Skin cosmetic composition

Abstract

To provide a skin cosmetic composition enabling formation of a film that exhibits vapor barrier performance under low-humidity conditions and exhibits vapor release performance under high-humidity conditions, while the skin cosmetic composition demonstrating superior usability.SOLUTION: A skin cosmetic composition comprises: (A) one or more selected from the group consisting of anionic polymers and nonionic polymers, having a viscosity of 5,000 mPa s or more at 25°C in a 2 mass% aqueous solution; (B) one or more selected from the group consisting of water-swelling clay minerals and water-swelling mica; (C) a polyhydric alcohol; and water. The content of component (A) in the skin cosmetic composition is more than 0.2 mass% and less than 3.0 mass%. The content of component (B) is more than 0.1 mass% and less than 3.0 mass%.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Leave-on type skin cosmetics such as emulsions, creams, lotions, sunscreens, or compositions that can be used in such cosmetics are known (see Patent Documents 1 to 3). Patent Document 1 discloses that a self-foaming and / or foamy cosmetic or skin preparation comprising a predetermined emulsifier system, a lipid phase, a gas, a gel-forming agent, organic hydrocolloids, and an oil-absorbing solid substance can foam as quickly as possible during formulation and yet has a sufficiently high stability to be packaged, stored, and sold by ordinary methods. Patent Document 2 describes that a cosmetic composition substantially free of fatty acids and soaps, containing a C 12 ~C 22 fatty alcohol, an emulsifier, an inorganic agent containing smectite clay, a polymer, and water in predetermined amounts can provide the sensory characteristics of a vanishing cream. Patent Document 3 discloses that a topical skin preparation characterized by containing a polyoxyalkylene glyceryl ether, a water-swellable clay mineral, and an alkylene glycol alginate ester has no sticky feeling and exhibits a sufficient moisturizing effect on the skin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, it is known that skin damage is caused by severe humidity changes. For example, in a low humidity environment, problems due to dryness occur, and in a high humidity environment, the stratum corneum becomes congested and over-hydrated, making the skin vulnerable to irritants. The stratum corneum of the skin adjusts the amount of moisture evaporation or absorption from the skin surface in response to the surrounding environment and functions to protect the skin. However, in daily life, the human skin is repeatedly exposed to severe humidity changes due to moving from an air-conditioned indoor environment to the outdoors, etc., so there is a concern that the function of the stratum corneum cannot respond sufficiently to humidity changes and damage accumulates on the skin.

[0005] Therefore, there is a demand for a cosmetic technology that can adjust the amount of moisture on the skin surface in response to the surrounding environment like the stratum corneum and can suppress skin damage in both low humidity and high humidity environments. Specifically, it is considered that the above object can be achieved by a skin cosmetic that exhibits water vapor barrier properties in a low humidity environment to enhance skin moisturization and forms a coating film that exhibits water vapor release properties in a high humidity environment without hindering the release of water vapor from the stratum corneum. In the cosmetic field, a technique for forming a hydrophobic film is also known. Although this technique can impart water vapor barrier properties to the skin, it does not exhibit environmental responsiveness that can adjust the water vapor barrier properties according to humidity.

[0006] Furthermore, as a skin cosmetic composition, it is also important that the feel of use is good.

[0007] The present invention relates to a skin cosmetic composition that can form a coating film that exhibits water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment, and is also excellent in the feel of use.

Means for Solving the Problems

[0008] The inventors have found that the above problems can be solved by a skin cosmetic composition containing at least one selected from the group consisting of a predetermined anionic or nonionic polymer, a water-swellable clay mineral, and a water-swellable mica, a polyhydric alcohol, and water. That is, the present invention relates to (A) at least one selected from the group consisting of anionic polymers and nonionic polymers having a viscosity of 5,000 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) at least one selected from the group consisting of water-swellable clay minerals and water-swellable mica, (C) a polyhydric alcohol, and a skin cosmetic composition containing water, a skin cosmetic composition in which the content of the component (A) in the skin cosmetic composition is more than 0.2% by mass and less than 3.0% by mass, and the content of the component (B) is more than 0.1% by mass and less than 3.0% by mass. [Advantages of the Invention]

[0009] According to the present invention, it is possible to form a coating film that exhibits water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment, and further provide a skin cosmetic composition having excellent usability. [Modes for Carrying Out the Invention]

[0010] [Definitions] In this specification, "containing component X" also includes blending component X. In this specification, the water vapor barrier property in a low humidity environment is based on the water vapor barrier property at a relative humidity of 40%, and the water vapor barrier property in a high humidity environment is based on the water vapor barrier property at a relative humidity of 80%. In the present invention, when the water vapor barrier property at a relative humidity of 40% is high, it can be regarded as "exhibiting a high water vapor barrier property in a low humidity environment". In the following description, the property of exhibiting water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment may be referred to as "environmental responsiveness". In this specification, it can be considered that the higher the difference between the water vapor barrier property at a relative humidity of 40% and the water vapor barrier property at a relative humidity of 80%, the higher the environmental responsiveness. Specifically, the environmental responsiveness can be evaluated by the method described in the examples.

[0011] In this specification, the "feel of use" of a skin cosmetic composition means that the smooth and moist feeling after applying the skin cosmetic composition to the skin, the feeling of the skin being protected, and the good spreadability during application are all excellent. Specifically, the feel of use of the skin cosmetic composition can be evaluated by the method described in the examples.

[0012] [Skin cosmetic composition] The skin cosmetic composition of the present invention (hereinafter, also simply referred to as "(the composition of the present invention)") is a skin cosmetic composition containing (A) one or more selected from the group consisting of an anionic polymer and a nonionic polymer having a viscosity of 5,000 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) one or more selected from the group consisting of a water-swellable clay mineral and a water-swellable mica, (C) a polyhydric alcohol, and water, wherein the content of the component (A) in the skin cosmetic composition is more than 0.2% by mass and less than 3.0% by mass, and the content of the component (B) is more than 0.1% by mass and less than 3.0% by mass. By having the above configuration, the composition of the present invention can form a coating film that exhibits water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment, and is also excellent in the feel of use.

[0013] The reason why the composition of the present invention exhibits the above effects is not clear, but it is considered as follows. Since the polymer as the component (A) is a hydrophilic hydrogel, its properties change triggered by moisture absorption, and a coating film capable of exhibiting environmental responsiveness can be formed. However, when the polymer is used alone, there is a limit to the improvement of the water vapor barrier property in a low humidity environment. Component (B) is a plate-like mineral. When a predetermined amount of component (B) is added to component (A) to form a coating film, in the coating film, the plate-like surfaces of component (B) are dispersed so as to be substantially parallel to the coating film surface. And when water vapor permeates in the thickness direction of the coating film, it is considered that the so-called "labyrinth effect" is exhibited, that is, the presence of component (B) makes the permeation path of water vapor longer. It is considered that the improvement effect of water vapor barrier property can be obtained by this labyrinth effect. On the other hand, if component (B) aggregates in the coating film, sufficient water vapor barrier property due to the labyrinth effect cannot be obtained. However, since component (A) is anionic or nonionic, unlike a cationic polymer, it is considered that aggregation hardly occurs even when it interacts with negatively charged component (B). Furthermore, since component (B) is water-swellable, it has a high affinity for an aqueous composition containing component (C) and water, and it is considered that it hardly aggregates in the formed coating film. Also, if the viscosity of a 2 mass% aqueous solution of component (A) at 25 °C is a predetermined value or more, it is considered that defects hardly occur in the labyrinth structure in the formed coating film, and the water vapor barrier property can be further improved. Furthermore, since both component (A) and component (B) are hydrophilic, the coating film containing component (A) and component (B) is sensitive to the surrounding humidity and absorbs moisture and swells in a high humidity environment. Therefore, in a high humidity environment, as the coating film swells, the dispersion state of component (B) in component (A) changes, defects occur in the labyrinth structure in the coating film, and the water vapor barrier property is not exhibited, and it is considered that the water vapor release property changes.

[0014] The composition of the present invention contains component (C), thereby improving the usability. Also, since component (C) has hygroscopicity, it is considered that the environmental responsiveness due to humidity changes is further improved. Furthermore, in the composition of the present invention, by using a predetermined amount of component (A) and component (B), it is considered that the deterioration of the usability can be suppressed while improving the water vapor barrier property and the environmental responsiveness.

[0015] <Component (A): Anionic polymer or nonionic polymer> Component (A) is at least one selected from the group consisting of anionic polymers and nonionic polymers, having a viscosity of 5,000 mPa·s or more at 25°C in a 2 mass% aqueous solution. As used herein, the term "anionic polymer" means a polymer having an anionic group and being negatively charged as a whole. The anionic group is an anionic group or a group that can be ionized to form an anionic group. Specifically, examples include at least one selected from the group consisting of acidic groups such as carboxy groups, sulfonic acid groups, sulfuric acid groups, and phosphoric acid groups. Preferably, it is at least one selected from carboxy groups, sulfonic acid groups, and sulfuric acid groups, and more preferably a sulfonic acid group or a sulfuric acid group. At least a part of the anionic group may be neutralized and in the form of a salt.

[0016] As used herein, the term "nonionic polymer" means a polymer that substantially does not have cationic groups, anionic groups, and amphoteric groups, which are ionic groups. "Substantially does not have ionic groups" means that the content of ionic groups in the polymer is 0.1 mol% or less.

[0017] The viscosity of a 2% by mass aqueous solution of component (A) at 25°C is 5,000 mPa·s or more, preferably 10,000 mPa·s or more, more preferably 30,000 mPa·s or more, still more preferably 50,000 mPa·s or more, even more preferably 70,000 mPa·s or more, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability. Also, it is preferably 200,000 mPa·s or less, more preferably 180,000 mPa·s or less, still more preferably 150,000 mPa·s or less, even more preferably 120,000 mPa·s or less, and even more preferably 100,000 mPa·s or less. And the viscosity of a 2% by mass aqueous solution of component (A) at 25°C is 5,000 mPa·s or more, preferably 5,000 mPa·s or more and 200,000 mPa·s or less, more preferably 10,000 mPa·s or more and 180,000 mPa·s or less, still more preferably 30,000 mPa·s or more and 150,000 mPa·s or less, even more preferably 50,000 mPa·s or more and 120,000 mPa·s or less, and even more preferably 70,000 mPa·s or more and 100,000 mPa·s or less. The viscosity of a 2% by mass aqueous solution of component (A) can be measured by the method described in the examples.

[0018] (Anionic polymer) The anionic polymer as component (A) preferably contains at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfuric acid group, (A2) an anionic polymer having a structural unit represented by the following general formula (1), and (A3) an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability. In this specification, “(meth)acrylic acid” means acrylic acid or methacrylic acid, and “(meth)acrylate” means acrylate or methacrylate. [Chemical formula] In formula (1), R 1 is a hydrogen atom or a methyl group, and M is a hydrogen atom, an alkali metal, or ammonium.

[0019] [Component (A1): An anionic polysaccharide having a sulfonic acid group or a sulfuric acid group] Examples of the anionic polysaccharide as component (A1) include natural polysaccharides and semi-synthetic polysaccharides derived from natural polysaccharides, and any of these can be used. Examples of the natural polysaccharide as component (A1) include carrageenan, chondroitin sulfate, keratan sulfate, dermatan sulfate, heparin, heparan sulfate, and salts thereof. The semi-synthetic polysaccharide as component (A1) is preferably a cellulose derivative or a starch derivative having a sulfonic acid group or a sulfuric acid group, more preferably a cellulose derivative having a sulfonic acid group or a sulfuric acid group, and still more preferably a cellulose derivative having a sulfonic acid group. Examples of the cellulose derivative having a sulfonic acid group include cellulose derivatives having a sulfonic acid group and a hydrophobic group having 8 to 24 carbon atoms, preferably 12 to 22 carbon atoms, more preferably 18 to 22 carbon atoms, and more preferably cellulose derivatives having a sulfonic acid group and an alkyl group having 8 to 24 carbon atoms, preferably 12 to 22 carbon atoms, more preferably 18 to 22 carbon atoms. Specific examples thereof include stearoxy PG hydroxyethylcellulose sulfonic acid or a salt thereof. Examples of the starch derivative having a sulfonic acid group or a sulfuric acid group include sulfated starch or a salt thereof. When component (A1) is a salt, examples of the salt include alkali metal salts such as sodium salt and potassium salt, ammonium salts, etc., and from the viewpoint of availability, an alkali metal salt is preferred.

[0020] Among these, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, improving the usability, and availability, component (A1) is preferably a semi-synthetic polysaccharide, more preferably a cellulose derivative having a sulfonic acid group or a sulfate group, still more preferably a cellulose derivative having a sulfonic acid group and a hydrophobic group having 8 to 24 carbon atoms, even more preferably a cellulose derivative having a sulfonic acid group and a hydrophobic group having 8 to 24 carbon atoms, even more preferably at least one selected from the group consisting of stearoxy PG hydroxyethyl cellulose sulfonic acid or a salt thereof, and even more preferably contains sodium stearoxy PG hydroxyethyl cellulose sulfonate.

[0021] [Component (A2): Anionic polymer having a structural unit represented by general formula (1)] Component (A2) is an anionic polymer having a structural unit represented by the following general formula (1). Note that component (A2) does not include component (A1). [Chemical formula] In formula (1), R 1 is a hydrogen atom or a methyl group, and M is a hydrogen atom, an alkali metal, or ammonium.

[0022] R in general formula (1) 1 is preferably a hydrogen atom from the viewpoint of availability, and M is preferably an alkali metal or ammonium, more preferably sodium or ammonium.

[0023] Component (A2) may be a polymer containing other structural units in addition to the structural unit represented by the general formula (1). Examples of the other structural units include structural units derived from vinyl pyrrolidone, (meth) acrylic acid or a salt thereof, (meth) acrylic acid alkyl ester, hydroxyalkyl (meth) acrylate such as 2-hydroxyethyl (meth) acrylate, acrylamides such as N,N-dimethylacrylamide, and the like. Component (A2) may also be a cross-polymer.

[0024] Specific examples of component (A2) include sodium polyacryloyldimethyltaurine, ammonium polyacryloyldimethyltaurine, (sodium acrylate / sodium acryloyldimethyltaurine) copolymer, (2-hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer, (ammonium acryloyldimethyltaurine / VP) copolymer, polyacrylate cross-polymer-6 (ammonium acryloyldimethyltaurine, dimethylacrylamide, lauryl methacrylate and laureth-4 methacrylate), (ammonium acryloyldimethyltaurine / beheneth-25 methacrylate) cross-polymer, etc. One or more of these can be used. Among the above, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, improving the usability, and the availability, preferably it contains one or more selected from the group consisting of (sodium acrylate / sodium acryloyldimethyltaurine) copolymer and (2-hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer.

[0025] [Component (A3): An anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid] Component (A3) is an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid, and is an anionic polymer having a carboxy group as an anionic group. At least a part of the carboxy group may be neutralized and in a salt state. Also, component (A3) does not contain component (A1) and component (A2). Examples of the anionic polymer having a structural unit derived from (meth)acrylic acid include a homopolymer of (meth)acrylic acid and a copolymer of (meth)acrylic acid and other monomers. Examples of the above homopolymer of (meth)acrylic acid include polyacrylic acid, polymethacrylic acid, and salts thereof. Examples of the above-mentioned (meth)acrylic acid copolymer include (meth)acrylic acid / maleic acid copolymer, (meth)acrylic acid / itaconic acid copolymer, (meth)acrylic acid / fumaric acid copolymer, (meth)acrylic acid / vinyl acetate copolymer, (meth)acrylic acid / (meth)acrylic acid alkyl ester copolymer, (meth)acrylic acid / 2-hydroxyethyl methacrylate copolymer, acrylic acid / acrylic acid alkyl ester / (N-alkyl)acrylamide copolymer, and salts thereof. One or more of these can be used. Among the above, as the copolymer of (meth)acrylic acid, (meth)acrylic acid / (meth)acrylic acid alkyl ester is preferred, and acrylic acid / acrylic acid alkyl ester is more preferred. As the (meth)acrylic acid alkyl ester, the alkyl preferably has 1 or more carbon atoms, more preferably 4 or more carbon atoms, still more preferably 8 or more carbon atoms, and preferably 40 or less carbon atoms, more preferably 36 or less carbon atoms, still more preferably 32 or less carbon atoms. Examples of the (meth)acrylic acid alkyl ester include those having such carbon numbers.

[0026] Specific examples of component (A3) include carboxyvinyl polymer or its salt, (acrylates / acrylic acid alkyl (C10-30)) cross-polymer, acrylate cross-polymer-4, (acrylates / stearyl methacrylate-20) copolymer, and the like. Among the above, from the viewpoints of improving the water vapor barrier property in a low-humidity environment, improving the environmental responsiveness, improving the usability, and the availability, it preferably contains (acrylates / acrylic acid alkyl (C10-30)) cross-polymer.

[0027] As the anionic polymer of component (A), commercially available anionic polymers can also be used. Specific examples thereof include "SPS-S-SA" (sodium stearoxy PG hydroxyethyl cellulose sulfonate) manufactured by Kao Corporation, "Simulgel EG QD" ((sodium acrylate / sodium acryloyldimethyltaurate) copolymer), "SEPINOV EMT10", "Sepiplus S", "Simulgel FL", "Simulgel NS" (the above are (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymers), "Sepimax zen" (polyacrylate crosspolymer-6), "Aristoflex AVC" ((ammonium acryloyldimethyltaurate / VP) copolymer) manufactured by Clariant Japan Co., Ltd., "Aristoflex HMB" ((ammonium acryloyldimethyltaurate / behenyl methacrylate-25) crosspolymer), "ACULYN 22" ((acrylates / stearyl methacrylate-20) copolymer) manufactured by The Dow Chemical Company Japan Ltd., "PEMULEN TR-1 POLYMER" ((acrylates / alkyl acrylate (C10-30)) crosspolymer) manufactured by Lubrizol Advanced Materials, etc.

[0028] From the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, improving the usability, and the availability, the anionic polymer of component (A) preferably contains one or more selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfuric acid group, and (A2) an anionic polymer having a structural unit represented by the general formula (1), and more preferably contains (A1) an anionic polysaccharide having a sulfonic acid group or a sulfuric acid group.

[0029] (Nonionic polymer) The nonionic polymer as component (A) preferably contains at least one selected from the group consisting of (A4) a nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth)acrylamide, (A5) a nonionic polymer containing a structural unit derived from (meth)acrylate, and (A6) a nonionic polysaccharide, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability.

[0030] [Component (A4): Nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth)acrylamide] Examples of the nonionic polymer (A4) containing a structural unit derived from N-substituted or unsubstituted (meth)acrylamide include a homopolymer of N-substituted or unsubstituted (meth)acrylamide, a copolymer of N-substituted (meth)acrylamide and N-unsubstituted (meth)acrylamide, and a copolymer of N-substituted or unsubstituted (meth)acrylamide and a nonionic monomer such as (meth)acrylate, vinyl pyrrolidone, vinyl acetate, vinyl methyl ether, etc. Examples of the N-substituted (meth)acrylamide include dialkyl (meth)acrylamides such as dimethyl (meth)acrylamide and diethyl (meth)acrylamide. Examples of the N-unsubstituted (meth)acrylamide include acrylamide and methacrylamide.

[0031] Examples of the (meth)acrylate include alkyl (meth)acrylate, hydroxyalkyl (meth)acrylate, alkyl ether (meth)acrylate, etc.

[0032] (A4) Specific examples of the nonionic polymer containing a structural unit derived from an N-substituted or unsubstituted (meth)acrylamide include polyacrylamide, polymethacrylamide, polydimethylacrylamide, poly diethylacrylamide, ((meth)acrylamide / dimethyl(meth)acrylamide) copolymer, (vinylpyrrolidone / (meth)acrylamide) copolymer, ((meth)acrylamide / alkyl acrylate) copolymer, (dimethylacrylamide / alkyl acrylate) copolymer, (dimethylacrylamide / hydroxyethyl acrylate / methoxyethyl acrylate) copolymer, and the like. Among these, component (A4) preferably contains one or more selected from the group consisting of polyacrylamide, polymethacrylamide, polydimethylacrylamide, poly diethylacrylamide, and ((meth)acrylamide / dimethyl(meth)acrylamide) copolymer, and more preferably contains polyacrylamide. As the nonionic polymer which is component (A4), commercially available nonionic polymers can also be used. Specific examples thereof include "SEPIGEL 305" (polyacrylamide) manufactured by SEPPIC.

[0033] [Component (A5): Nonionic polymer containing a structural unit derived from (meth)acrylate] (A5) Examples of the nonionic polymer containing a structural unit derived from (meth)acrylate include homopolymers of (meth)acrylate and copolymers of (meth)acrylate and nonionic monomers such as vinylpyrrolidone, vinyl acetate, and vinyl methyl ether. Examples of (meth)acrylate include alkyl (meth)acrylate, hydroxyalkyl (meth)acrylate, and alkyl ether (meth)acrylate. It should be noted that component (A4) is not included in component (A5). Specific examples of the nonionic polymer containing a structural unit derived from (meth)acrylate include (vinylpyrrolidone / alkyl acrylate) copolymer, (hydroxyethyl acrylate / methoxyethyl acrylate) copolymer, and the like.

[0034] [Component (A6): Nonionic polysaccharide] Examples of the nonionic polysaccharide (A6) include nonionic polysaccharides such as starch, cellulose, guar gum, tara gum, locust bean gum, and glucomannan, and derivatives thereof. Among these, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability, the nonionic polysaccharide preferably contains a derivative of a nonionic polysaccharide, more preferably contains a derivative of a nonionic polysaccharide having a substituent containing an alkyl group having 8 or more carbon atoms, and still more preferably contains a cellulose derivative having a substituent containing an alkyl group having 8 or more carbon atoms.

[0035] Examples of the substituent containing an alkyl group having 8 or more carbon atoms preferably include an alkyl group having 8 or more carbon atoms, a hydroxyalkyl group containing an alkyl group having 8 or more carbon atoms, or a hydroxyalkyl-alkyl ether group containing an alkyl group having 8 or more carbon atoms. Among these, preferably, it is one or more selected from the group consisting of an alkyl group having 8 or more carbon atoms and a hydroxyalkyl-alkyl ether group containing an alkyl group having 8 or more carbon atoms, and more preferably, it is a hydroxyalkyl-alkyl ether group containing an alkyl group having 8 or more carbon atoms.

[0036] The alkyl group having 8 or more carbon atoms is preferably an alkyl group having 8 to 22 carbon atoms, more preferably an alkyl group having 12 to 22 carbon atoms, still more preferably an alkyl group having 16 to 22 carbon atoms, and even more preferably an alkyl group having 18 to 22 carbon atoms. Specific examples of the alkyl group having 8 or more carbon atoms include, for example, linear or branched octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, myristyl group, pentadecyl group, palmityl group, heptadecyl group, stearyl group, isostearyl group, nonadecyl group, icosyl group, heneicosyl group, and behenyl group. Among these, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability, the alkyl group having 8 or more carbon atoms is preferably at least one selected from the group consisting of dodecyl group, tridecyl group, myristyl group, pentadecyl group, cetyl group, heptadecyl group, stearyl group, isostearyl group, nonadecyl group, icosyl group, henicosyl group, and behenyl group, more preferably at least one selected from the group consisting of cetyl group, stearyl group, isostearyl group, icosyl group, henicosyl group, and behenyl group, and still more preferably at least one selected from the group consisting of stearyl group and behenyl group.

[0037] In the derivative of the nonionic polysaccharide having a substituent containing an alkyl group having 8 or more carbon atoms, the parent nonionic polysaccharide into which the substituent containing an alkyl group having 8 or more carbon atoms is introduced may have a substituent containing a short-chain alkyl group having 3 or less carbon atoms. Specifically, it may be a compound in which one or more selected from the group consisting of an alkyl group, a hydroxyalkyl group, and a dihydroxyalkyl group having 3 or less carbon atoms are substituted on an unsubstituted nonionic polysaccharide. Further, the parent nonionic polysaccharide is preferably a compound having a cellulose skeleton. That is, the "unsubstituted nonionic polysaccharide" is preferably cellulose.

[0038] Examples of the compound having a cellulose skeleton, which is the parent nonionic polysaccharide, include alkylcellulose having only an alkyl group having 3 or less carbon atoms, hydroxyalkylcellulose having a hydroxyalkyl group or a dihydroxyalkyl group, and hydroxyalkyl-alkylcellulose having a hydroxyalkyl group or a dihydroxyalkyl group and an alkyl group having 3 or less carbon atoms.

[0039] Specific examples of the alkylcellulose having only an alkyl group having 3 or less carbon atoms include methylcellulose, ethylcellulose, propylcellulose, methyl ethylcellulose, methyl propylcellulose, ethyl propylcellulose, and the like. Specific examples of hydroxyalkyl cellulose having a hydroxyalkyl group or a dihydroxyalkyl group include hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, dihydroxypropyl hydroxyethyl cellulose, dihydroxypropyl hydroxypropyl cellulose, etc. One or more selected from the group consisting of hydroxyethyl cellulose, hydroxypropyl cellulose, and dihydroxypropyl hydroxyethyl cellulose are preferred. Specific examples of hydroxyalkyl-alkyl cellulose having a hydroxyalkyl group or a dihydroxyalkyl group and an alkyl group having 3 or less carbon atoms include hydroxymethyl-methyl cellulose, hydroxyethyl-methyl cellulose, hydroxymethyl-propyl cellulose, hydroxyethyl-methyl cellulose, hydroxyethyl-ethyl cellulose, hydroxyethyl-propyl cellulose, hydroxypropyl-methyl cellulose, hydroxypropyl-ethyl cellulose, hydroxypropyl-propyl cellulose, dihydroxypropyl hydroxyethyl-methyl cellulose, dihydroxypropyl hydroxypropyl-methyl cellulose, etc.

[0040] The cellulose derivative having a substituent containing an alkyl group having 8 or more carbon atoms is more preferably a compound in which a substituent containing an alkyl group having 8 or more carbon atoms is introduced into the cellulose having the hydroxyalkyl group or the dihydroxyalkyl group.

[0041] Specific examples of the compound in which a substituent containing an alkyl group having 8 or more carbon atoms is introduced into the cellulose having the hydroxyalkyl group or the dihydroxyalkyl group include cetyl hydroxyethyl cellulose (such as "Polysurf67CS" manufactured by Ashland), stearoxy PG hydroxyethyl cellulose (display name).

[0042] The nonionic polymer as component (A) preferably contains at least one selected from the group consisting of (A4) a nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth)acrylamide, and (A6) a nonionic polysaccharide, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, improving the usability, and availability, and more preferably contains (A6) a nonionic polysaccharide.

[0043] Component (A) preferably contains at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, (A2) an anionic polymer having a structural unit represented by the general formula (1), (A3) an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid, (A4) a nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth)acrylamide, (A5) a nonionic polymer containing a structural unit derived from (meth)acrylate, and (A6) a nonionic polysaccharide, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, improving the usability, and availability; more preferably contains at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, (A2) an anionic polymer having a structural unit represented by the general formula (1), (A4) a nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth)acrylamide, and (A6) a nonionic polysaccharide; and still more preferably contains at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, and (A6) a nonionic polysaccharide. Moreover, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, improving the usability, and availability, component (A) preferably contains at least one selected from the group consisting of sodium stearoxy PG hydroxyethyl cellulose sulfonate, (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer, polyacrylamide, and stearoxy PG hydroxyethyl cellulose, and more preferably contains at least one selected from the group consisting of sodium stearoxy PG hydroxyethyl cellulose sulfonate and stearoxy PG hydroxyethyl cellulose.

[0044] <Component (B): Water-swellable clay mineral or water-swellable mica> Component (B) is at least one selected from the group consisting of water-swellable clay minerals and water-swellable micas. The water-swellability referred to here means the property of swelling when dispersed in water. More specifically, it refers to those having a water swelling degree of 20 mL / 2 g or more determined by the following test method. (Test method) Put 100 mL of ion-exchanged water into a 100 mL graduated cylinder. Add 2 g of component (B) little by little in several portions so as not to stick to the wall surface of the graduated cylinder. After all of component (B) has naturally settled to the bottom of the graduated cylinder, read the volume (mL) of component (B) after 24 hours from the scale. The average value of three tests is taken as the water swelling degree (mL / 2 g) of component (B).

[0045] The water swelling degree of component (B) is preferably 25 mL / 2 g or more, more preferably 30 mL / 2 g or more, still more preferably 35 mL / 2 g or more, even more preferably 40 mL / 2 g or more, even more preferably 50 mL / 2 g or more, and even more preferably 60 mL / 2 g or more, from the viewpoints of suppressing aggregation of component (B), improving water vapor barrier properties in a low humidity environment, improving environmental responsiveness, and improving the feeling of use. The upper limit is not particularly limited, but is preferably 90 mL / 2 g or less, more preferably 85 mL / 2 g or less, and still more preferably 80 mL / 2 g or less. And the water swelling degree of component (B) is preferably 20 mL / 2 g or more and 90 mL / 2 g or less, more preferably 25 mL / 2 g or more and 90 mL / 2 g or less, still more preferably 30 mL / 2 g or more and 85 mL / 2 g or less, even more preferably 35 mL / 2 g or more and 85 mL / 2 g or less, even more preferably 40 mL / 2 g or more and 85 mL / 2 g or less, even more preferably 50 mL / 2 g or more and 80 mL / 2 g or less, and even more preferably 60 mL / 2 g or more and 80 mL / 2 g or less.

[0046] The aspect ratio of component (B) is preferably 40 or more, more preferably 70 or more, still more preferably 100 or more, even more preferably 150 or more, and even more preferably 200 or more, from the viewpoints of improving water vapor barrier properties in a low humidity environment, improving environmental responsiveness, and improving the feeling of use. The upper limit is not particularly limited, but is usually 2000 or less, preferably 1000 or less, more preferably 600 or less, still more preferably 500 or less, and even more preferably 400 or less. And the aspect ratio of component (B) is preferably 40 or more and 2000 or less, more preferably 70 or more and 1000 or less, still more preferably 100 or more and 600 or less, even more preferably 150 or more and 500 or less, and even more preferably 200 or more and 400 or less. The aspect ratio of component (B) can be measured according to the method described in Clay Science, Vol. 50, No. 3, pp. 162-174 (2012), specifically, the method described in the examples.

[0047] The average particle size of component (B) is preferably 100 nm or more, more preferably 200 nm or more, still more preferably 300 nm or more, and preferably 2000 nm or less, more preferably 1500 nm or less, still more preferably 1000 nm or less, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability. And the average particle size of component (B) is preferably 100 nm or more and 2000 nm or less, more preferably 200 nm or more and 1500 nm or less, still more preferably 300 nm or more and 1000 nm or less. The average particle size of component (B) can be measured by the dynamic light scattering method (DLS).

[0048] Component (B) is one or more selected from the group consisting of water-swellable clay minerals and mica. Hereinafter, clay minerals and mica may be collectively referred to as "minerals". The above water-swellable clay mineral has cations (Na + , K + , Mg 2+ , Ca 2+ , etc.) between its layers and swells by absorbing water. Specifically, smectite, bentonite, montmorillonite, beidellite, nontronite, saponite, stevensite, hectorite, etc. can be mentioned, and one or two or more of these can be used. Examples of smectite include magnesium aluminum silicate, sodium lithium magnesium silicate, etc. Water-swellable mica has cations (Na + , K + , Mg 2+ , Ca 2+ , etc.) between its layers among micas and swells by absorbing water. Specifically, sodium tetrasilicate mica, etc. can be mentioned.

[0049] Component (B) may be a mineral subjected to surface treatment, but from the viewpoint of water swelling property, it is preferably a mineral that has not been subjected to surface treatment or has been subjected to hydrophilic treatment, and more preferably a mineral that has not been subjected to surface treatment.

[0050] Component (B) preferably contains at least one selected from the group consisting of water-swellable smectite, water-swellable bentonite, water-swellable montmorillonite, water-swellable hectorite, and water-swellable mica from the viewpoints of improving water vapor barrier properties in a low humidity environment, improving environmental responsiveness, and improving usability. More preferably, it contains at least one selected from the group consisting of magnesium aluminum silicate, water-swellable bentonite, water-swellable hectorite, and sodium tetrasilicate mica. Even more preferably, it contains at least one selected from the group consisting of water-swellable bentonite and sodium tetrasilicate mica. Even more preferably, it contains water-swellable bentonite.

[0051] Commercially available products can also be used as Component (B). Specific examples thereof include "Kunipia G4" and "Kunipia F" manufactured by Kunimine Industries Co., Ltd. (both are purified bentonite (montmorillonite)), "Bengel HV" and "Bengel Next Nc" manufactured by Hoojun Co., Ltd. (both are bentonite), "Smeton-SA" and "Smeton-SWN" manufactured by Kunimine Industries Co., Ltd. (both are smectite), "NTS-5" (sodium tetrasilicate mica) manufactured by Toppan Industries Co., Ltd., etc.

[0052] <Component (C): Polyhydric Alcohol> The polyhydric alcohol as Component (C) contributes to improving the environmental responsiveness and usability of the skin cosmetic composition. The polyhydric alcohol is a compound having two or more hydroxy groups in the molecule, and any one can be used as long as it is used in ordinary cosmetics. It should be noted that Component (C) does not include those containing polyalkylene oxides such as polypropylene oxide and polyethylene oxide in the composition of the compound. Component (C) is preferably a low molecular weight polyhydric alcohol from the viewpoints of improving environmental responsiveness and usability. More preferably, it is a polyhydric alcohol having a molecular weight of 1,000 or less, even more preferably 800 or less, and even more preferably 500 or less.

[0053] As the component (C), one or more selected from the group consisting of (C1) an alcohol having three or more valences and (C2) a dihydric alcohol can be mentioned. Among these, from the viewpoint of improving the usability, it is preferable that the component (C) contains at least (C2) a dihydric alcohol, and from the viewpoints of improving the environmental responsiveness and the usability, it is more preferable to contain (C1) an alcohol having three or more valences and (C2) a dihydric alcohol.

[0054] (Component (C1): Alcohol having three or more valences) Component (C1) is an alcohol having three or more hydroxy groups in the molecule. Component (C1) has high hygroscopicity and contributes to the improvement of environmental responsiveness and usability. From the viewpoints of improving the environmental responsiveness and the usability, component (C1) is preferably an alcohol having 3 or more and 20 or less valences, and more preferably an alcohol having 3 or more and 12 or less valences. Also, the number of carbon atoms of component (C1) is preferably 3 or more and 24 or less, more preferably 3 or more and 18 or less, and still more preferably 3 or more and 12 or less from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability.

[0055] Component (C1) preferably contains one or more selected from the group consisting of trimethylolpropane, glycerin or its condensate, and sugar alcohol from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability. Examples of the trihydric alcohol include glycerin and trimethylolpropane. Examples of the tetrahydric alcohol include diglycerin and erythritol. Examples of the alcohol having 5 or more valences include polyglycerin such as polyglycerin-3 or polyglycerin-10; sugar alcohols such as glucose, maltose, maltitol, sucrose, xylitol, sorbitol, and maltitol. Component (C1) can use one or two or more of these. Among these, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability, component (C1) preferably contains one or more selected from the group consisting of glycerin, diglycerin, polyglycerin, and sugar alcohol, and more preferably contains one or more selected from the group consisting of glycerin, sorbitol, and maltitol.

[0056] (Component (C2): Dihydric alcohol) Component (C2) is an alcohol having two hydroxy groups in the molecule. Component (C2) also contributes to the improvement of usability and the improvement of antiseptic properties. From the viewpoints of improving the environmental responsiveness and improving the usability, the carbon number of component (C2) is preferably 2 or more and 12 or less, more preferably 3 or more and 12 or less, and still more preferably 3 or more and 8 or less. Also, from the viewpoints of improving the environmental responsiveness and improving the usability, component (C2) is preferably a chain alcohol, and more preferably a saturated chain alcohol.

[0057] Specific examples of component (C2) include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,3-propanediol, 1,3-butylene glycol, pentanediol, etc., and one or more of these can be used. Among these, from the viewpoints of improving the environmental responsiveness and improving the usability, component (C2) preferably contains one or more selected from the group consisting of dipropylene glycol and 1,3-butylene glycol.

[0058] Component (C) preferably contains at least one selected from the group consisting of glycerin, diglycerin, polyglycerin, sugar alcohol, dipropylene glycol, and 1,3-butylene glycol, from the viewpoints of improving environmental responsiveness and usability. More preferably, it contains at least one selected from the group consisting of glycerin, sorbitol, maltitol, dipropylene glycol, and 1,3-butylene glycol. Even more preferably, it contains (C1) at least one selected from the group consisting of glycerin, sorbitol, and maltitol and (C2) at least one selected from the group consisting of dipropylene glycol and 1,3-butylene glycol.

[0059] When component (C) contains component (C1), the content of component (C1) in component (C) is preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, still more preferably 40% by mass or more, and preferably 100% by mass or less, more preferably 90% by mass or less, even more preferably 80% by mass or less, still more preferably 70% by mass or less. When component (C) contains component (C2), the content of component (C2) in component (C) is preferably 10% by mass or more, more preferably 15% by mass or more, even more preferably 20% by mass or more, still more preferably 25% by mass or more, still more preferably 30% by mass or more, and 100% by mass or less.

[0060] When component (C) contains component (C1) and component (C2), the mass ratio [(C2) / (C1)] of component (C2) to component (C1) is preferably 0.1 or more, more preferably 0.2 or more, still more preferably 0.3 or more, even more preferably 0.5 or more, even more preferably 0.7 or more, and preferably 20 or less, more preferably 10 or less, still more preferably 5 or less, even more preferably 4 or less, even more preferably 2 or less, from the viewpoints of improving environmental responsiveness and usability. And the mass ratio [(C2) / (C1)] of component (C2) to component (C1) is preferably 0.1 or more and 20 or less, more preferably 0.2 or more and 10 or less, still more preferably 0.3 or more and 5 or less, even more preferably 0.5 or more and 4 or less, even more preferably 0.7 or more and 2 or less.

[0061] <Water> The skin cosmetic composition of the present invention contains water. As the water, deionized water or distilled water is preferred. In addition, tap water, groundwater, etc. sterilized with hypochlorous acid or the like may be used as long as the stability of the composition is not impaired.

[0062] <Content> The content of component (A) in the skin cosmetic composition is more than 0.2% by mass, preferably 0.3% by mass or more, more preferably 0.45% by mass or more, still more preferably 0.6% by mass or more, from the viewpoint of improving environmental responsiveness. Also, from the viewpoints of improving the water vapor barrier property in a low humidity environment and usability, it is less than 3.0% by mass, preferably 2.5% by mass or less, more preferably 1.9% by mass or less, still more preferably 1.6% by mass or less. And the content of component (A) in the skin cosmetic composition is more than 0.2% by mass and less than 3.0% by mass, preferably 0.3% by mass or more and 2.5% by mass or less, more preferably 0.45% by mass or more and 1.9% by mass or less, still more preferably 0.6% by mass or more and 1.6% by mass or less.

[0063] The content of component (B) in the skin cosmetic composition is more than 0.1% by mass, preferably 0.2% by mass or more, more preferably 0.35% by mass or more, still more preferably 0.5% by mass or more, and even more preferably 0.6% by mass or more, from the viewpoint of improving the water vapor barrier property in a low humidity environment. Also, from the viewpoints of improving environmental responsiveness and improving the dispersibility of component (B), it is less than 3.0% by mass, preferably 2.55% by mass or less, more preferably 2.0% by mass or less, still more preferably 1.75% by mass or less, and even more preferably 1.25% by mass or less. And the content of component (B) in the skin cosmetic composition is more than 0.1% by mass and less than 3.0% by mass, preferably 0.2% by mass or more and 2.55% by mass or less, more preferably 0.35% by mass or more and 2.0% by mass or less, still more preferably 0.5% by mass or more and 1.75% by mass or less, and even more preferably 0.6% by mass or more and 1.25% by mass or less.

[0064] The content of component (C) in the skin cosmetic composition is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, and even more preferably 3.5% by mass or more, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving environmental responsiveness, and improving the feel of use. Also, from the viewpoint of improving the feel of use, it is preferably 30% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less, and even more preferably 10% by mass or less. And the content of component (C) in the skin cosmetic composition is preferably 0.5% by mass or more and 30% by mass or less, more preferably 1.0% by mass or more and 20% by mass or less, still more preferably 2.0% by mass or more and 15% by mass or less, and even more preferably 3.5% by mass or more and 10% by mass or less.

[0065] The content of component (C1) in the skin cosmetic composition is preferably 0.08% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.8% by mass or more, and even more preferably 1.0% by mass or more, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability. Also, from the viewpoint of improving the usability, it is preferably 25% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and even more preferably 5.0% by mass or less. And the content of component (C1) in the skin cosmetic composition is preferably 0.08% by mass or more and 25% by mass or less, more preferably 0.2% by mass or more and 15% by mass or less, still more preferably 0.8% by mass or more and 10% by mass or less, and even more preferably 1.0% by mass or more and 5.0% by mass or less.

[0066] The content of component (C2) in the skin cosmetic composition is preferably 0.2% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more, from the viewpoints of improving the water vapor barrier property in a low humidity environment, improving the environmental responsiveness, and improving the usability. Also, from the viewpoint of improving the usability, it is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and even more preferably 5.0% by mass or less. And the content of component (C2) in the skin cosmetic composition is preferably 0.2% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 15% by mass or less, still more preferably 1.0% by mass or more and 10% by mass or less, and even more preferably 1.5% by mass or more and 5.0% by mass or less.

[0067] The water content in the skin cosmetic composition is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 70% by mass or more, from the viewpoints of improving the usability, improving the solubility of component (A), and improving the dispersibility of component (B). The water content in the skin cosmetic composition may be the balance of components (A) to (C).

[0068] The mass ratio [(A) / (B)] of component (A) to component (B) in the skin cosmetic composition is preferably 0.08 or more, more preferably 0.2 or more, still more preferably 0.3 or more, even more preferably 1.0 or more, and even more preferably 1.3 or more from the viewpoint of improving environmental responsiveness. Also, from the viewpoint of improving the water vapor barrier property in a low humidity environment, it is preferably 25 or less, more preferably 17 or less, still more preferably 12 or less, even more preferably 8.7 or less, and even more preferably 3.0 or less. And the mass ratio [(A) / (B)] of component (A) to component (B) in the skin cosmetic composition is preferably 0.08 or more and 25 or less, more preferably 0.2 or more and 17 or less, still more preferably 0.3 or more and 12 or less, even more preferably 1.0 or more and 8.7 or less, and even more preferably 1.3 or more and 3.0 or less.

[0069] The mass ratio [(C) / (A)] of component (C) to component (A) in the skin cosmetic composition is preferably 1.0 or more, more preferably 1.3 or more, still more preferably 1.75 or more, and even more preferably 2.0 or more from the viewpoint of improving the usability. Also, from the viewpoints of improving the water vapor barrier property in a low humidity environment and improving environmental responsiveness, it is preferably 50 or less, more preferably 30 or less, still more preferably 20 or less, and even more preferably 14 or less. And the mass ratio [(C) / (A)] of component (C) to component (A) in the skin cosmetic composition is preferably 1.0 or more and 50 or less, more preferably 1.3 or more and 30 or less, still more preferably 1.75 or more and 20 or less, and even more preferably 2.0 or more and 14 or less.

[0070] The mass ratio [(C) / (B)] of component (C) to component (B) in the skin cosmetic composition is preferably 0.1 or more, more preferably 0.5 or more, still more preferably 2.0 or more, even more preferably 2.5 or more, and even more preferably 3.0 or more from the viewpoint of improving the usability. Also, from the viewpoints of improving the water vapor barrier property in a low humidity environment and improving the environmental responsiveness, it is preferably 100 or less, more preferably 50 or less, still more preferably 20 or less, even more preferably 13.3 or less, and even more preferably 10 or less. And the mass ratio [(C) / (B)] of component (C) to component (B) in the skin cosmetic composition is preferably 0.1 or more and 100 or less, more preferably 0.5 or more and 50 or less, still more preferably 2.0 or more and 20 or less, even more preferably 2.5 or more and 13.3 or less, even more preferably 2.5 or more and 10 or less, and even more preferably 3.0 or more and 10 or less.

[0071] The mass ratio [{(A)+(C)} / (B)] of the total amount of component (A) and component (C) to component (B) in the skin cosmetic composition is preferably 0.3 or more, more preferably 1.0 or more, still more preferably 3.0 or more, even more preferably 3.4 or more, even more preferably 4.0 or more, and even more preferably 5.0 or more from the viewpoint of improving the usability. Also, from the viewpoints of improving the water vapor barrier property in a low humidity environment and improving the environmental responsiveness, it is preferably 100 or less, more preferably 50 or less, still more preferably 30 or less, even more preferably 22 or less, even more preferably 17 or less, and even more preferably 9.6 or less. And the mass ratio [{(A)+(C)} / (B)] is preferably 0.3 or more and 100 or less, more preferably 1.0 or more and 50 or less, still more preferably 3.0 or more and 30 or less, even more preferably 3.4 or more and 22 or less, even more preferably 4.0 or more and 17 or less, and even more preferably 5.0 or more and 9.6 or less.

[0072] <Component (D): Cationic Polymer> The skin cosmetic composition can further contain (D) a cationic polymer from the viewpoints of improving the usability and improving the water resistance when sweating or coming into contact with water in the living environment. Component (D) is a polymer capable of forming a polyion complex by interaction with component (A). Since the polyion complex has a cross-linked structure and is hydrophobic, it is possible to form a coating film with high water resistance. In the following description, "improvement of water resistance" means "improvement of water resistance when sweating or coming into contact with water in the living environment". The cationic polymer as component (D) is preferably a polymer having a cationic group and positively charged as a total charge. However, component (D) may have an anionic group, a nonionic group, or an amphoteric group such as a betaine group in addition to the cationic group as long as the effects of the present invention are not inhibited.

[0073] From the viewpoints of improving the usability and water resistance, component (D) is preferably at least one cationic polymer selected from the group consisting of (D1) a cationic polymer containing a structural unit represented by the following general formula (2), and (D2) a cationized polysaccharide. [Chemical formula] In formula (2), R 11 is a hydrogen atom or a methyl group, and R 12 ~R 14 are each independently an alkyl group having 1 to 4 carbon atoms. X is -O- or -NH-, and m is a number from 1 to 4.

[0074] (Component (D1): A cationic polymer containing a structural unit represented by general formula (2)) Component (D1) is a cationic polymer containing the structural unit represented by the general formula (2). R 11 in the general formula (2) is preferably a methyl group, and R 12 ~R 14 are each independently preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group or an ethyl group, and still more preferably a methyl group. In general formula (2), X is preferably -O-, and m is preferably 1 or more and 3 or less, more preferably 2 or more and 3 or less.

[0075] Examples of the structural unit represented by general formula (2) include one or more selected from the group consisting of a structural unit derived from a methacryloylethyltrimethylammonium salt, a structural unit derived from a diethyl sulfate salt of N,N-dimethylaminoethyl methacrylate, and a structural unit derived from a methacrylamidopropyltrimethylammonium salt. Preferably, it is one or more selected from the group consisting of a structural unit derived from a methacryloylethyltrimethylammonium salt and a structural unit derived from a diethyl sulfate salt of N,N-dimethylaminoethyl methacrylate.

[0076] In component (D1), from the viewpoint of improving the usability and water resistance, the content of the structural unit represented by the general formula (2) is preferably 8.0 mol% or more and 100 mol% or less in all the structural units constituting component (D1).

[0077] Component (D1) may be a polymer containing other structural units in addition to the structural unit represented by the general formula (2). Examples of such other structural units include structural units derived from vinyl monomers such as vinylpyrrolidone, amphoteric monomers such as (meth)acryloylethyldimethylbetaine, alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, acrylamides such as N,N-dimethylacrylamide, and the like. Component (D1) may also be a cross-polymer cross-linked with polyethylene glycol di(meth)acrylate or the like.

[0078] Preferable specific examples of the cationic polymer containing the structural unit represented by the general formula (2) include methacryloyloxyethyltrimethylammonium chloride polymer (polyquaternium-37), methacryloyloxyethyldimethylbetaine·methacryloyloxyethyltrimethylammonium chloride·methacrylic acid methoxypolyethylene glycol copolymer (polyquaternium-49), methacryloyloxyethyldimethylbetaine·methacryloyloxyethyltrimethylammonium chloride·2-hydroxyethyl methacrylate copolymer (polyquaternium-48), and N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·dimethacrylic acid polyethylene glycol copolymer (polyquaternium-52). One or more selected from the group consisting of these are mentioned. Among these, from the viewpoints of usability and improvement of water resistance, preferably one or more selected from the group consisting of methacryloyloxyethyltrimethylammonium chloride polymer (polyquaternium-37) and N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·dimethacrylic acid polyethylene glycol copolymer (polyquaternium-52).

[0079] As the component (D1), a commercially available polymer can also be used. Specific examples thereof include "Soft Care KG-101W-E" (polyquaternium-52), "Soft Care KG-301W" (polyquaternium-52), "Polymer KG30" (polyquaternium-52), "KP Polymer E" (polyquaternium-37) manufactured by Kao Corporation, and "Cosmedia Ultragel 300" (polyquaternium-37) manufactured by BASF Japan Ltd.

[0080] (Component (D2): Cationized polysaccharide) Component (D2) is a cationized polysaccharide. In the present specification, "cationized polysaccharide" refers to a modified polysaccharide in which a cationic group is introduced into the polymer backbone of the polysaccharide. Specific examples of the cationized polysaccharide include cationized galactomannans such as cationized guar gum, cationized tara gum, cationized fenugreek gum, and cationized locust bean gum; cationized polymers having a cellulose backbone such as cationized cellulose, cationized hydroxyethyl cellulose, cationized hydroxypropyl cellulose, and cationized carboxymethyl cellulose; cationized starch; and the like. Among these, from the viewpoints of usability and improvement of water resistance, the cationized polysaccharide is preferably at least one selected from the group consisting of cationized galactomannans and cationized polymers having a cellulose backbone, more preferably a cationized polymer having a cellulose backbone, still more preferably cationized hydroxyethyl cellulose, and even more preferably hydroxyethyl cellulose hydroxypropyltrimethylammonium chloride ether (also known as o-[2-hydroxy-3-(trimethylammonio)propyl] hydroxyethyl cellulose chloride, polyquaternium-10).

[0081] As the component (D2), a commercially available polymer can also be used. Specific examples thereof include cationized guar gums of the "Jaguar C" series manufactured by Solvay and the "Rabol Gum" series manufactured by DSP Gohsei Hood & Chemical Co., Ltd.; cationized celluloses of the "Poise C" series manufactured by Kao Corporation and the "Katinar" series manufactured by Toho Chemical Industry Co., Ltd.

[0082] From the viewpoints of usability and improvement of water resistance, the component (D) preferably contains at least one selected from the group consisting of methacryloylethyltrimethylammonium chloride polymer (polyquaternium-37), N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·dimethacrylic acid polyethylene glycol copolymer (polyquaternium-52), and hydroxyethyl cellulose hydroxypropyltrimethylammonium chloride ether (polyquaternium-10), and more preferably contains methacryloylethyltrimethylammonium chloride polymer (polyquaternium-37).

[0083] When the skin cosmetic composition contains component (D), the content of component (D) in the skin cosmetic composition is preferably 0.02% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more from the viewpoints of usability and improvement of water resistance. Also, from the viewpoint of improving blending stability, it is preferably 10% by mass or less, more preferably 8.0% by mass or less, still more preferably 5.0% by mass or less, even more preferably 2.0% by mass or less, and even more preferably 1.0% by mass or less. And the content of component (D) in the skin cosmetic composition is preferably 0.02% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 8.0% by mass or less, still more preferably 0.1% by mass or more and 5.0% by mass or less, even more preferably 0.2% by mass or more and 2.0% by mass or less, and even more preferably 0.2% by mass or more and 1.0% by mass or less.

[0084] <Component (E): Oil agent> From the viewpoint of improving usability, the skin cosmetic composition can further contain (E) an oil agent. The oil agent may be any one usually used in skin cosmetic compositions, and examples thereof include silicone oil, ester oil, ether oil, hydrocarbon oil, higher fatty acid, waxes, etc., and one or more of these can be used. Among the above, from the viewpoint of improving usability, it is preferably at least one selected from the group consisting of silicone oil, ester oil, hydrocarbon oil, and higher fatty acid, and more preferably ester oil.

[0085] Examples of the ester oil include synthetic ester oil and natural fats and oils. Examples of the synthetic ester oil include esters of monocarboxylic acids and monohydric alcohols, esters of monocarboxylic acids and polyhydric alcohols, and esters of polycarboxylic acids and monohydric alcohols.

[0086] Among the synthetic ester oils, specific examples of esters of monocarboxylic acids and monohydric alcohols include cetyl isooctanoate, stearyl isooctanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, butyl myristate, isopropyl myristate, decyl myristate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, isostearyl palmitate, 2-hexyldecyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, methyl ricinoleate (castor oil fatty acid methyl ester), and alkyl benzoates (alkyl having 12 to 15 carbon atoms), and one or more selected from the group consisting of these may be mentioned.

[0087] Specific examples of esters of monocarboxylic acids and polyhydric alcohols include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di(2-ethylhexanoate), propane diol di(caprylate / caprate), propane diol diisostearate, ethylene glycol di(2-ethylhexanoate), glyceryl tri(caprylate / caprate), glyceryl tri(2-ethylhexanoate), glyceryl tri(2-heptylundecanoate), trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate, and pentaerythritol tetra(2-ethylhexanoate), and one or more selected from the group consisting of these may be mentioned.

[0088] Specific examples of esters of polyvalent carboxylic acids and monohydric alcohols include diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, and the like.

[0089] Examples of natural oils and fats include triglycerides such as avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, mink oil, and the like.

[0090] When the skin cosmetic composition contains component (E), the content of component (E) in the skin cosmetic composition is preferably 0.2% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and even more preferably 3.0% by mass or more from the viewpoint of improving the feeling of use. Also, from the viewpoint of improving the blending stability, it is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and even more preferably 8.0% by mass or less. And the content of component (E) in the skin cosmetic composition is preferably 0.2% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 10% by mass or less, still more preferably 1.0% by mass or more and 10% by mass or less, and even more preferably 3.0% by mass or more and 8.0% by mass or less.

[0091] In addition, surfactants, pH adjusters, feel improvers, colorants, antioxidants, anti-dandruff agents, vitamin agents, bactericides, anti-inflammatory agents, preservatives, chelating agents, moisturizers, pearl agents, ceramides, plant extracts, ultraviolet absorbers, etc. can be blended as optional components in the skin cosmetic composition.

[0092] <Form of the skin cosmetic composition> Since the skin cosmetic composition of the present invention contains water, its form is preferably an aqueous composition substantially free of an oil agent, an oil-in-water type emulsion composition, or a water-in-oil type emulsion composition. From the viewpoint of improving environmental responsiveness, the form of the skin cosmetic composition is preferably an aqueous composition substantially free of an oil agent or an oil-in-water type emulsion composition, and more preferably an aqueous composition substantially free of an oil agent. "Substantially free of an oil agent" means that the content of the oil agent in the skin cosmetic composition is preferably 5.0% by mass or less, more preferably 2.0% by mass or less, still more preferably 1.0% by mass or less, and even more preferably 0.1% by mass or less.

[0093] <Dosage form and product form of the skin cosmetic composition> From the viewpoint of the effectiveness of the effects of the present invention, the skin cosmetic composition is preferably a leave-on type skin cosmetic composition that is used without being washed off after being applied to the skin. Examples of the dosage form of the skin cosmetic composition include cream, lotion, gel, essence, or lotion. From the viewpoint of improving environmental responsiveness, it is preferably lotion, gel, or lotion, and more preferably gel or lotion. Examples of the product form of the skin cosmetic composition include skin care lotion, skin care lotion, skin care cream, BB lotion, BB lotion, BB cream, essence, hand cream, lip care agent, sunscreen, etc. for the face or body. Among the above, from the viewpoint of improving environmental responsiveness, the skin cosmetic composition of the present invention is preferably a skin care lotion, skin care lotion, skin care cream, BB lotion, BB lotion, BB cream, essence, hand cream, or lip care agent for the face or body, more preferably a skin care lotion or a skin care lotion, and still more preferably a skin care lotion.

[0094] <Method for producing the skin cosmetic composition> The method for producing the skin cosmetic composition is not particularly limited, and each component can be mixed and produced by a known method. When the skin cosmetic composition contains a (D) cationic polymer, from the viewpoints of improving blending stability and production efficiency, the production method of the composition of the present invention preferably includes a step of mixing an aqueous dispersion containing component (A) and component (B) with component (D). More specifically, it is more preferable to have a step of preliminarily preparing an aqueous dispersion containing component (A) and component (B), and then mixing the aqueous dispersion with component (D) or a solution thereof. The mixing conditions when mixing each component are not particularly limited, and usually, it can be carried out at 5 to 60 °C for 0.1 to 12 hours using a known stirring device.

[0095] Hereinafter, regarding the above-described embodiments, the present invention further discloses the following. <1> (A) At least one selected from the group consisting of an anionic polymer and a nonionic polymer having a viscosity of 5,000 mPa·s or more at 25 °C in a 2% by mass aqueous solution, (B) at least one selected from the group consisting of a water-swellable clay mineral and water-swellable mica, (C) a polyhydric alcohol, and a skin cosmetic composition containing water, The skin cosmetic composition, wherein the content of component (A) in the skin cosmetic composition is more than 0.2% by mass and less than 3.0% by mass, and the content of component (B) is more than 0.1% by mass and less than 3.0% by mass. <2> The viscosity of the 2% by mass aqueous solution of component (A) at 25 °C is preferably 5,000 mPa·s or more and 200,000 mPa·s or less, more preferably 10,000 mPa·s or more and 180,000 mPa·s or less, still more preferably 30,000 mPa·s or more and 150,000 mPa·s or less, even more preferably 50,000 mPa·s or more and 120,000 mPa·s or less, and even more preferably 70,000 mPa·s or more and 100,000 mPa·s or less, of the skin cosmetic composition of <1>. <3> The anionic polymer as the component (A) includes at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfuric acid group, (A2) an anionic polymer having a structural unit represented by the following general formula (1), and (A3) an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid, in the skin cosmetic composition of <1> or <2>.

Chemical formula

[0096] <11> The component (A6) preferably contains a derivative of a nonionic polysaccharide, more preferably contains a derivative of a nonionic polysaccharide having a substituent containing an alkyl group having 8 or more carbon atoms, and still more preferably contains a cellulose derivative having a substituent containing an alkyl group having 8 or more carbon atoms, and is a skin cosmetic composition according to any one of <8> to <10>. <12> The cellulose derivative having a substituent containing an alkyl group having 8 or more carbon atoms includes a compound obtained by introducing a substituent containing an alkyl group having 8 or more carbon atoms into cellulose having a hydroxyalkyl group or a dihydroxyalkyl group, and preferably includes one or more selected from the group consisting of cetyl hydroxyethyl cellulose and stearoxy PG hydroxyethyl cellulose. The skin cosmetic composition of <11>. <13> The component (A) preferably includes one or more selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, (A2) an anionic polymer having a structural unit represented by the general formula (1), (A3) an anionic polymer other than (A2) having a structural unit derived from (meth) acrylic acid, (A4) a nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth) acrylamide, (A5) a nonionic polymer containing a structural unit derived from (meth) acrylic acid ester, and (A6) a nonionic polysaccharide. More preferably, it includes one or more selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, (A2) an anionic polymer having a structural unit represented by the general formula (1), (A4) a nonionic polymer containing a structural unit derived from N-substituted or unsubstituted (meth) acrylamide, and (A6) a nonionic polysaccharide. Even more preferably, it includes one or more selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, and (A6) a nonionic polysaccharide. The skin cosmetic composition of any one of <1> to <12>. <14> The component (A) preferably includes one or more selected from the group consisting of sodium stearoxy PG hydroxyethyl cellulose sulfonate, (sodium acrylate / sodium acryloyldimethyltaurine) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer, polyacrylamide, and stearoxy PG hydroxyethyl cellulose. More preferably, it includes one or more selected from the group consisting of sodium stearoxy PG hydroxyethyl cellulose sulfonate and stearoxy PG hydroxyethyl cellulose. The skin cosmetic composition of any one of <1> to <13>. <15> The skin cosmetic composition according to any one of <1> to <14>, wherein the component (B) has a water swelling degree of 20 mL / 2 g or more as determined by the following test method. (Test method) Put 100 mL of ion-exchanged water into a 100 mL graduated cylinder. Add 2 g of the component (B) little by little in several portions so as not to stick to the wall surface of the graduated cylinder. After all of the component (B) has settled naturally to the bottom of the graduated cylinder, read the volume (mL) of the component (B) after 24 hours from the scale. The average value of three tests is taken as the water swelling degree (mL / 2 g) of the component (B). <16> The skin cosmetic composition according to any one of <1> to <15>, wherein the water swelling degree of the component (B) is preferably 20 mL / 2 g or more and 90 mL / 2 g or less, more preferably 25 mL / 2 g or more and 90 mL / 2 g or less, still more preferably 30 mL / 2 g or more and 85 mL / 2 g or less, even more preferably 35 mL / 2 g or more and 85 mL / 2 g or less, even more preferably 40 mL / 2 g or more and 85 mL / 2 g or less, even more preferably 50 mL / 2 g or more and 80 mL / 2 g or less, even more preferably 60 mL / 2 g or more and 80 mL / 2 g or less. <17> The skin cosmetic composition according to any one of <1> to <16>, wherein the aspect ratio of the component (B) is preferably 40 or more and 2000 or less, more preferably 70 or more and 1000 or less, still more preferably 100 or more and 600 or less, even more preferably 150 or more and 500 or less, even more preferably 200 or more and 400 or less. <18> The skin cosmetic composition according to any one of <1> to <17>, wherein the average particle diameter of the component (B) is preferably 100 nm or more and 2000 nm or less, more preferably 200 nm or more and 1500 nm or less, still more preferably 300 nm or more and 1000 nm or less. <19> The skin cosmetic composition according to any one of <1> to <18>, wherein the water-swellable clay mineral contains one or more selected from the group consisting of smectite, bentonite, montmorillonite, beidellite, nontronite, saponite, stevensite, and hectorite. <20> The skin cosmetic composition according to any one of <1> to <19>, wherein the water-swellable mica contains sodium tetrasilicate mica.

[0097] <21> The skin cosmetic composition according to any one of <1> to <20>, wherein the component (B) preferably contains one or more selected from the group consisting of water-swellable smectite, water-swellable bentonite, water-swellable montmorillonite, water-swellable hectorite, and water-swellable mica, more preferably contains one or more selected from the group consisting of magnesium aluminum silicate, water-swellable bentonite, water-swellable hectorite, and sodium tetrasilicate mica, still more preferably contains one or more selected from the group consisting of water-swellable bentonite and sodium tetrasilicate mica, and even more preferably contains water-swellable bentonite. <22> The skin cosmetic composition according to any one of <1> to <21>, wherein the component (C) is preferably a low-molecular polyhydric alcohol, more preferably a polyhydric alcohol having a molecular weight of 1,000 or less, still more preferably a molecular weight of 800 or less, and even more preferably a molecular weight of 500 or less. <23> The skin cosmetic composition according to any one of <1> to <22>, wherein the component (C) is one or more selected from the group consisting of (C1) an alcohol having 3 or more valences and (C2) a dihydric alcohol, preferably contains at least (C2) a dihydric alcohol, and more preferably contains (C1) an alcohol having 3 or more valences and (C2) a dihydric alcohol. <24> The skin cosmetic composition of <23>, wherein the component (C1) is preferably an alcohol having 3 or more valences and 20 or less valences, and more preferably an alcohol having 3 or more valences and 12 or less valences. <25> The skin cosmetic composition of <23> or <24>, wherein the carbon number of the component (C1) is preferably 3 or more and 24 or less, more preferably 3 or more and 18 or less, and still more preferably 3 or more and 12 or less. <26> The skin cosmetic composition according to any one of <23> to <25>, wherein the component (C1) contains at least one selected from the group consisting of trimethylolpropane, glycerin or its condensate, and sugar alcohol, preferably contains at least one selected from the group consisting of glycerin, diglycerin, polyglycerin, and sugar alcohol, and more preferably contains at least one selected from the group consisting of glycerin, sorbitol, and maltitol. <27> The skin cosmetic composition according to any one of <23> to <26>, wherein the number of carbon atoms of the component (C2) is preferably 2 or more and 12 or less, more preferably 3 or more and 12 or less, and still more preferably 3 or more and 8 or less. <28> The skin cosmetic composition according to any one of <23> to <27>, wherein the component (C2) is preferably a chain alcohol, and more preferably a saturated chain alcohol. <29> The skin cosmetic composition according to any one of <23> to <28>, wherein the component (C2) contains at least one selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,3 - propanediol, 1,3 - butylene glycol, and pentanediol, preferably contains at least one selected from the group consisting of dipropylene glycol and 1,3 - butylene glycol. <30> The skin cosmetic composition according to any one of <1> to <29>, wherein the component (C) preferably contains at least one selected from the group consisting of glycerin, diglycerin, polyglycerin, sugar alcohol, dipropylene glycol, and 1,3 - butylene glycol, more preferably contains at least one selected from the group consisting of glycerin, sorbitol, maltitol, dipropylene glycol, and 1,3 - butylene glycol, and still more preferably contains (C1) at least one selected from the group consisting of glycerin, sorbitol, and maltitol and (C2) at least one selected from the group consisting of dipropylene glycol and 1,3 - butylene glycol.

[0098] <31> The content of the component (C1) in the component (C) is preferably 10% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more, even more preferably 40% by mass or more, and preferably 100% by mass or less, more preferably 90% by mass or less, still more preferably 80% by mass or less, even more preferably 70% by mass or less. The skin cosmetic composition according to any one of <23> to <30>. <32> The content of the component (C2) in the component (C) is preferably 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, even more preferably 25% by mass or more, even more preferably 30% by mass or more, and 100% by mass or less. The skin cosmetic composition according to any one of <23> to <31>. <33> The mass ratio [(C2) / (C1)] of the component (C2) to the component (C1) is preferably 0.1 or more and 20 or less, more preferably 0.2 or more and 10 or less, still more preferably 0.3 or more and 5 or less, even more preferably 0.5 or more and 4 or less, even more preferably 0.7 or more and 2 or less. The skin cosmetic composition according to any one of <23> to <32>. <34> The content of the component (A) in the skin cosmetic composition is preferably 0.3% by mass or more and 2.5% by mass or less, more preferably 0.45% by mass or more and 1.9% by mass or less, still more preferably 0.6% by mass or more and 1.6% by mass or less. The skin cosmetic composition according to any one of <1> to <33>. <35> The content of the component (B) in the skin cosmetic composition is preferably 0.2% by mass or more and 2.55% by mass or less, more preferably 0.35% by mass or more and 2.0% by mass or less, still more preferably 0.5% by mass or more and 1.75% by mass or less, even more preferably 0.6% by mass or more and 1.25% by mass or less. The skin cosmetic composition according to any one of <1> to <34>. <36> The content of the component (C) in the skin cosmetic composition is preferably 0.5% by mass or more and 30% by mass or less, more preferably 1.0% by mass or more and 20% by mass or less, still more preferably 2.0% by mass or more and 15% by mass or less, and even more preferably 3.5% by mass or more and 10% by mass or less, and it is a skin cosmetic composition according to any one of <1> to <35>. <37> The content of the component (C1) in the skin cosmetic composition is preferably 0.08% by mass or more and 25% by mass or less, more preferably 0.2% by mass or more and 15% by mass or less, still more preferably 0.8% by mass or more and 10% by mass or less, and even more preferably 1.0% by mass or more and 5.0% by mass or less, and it is a skin cosmetic composition according to any one of <23> to <36>. <38> The content of the component (C2) in the skin cosmetic composition is preferably 0.2% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 15% by mass or less, still more preferably 1.0% by mass or more and 10% by mass or less, and even more preferably 1.5% by mass or more and 5.0% by mass or less, and it is a skin cosmetic composition according to any one of <23> to <37>. <39> The content of water in the skin cosmetic composition is preferably 30% by mass or more, more preferably 40% by mass or more, still more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 70% by mass or more, and it is a skin cosmetic composition according to any one of <1> to <38>. <40> The mass ratio [(A) / (B)] of the component (A) to the component (B) in the skin cosmetic composition is preferably 0.08 or more and 25 or less, more preferably 0.2 or more and 17 or less, still more preferably 0.3 or more and 12 or less, even more preferably 1.0 or more and 8.7 or less, and even more preferably 1.3 or more and 3.0 or less, and it is a skin cosmetic composition according to any one of <1> to <39>.

[0099] <41> The mass ratio [(C) / (A)] of the component (C) to the component (A) in the skin cosmetic composition is preferably 1.0 or more and 50 or less, more preferably 1.3 or more and 30 or less, still more preferably 1.75 or more and 20 or less, and even more preferably 2.0 or more and 14 or less, and the skin cosmetic composition is any one of <1> to <40>. <42> The mass ratio [(C) / (B)] of the component (C) to the component (B) in the skin cosmetic composition is preferably 0.1 or more and 100 or less, more preferably 0.5 or more and 50 or less, still more preferably 2.0 or more and 20 or less, even more preferably 2.5 or more and 13.3 or less, even more preferably 2.5 or more and 10 or less, and even more preferably 3.0 or more and 10 or less, and the skin cosmetic composition is any one of <1> to <41>. <43> The mass ratio [{(A)+(C)} / (B)] of the total amount of the component (A) and the component (C) to the component (B) in the skin cosmetic composition is preferably 0.3 or more and 100 or less, more preferably 1.0 or more and 50 or less, still more preferably 3.0 or more and 30 or less, even more preferably 3.4 or more and 22 or less, even more preferably 4.0 or more and 17 or less, and even more preferably 5.0 or more and 9.6 or less, and the skin cosmetic composition is any one of <1> to <42>. <44> The skin cosmetic composition further contains (D) a cationic polymer, and the skin cosmetic composition is any one of <1> to <43>. <45> The component (D) is preferably at least one cationic polymer selected from the group consisting of (D1) a cationic polymer containing a structural unit represented by the following general formula (2) and (D2) a cationized polysaccharide, and the skin cosmetic composition is <44>.

Chemical formula

[0100] <51> The component (E) is one or more selected from the group consisting of silicone oil, ester oil, ether oil, hydrocarbon oil, higher fatty acid, and waxes, preferably one or more selected from the group consisting of silicone oil, ester oil, hydrocarbon oil, and higher fatty acid, and more preferably ester oil. The skin cosmetic composition is <50>. <52> The content of the component (E) in the skin cosmetic composition is preferably 0.2% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 10% by mass or less, still more preferably 1.0% by mass or more and 10% by mass or less, and even more preferably 3.0% by mass or more and 8.0% by mass or less. The skin cosmetic composition is <50> or <51>. <53> The skin cosmetic composition is preferably an aqueous composition, an oil-in-water emulsion composition, or a water-in-oil emulsion composition that substantially does not contain an oil agent, more preferably an aqueous composition or an oil-in-water emulsion composition that substantially does not contain an oil agent, and still more preferably an aqueous composition that substantially does not contain an oil agent, and is any one of the skin cosmetic compositions of <1> to <52>. <54> The skin cosmetic composition is preferably a leave-on type skin cosmetic composition that is used without being washed off after being applied to the skin, and is any one of the skin cosmetic compositions of <1> to <53>. <55> The dosage form of the skin cosmetic composition is cream, emulsion, gel, beauty liquid or lotion, preferably emulsion, gel or lotion, and more preferably gel or lotion, and is any one of the skin cosmetic compositions of <1> to <54>.

Examples

[0101] Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the scope of the examples. The measurements and evaluations in the examples were performed by the following methods.

[0102] (Measurement of viscosity of 2% by mass aqueous solution of polymer) A 2% by mass aqueous solution of the anionic polymer and nonionic polymer (component (A) or component (A')) used in each example was prepared, and the viscosity of the aqueous solution at 25 °C was measured by the following method. In this example, anionic polymers and nonionic polymers other than component (A) were designated as "component (A')". ·Less than 500 mPa·s: Measured at 10 rpm using a Brookfield viscometer "DV2T" manufactured by Eiko Seiki Co., Ltd., spindle: CPA-41Z (angle 3 deg, radius 24 mm). ·500 mPa·s or more and less than 3,000 mPa·s: Measured at 30 rpm using a B-type viscometer "TVB-10" manufactured by Toki Sangyo Co., Ltd., spindle: M3. ·3,000 mPa·s or more and less than 20,000 mPa·s: Measured at 30 rpm using a B-type viscometer "TVB-10" manufactured by Toki Sangyo Co., Ltd., spindle: M4. · Above 20,000 mPa·s and less than 30,000 mPa·s: Measured at 10 rpm using the B-type viscometer "TVB-10" manufactured by Toki Sangyo Co., Ltd., and the "T stage" and T-C. · 30,000 mPa·s or above: Measured at 10 rpm using the B-type viscometer "TVB-10" manufactured by Toki Sangyo Co., Ltd., and the "T stage" and T-D.

[0103] (Measurement of the aspect ratio of component (B) or component (B’)) The aspect ratio of component (B) or component (B’) described in the table was determined according to the method described in Clay Science, Vol. 50, No. 3, 162 - 174 (2012). In this example, minerals other than component (B) were denoted as "component (B’)". Regarding ion-exchanged water and aqueous dispersions of component (B) or component (B’) with concentrations of 0.5% by mass, 0.25% by mass, and 0.1% by mass, using a rheometer ("MCR502" manufactured by Anton Paar), at 25 °C and a shear rate of 100 s -1 the viscosity was measured. Using the viscosity of the obtained aqueous dispersion, the viscosity of water, and the volume ratio of component (B) or component (B’), the reduced viscosity of the aqueous dispersion of component (B) or component (B’) at each concentration was determined. A regression line was created with the value of the above reduced viscosity on the vertical axis and the volume ratio of component (B) or component (B’) on the horizontal axis, and the intrinsic viscosity of component (B) or component (B’) was determined from the intercept. The obtained intrinsic viscosity was substituted into the following Simha's equation described in Journal of Physical Chemistry, 44, 25 - 34 (1940) to calculate the aspect ratio of component (B) or component (B’). [Number] [η]: Intrinsic viscosity, f: Aspect ratio

[0104] Among component (B) or component (B’) described in the table, natural clay minerals (Kunipia G4, kaolin) were subjected to the following washing operation before measuring the aspect ratio. The above clay mineral was washed twice with a 1M aqueous sodium acetate solution (pH 5.0) to dissolve and remove carbonates, followed by centrifugation to remove the supernatant. Next, the above clay mineral was washed three times with a 2N aqueous NaCl solution to replace all the interlayer cations of the clay mineral with Na + . After removing the supernatant by centrifugation again, it was washed three times with a 70% aqueous isopropyl alcohol solution. After filtration with a membrane filter (Omnipore Membrane Filters 1.0μm JA), the clay mineral cake was air-dried, ground in a mortar, and then used for measurement.

[0105] Also, for clay minerals (Laponite XLS, kaolin) whose water dispersion viscosity is almost the same as that of water, a regression line could not be created by the above method. This means that the aspect ratio is extremely small, and it was determined that the aspect ratio is 10 or less. In addition, for those that do not mix well with water, such as organically modified clay (Moistnite WO), the aspect ratio could not be measured by the above method.

[0106] (Measurement of the water swelling degree of component (B) or component (B’)) 100 mL of ion-exchanged water was placed in a 100 mL graduated cylinder. 2 g of component (B) or component (B’) was added little by little in several portions so as not to stick to the wall surface of the graduated cylinder. After all of component (B) or component (B’) had naturally settled to the bottom of the graduated cylinder, the volume (mL / 2 g) of component (B) or component (B’) after 24 hours was read from the scale. The test was conducted three times, and the average value was shown in the table as the “water swelling degree (mL / 2 g)”. In addition, for those that do not mix well with water, such as organically modified clay (Moistnite WO), the water swelling degree could not be measured.

[0107] (Measurement of water vapor barrier property (humidity 40%)) Each skin cosmetic composition was applied at 1 g on filter paper (ADVANTEC, No.1, Φ70 mm) and dried overnight. 20 g of silica was placed as a moisture absorbent in a moisture permeability test cup (Φ60 mm, capacity 40 mL), and the cup was covered with the aforementioned filter paper. After measuring the initial weight of the filter paper + cup, it was placed in a thermo-hygrostat (espec "SH-262") set at a temperature of 35°C and a humidity of 40%, and the weights of the filter paper + cup after 1 hour, 2 hours, and 3 hours were measured respectively. The value obtained by subtracting the initial weight of the filter paper + cup from the weight of the filter paper + cup at each time was defined as the moisture absorption amount (g) at each time. The slope of the linear approximation line when plotting the moisture absorption amount on the vertical axis and time on the horizontal axis was defined as the water vapor transmission rate W1 (g / hr) per unit time. Also, the water vapor transmission rate W0 (g / hr) was measured in the same manner using filter paper without the composition applied, and the reduction rate (%) of the water vapor transmission rate was determined from the following formula (1), and the average value with N = 2 was shown in the table. The larger the value of the reduction rate (%) of the water vapor transmission rate, the higher the water vapor barrier property in a low humidity environment. Reduction rate (%) of water vapor transmission rate = {1 - (W1 / W0)} × 100 (1)

[0108] (Measurement of water vapor barrier property (humidity 80%)) The reduction rate of the water vapor transmission rate was measured in the same manner under the conditions of a temperature of 35°C and a humidity of 80%.

[0109] (Environmental responsiveness) The value calculated from the following formula (2) was defined as environmental responsiveness. The larger the value, the higher the humidity responsiveness, which means a good result. Environmental responsiveness (%) = (reduction rate of water vapor transmission rate at 40% humidity) - (reduction rate of water vapor transmission rate at 80% humidity) (2)

[0110] (Smooth and moist feeling after application) Three professional evaluators applied 0.1 g of the skin cosmetic composition of each example to the back of the hand, massaged it, felt the skin immediately afterwards, and sensory-evaluated the smooth and moist feeling after application according to the following criteria. The smooth and moist feeling after application refers to a state where, when touching the skin after application with a finger, the finger moves smoothly without feeling a dry feeling of roughness and has a moisturizing feeling. The evaluation results in the table are shown as the total scores of the three professional evaluators. 3; There is a very strong smooth and moist feeling. 2; There is a smooth and moist feeling. 1; There is not much of a smooth and moist feeling. 0; There is no smooth and moist feeling.

[0111] (Feeling that the skin is protected) Three professional evaluators applied 0.1 g of the skin cosmetic composition of each example to the back of the hand, massaged it, felt the skin immediately afterwards, and sensory-evaluated the feeling that the skin is protected according to the following criteria. The feeling that the skin is protected refers to a state where, when touching the skin after application with a finger, one does not feel the texture of the natural skin itself but feels being protected by the preparation. The evaluation results in the table are shown as the total scores of the three professional evaluators. 3; There is a very strong feeling that the skin is protected. 2; There is a feeling that the skin is protected. 1; There is not much of a feeling that the skin is protected. 0; There is no feeling that the skin is protected.

[0112] (Good spreadability during application) When three professional evaluators applied 0.1 g of the skin cosmetic composition of each example to the back of the hand and massaged it, they sensory-evaluated the good spreadability during application according to the following criteria. The good spreadability during application refers to the ease of spreading the preparation from the initial stage of application. The evaluation results in the table are shown as the total scores of the three professional evaluators. 3; The spreadability during application is very good. 2; The spreadability during application is good. 1; The spreadability during application is not very good. 0; The spreadability during application is not good.

[0113] Production Example 1 (Production of Stearoxy PG Hydroxyethyl Cellulose (C18GE-HEC)) Into a 1 L separable flask, 100 g of hydroxyethyl cellulose (HEC) (“Natrosol HH” manufactured by Ashland) was charged. Under a nitrogen gas atmosphere, 75.6 g of ion-exchanged water and 450.7 g of isopropyl alcohol were added, and the mixture was stirred with a stirring blade at 200 rpm for 5 minutes. To this, 23.6 g of a 48 mass% aqueous sodium hydroxide solution was added and stirred at 40 °C for 30 minutes. Next, 29.6 g of stearyl glycidyl ether was added and reacted by stirring at 80 °C for 5 hours, and then cooled to 50 °C or lower. To this, 21.3 g of a 90 mass% aqueous acetic acid solution was added and stirred for 30 minutes for neutralization. The obtained suspension was evenly placed in two 500 mL centrifuge tubes and centrifuged with a high-speed cooling centrifuge (“CR21G III”, manufactured by Hitachi Koki Co., Ltd.; 1500 g, 40 seconds). To the supernatant recovered by decantation, the same amount of an 85 mass% aqueous isopropyl alcohol solution was added for redispersion, and then centrifuged again. The operations of redispersion and centrifugation were repeated in the same manner. After the third centrifugation, the precipitate was recovered and dried under reduced pressure at 80 °C overnight using a vacuum dryer. The obtained dried product was pulverized with a pulverizer to obtain powdery C18GE-HEC.

[0114] Examples 1 to 27, Comparative Examples 1 to 12 (Preparation and Evaluation of Skin Cosmetic Compositions) A 3 mass% aqueous solution of Component (A) or Component (A’) and a 3.5 mass% aqueous dispersion of Component (B) or Component (B’) were prepared in advance, and each component described in the table was mixed according to the following procedure. A homomixer was used as the mixing device. First, the remaining amount of water was added to the 3 mass% aqueous solution of Component (A) or Component (A’) and stirred, and then the 3.5 mass% aqueous dispersion of Component (B) or Component (B’) was added and stirred. Thereafter, the other components were further added and stirred to obtain the skin cosmetic composition of each example. Using the obtained skin cosmetic composition, various evaluations were performed by the above method. The results are shown in Tables 1 to 6.

[0115]

Table 1

[0116]

Table 2

[0117]

Table 3

[0118]

Table 4

[0119]

Table 5

[0120]

Table 6

[0121] The components described in the table are as follows. Also, the compounding amounts (mass %) described in the table are the active ingredient amounts of each component. <Component (A): Anionic polymer or nonionic polymer> *1: SPS-S-SA: Manufactured by Kao Corporation *9: Simulgel EG QD: Manufactured by SEPIC, active ingredient 37.5% *10: SEPINOV EMT10: Manufactured by SEPIC, active ingredient 89.3% *11: PEMULEN TR-1 POLYMER: Manufactured by Lubrizol Advanced Materials, (acrylates / alkyl acrylate (C10-30)) cross-polymer *12: SEPIGEL 305: Manufactured by SEPIC, active ingredient 40% *13: C18GE-HEC: Stearoxy PG hydroxyethyl cellulose obtained in Production Example 1

[0122] <Component (A'): Anionic polymer or nonionic polymer other than component (A)> *14: Echogum: manufactured by Sumitomo Pharma Food & Chemical Co., Ltd. *15: Sodium polyvinyl sulfonate: manufactured by Polysciences, Inc.

[0123] <Component (B): Water-swellable clay mineral or water-swellable mica> *2: Kunipia G4: manufactured by Kunimine Industries Co., Ltd., average particle size 385 nm *18: NTS-5: manufactured by Top Industry Co., Ltd., average particle size 580 nm *19: Smeton-SA: manufactured by Kunimine Industries Co., Ltd., average particle size 108 nm *20: Smeton-SWN: manufactured by Kunimine Industries Co., Ltd., average particle size 127 nm

[0124] <Component (B'): Minerals etc. other than component (B)> *21: Laponite XLS: manufactured by Rockwood Additives Limited, average particle size 79 nm *22: 2457 Kaolin: manufactured by Brenntag Specialties, Inc, average particle size 309 nm *23: Moistnite WO: manufactured by Kunimine Industries Co., Ltd.

[0125] <Component (C): Polyhydric alcohol> *3: Cosmetic grade concentrated glycerin: manufactured by Kao Corporation *4: 1,3-Butylene glycol-P: manufactured by KH Neochem Co., Ltd. *24: Sorbitol #650 (70% aqueous solution): manufactured by Mitsubishi Corporation Life Sciences Co., Ltd. *25: Amalti syrup (75% aqueous solution): manufactured by Mitsubishi Corporation Life Sciences *26: DPG-RF: manufactured by ADEKA Corporation

[0126] <Component (D): Cationic polymer> *5: KP Polymer E: manufactured by Kao Corporation, polyquaternium-37 active ingredient 35% *16: PoiZ C-60H: Manufactured by Kao Corporation, Polyquaternium-10 *17: Polymer KG30: Manufactured by Kao Corporation, Polyquaternium-52 with an active ingredient content of 30%

[0127] <Component (E): Oil agent> *6: Cropure OL-LQ-(JP): Manufactured by Croda Japan Co., Ltd.

[0128] <Other components> *7: Macbiobride MG-20E(MS): Manufactured by NOF Corporation, Methylgluceth-20 *8: High Solv EPH: Manufactured by Toho Chemical Industry Co., Ltd.

[0129] From the above table, it can be seen that the skin cosmetic composition of the present invention has both high water vapor barrier properties and environmental responsiveness in a low humidity environment, and is also excellent in terms of usability.

[0130] Regarding the above-described embodiments, the present invention further discloses the following formulation examples. The components described in the table are the same as those described above.

[0131]

Table 7

[0132]

Table 8

[0133]

Table 9

Industrial Applicability

[0134] According to the present invention, it is possible to form a coating film that exhibits water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment, and to provide a skin cosmetic composition that is also excellent in terms of usability.

Claims

1. A skin cosmetic composition containing (A) at least one selected from the group consisting of anionic polymers and nonionic polymers having a viscosity of 5,000 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) at least one selected from the group consisting of water-swellable clay minerals and water-swellable mica, and (C) polyhydric alcohol and water, wherein the content of the component (A) in the skin cosmetic composition is more than 0.2% by mass and less than 3.0% by mass, and the content of the component (B) is more than 0.1% by mass and less than 3.0% by mass.

2. The skin cosmetic composition according to Claim 1, wherein the mass ratio [(C) / (B)] of the component (C) to the component (B) is 0.5 or more and 50 or less.

3. The skin cosmetic composition according to Claim 1 or 2, wherein the content of the component (C) in the skin cosmetic composition is 0.5% by mass or more and 30% by mass or less.

4. The skin cosmetic composition according to any one of Claims 1 to 3, wherein the water swelling degree of the component (B) is 20 mL / 2 g or more.

5. The skin cosmetic composition according to any one of Claims 1 to 4, wherein the content of the component (A) in the skin cosmetic composition is 0.45% by mass or more and 1.9% by mass or less.

6. The skin cosmetic composition according to any one of Claims 1 to 5, wherein the content of the component (B) in the skin cosmetic composition is 0.2% by mass or more and 2.55% by mass or less.

7. The skin cosmetic composition according to any one of Claims 1 to 6, wherein the mass ratio [{(A)+(C)} / (B)] of the total amount of the component (A) and the component (C) to the component (B) is 0.3 or more and 100 or less.

8. The skin cosmetic composition according to any one of Claims 1 to 7, wherein the component (C) contains (C1) an alcohol having a valence of 3 or more and (C2) a dihydric alcohol.

9. The skin cosmetic composition according to any one of Claims 1 to 8, wherein the dosage form of the skin cosmetic composition is cream, emulsion, gel, essence or lotion.

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