25°C and 50%, a pre-measured weight of A4-sized transparent PET film (Toray Industries, Inc., trade name: Lumirror T60, film thickness 75μm) was placed on a benchtop coating machine (Mitsui Electric Machinery Co., Ltd., trade name: TC-1). A wire rod for confirming the wetted film thickness was fixed in place. Next, approximately 2-6 ml of a mixed solution of 10% ethanol, 50% water, and 40% glycerol was added dropwise using a dropper. Using the immediately set wire rod, the mixed solution was applied to the PET film at a moving speed of 1 m per minute. It was confirmed that during coating, the mixed solution was evenly distributed across the entire surface of the PET film, with liquid overflowing from the ends. The weight of the coated PET film was then immediately measured, and the wetted film thickness using the wire rod was calculated by correcting for the specific gravity of the mixed solution.

[0190] Detailed information about each ingredient is as follows.

[0191] (Anionic polymer CI)

[0192] Ultra Hold8: Acrylic acid / alkyl acrylate / (N-alkyl)acrylamide copolymer (manufactured by BASF Japan Co., Ltd., trade name: Ultra Hold8), 100% solid powder.

[0193] Ultra HoldStrong: Acrylic acid / alkyl acrylate / (N-alkyl)acrylamide copolymer (manufactured by BASF Japan Co., Ltd., trade name: Ultra HoldStrong), 100% solid powder.

[0194] Ultra HoldPower-dry: A powder obtained by drying a solution (32% solids) of acrylic acid / alkyl acrylate / (N-alkyl)acrylamide copolymer (manufactured by BASF Japan Co., Ltd., trade name: Ultra HoldPower).

[0195] (Catonic polymer CII-1)

[0196] Cationic polymer 1: The copolymer obtained in the following synthesis example 1.

[0197] Cationic polymer 2: The copolymer obtained in the following synthesis example 2.

[0198] (Cationic organosilicon polymer CII-2)

[0199] Cationic organosilicon polymer 1: Poly(N-propionylethyleneimine) / dimethylpolysiloxane copolymer obtained in Synthesis Example 3 below.

[0200] Cationic organosilicon polymer 2: Poly(N-propionylethyleneimine) / dimethylpolysiloxane copolymer obtained in Synthesis Example 4 below.

[0201] Cationic organosilicon polymer 3: Poly(N-propionylethyleneimine) / dimethylpolysiloxane copolymer obtained in Synthesis Example 5 below.

[0202] (Betaine Polymer CIII)

[0203] A powder obtained by drying an ethanol solution (30% solids) of YUKAFORMER SM-dry: N-methacryloyloxyethyl-N,N-dimethylammonium-α-N-methylcarboxylic betaine / alkyl methacrylate copolymer (manufactured by Mitsubishi Chemical Corporation, trade name: YUKAFORMER SM).

[0204] (Nonionic polymer)

[0205] Polyvinyl butyral: SLEC BM-1 (Sekisui Chemicals Co., Ltd., trade name), 100% solid powder.

[0206] Polyurethane polyurea: A powder obtained by drying BAYCUSAN C2000 (Covestro Japan Co., Ltd., trade name, solid component of polyurethane-64 40% ethanol solution).

[0207] (Solvent B)

[0208] [hydrocarbon oil]

[0209] PARLEAM3: Hydrogenated polyisobutylene (manufactured by Nippon Oil Co., Ltd., trade name: PARLEAM3, boiling point 179℃, Ra45, viscosity 1.4 mPa·s)

[0210] PARLEAM4: Hydrogenated polyisobutylene (manufactured by Nippon Oil Co., Ltd., trade name: PARLEAM4, boiling point 262℃, Ra45, viscosity 3.7 mPa·s)

[0211] Silicone oil

[0212] KF-96A-1cs: Trisiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KF-96A-1cs, boiling point 153℃, Ra45, viscosity 0.9 mPa·s)

[0213] TMF-1.5: Methyl polytrimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: TMF-1.5, boiling point 191℃, Ra45, 1.4 mPa·s)

[0214] Synthesis Example 1 (Synthesis of Cationic Polymer 1)

[0215] The monomers with the composition shown in the "Initial Monomer Solution" column of Table 1 are placed in a reaction vessel equipped with two dropping funnels 1 and 2, and nitrogen substitution is carried out.

[0216] On the other hand, a monomer solution was prepared by mixing the monomers and organic solvents shown in the "Monomer Solution" column of Table 1. In addition, a polymerization initiator solution was prepared by mixing the organic solvents and polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile): manufactured by Fujifilm and Kojun Pharmaceutical Co., Ltd., trade name: V-65) shown in the "Polymerization Initiator Solution" column of Table 1. The solutions were placed in dropping funnels 1 and 2 respectively and nitrogen substitution was performed.

[0217] Under a nitrogen atmosphere, the initial monomer solution in the reaction vessel is stirred and maintained at 62°C. The monomer solution and polymerization initiator solution are slowly added dropwise into the reaction vessel over 2 hours, with the ratio of the added polymerization initiator to the added monomer being fixed.

[0218] After the addition was complete, the temperature was maintained at 62°C, and the mixture was stirred for 1 hour. Then, 47 parts of acetone were added. The mixture was stirred further while maintaining the temperature at 62°C for 4 hours to mature.

[0219] Next, an ultrafiltration membrane (manufactured by Nippon Insulator Co., Ltd., ceramic ultrafiltration membrane, trade name: Cefilt, pore size 10 nm) was used to remove unreacted monomers and polymerization initiator residues from the reactants, followed by drying to obtain a cationic amphiphilic polymer (hereinafter also referred to as "cationic polymer 1"). The obtained cationic polymer 1 has a weight-average molecular weight of 130,000.

[0220] Synthesis Example 2 (Synthesis of Cationic Polymer 2)

[0221] The monomers with the composition shown in the "Initial Monomer Solution" column of Table 1 are placed in a reaction vessel equipped with two dropping funnels 1 and 2, and nitrogen substitution is carried out.

[0222] On the other hand, a monomer solution is prepared by mixing the monomers and organic solvents shown in the "Monomer Solution" column of Table 1. In addition, a polymerization initiator solution is prepared by mixing the polymerization initiator (V-65) shown in the "Polymerization Initiator Solution" column of Table 1. The solutions are placed in dropping funnels 1 and 2 respectively and nitrogen substitution is performed.

[0223] Under a nitrogen atmosphere, the initial monomer solution in the reaction vessel is stirred and maintained at 55°C. The monomer solution and polymerization initiator solution are slowly added dropwise into the reaction vessel over 2 hours, with the ratio of the added polymerization initiator to the added monomer being fixed.

[0224] After the addition is complete, stir while maintaining the temperature at 55°C for 5 hours to mature.

[0225] Next, an ultrafiltration membrane (manufactured by Nippon Insulator Co., Ltd., ceramic ultrafiltration membrane, trade name: Cefilt, pore size 10 nm) was used to remove unreacted monomers and polymerization initiator residues from the reactants, followed by drying to obtain a cationic amphiphilic polymer (hereinafter also referred to as "cationic polymer 2"). The obtained cationic polymer 2 has a weight-average molecular weight of 120,000.

[0226] [Table 1]

[0227]

[0228] *1: N-[3-(dimethylamino)propyl]acrylamide, manufactured by Sigma-Aldrich.

[0229] *2: N-tert-butylacrylamide, manufactured by Sigma-Aldrich

[0230] *3: Methoxylated polyethylene glycol monomethacrylate, manufactured by Shin-Chung Chemical Co., Ltd., trade name: NK ESTER M-90G (average molar addition of ethylene oxide = 9, terminal: methyl)

[0231] *4: 2,2'-Azobis(2,4-dimethylvaleronitrile), manufactured by Fujifilm and Koujun Pharmaceutical Co., Ltd., trade name V-65. Synthesis Example 3 (Synthesis of cationic organosilicon polymer 1).

[0232] 12.9 g (0.13 mol) of 2-ethyl-2-oxazoline and 27.7 g of ethyl acetate were mixed, and the mixture was dehydrated using 2.0 g of a molecular sieve (Zeoram A-4, manufactured by Tosoh Corporation) at 28 °C for 15 hours. 0.77 g (0.005 mol) of diethyl sulfate was added to the resulting dehydrated ethyl acetate solution of 2-ethyl-2-oxazoline, and the mixture was heated under reflux at 80 °C for 8 hours under a nitrogen atmosphere to obtain a terminally reactive poly(N-propionylethyleneimine) solution (number average molecular weight 2,700).

[0233] In addition, 100.0 g of side-chain primary aminopropyl modified polydimethylsiloxane (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name: KF-8015, weight average molecular weight 100,000 (catalog value), amine equivalent 20,000) and 203.0 g of ethyl acetate were mixed, and the mixture was dehydrated using 15.2 g of molecular sieve at 28°C for 15 hours.

[0234] Next, the terminally reactive poly(N-propionyl ethyleneimine) solution obtained above was added in one step to the dehydrated side-chain primary aminopropyl modified polydimethylsiloxane solution, and the mixture was heated under reflux at 80°C for 10 hours. The resulting reaction mixture was concentrated under reduced pressure to obtain a white rubbery solid (108 g) of poly(N-propionyl ethyleneimine) / dimethylpolysiloxane copolymer (hereinafter also referred to as "cationic organosilicon polymer 1"). The cationic organosilicon polymer 1 has a weight-average molecular weight of 115,000 (calculated value) and a mass ratio [content of organopolysiloxane segment (x) / [total content of organopolysiloxane segment (x) and poly(N-acyl alkylimine) segment (y)] of 0.87.

[0235] Synthesis Example 4 (Synthesis of Cationic Organosilicon Polymer 2)

[0236] 53.3 g (0.54 mol) of 2-ethyl-2-oxazoline and 127.5 g of ethyl acetate were mixed, and the mixture was dehydrated using 9.0 g of molecular sieve (Zeoram A-4, manufactured by Tosoh Corporation) for 15 hours. 9.48 g (0.061 mol) of diethyl sulfate was added to the resulting dehydrated ethyl acetate solution of 2-ethyl-2-oxazoline, and the mixture was heated under nitrogen atmosphere at 80 °C for 8 hours under reflux to obtain a terminally reactive poly(N-propionylethyleneimine) solution (number average molecular weight 1,300).

[0237] In addition, 153.7 g of side-chain primary aminopropyl modified polydimethylsiloxane (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name: KF-8003, weight average molecular weight 40,000 (catalog value), amine equivalent 2,000) and 312.1 g of ethyl acetate were mixed, and the mixture was dehydrated using 23.3 g of molecular sieve at 28°C for 15 hours.

[0238] Next, the terminally reactive poly(N-propionyl ethyleneimine) solution obtained above was added in one step to the dehydrated side-chain primary aminopropyl modified polydimethylsiloxane solution, and the mixture was heated under reflux at 80°C for 10 hours. The reaction mixture was concentrated under reduced pressure to obtain a pale yellow rubbery solid (200 g) of poly(N-propionyl ethyleneimine) / dimethylpolysiloxane copolymer (hereinafter also referred to as "cationic organosilicon polymer 2"). The cationic organosilicon polymer 2 has a weight-average molecular weight of 56,000 (calculated value) and a mass ratio [content of organopolysiloxane segment (x) / [total content of organopolysiloxane segment (x) and poly(N-acyl alkylimine) segment (y)] of 0.71.

[0239] Synthesis Example 5 (Synthesis of Cationic Organosilicon Polymer 3)

[0240] 73.7 g (0.74 mol) of 2-ethyl-2-oxazoline and 156.0 g of ethyl acetate were mixed, and the resulting mixture was dehydrated using 12.0 g of a molecular sieve (Zeoram A-4, manufactured by Tosoh Corporation) at 28 °C for 15 hours. 2.16 g (0.014 mol) of diethyl sulfate was added to the resulting dehydrated ethyl acetate solution of 2-ethyl-2-oxazoline, and the mixture was heated under reflux at 80 °C for 8 hours under a nitrogen atmosphere to obtain a terminally reactive poly(N-propionylethyleneimine) solution (number average molecular weight 6,000).

[0241] In addition, 70.0 g of side-chain primary aminopropyl modified polydimethylsiloxane (KF-864, manufactured by Shin-Etsu Silicon Co., Ltd., weight average molecular weight 50,000 (catalog value), amine equivalent 3,800) and 140.0 g of ethyl acetate were mixed, and the mixture was dehydrated at 28°C for 15 hours using 15.0 g of molecular sieve.

[0242] Next, the terminally reactive poly(N-propionyl ethyleneimine) solution obtained above was added in one step to the above-mentioned dehydrated side-chain primary aminopropyl modified polydimethylsiloxane solution, and the mixture was heated under reflux at 80°C for 10 hours. The reaction mixture was concentrated under reduced pressure to obtain a white rubbery solid (135 g) of poly(N-propionyl ethyleneimine) / dimethylpolysiloxane copolymer (hereinafter also referred to as "cationic organosilicon polymer 3"). The cationic organosilicon polymer 3 has a weight-average molecular weight of 100,000 (calculated value) and a mass ratio [content of organopolysiloxane segment (x) / [total content of organopolysiloxane segment (x) and poly(N-acyl alkylimine) segment (y)] of 0.50.

[0243] Examples 1-1 to 1-5 and Comparative Examples 1-1 to 1-7

[0244] (Manufacturing of cosmetic compositions)

[0245] Three parts of Ultra Hold 8 and three parts of YUKAFORMER SM-dry, which are polymer C, were dissolved in solvent A as described in Table 2. After confirming that the solution was transparent and free of floating matter and precipitate, solvent B as described in Table 2 was added and the solution was stirred to homogenize it. The solution was then filtered using a cellulose acetate syringe filter made by Advantech with a pore size of 0.20 μm or a PTFE syringe filter made by the same company to obtain cosmetic compositions X-1 to X-5 and XC-1 to XC-7.

[0246] Regarding the filters used, from the viewpoint of the solvent resistance of the filters themselves, cellulose acetate syringe filters manufactured by Advantech are used for liquid compositions X-1 to X-5 and XC-1 to XC-2 and XC-7, and PTFE syringe filters manufactured by Advantech are used for liquid compositions XC-3 to XC-6.

[0247] In Example 1-1, the polymer C used dissolved in 100g of solvent A with a concentration of 50g and in 100g of solvent B with a concentration of 0.3g. In Examples 1-2 to 1-5, the polymer C used dissolved in 100g of solvent B with a concentration of less than 5g and in 100g of solvent A with a concentration of more than 5g.

[0248] (Making a cosmetic film)

[0249] In an indoor environment where temperature and humidity were controlled at 25°C and 50%, a glass substrate (Matsunami Glass Industry Co., Ltd., MAS-coated glass slide S9215) was fixed with the MAS coating side facing up on a benchtop coating machine (Mitsui Electric Machinery Co., Ltd., TC-1). After 1 ml of each cosmetic composition was dropped onto the end of the glass slide, each cosmetic composition was immediately coated on the glass substrate using a No. 16 wire rod at a moving speed of 1 m per minute, so that the thickness of the coating film before drying was 36.6 μm. During coating, an ultrasonic sprayer (manufactured by Shinsei Industrial Co., Ltd., trade name: COMFORT OASIS, model: KU-200, average droplet size: 1-5 μm) is used to spray tiny droplets of ion-exchanged water onto the coating surface while simultaneously following the coating bar. The ultrasonic sprayer is switched off when the bar falls off the glass substrate, stopping the spraying of droplets.

[0250] Glass substrates coated with cosmetic compositions and sprayed with droplets of ion-exchanged water were placed in an indoor environment with temperature and humidity controlled at 25°C and 50% for 30 minutes to obtain cosmetic films 1-1 to 1-5 and 1-C1 to 1-C7 formed by the respective cosmetic compositions.

[0251] (Whiteness rating)

[0252] According to JIS K5101-4:2004, one cosmetic coating film formed on a glass substrate was placed on the black portion of the opacity test paper, and the image density of black was measured. A spectrophotometer / density meter (manufactured by X-Rite Co., Ltd., trade name: SpectroEye) was used to measure the image density. The measurement conditions were set as follows: light source D65, viewing field 2 degrees, density reference DIN, white substrate "Abs", and built-in filter "No". The results are shown in Table 2.

[0253] Measurements were performed on an uncoated glass substrate, and the result was a value of 2.25. A lower value indicates higher whiteness and better opacity. A value of 1 or less is preferred, as this provides exceptionally high whiteness and excellent opacity.

[0254] [Table 2]

[0255]

[0256] As shown in Table 2, Examples 1-1 to 1-5 exhibit high whiteness and high opacity despite not containing inorganic pigments. On the other hand, Comparative Examples 1-1 to 1-7 exhibit low whiteness and therefore high transparency, failing to show the desired opacity.

[0257] Examples 2-1 to 2-30

[0258] (Manufacturing of cosmetic compositions)

[0259] Polymer C, as shown in Tables 3 and 4, was dissolved in anhydrous ethanol as solvent A. After confirming that the solution was transparent and free of floating matter and precipitate, PARLEAM3 as solvent B was added and the mixture was stirred to homogenize it. The solution was then filtered using a cellulose acetate syringe filter manufactured by Advantech with a pore size of 0.20 μm to obtain cosmetic compositions Y-1 to Y-30.

[0260] The polymer C used in Examples 2-1 to 2-30 has a solubility of less than 5g in 100g of solvent B and a solubility of more than 5g in 100g of solvent A.

[0261] (Makeup of cosmetic film and evaluation of whiteness)

[0262] Cosmetic films 2-1 to 2-30 were prepared in the same manner as described above, and their whiteness was evaluated. The results are shown in Tables 3 and 4.

[0263] [Table 3]

[0264]

[0265] [Table 4]

[0266]

[0267] As shown in Table 3, for Examples 2-1 to 2-6, when using only one polymer C, compared with the use of anionic polymer CI and cationic polymer CII-1, the whiteness is higher and the hiding power is better when using betaine polymer CIII.

[0268] Furthermore, as shown in Tables 3 and 4, for Examples 2-7 to 2-27, regarding the anionic polymer CI and the cationic polymer CII-1, compared to using them alone, when used in combination with the cationic organosilicon polymer CII-2, the whiteness is higher, exhibiting superior hiding power. Furthermore, for the betaine polymer CIII, compared to using it alone, when used in combination with either the anionic polymer CI or the cationic polymer CII-1, the whiteness is higher, exhibiting superior hiding power.

[0269] As shown in Table 4, in Examples 2-28, three types of polymers were used: betaine polymer CIII, anionic polymer CI, and cationic organosilicon polymer CII-2. However, compared with the cases where anionic polymer CI and cationic organosilicon polymer CII-2 were used alone, the whiteness was higher, showing better opacity.

[0270] On the other hand, as shown in Table 4, although the whiteness was poor in Examples 2-29 and 2-30, which used nonionic polymers, the whiteness was poor compared to the case where ionic polymers were used, but the opacity was more adequate in practical use.

[0271] Examples 3-1 to 3-10

[0272] (Manufacturing of cosmetic compositions)

[0273] Polymer C, as described in Table 5, was dissolved in anhydrous ethanol, which was used as solvent A. After confirming that the solution was transparent and free of floating matter and precipitate, solvent B, as described in Table 5, was added and stirred to homogenize the solution. The solution was then filtered using a cellulose acetate syringe filter manufactured by Advantech with a pore size of 0.20 μm to obtain cosmetic compositions Z-1 to Z-10.

[0274] The polymer C used in Examples 3-1 to 3-10 has a solubility of less than 5g in 100g of solvent B and a solubility of more than 5g in 100g of solvent A.

[0275] (Makeup application, speed of whiteness development, and evaluation of whiteness)

[0276] Cosmetic films 3-1 to 3-10 were prepared in the same manner as above, and their whiteness was evaluated.

[0277] In the evaluation of whiteness, whiteness was measured every 5 minutes after coating. The time required for the whiteness value to stabilize was recorded to evaluate the whiteness development speed. When measuring whiteness, the moment when the difference between the whiteness measured 5 minutes prior and the value becomes less than 0.1 was defined as the moment of whiteness stabilization. This time was recorded, and the whiteness at this point was evaluated. The results are shown in Table 5.

[0278] The shorter the time to whiteness stabilization, the better. If it is within 30 minutes, the whiteness development speed is not a problem in practical terms.

[0279] [Table 5]

[0280]

[0281] As shown in Table 5, Examples 3-1 to 3-10 quickly exhibit high whiteness and high opacity even without inorganic pigments.

[0282] [Industrial Applicability]

[0283] The cosmetic composition of the present invention can produce a skin-covering cosmetic film with excellent coverage even without the use of inorganic pigments.

Claims

1. A cosmetic composition for skin use, wherein, Contains solvent A, solvent B and polymer C. The boiling point of solvent A is below 99°C, and the distance Ra of solvent A relative to water, as expressed by the Hansen solubility parameter in equation (1) below, is less than 36. The solvent B has a boiling point of 150°C or higher, and the distance Ra of the solvent B relative to the Hansen solubility parameter of water as expressed by the following formula (1) is 40 or higher. Solvent B is miscible with solvent A, and polymer C is soluble in solvent A but insoluble in solvent B. Solvent A is selected from at least one of ethanol, propanol, isopropanol, and tert-butanol. Solvent B is selected from at least one of hydrogenated polyisobutylene with a viscosity of 0.5 mPa·s or higher and 30 mPa·s or lower at 20°C and silicone oil with a viscosity of 0.5 mPa·s or higher and 20 mPa·s or lower at 25°C. Solvent A has a content of 50% by mass or more and 90% by mass or less, and solvent B has a content of 5% by mass or more and 40% by mass or less. Polymer C includes: anionic polymer CI containing structural units derived from monomers having acidic groups, and cationic organosilicon polymer CII-2. The combined content of the anionic polymer CI and the cationic organosilicon polymer CII-2 in polymer C is more than 60% by mass and less than 100% by mass. The mass ratio of polymer C content to the total content of solvents A and B is such that polymer C / (solvent A + solvent B) = 0.01 or higher and less than 1. The content of polymer C is 2% by mass or more and 15% by mass or less. The cationic organosilicon polymer CII-2 is a poly(N-acylalkyleneimide) / organopolysiloxane copolymer comprising organopolysiloxane segments (x) and poly(N-acylalkyleneimide) segments (y), wherein the segment (y) is composed of an alkylene group containing a cationic nitrogen atom bonded to the segment (x) and a repeating unit of the N-acylalkyleneimide represented by the following general formula (1-1). In the formula, R 1 This indicates an alkyl group with 1 or more but less than 22 carbon atoms, an aryl group with 6 or more but less than 22 carbon atoms, or an aralkyl group or alkylaryl group with 7 or more but less than 22 carbon atoms, where a is 2 or 3. The mass ratio of segment (x) content to the total content of segment (x) and segment (y) in the poly(N-acylalkylimide) / organopolysiloxane copolymer is such that the content of segment (x) / [total content of segment (x) and segment (y)] is 0.1 or more and 0.99 or less. The poly(N-acylalkylimide) / organopolysiloxane copolymer has a weight-average molecular weight of 10,000 or more and 1,000,000 or less. In the alkylene group containing at least one cationic nitrogen atom bonded to segment (x), the nitrogen atom present between carbon-carbons or at the end of the alkylene chain is selected from (i) secondary or tertiary amines, (ii) ammonium salts with hydrogen ions added to secondary or tertiary amines, and (iii) quaternary ammonium salts. Ra=(4×ΔD 2 +ΔP 2 +ΔH 2 ) 0.5 (1) ΔD: The difference between the solvent and water in the dispersive component of Hansen's solubility parameter. ΔP: The difference between the solvent and water in the dipole component of Hansen's solubility parameter. ΔH: The difference between the hydrogen-bonding component of the solvent and water in the Hansen solubility parameter.

2. The cosmetic composition for skin use according to claim 1, wherein, The silicone oil is selected from one or more of linear silicone oil, branched silicone oil, and cyclic silicone oil.

3. The cosmetic composition for skin use according to claim 1, wherein, The silicone oil is selected from one or more of trisiloxane and methyl polytrimethylsiloxane.

4. The cosmetic composition for skin use according to any one of claims 1 to 3, wherein, The mass ratio of polymer C content to the total content of solvent A and solvent B is such that polymer C / (solvent A + solvent B) = 0.03 or more and 1 or less.

5. The cosmetic composition for skin according to any one of claims 1 to 3, wherein, The mass ratio of solvent A to solvent B is such that solvent A / solvent B = 0.1 or more and 50 or less.

6. The cosmetic composition for skin use according to any one of claims 1 to 3, wherein, Monomers with acidic groups are monomers with carboxyl groups.

7. The cosmetic composition for skin use according to any one of claims 1 to 3, wherein, The monomer having an acidic group is selected from at least one of (meth)acrylic acid, butenoic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid and 2-methacryloyloxymethylsuccinic acid.

8. The cosmetic composition for skin according to any one of claims 1 to 3, wherein, Anionic polymers CI are copolymers containing structural units derived from monomers having acidic groups and structural units derived from monomers other than monomers having acidic groups.

9. The cosmetic composition for skin use according to claim 8, wherein, Other monomers besides those with acidic groups are selected from one or more of the following: (meth)acrylates having a hydrocarbon group derived from aliphatic alcohols, monomers containing aromatic groups, and nonionic monomers.

10. The cosmetic composition for skin use according to claim 9, wherein, (Meth)acrylates having a hydrocarbon group derived from an aliphatic alcohol are (meth)acrylates having a hydrocarbon group derived from an aliphatic alcohol having 1 or more and 22 or fewer carbon atoms.

11. The cosmetic composition for skin use according to claim 9, wherein, A monomer containing an aromatic group is a vinyl monomer having an aromatic group having 6 or more but less than 22 carbon atoms.

12. The cosmetic composition for skin use according to claim 9, wherein, The nonionic monomer is selected from one or more of (meth)acrylamide, N-vinyl-2-pyrrolidone, diacetone acrylamide, N-alkyl (meth)acrylamide, hydroxyalkyl (meth)acrylate, and polyalkylene glycol (meth)acrylate.

13. The cosmetic composition for skin use according to any one of claims 1 to 3, wherein, The anionic polymer CI is a copolymer of (meth)acrylic acid / (meth)acrylic acid alkyl ester / (N-alkyl)(meth)acrylamide.

14. The cosmetic composition for skin according to any one of claims 1 to 3, wherein, The content of inorganic pigments in the skin cosmetic composition is less than 10% by mass.

15. The cosmetic composition for skin according to any one of claims 1 to 3, wherein, The viscosity of the skin cosmetic composition at 20°C is 1 mPa·s or more and 300 mPa·s or less.

16. A cosmetic film for skin, formed from any one of the cosmetic compositions for skin according to claims 1 to 15.

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