Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water emulsion cosmetic that is easily kept in a good emulsion state and has a great UV protection effect, and moreover, has both a refreshing use feeling and great rub resistance.SOLUTION: An oil-in-water emulsion cosmetic contains the following component (A1), component (A2), component (B), component (C) and component (D). Component (A1): a water-insoluble organic ultraviolet absorber being solid at 25°C. Component (A2): a liquid oil solution. Component (B): a methacrylamide polymer. Component (C): hydrophobic-treated particulate metal oxide. Component (D): a water-insoluble methacrylate homopolymer.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic. [Background technology]

[0002] In recent years, the importance of UV protection in daily life has increased, leading to a growing need for sunscreen cosmetics. In response to this market need, oil-in-water emulsion sunscreen cosmetics that are pleasant to use and easy to apply over time have been developed.

[0003] In oil-in-water emulsion cosmetics, UV absorbers and UV scattering agents are used to enhance UV protection. For example, 2-ethylhexyl paramethoxycinnamate and octocrylene (2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate) have a maximum absorption wavelength in the UVB region and are highly compatible with oils, making them UV absorbers that have been used in many sunscreen cosmetics. On the other hand, since 2-ethylhexyl paramethoxycinnamate and octocrylene can irritate the skin of users with sensitive skin, sunscreen cosmetics with reduced contents of these ultraviolet absorbers have been proposed (Patent Document 1).

[0004] However, the sunscreen cosmetic described in Patent Document 1 not only lacks sufficient UV protection effect and emulsion stability, but also has poor makeup application when a makeup base or foundation is applied on top of the cosmetic film, and is prone to greasiness due to sebum. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-078054 [Patent Document 2] Patent Publication No. 2021-155417 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, in order to improve makeup application and suppress shine caused by sebum, it has been proposed to reduce the content of 2-ethylhexyl paramethoxycinnamate and octocrylene, and to use a specific mass ratio of hydrophobized fine particle metal oxide to the total content of a water-insoluble organic ultraviolet absorber that is solid at 25°C and a liquid oil agent (Patent Document 2). However, the oil-in-water emulsion cosmetic described in Patent Document 2 has issues with abrasion resistance, and peeling may occur when the surface of the applied area is rubbed strongly. Furthermore, when dextrin palmitate or behenyl alcohol is blended as a thickener to improve this abrasion resistance, the refreshing feel that is characteristic of oil-in-water emulsion cosmetics may be lost, making it difficult to achieve both excellent abrasion resistance and a refreshing feel.

[0007] The present invention relates to providing an oil-in-water emulsion cosmetic that is easy to maintain a good emulsified state, has excellent ultraviolet protection effect, and also has a fresh feeling when used and excellent friction resistance. [Means for solving the problem]

[0008] The present inventors have discovered that by combining a water-insoluble (meth)acrylic acid ester homopolymer with a water-insoluble organic UV absorber that is solid at 25°C, a liquid oil, a (meth)acrylamide polymer, and fine metal oxide particles that have been hydrophobized to form an oil-in-water emulsion cosmetic, it is possible to easily maintain a good emulsion state, and not only exhibit excellent UV protection effects, but also achieve a refreshing feel in use and excellent abrasion resistance, thereby completing the present invention.

[0009] That is, the present invention provides an oil-in-water emulsion cosmetic containing the following components (A1), (A2), (B), (C), and (D): Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): (meth)acrylamide polymer Component (C): Hydrophobically treated fine particle metal oxide Component (D): Water-insoluble (meth)acrylic acid ester homopolymer [Effects of the Invention]

[0010] The oil-in-water emulsion cosmetic of the present invention not only easily maintains a good emulsified state and has an excellent ultraviolet protection effect, but also has a refreshing feel when used and excellent friction resistance. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Oil-in-water emulsion cosmetics] The oil-in-water emulsion cosmetic of the present invention (hereinafter also referred to as "emulsion cosmetic") contains the following components (A1), (A2), (B), (C), and (D). Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): (meth)acrylamide polymer Component (C): Hydrophobically treated fine particle metal oxide Component (D): Water-insoluble (meth)acrylic acid ester homopolymer

[0012] In the present invention, "liquid" refers to a state that has fluidity under an environment of 1 atmosphere and 25°C, i.e., a state under temperature conditions of the melting point or higher (in the case of an amorphous substance that does not have a melting point, a state under temperature conditions of the melting point or higher). Also, "solid" refers to a state that does not have fluidity under an environment of 1 atmosphere and 25°C, i.e., a state under temperature conditions below the melting point (in the case of an amorphous substance that does not have a melting point, a state under temperature conditions below the melting point). In the present invention, the term "water-insoluble" means that the solubility in water is 1 w / w % or less.

[0013] <Component (A1): A water-insoluble organic UV absorber that is solid at 25°C> The oil-in-water emulsion cosmetic of the present invention contains, as component (A1), a water-insoluble organic UV absorber that is solid at 25° C. By including component (A1), the UV protection effect is improved. Examples of component (A1) include 4-tert-butyl-4'-methoxydibenzoylmethane, hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, and 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate. These water-insoluble organic UV absorbers can be used alone or in combination of two or more.

[0014] Among these, from the viewpoints of emulsion stability, UV protection effect, freshness, and abrasion resistance, component (A1) is preferably one or more selected from the group consisting of 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, more preferably 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate. and one or more selected from the group consisting of hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, and a combination of hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine. In the oil-in-water emulsion cosmetic of the present invention, component (A1) is preferably present in a state of being dissolved in component (A2).

[0015] Commercially available products of component (A1) include "PARSOL 1789" (4-tert-butyl-4'-methoxydibenzoylmethane) (manufactured by DSM); "UVINUL A PLUS" (hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate), "UVINUL T-150" (2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine), "UVINUL M40" (2-hydroxy-4-methoxybenzophenone), "TINOSORB S" (2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine) (all manufactured by BASF); and "Mosacare A440" (drometrizole trisiloxane) (UFC CORPORATION); "SOFT SHADE DH" (2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate) (Ajinomoto Co., Inc.).

[0016] The content of component (A1) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.5% by mass or more, more preferably 0.7% by mass or more, even more preferably 1% by mass or more, and even more preferably 2% by mass or more, from the viewpoints of emulsion stability, UV protection effect, moisture, and abrasion resistance. Also, from the viewpoints of emulsion stability, UV protection effect, moisture, and abrasion resistance, it is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less, even more preferably 5% by mass or less, and particularly preferably 2.5% by mass or less. Specifically, it is preferably 0.5 to 10% by mass, more preferably 0.7 to 8% by mass, even more preferably 1 to 6% by mass, even more preferably 2 to 5% by mass, and particularly preferably 2 to 2.5% by mass.

[0017] <Component (A2): Liquid oil> The oil-in-water emulsion cosmetic of the present invention contains a liquid oil as component (A2). By including component (A2), component (A1) dissolves, component (C) is incorporated, and a good emulsified state is achieved. The liquid oil is an oil that has fluidity under an atmosphere of 1 atmosphere and 25°C. Liquid oils are broadly classified into liquid organic UV absorbers and liquid oils other than liquid organic UV absorbers. These liquid oils may be contained alone or in combination of two or more.

[0018] Examples of liquid organic UV absorbers for component (A2) include cinnamic acid-based UV absorbers such as 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, a mixture of isopropyl paramethoxycinnamate and diisopropyl cinnamate, and methyl bis(trimethylsiloxy)silylisopentyl trimethoxycinnamate; para-aminobenzoic acid-based UV absorbers such as amyl paradimethylaminobenzoate and 2-ethylhexyl paradimethylaminobenzoate; salicylic acid-based UV absorbers such as ethylene glycol salicylate, 2-ethylhexyl salicylate, butyloctyl salicylate, benzyl salicylate, and homomenthyl salicylate; octocrylene; dimethicodiethyl benzalmalonate; and copolymers of adipic acid and neopentyl glycol end-blocked with octyldodecanol or cyanodiphenylpropenoic acid. These liquid organic UV absorbers can be used alone or in combination.

[0019] Commercially available liquid organic UV absorbers include, for example, "UVINUL MC80" (2-ethylhexyl paramethoxycinnamate) (manufactured by BASF); "PARSOL 340" (octocrylene) (manufactured by DSM Nutrition Japan Co., Ltd.); "PARSOLEHS" (2-ethylhexyl salicylate), "PARSOL HMS" (homomenthyl salicylate), and "PARSOL SLX" (Polysilicone-15 (INCI name: Polysilicone-15) (dimethicodiethylbenzalmalonate)) (all manufactured by DSM); and "Polycrylene" (Polyester-8 (INCI name: Polyester-8) (a copolymer of adipic acid and neopentyl glycol, the ends of which are blocked with octyldodecanol or cyanodiphenylpropenoic acid) (manufactured by Hall Star).

[0020] However, from the viewpoint of improving the freshness and suppressing stickiness upon application, the total content of 2-ethylhexyl paramethoxycinnamate and octocrylene as component (A2) is preferably 2% by mass or less, more preferably 1.5% by mass or less, even more preferably 1% by mass or less, still more preferably 0.7% by mass or less, still more preferably 0.5% by mass or less, still more preferably 0.3% by mass or less, and still more preferably 0% by mass, of the total amount of the oil-in-water emulsion cosmetic, i.e., 2-ethylhexyl paramethoxycinnamate and octocrylene are not contained.

[0021] From the viewpoint of emulsion stability, the oil-in-water emulsion cosmetic of the present invention preferably contains, as component (A2), a liquid oil other than a liquid organic UV absorber (hereinafter simply referred to as "other liquid oil"). The other liquid oil is not particularly limited as long as it is an oil that has fluidity under an atmosphere of 1 atmosphere and 25°C, other than a liquid organic UV absorber, and examples thereof include oils used in ordinary cosmetics. The other liquid oils include one or more selected from the group consisting of ester oils, silicone oils, hydrocarbon oils, higher alcohols, and higher fatty acids. The other liquid oils may be contained alone or in combination of two or more.

[0022] Examples of ester oils include synthetic ester oils and natural fats and oils, such as esters of monocarboxylic acids and monohydric alcohols, esters of monocarboxylic acids and polyhydric alcohols, and esters of polycarboxylic acids and monohydric alcohols.

[0023] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include esters represented by the following general formula (1). R 1 -COO-R 2 (1) In general formula (1), R 1represents a hydroxyl-substituted or unsubstituted linear or branched alkyl or alkenyl group having from 1 to 25 carbon atoms, or a hydroxyl-substituted or unsubstituted aromatic hydrocarbon group having from 6 to 24 carbon atoms, and R 2 represents a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms.

[0024] R 1 When is an alkyl group or an alkenyl group, R 1 The number of carbon atoms is preferably 7 or more, and is preferably 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less. R 1 When is an aromatic hydrocarbon group, R 1 The number of carbon atoms is preferably 6 or more, and preferably 22 or less, more preferably 20 or less. Specifically, it is a phenyl group. R 2 The number of carbon atoms is preferably 2 or more, and is preferably 28 or less, more preferably 24 or less, even more preferably 22 or less, and still more preferably 20 or less.

[0025] Specific examples of the ester represented by general formula (1) include cetyl isooctanoate (cetyl 2-ethylhexanoate), 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, and palmitic acid. isostearyl phosphate, 2-hexyldecyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, 2-octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, castor oil fatty acid methyl ester (methyl ricinoleate), and alkyl benzoate (alkyl carbon number: 12 to 15).

[0026] Examples of the ester of a monocarboxylic acid and a monohydric alcohol include an ester represented by the following general formula (2). R 3 -COO-(AO) n -R 4 (2) In general formula (2), R 3 represents a hydroxyl-substituted or unsubstituted linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, and R 4 represents an aromatic hydrocarbon group having 6 to 24 carbon atoms, AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and n represents the average number of moles added of 1 to 50. R 3 is preferably an alkyl group having 7 or more carbon atoms, and preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less carbon atoms. R 4is preferably an aromatic hydrocarbon group having 6 or more carbon atoms and 22 or less, more preferably 20 or less, even more preferably 18 or less, and even more preferably a benzyl group. The alkyleneoxy group represented by AO is preferably a propyleneoxy group, and n is preferably 1 or more and 10 or less, more preferably 1 or more and 5 or less. Specific examples of the ester represented by general formula (2) include an ester of myristic acid and a 3-mol propylene oxide adduct of benzyl alcohol (Croda: Crodamol STS), an ester of 2-ethylhexanoic acid and a 3-mol propylene oxide adduct of benzyl alcohol (Croda: Crodamol SFX), and the like.

[0027] Examples of the ester of a monovalent carboxylic acid and a polyhydric alcohol include esters represented by the following general formula (3). R 5 -(OCOR 6 ) p (3) In general formula (3), R 5 represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms, and R 6 represents a monocarboxylic acid residue having 1 to 25 carbon atoms, and p represents an integer of 2 to 10. In addition, R 5 may have an ether bond, but is preferably a straight-chain or branched-chain hydrocarbon group having from 2 to 10 carbon atoms. Also, p is preferably the same number as the number of hydroxy groups in the polyhydric alcohol. R 6 From the viewpoint of stability of the emulsion state, the monovalent carboxylic acid residue represented by the formula (I) is preferably 5 or more, more preferably 7 or more, and is an alkyl group having preferably 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less.

[0028] Examples of the ester represented by general formula (3) include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, propanediol di(caprylic / capric acid), propanediol diisostearate, ethylene glycol di-2-ethylhexanoate, glyceryl tri(caprylic / capric acid), glyceryl tri-2-ethylhexanoate, glyceryl tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, and natural fats and oils. Examples of natural fats and oils include triglycerides of avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.

[0029] Examples of the ester of a polycarboxylic acid and a monohydric alcohol include an ester represented by the following general formula (4). R 7 -(COOR 8 ) q (4) In general formula (4), R 7 is a polycarboxylic acid residue having 2 to 10 carbon atoms, and R 8 represents a monohydric alcohol residue having 1 to 25 carbon atoms, and q is an integer of 2 to 10. Preferably, q is the same number as the number of carboxy groups in the polycarboxylic acid. R 8 From the viewpoint of stability of the emulsion state, the number of carbon atoms is preferably 3 or more, and is preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. Specific examples include diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and tri-2-ethylhexyl trimellitate.

[0030] Among these, from the viewpoint of emulsion stability, the ester oil is preferably at least one selected from the group consisting of esters represented by general formula (1), esters represented by general formula (3), and esters represented by general formula (4), and more preferably a monoester of a linear or branched fatty acid having from 8 to 18 carbon atoms and a linear or branched monohydric alcohol having from 2 to 24 carbon atoms, a triester of a branched fatty acid having from 6 to 18 carbon atoms and glycerin, a tetraester of a branched fatty acid having from 6 to 18 carbon atoms and pentaerythritol, a diester of a branched fatty acid having from 6 to 18 carbon atoms and a branched dihydric alcohol having from 2 to 10 carbon atoms, a triester of a branched monohydric alcohol having from 6 to 18 carbon atoms and trimellitic acid, and alkyl benzoate (C12-15) (for example, "Finsorb TN" (Innospec Active Chemicals) The copolymer is preferably at least one selected from the group consisting of cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, 2-octyldodecyl myristate, isopropyl palmitate, glyceryl tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, and alkyl benzoate (C12-15).

[0031] From the viewpoint of emulsion stability, the silicone oil is preferably dimethylpolysiloxane, and more preferably has a kinematic viscosity of 5,000 mm at 25°C. 2 / s or less dimethylpolysiloxane. The kinematic viscosity of the silicone oil at 25°C can be measured using an Ubbelohde viscometer in accordance with ASTM D 445-46T or JIS Z 8803. Commercially available silicone oils include "KF-96A-6cs" (dimethylpolysiloxane), "KF-96A-10cs" (dimethylpolysiloxane), "KF-96A-20cs" (dimethylpolysiloxane), and "KF-96A-100cs" (dimethylpolysiloxane), all manufactured by Shin-Etsu Chemical Co., Ltd.

[0032] Specific examples of the hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene (liquid isoparaffin, heavy liquid isoparaffin, (C13,14) isoparaffin), cycloparaffin, liquid ozokerite, squalene, squalane, pristane, α-olefin oligomer, polybutene, and isohexadecane. Examples of the higher alcohol include branched or unsaturated higher alcohols having 12 to 24 carbon atoms, such as 2-octyldodecanol, isostearyl alcohol, and oleyl alcohol. Examples of the higher fatty acids include fatty acids having 12 to 22 carbon atoms, such as oleic acid and isostearic acid.

[0033] From the viewpoint of emulsion stability and friction resistance, the oil-in-water emulsion cosmetic of the present invention preferably contains, as component (A2), one or more selected from the group consisting of ester oils and silicone oils, and more preferably contains one or more selected from the group consisting of esters represented by general formula (1), esters represented by general formula (3), esters represented by general formula (4), and dimethylpolysiloxanes, and is particularly preferred for use in the oil-in-water emulsion cosmetic of the present invention. The oil-in-water emulsion cosmetic of the present invention is particularly preferred for use in the oil-in-water emulsion cosmetic of the present invention. The oil-in-water emulsion cosmetic of the present invention is particularly preferred for use in the oil-in-water emulsion cosmetic of the present invention. 2More preferred are those containing one or more selected from the group consisting of dimethylpolysiloxanes having a kinematic viscosity of 5,000 mm / s or less, and include cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, 2-octyldodecyl myristate, isopropyl palmitate, glyceryl tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, alkyl benzoate (C12-15), and those having a kinematic viscosity of 5,000 mm / s or less. 2 More preferably, the composition contains one or more selected from the group consisting of dimethylpolysiloxanes having a kinematic viscosity of 5,000 mm / s or less, glyceryl tri-2-ethylhexanoate, diisopropyl sebacate, alkyl benzoate (C12-15), and 2 Particularly preferred is one containing one or more dimethylpolysiloxanes having a viscosity of 1 / s or less.

[0034] The content of component (A2) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 5% by mass or more, more preferably 7% by mass or more, and even more preferably 10% by mass or more, from the viewpoint of emulsion stability, freshness, and abrasion resistance, and is preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, and even more preferably 17% by mass or less. Specifically, it is preferably 5 to 30% by mass, more preferably 7 to 25% by mass, even more preferably 10 to 20% by mass, and even more preferably 10 to 17% by mass.

[0035] When the oil-in-water emulsion cosmetic of the present invention contains one or more oils selected from the group consisting of ester oils and silicone oils as component (A2), the total content of the one or more oils selected from the group consisting of ester oils and silicone oils in the total amount of component (A2) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 93% by mass or more, and is preferably 100% by mass or less.

[0036] The mass ratio [(A2) / (A1)] of the content of component (A2) to the content of component (A1) in the total amount of the oil-in-water emulsion cosmetic of the present invention (hereinafter also referred to as the "content mass ratio [(A2) / (A1)]") is preferably 1 or more, more preferably 2 or more, even more preferably 3 or more, still more preferably 4 or more, and even more preferably 5 or more, from the viewpoints of emulsion stability, freshness, and abrasion resistance; and from the viewpoints of UV protection effect and abrasion resistance, it is preferably 20 or less, more preferably 15 or less, even more preferably 10 or less, and even more preferably 8 or less. Specifically, it is preferably 1 to 20, more preferably 2 to 15, even more preferably 3 to 10, still more preferably 4 to 10, still more preferably 4 to 8, and even more preferably 5 to 8.

[0037] <Component (B): (meth)acrylamide polymer> The oil-in-water emulsion cosmetic of the present invention contains a (meth)acrylamide polymer as component (B). The inclusion of component (B) improves the stability of the emulsion. Note that (meth)acrylamide is a general term for acrylamide and methacrylamide. The (meth)acrylamide polymer may be any polymer having a repeating unit derived from (meth)acrylamide or a derivative thereof, and is a concept that encompasses, for example, polyacrylamide, polymethacrylamide, poly(acrylamide derivatives), poly(methacrylamide derivatives), copolymers of (meth)acrylamide and (meth)acrylamide derivatives, and copolymers of one or more monomers selected from acrylamide, methacrylamide, acrylamide derivatives, and methacrylamide derivatives with other monomers (for example, (meth)acrylic acid, (meth)acrylate salts, (meth)acrylates, vinylpyrrolidone, etc.). Furthermore, the (meth)acrylamide polymer is preferably water-soluble. Here, the (meth)acrylamide derivative is preferably an N-substituted (meth)acrylamide. For example, (meth)acryloyldimethyltaurine or a salt thereof can be mentioned. Examples of (meth)acryloyldimethyltaurine salts include alkali metal salts such as sodium salt, potassium salt, and lithium salt; salts with Group 2 elements such as calcium salt and magnesium salt; and ammonium salt.

[0038] As the (meth)acrylamide polymer, from the viewpoint of emulsion stability and abrasion resistance, a polymer having one or more repeating units selected from a repeating unit derived from (meth)acrylamide and a repeating unit derived from (meth)acryloyldimethyltaurine or a salt thereof is preferred. For example, poly(meth)acrylamide, a copolymer of hydroxyethyl (meth)acrylate and (meth)acryloyldimethyltaurine salt, a copolymer of (meth)acrylate and (meth)acryloyldimethyltaurine salt, a copolymer of (meth)acrylamide and (meth)acrylate salt, a copolymer of (meth)acrylic acid, (meth)acrylic acid amide, (meth)acrylate and (meth)acryloyldimethyltaurine salt, a copolymer of (meth)acrylamide and (meth)acrylate salt, a copolymer of (meth)acrylic acid, (meth)acrylic acid amide, (meth)acrylate and (meth)acryloyldimethyltaurine salt, a copolymer of (meth)acryloyldimethyltaurine salt and vinylpyrrolidone, a copolymer of (meth)acrylic acid amide and (meth)acryloyldimethyltaurine salt, a copolymer of (meth)acrylamide and (meth)acrylate ... Examples thereof include a copolymer of (meth)acrylic acid, a (meth)acrylic acid amide, and a (meth)acryloyldimethyl taurine salt, a copolymer of a (meth)acryloyldimethyl taurine salt and dimethyl(meth)acrylamide, a copolymer of a (meth)acryloyldimethyl taurine salt and vinyl formamide, and a copolymer of a (meth)acryloyldimethyl taurine salt and a polyoxyethylene alkyl ester of (meth)acrylic acid (average number of moles of ethylene oxide added: 10 to 30). Among these, from the viewpoints of emulsion stability and abrasion resistance, poly(meth)acrylamide, a copolymer of hydroxyethyl (meth)acrylate and (meth)acryloyldimethyl taurine salt, a copolymer of a (meth)acrylate and a (meth)acryloyldimethyl taurine salt, and a copolymer of a (meth)acryloyldimethyl taurine salt and vinylpyrrolidone are preferred, and a copolymer of a (meth)acrylate and a (meth)acryloyldimethyl taurine salt is more preferred.

[0039] More specific examples of (meth)acrylamide-based polymers include polyacrylamide, (Sodium acryloyldimethyltaurate / hydroxyethyl acrylate) copolymer (INCI name: Hydroxyethyl Acrylate / Sodium Acryloyldimethyl Taurate Copolymer), (Sodium acryloyldimethyltaurate / Sodium acrylate) copolymer (INCI name: Sodium Acrylate / Sodium Acryloyldimethyl Taurate Copolymer), acryloyldimethyltaurate / Sodium acrylate / dimethylacrylamide) crosspolymer (INCI name: Sodium Acrylate / Acryloyldimethyltaurate / Dimethylacrylamide Crosspolymer), (Ammonium acryloyldimethyltaurate / Vinylpyrrolidone) copolymer (INCI name: Ammonium Acryloyldimethyltaurate / VP Copolymer), (Sodium Acryloyldimethyltaurate / Acrylic Acid / Acrylamide / Sodium Acrylate) Copolymer (INCI name: Polyacrylate-13), (Ammonium Acryloyldimethyltaurate / Dimethylacrylamide / Lauryl Methacrylate / Laureth-4 Methacrylate) Crosspolymer (INCI name: Polyacrylate Crosspolymer-6), (Ammonium Acryloyldimethyltaurate / Beheneth-25 Methacrylate) Crosspolymer (INCI name: Ammonium Acryloyldimethyltaurate / Beheneth-25 Methacrylate Crosspolymer), (Ammonium Acryloyldimethyltaurate / Steareth-25 Methacrylate Crosspolymer) and others.

[0040] Commercially available products containing ingredient (B) include "SEPIGEL 501" (polyacrylamide, polysorbate 85, mineral oil, isoparaffin), "SEPIGEL 305" (polyacrylamide, hydrogenated polyisobutene (or (C13,14) isoparaffin), laureth-7, water), "SIMULGEL EG" ((Sodium acryloyldimethyltaurate / sodium acrylate) copolymer, isohexadecane, polysorbate 80), "SEPIMAX ZEN" ((ammonium acryloyldimethyltaurate / dimethylacrylamide / lauryl methacrylate / laureth-4 methacrylate) crosspolymer), "SEPINOV EMT 10" ((Sodium acryloyldimethyltaurate / hydroxyethyl acrylate) copolymer, sorbitan isostearate, polysorbate 60), and "SIMULGEL NS" ((Sodium acryloyldimethyltaurate / hydroxyethyl acrylate) copolymer, squalane, polysorbate 60, water), "SIMULGEL FL" ((Sodium acryloyldimethyltaurate / hydroxyethyl acrylate) copolymer, isohexadecane, polysorbate 60, water), "SEPIPLUS S" ((Sodium acryloyldimethyltaurate / hydroxyethyl acrylate) copolymer, polyisobutene, PEG-7 trimethylolpropane coconut oil alkyl ether, water), "SEPIPLUS 265" (a mixture of (acrylamide / ammonium acrylate) copolymer, polyisobutene, polysorbate 20, and water), "SEPIPLUS 400" ((Sodium acryloyldimethyltaurate / acrylic acid / acrylamide / sodium acrylate) copolymer, polyisobutene, polysorbate 20, water) (all manufactured by SEPPIC); "Aristoflex" Examples of such surfactants include "AVC" ((Ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, t-butanol, water), "Aristoflex HMB" ((Ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, t-butanol, water), and "Aristoflex HMS" ((Ammonium acryloyldimethyltaurate / steareth-25 methacrylate) crosspolymer) (all manufactured by Clariant).

[0041] The (meth)acrylamide polymers may be used alone or in combination of two or more.

[0042] The content of component (B) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoints of emulsion stability and abrasion resistance, and is preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1.5% by mass or less, and even more preferably 1% by mass or less, from the viewpoints of emulsion stability and abrasion resistance. Specifically, it is preferably 0.1 to 3% by mass, more preferably 0.3 to 2% by mass, even more preferably 0.3 to 1.5% by mass, even more preferably 0.5 to 1.5% by mass, and even more preferably 0.5 to 1% by mass.

[0043] <Component (C): Hydrophobically treated fine particle metal oxide> The oil-in-water emulsion cosmetic of the present invention contains a hydrophobically treated fine particle metal oxide as component (C), which improves the ultraviolet protection effect. From the viewpoint of improving the ultraviolet protection effect, the fine particle metal oxide of component (C) is preferably one or more selected from the group consisting of fine particle zinc oxide, fine particle titanium oxide, fine particle cerium oxide, fine particle iron oxide, and fine particle chromium oxide, more preferably one or more selected from the group consisting of fine particle zinc oxide, fine particle titanium oxide, and fine particle cerium oxide, and even more preferably one or more selected from the group consisting of fine particle zinc oxide and fine particle titanium oxide. Furthermore, these fine particle metal oxides can contain divalent or higher metals, and metals such as iron, zirconium, calcium, manganese, magnesium, and yttrium or oxides thereof can be contained in the fine particle metal oxide, either alone or in appropriate combinations of two or more.

[0044] Examples of hydrophobic treatments for component (C) include silicone treatment, alkylalkoxysilane treatment, fatty acid treatment, fluorine-containing compound treatment such as perfluoroalkyl phosphate esters and perfluoroalcohols, amino acid treatment such as N-acyl glutamic acid, lecithin treatment, metal soap treatment, alkyl phosphate ester treatment, and ASI treatment using N-acyl amino acid metal salts (sodium lauroyl aspartate), zinc chloride, and alkoxytitanium alkylate (isopropyl titanium triisostearate). These surface treatments may be used alone or in combination of two or more. Among these, the hydrophobic treatment of component (C) is preferably one or more treatments selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment, from the viewpoints of increasing the dispersibility of component (C) in the oil-in-water emulsion cosmetic, improving the UV protection effect and the stability of the emulsified state, and improving the freshness.

[0045] Examples of surface treatment agents used in silicone treatment include various silicone oils such as methylpolysiloxane, dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer (hydrogendimethicone), methylcyclopolysiloxane, dodecamethylcyclohexasiloxane, tetradecamethylhexasiloxane, dimethylsiloxane / methyl(polyoxyethylene)siloxane / methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane / methyl(polyoxyethylene)siloxane copolymer, dimethylsiloxane / methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane / methylcetyloxysiloxane copolymer, dimethylsiloxane / methylstearoxysiloxane copolymer, and (alkyl acrylate / dimethicone) copolymer. Among these, the surface treatment agent used for silicone treatment is preferably dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane, or dimethylsiloxane / methylhydrogensiloxane copolymer (hydrogen dimethicone), from the viewpoints of increasing the dispersibility of component (C) in the oil-in-water emulsion cosmetic, improving the UV protection effect and the stability of the emulsified state, and providing a good sense of freshness.

[0046] From the viewpoints of increasing the dispersibility of component (C) in the oil-in-water emulsion cosmetic, improving the UV protection effect and the stability of the emulsified state, and providing a good sense of freshness, the surface treatment agent used in the alkylalkoxysilane treatment is preferably an alkylalkoxysilane having a linear or branched alkyl group having from 6 to 20 carbon atoms, more preferably octyltriethoxysilane (triethoxycaprylylsilane) or octyltrimethoxysilane (trimethoxycaprylylsilane), and even more preferably octyltriethoxysilane (triethoxycaprylylsilane).

[0047] Examples of surface treatment agents used in the fatty acid treatment include linear or branched higher fatty acids having from 12 to 22 carbon atoms. Among these, the surface treatment agent used in the fatty acid treatment is preferably a linear or branched higher fatty acid having from 14 to 22 carbon atoms, more preferably a linear or branched higher fatty acid having from 16 to 20 carbon atoms, and even more preferably stearic acid or isostearic acid, from the viewpoints of increasing the dispersibility of component (C) in the oil-in-water emulsion cosmetic, improving the UV protection effect and the stability of the emulsified state, and providing a good sense of freshness.

[0048] Among the above-mentioned hydrophobization treatments for component (C), from the viewpoints of increasing the dispersibility of component (C) in oil-in-water emulsion cosmetics, improving the UV protection effect and the stability of the emulsified state, and providing a good sense of moisture, preferred is a hydrophobization treatment that uses one or more surface treatment agents selected from the group consisting of dimethylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer, alkylalkoxysilane, and fatty acid, and more preferred is a hydrophobization treatment that uses one or more surface treatment agents selected from the group consisting of dimethylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer, alkylalkoxysilane having a linear or branched alkyl group having from 6 to 20 carbon atoms, and linear or branched higher fatty acid having from 14 to 22 carbon atoms.

[0049] The above-mentioned surface treatment agents may be used alone or in combination of two or more. When titanium oxide is used as the metal oxide of component (C), from the viewpoint of reducing photocatalytic activity, a treatment agent such as silica, hydrous silica, or a hydrous oxide of a metal such as aluminum may be used in combination with the surface treatment agent used for the hydrophobic treatment described above.

[0050] The amount of hydrophobization treatment for component (C) is preferably 0.1% by mass or more, and preferably 40% by mass or less, more preferably 30% by mass or less, of the total amount of component (C), from the viewpoints of increasing the dispersibility of component (C) in the oil-in-water emulsion cosmetic, improving the UV protection effect and the stability of the emulsified state, and improving the freshness. In the present invention, the mass of component (C) and the average primary particle size described below mean the mass and average primary particle size including the surface treatment agent.

[0051] The shape of component (C) may be, for example, spherical, flake, plate, rod, spindle, needle, or irregular, but any shape can be used. From the viewpoint of improving the UV protection effect and the stability of the emulsion state, the average primary particle diameter of component (C) is preferably 1 μm or less, more preferably 800 nm or less, even more preferably 500 nm or less, even more preferably 300 nm or less, even more preferably 200 nm or less, even more preferably 100 nm or less, even more preferably 90 nm or less, even more preferably 50 nm or less, and even more preferably 40 nm or less, and from the viewpoint of versatility, it is preferably 1 nm or more, more preferably 5 nm or more, and even more preferably 10 nm or more. Specifically, from the same viewpoints as above, the average primary particle diameter of component (C) is preferably 1 nm to 1 μm, more preferably 1 to 800 nm, even more preferably 5 to 500 nm, even more preferably 5 to 300 nm, even more preferably 5 to 200 nm, even more preferably 5 to 100 nm, even more preferably 5 to 90 nm, even more preferably 5 to 50 nm, even more preferably 10 to 50 nm, and even more preferably 10 to 40 nm.

[0052] The average primary particle size of component (C) in the present invention can be determined from an image observed with a transmission electron microscope (TEM). Specifically, the average primary particle size is determined by observing the particles with a TEM at a magnification of 50,000x, measuring the maximum minor axis of 300 primary particles in the observed image, and calculating the number average value. Here, the maximum minor axis refers to the longest minor axis among the minor axes perpendicular to the major axis when component (C) has a shape other than a flaky or plate-like shape. Furthermore, when component (C) has a flaky or plate-like shape, the average primary particle size is determined by measuring the thickness of 300 primary particles in the observed image observed under the same conditions as above and calculating the number average value. Specifically, the average primary particle size is determined by the method described in the examples.

[0053] Component (C) can be prepared by surface-treating a fine metal oxide particle before hydrophobization with the aforementioned surface treatment agent. The surface treatment can be performed by any known method. For example, as described in Japanese Patent No. 3187440, a surface treatment using silicone oil can be performed by coating a fine metal oxide particle, such as fine zinc oxide particle, with at least one silicone compound (excluding silane compounds) composed of organopolysiloxanes and silicone resins in a non-gas phase, followed by baking at a temperature of 600 to 950°C in an oxygen-containing atmosphere to coat the surface of the fine metal oxide particle with silicon oxide. Furthermore, as described in Japanese Patent Publication No. 2007-326902, a surface treatment using alkylalkoxysilane can be performed by coating a fine metal oxide particle with a specific polysiloxane compound, followed by surface treatment with alkylalkoxysilane in water. The preferred embodiment and measurement method for the average primary particle size of the fine particle metal oxide before the hydrophobization treatment are the same as the preferred embodiment and measurement method for component (C).

[0054] Commercially available products of hydrophobically treated zinc oxide particles include the FINEX series (manufactured by Sakai Chemical Industry Co., Ltd.), the MZ series, and the MZY series (all manufactured by Teika Corporation). Commercially available hydrophobically treated titanium dioxide particles include the STR series (manufactured by Sakai Chemical Industry Co., Ltd.), TTO-55 series, TTO-51 series (all manufactured by Ishihara Sangyo Kaisha, Ltd.), MT series, and MTY series (all manufactured by Teika Corporation).

[0055] The content of component (C) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 1% by mass or more, more preferably 3% by mass or more, even more preferably 7% by mass or more, and even more preferably 10% by mass or more, from the viewpoints of emulsion stability, UV protection effect, and abrasion resistance, and is preferably 30% by mass or less, more preferably 27% by mass or less, even more preferably 25% by mass or less, and even more preferably 20% by mass or less, from the viewpoints of emulsion stability, UV protection effect, abrasion resistance, and abrasion resistance. Specifically, from the viewpoints of emulsion stability, UV protection effect, abrasion resistance, and abrasion resistance, it is preferably 1 to 30% by mass, more preferably 3 to 30% by mass, even more preferably 7 to 27% by mass, even more preferably 7 to 25% by mass, even more preferably 10 to 25% by mass, and even more preferably 10 to 20% by mass.

[0056] The mass ratio [(C) / (A1+A2)] of the content of component (C) to the combined content of components (A1) and (A2) in the total amount of the oil-in-water emulsion cosmetic of the present invention (hereinafter also referred to as "content mass ratio [(C) / (A1+A2)]") is, from the viewpoints of emulsion stability, UV protection effect, moisture, and abrasion resistance, preferably 0.1 or more, more preferably 0.15 or more, even more preferably 0.25 or more, still more preferably 0.3 or more, still more preferably 0.4 or more, still more preferably 0.5 or more, and still more preferably 0.6 or more; and, from the viewpoints of emulsion stability, UV protection effect, moisture, and abrasion resistance, it is preferably 2.5 or less, more preferably 2 or less, even more preferably 1.8 or less, still more preferably 1.5 or less, still more preferably 1.3 or less, and still more preferably 1.2 or less. Specifically, it is preferably 0.1 to 2.5, more preferably 0.15 to 2, even more preferably 0.25 to 1.8, still more preferably 0.3 to 1.5, even more preferably 0.4 to 1.3, even more preferably 0.5 to 1.2, and still more preferably 0.6 to 1.2. When the content mass ratio [(C) / (A1+A2)] is 0.25 to 1.8, the emulsion stability, UV protection effect, moisture, and abrasion resistance are particularly improved. Furthermore, even when the contents of 2-ethylhexyl paramethoxycinnamate and octocrylene are reduced, excellent UV protection effect is obtained.

[0057] <Component (D): Water-insoluble (meth)acrylic acid ester homopolymer> The water-insoluble (meth)acrylic acid ester homopolymer refers to a water-insoluble polymer consisting of one or more repeating structural units derived from (meth)acrylic acid ester. Note that (meth)acrylic acid ester is a general term for acrylic acid ester and methacrylic acid ester. The fatty acid residue in the (meth)acrylic acid ester is preferably a linear or branched saturated fatty acid residue, and the number of carbon atoms in the fatty acid residue is preferably 8 to 32, more preferably 10 to 30, from the viewpoints of emulsion stability, UV protection effect, freshness, and abrasion resistance. The (meth)acrylic acid ester is preferably a (meth)acrylic acid alkyl ester, such as decyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, or behenyl (meth)acrylate. Among these, from the viewpoints of emulsion stability, UV protection effect, freshness, and abrasion resistance, stearyl (meth)acrylate and behenyl (meth)acrylate are preferred, and a combination of stearyl (meth)acrylate and behenyl (meth)acrylate is more preferred.

[0058] Commercially available products of component (D) include "TEGO SP 13-1" (stearyl-modified acrylate homopolymer), "TEGO SP 13-6" (behenyl-modified acrylate homopolymer), and "TEGO SP 13 SUN UP" (stearyl- and behenyl-modified acrylate homopolymer) (all manufactured by Evonik).

[0059] The water-insoluble (meth)acrylic acid ester homopolymers may be used alone or in combination of two or more.

[0060] The content of component (D) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more, from the viewpoint of friction resistance, and is preferably 5% by mass or less, more preferably 2% by mass or less, even more preferably 0.9% by mass or less, and even more preferably 0.7% by mass or less, from the viewpoint of freshness. Specifically, from the viewpoints of freshness and friction resistance, the content is preferably 0.05 to 5% by mass, more preferably 0.1 to 2% by mass, even more preferably 0.2 to 0.9% by mass, even more preferably 0.3 to 0.9% by mass, and even more preferably 0.3 to 0.7% by mass. When the content of component (D) is 0.2 to 0.9 mass % or 0.3 to 0.7 mass %, the freshness and abrasion resistance are particularly improved.

[0061] The mass ratio of the content of component (D) to the combined content of components (A1) and (A2) in the total amount of the oil-in-water emulsion cosmetic of the present invention [(D) / (A1+A2)]] (hereinafter also referred to as "content mass ratio [(D) / (A1+A2)]") is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.015 or more, still more preferably 0.02 or more, and even more preferably 0.025 or more, from the viewpoint of friction resistance; and is preferably 0.3 or less, more preferably 0.15 or less, even more preferably 0.05 or less, and even more preferably 0.04 or less, from the viewpoint of freshness. Specifically, it is preferably 0.005 to 0.3, more preferably 0.01 to 0.15, even more preferably 0.015 to 0.05, still more preferably 0.02 to 0.05, and even more preferably 0.025 to 0.04. When the content mass ratio [(D) / (A1+A2)] is set to 0.015 to 0.05, the freshness and abrasion resistance are particularly improved.

[0062] The water content of the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, and is preferably 75% by mass or less, more preferably 70% by mass or less, even more preferably 65% ​​by mass or less. Specifically, it is preferably 40 to 75% by mass, more preferably 50 to 70% by mass, even more preferably 60 to 65% by mass.

[0063] In addition to the above-mentioned components, the oil-in-water emulsion cosmetic of the present invention preferably further contains one or more components selected from component (E): a polyhydric alcohol, component (F): a surfactant, component (G): another water-soluble polymer, and component (H): an aqueous medium (excluding component (E) and water).

[0064] <Component (E): Polyhydric alcohol> From the viewpoint of freshness and friction resistance, the oil-in-water emulsion cosmetic of the present invention preferably further contains a polyhydric alcohol as component (E). Examples of component (E) include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, polypropylene glycol (average molecular weight less than 650), isoprene glycol, and 1,3-butylene glycol; and trihydric or higher polyhydric alcohols such as glycerin, diglycerin, and polyglycerin. Among these, from the viewpoint of freshness and abrasion resistance, component (E) is preferably a polyhydric alcohol having from 2 to 12 carbon atoms, more preferably a polyhydric alcohol having from 2 to 6 carbon atoms, even more preferably a dihydric to trihydric alcohol having from 2 to 6 carbon atoms, still more preferably one or more selected from the group consisting of ethylene glycol, diethylene glycol, 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, 1,3-butylene glycol, and glycerin, even more preferably one or more selected from the group consisting of propanediol, dipropylene glycol, 1,3-butylene glycol, and glycerin, and even more preferably one or more selected from the group consisting of dipropylene glycol, 1,3-butylene glycol, and glycerin. These polyhydric alcohols can be used alone or in combination of two or more.

[0065] From the viewpoints of freshness and abrasion resistance, the content of component (E) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, still more preferably 1.5% by mass or more, even more preferably 2% by mass or more, and even more preferably 3% by mass or more, and from the viewpoints of freshness and abrasion resistance, it is preferably 15% by mass or less, more preferably 13% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, even more preferably 6% by mass or less, and even more preferably 5% by mass or less. Specifically, it is preferably 0 to 15% by mass, more preferably 0.5 to 13% by mass, even more preferably 1 to 10% by mass, even more preferably 1.5 to 8% by mass, even more preferably 2 to 6% by mass, and even more preferably 3 to 5% by mass.

[0066] <Component (F): Surfactant> From the viewpoint of obtaining good emulsion stability, the oil-in-water emulsion cosmetic of the present invention preferably further contains a surfactant as component (F). Component (F) may be any of nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants, which may be used singly or in combination of two or more.

[0067] Among these, component (F) is preferably a nonionic surfactant, such as sorbitan fatty acid ester, polyoxyalkylene hydrogenated castor oil, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkyl ether, polyether-modified silicone, etc. Specific examples include sorbitan monostearate, sorbitan monoisostearate, polyoxyethylene hydrogenated castor oil (average EO addition moles: 60), polyoxyethylene hydrogenated castor oil (average EO addition moles: 40), polyoxyethylene sorbitan monolaurate (average EO addition moles: 20), polyoxyethylene sorbitan monostearate (average EO addition moles: 20), polyoxyethylene sorbitan oleate (average EO addition moles: 20), polyoxyethylene (average EO addition moles: 7) lauryl ether, polyoxyethylene (average EO addition moles: 7) trimethylolpropane coconut oil alkyl ether, dimethicone copolyol, etc. These nonionic surfactants may be used alone or in combination of two or more.

[0068] The content of component (F) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.4% by mass or more, and is preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less. Specifically, it is preferably 0.1 to 3% by mass, more preferably 0.2 to 2% by mass, even more preferably 0.4 to 1% by mass.

[0069] <Component (G): Other water-soluble polymers> From the viewpoint of obtaining good emulsion stability, the oil-in-water emulsion cosmetic of the present invention preferably further contains a water-soluble polymer other than component (B) as component (G). Component (G) is not limited as long as it is one that is commonly used in cosmetics, and any of water-soluble natural polymers, water-soluble semi-synthetic polymers, and water-soluble synthetic polymers other than component (B) can be used.

[0070] Examples of water-soluble natural polymers include xanthan gum, carrageenan, and alginic acid. Examples of the water-soluble semi-synthetic polymer include modified polysaccharides such as hydroxycellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, hydroxymethyl cellulose, and cationized cellulose. Examples of water-soluble synthetic polymers other than component (B) include acrylic polymers other than component (B), such as carbomer (crosslinked polyacrylic acid), polyacrylic acid, sodium polyacrylate, and (acrylic acid / alkyl methacrylate) copolymers; polyvinylpyrrolidone, polyvinyl alcohol, and cationized polyvinylpyrrolidone.

[0071] Commercially available carbomer products include "Carbopol 910," "Carbopol 934," "Carbopol 940," "Carbopol 941," "Carbopol 980," and "Carbopol 981" (all manufactured by Lubrizol Advanced Materials). Commercially available (acrylic acid / alkyl methacrylate) copolymers include "Carbopol 1382," "Carbopol ETD2020," "PEMULEN TR-1," and "PEMULEN TR-2" (all manufactured by Lubrizol Advanced Materials).

[0072] The content of component (G) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.07% by mass or more, from the viewpoint of obtaining good emulsion stability, and is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less, from the viewpoint of obtaining a good feel in use. Specifically, it is preferably 0.01 to 5% by mass, more preferably 0.05 to 3% by mass, and even more preferably 0.07 to 1% by mass.

[0073] <Component (H): Aqueous medium (excluding component (E) and water)> The oil-in-water emulsion cosmetic of the present invention preferably contains component (E) and an aqueous medium other than water as component (H). Examples of component (H) include saturated monohydric alcohols having from 1 to 3 carbon atoms, such as ethanol, propyl alcohol, and isopropyl alcohol. The content of component (H) in the total amount of the oil-in-water emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 1% by mass or more, and is preferably 25% by mass or less, more preferably 15% by mass or less. Specifically, it is preferably 0.1 to 25% by mass, more preferably 1 to 15% by mass.

[0074] In addition to the above-mentioned components, the oil-in-water emulsion cosmetic of the present invention may contain optional components used depending on the intended use of the cosmetic, such as solid oils other than component (A1), sequestering agents, neutralizing agents, pH adjusters, disinfectants, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, physiologically active ingredients, salts, antioxidants, and fragrances.

[0075] The oil-in-water emulsion cosmetic of the present invention can be suitably used as hair cosmetics such as shampoos, rinses, conditioners, etc., and skin cosmetics such as facial cleansers, cleansing cosmetics, sunscreen cosmetics, packs, massage cosmetics, etc. Among these, the oil-in-water emulsion cosmetic of the present invention has excellent UV protection effect and is therefore particularly suitable for sunscreen applications such as sunscreen cosmetics (lotions, creams, emulsions, serums, etc.), suntans, makeup base cosmetics, foundations, etc. The oil-in-water emulsion cosmetic of the present invention can be applied in the form of a liquid, emulsion, cream, paste, solid, multi-layer, etc., and can also be applied as a sheet, spray, or mousse.

[0076] (Method of producing oil-in-water emulsion cosmetics) The method for producing the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and any known method can be used as appropriate depending on the formulation of the oil-in-water emulsion cosmetic. For example, there may be mentioned a method comprising the step of blending component (A1), component (A2), component (B), component (C), component (D), water, and, if necessary, other components, and mixing them uniformly using a homomixer or the like.

[0077] From the viewpoints of the stability of the emulsion state of the oil-in-water emulsion cosmetic, UV protection effect, freshness, and abrasion resistance of the oil-in-water emulsion cosmetic of the present invention, a method comprising the step of mixing and emulsifying a dispersion of component (C) dispersed in a mixture of component (A1), component (A2), and component (D) and, if necessary, other oil-soluble components, with a mixture of component (B), water, and, if necessary, other water-soluble components, is preferred, and a method comprising the following steps I to III is more preferred. Step I: A step of adding component (C) to a mixture of components (A1), (A2), and (D) and, if necessary, other oil-soluble components, and mixing them uniformly to obtain a dispersion (i) in which component (C) is dispersed. Step II: A step of uniformly mixing component (B), water, and, if necessary, other water-soluble components to obtain preparation (ii). Step III: A step of adding the dispersion (i) obtained in Step I to the preparation (ii) obtained in Step II, mixing uniformly, and emulsifying to obtain an oil-in-water emulsion cosmetic.

[0078] From the viewpoint of enhancing the dispersibility of component (C) in the oil-in-water emulsion cosmetic, Step I preferably includes the following Steps I-1 and I-2. Step I-1: A step of uniformly mixing component (A1), component (A2), component (D), and, if necessary, other oil-soluble components to obtain preparation (i'). Step I-2: A step of adding component (C) to the preparation (i') obtained in step I-1 and mixing them uniformly to obtain a dispersion (i) in which component (C) is dispersed.

[0079] Step I-1 and step II are preferably carried out while heating at a temperature in the range of 20°C or higher and 90°C or lower. After step II and prior to step III, it is preferable to cool the preparation (ii) to a temperature range of 15° C. or higher and 35° C. or lower, and then mix uniformly. In addition, step III is preferably a step of adding dispersion (i) obtained in step I while stirring preparation (ii) obtained in step II, preferably maintaining the temperature at 30°C or higher and 90°C or lower, and mixing and emulsifying the mixture uniformly.

[0080] In addition to the above-described embodiments, the present invention also discloses the following embodiments. <1> An oil-in-water emulsion cosmetic comprising the following components (A1), (A2), (B), (C) and (D): Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): (meth)acrylamide polymer Component (C): Hydrophobically treated fine particle metal oxide Component (D): Water-insoluble (meth)acrylic acid ester homopolymer

[0081] <2> the mass ratio [(D) / (A1+A2)] of the content of component (D) to the total content of component (A1) and component (A2) is 0.015 to 0.05; <1> The oil-in-water emulsion cosmetic according to claim 1. <3> Further containing component (E): polyhydric alcohol, <1> or <2> The oil-in-water emulsion cosmetic according to claim 1. <4> The content of component (E) in the oil-in-water emulsion cosmetic is 0.5 to 13% by mass. <3> The oil-in-water emulsion cosmetic according to claim 1. <5> The content of component (E) in the oil-in-water emulsion cosmetic is 1 to 10% by mass. <3> or <4> The oil-in-water emulsion cosmetic according to claim 1.

[0082] <6> The total content of 2-ethylhexyl paramethoxycinnamate and octocrylene in the oil-in-water emulsion cosmetic is 0 to 2% by mass. <1> ~ <5> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <7> The total content of 2-ethylhexyl paramethoxycinnamate and octocrylene in the oil-in-water emulsion cosmetic is 0 to 0.7% by mass. <1> ~ <6> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <8> the mass ratio of the content of component (C) to the total content of component (A1) and component (A2) [(C) / (A1+A2)] is 0.25 to 1.8; <1> ~ <7> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0083] <9> The fine particle metal oxide of component (C) is at least one selected from the group consisting of fine particle zinc oxide and fine particle titanium oxide. <1> ~ <8> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <10> The hydrophobic treatment of component (C) is one or more treatments selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment. <1> ~ <9> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <11> The hydrophobic treatment of component (C) is a hydrophobic treatment using one or more surface treatment agents selected from the group consisting of dimethylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer, alkylalkoxysilane, and fatty acid. <1> ~ <10> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <12> The average primary particle diameter of component (C) is 1 nm or more and 800 nm or less. <1> ~ <11> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <13> The average primary particle size of component (C) is 5 nm or more and 100 nm or less. <1> ~ <11> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0084] <14> The content of component (C) in the oil-in-water emulsion cosmetic is 3% by mass or more and 30% by mass or less. <1> ~ <13> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <15> The content of component (C) in the oil-in-water emulsion cosmetic is 7% by mass or more and 25% by mass or less. <1> ~ <14> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0085] <16> As component (D), a water-insoluble (meth)acrylic acid ester homopolymer having a fatty acid residue with 10 to 30 carbon atoms is contained. <1> ~ <15> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <17> Contains a water-insoluble (meth)acrylic acid alkyl ester homopolymer as component (D), <1> ~ <16> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <18> The content of component (D) in the oil-in-water emulsion cosmetic is 0.3% by mass or more and 0.9% by mass or less. <1> ~ <17> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <19> The content of component (D) in the oil-in-water emulsion cosmetic is 0.3% by mass or more and 0.7% by mass or less. <1> ~ <17> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0086] <20> The component (B) contains a polymer having one or more repeating units selected from a repeating unit derived from (meth)acrylamide and a repeating unit derived from (meth)acryloyldimethyltaurine or a salt thereof. <1> ~ <19> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <21> The content of component (B) in the oil-in-water emulsion cosmetic is 0.1% by mass or more and 3% by mass or less. <1> ~ <20> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <22> The content of component (B) in the oil-in-water emulsion cosmetic is 0.3% by mass or more and 2% by mass or less. <1> ~ <21> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <23> The component (A2) contains one or more oils selected from the group consisting of ester oils and silicone oils. <1> ~ <22> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0087] <24> The composition contains, as component (A1), one or more members selected from the group consisting of 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexylbenzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine; <1> ~ <23> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <25> It is a sunscreen cosmetic. <1> ~ <24> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0088] <26> An oil-in-water emulsion cosmetic comprising the following components (A1), (A2), (B), (C), (D), and (E): Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): A polymer having one or more repeating units selected from repeating units derived from (meth)acrylamide and repeating units derived from (meth)acryloyldimethyltaurine or a salt thereof. Component (C): One or more selected from the group consisting of hydrophobically treated fine zinc oxide particles and fine titanium oxide particles having an average primary particle diameter of 1 nm or more and 800 nm or less Component (D): Water-insoluble (meth)acrylic acid ester homopolymer Ingredient (E): Polyhydric alcohol the mass ratio of the content of component (C) to the total content of components (A1) and (A2) [(C) / (A1+A2)] is 0.25 to 1.8, the mass ratio of the content of component (D) to the total content of components (A1) and (A2) [(D) / (A1+A2)] is 0.015 to 0.05; the total content of 2-ethylhexyl paramethoxycinnamate and octocrylene is 0 to 2% by mass in the oil-in-water emulsion cosmetic; The content of component (E) in the oil-in-water emulsion cosmetic is 0.5 to 13% by mass. Oil-in-water emulsion cosmetic for sunscreen.

[0089] <27> An oil-in-water emulsion cosmetic comprising the following components (A1), (A2), (B), (C), (D), and (E): Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): A polymer having one or more repeating units selected from repeating units derived from (meth)acrylamide and repeating units derived from (meth)acryloyldimethyltaurine or a salt thereof. Component (C): One or more selected from the group consisting of hydrophobically treated fine zinc oxide particles and fine titanium oxide particles having an average primary particle diameter of 5 nm to 100 nm Component (D): Water-insoluble (meth)acrylic acid ester homopolymer Ingredient (E): Polyhydric alcohol the mass ratio of the content of component (C) to the total content of components (A1) and (A2) [(C) / (A1+A2)] is 0.4 to 1.3, the mass ratio of the content of component (D) to the total content of components (A1) and (A2) [(D) / (A1+A2)] is 0.015 to 0.05; the total content of 2-ethylhexyl paramethoxycinnamate and octocrylene is 0 to 2% by mass in the oil-in-water emulsion cosmetic; The content of component (E) in the oil-in-water emulsion cosmetic is 0.5 to 13% by mass. Oil-in-water emulsion cosmetic for sunscreen.

[0090] <28> An oil-in-water emulsion cosmetic comprising the following components (A1), (A2), (B), (C), (D), and (E): Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): A polymer having one or more repeating units selected from repeating units derived from (meth)acrylamide and repeating units derived from (meth)acryloyldimethyltaurine or a salt thereof. Component (C): One or more selected from the group consisting of hydrophobically treated fine zinc oxide particles and fine titanium oxide particles having an average primary particle diameter of 5 nm to 100 nm Component (D): Water-insoluble (meth)acrylic acid ester homopolymer Ingredient (E): Polyhydric alcohol the mass ratio of the content of component (C) to the total content of components (A1) and (A2) [(C) / (A1+A2)] is 0.4 to 1.3, the mass ratio of the content of component (D) to the total content of components (A1) and (A2) [(D) / (A1+A2)] is 0.015 to 0.05; the total content of 2-ethylhexyl paramethoxycinnamate and octocrylene is 0 to 2% by mass in the oil-in-water emulsion cosmetic; The hydrophobic treatment of component (C) is a hydrophobic treatment using one or more surface treatment agents selected from the group consisting of dimethylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer, alkylalkoxysilane, and fatty acid. Oil-in-water emulsion cosmetic for sunscreen.

[0091] <29> An oil-in-water emulsion cosmetic comprising the following components (A1), (A2), (B), (C), (D), and (E): Component (A1): A water-insoluble organic ultraviolet absorber that is solid at 25°C Ingredient (A2): Liquid oil Component (B): A polymer having one or more repeating units selected from repeating units derived from (meth)acrylamide and repeating units derived from (meth)acryloyldimethyltaurine or a salt thereof. Component (C): One or more selected from the group consisting of hydrophobically treated fine zinc oxide particles and fine titanium oxide particles having an average primary particle diameter of 5 nm to 100 nm Component (D): Water-insoluble (meth)acrylic acid ester homopolymer Ingredient (E): Polyhydric alcohol the mass ratio of the content of component (C) to the total content of components (A1) and (A2) [(C) / (A1+A2)] is 0.4 to 1.3, the mass ratio of the content of component (D) to the total content of components (A1) and (A2) [(D) / (A1+A2)] is 0.015 to 0.05; the total content of 2-ethylhexyl paramethoxycinnamate and octocrylene is 0 to 2% by mass in the oil-in-water emulsion cosmetic; the hydrophobization treatment of component (C) is a hydrophobization treatment using one or more surface treatment agents selected from the group consisting of dimethylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer, alkylalkoxysilane, and fatty acid; The content of component (E) in the oil-in-water emulsion cosmetic is 0.5 to 13% by mass. Oil-in-water emulsion cosmetic for sunscreen.

[0092] <30> The total content of 2-ethylhexyl paramethoxycinnamate and octocrylene in the oil-in-water emulsion cosmetic is 0 to 0.7% by mass. <26> ~ <29> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <31> The total content of 2-ethylhexyl paramethoxycinnamate and octocrylene in the oil-in-water emulsion cosmetic is 0 to 0.3% by mass. <26> ~ <29> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <32> The content of component (D) in the oil-in-water emulsion cosmetic is 0.3% by mass or more and 0.9% by mass or less. <26> ~ <31> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <33> The content of component (D) in the oil-in-water emulsion cosmetic is 0.3% by mass or more and 0.7% by mass or less. <26> ~ <32> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <34> The content of component (C) in the oil-in-water emulsion cosmetic is 3% by mass or more and 30% by mass or less. <26> ~ <33> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <35> The content of component (C) in the oil-in-water emulsion cosmetic is 7% by mass or more and 25% by mass or less. <26> ~ <33> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0093] <36> The content of component (B) in the oil-in-water emulsion cosmetic is 0.1% by mass or more and 3% by mass or less. <26> ~ <35> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <37> The content of component (B) in the oil-in-water emulsion cosmetic is 0.3% by mass or more and 2% by mass or less. <26> ~ <35> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0094] <38> The component (B) contains at least one selected from the group consisting of poly(meth)acrylamide, a copolymer of hydroxyethyl (meth)acrylate and a (meth)acryloyldimethyl taurine salt, a copolymer of a (meth)acrylate salt and a (meth)acryloyldimethyl taurine salt, and a copolymer of a (meth)acryloyldimethyl taurine salt and vinylpyrrolidone, <26> ~ <37> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <39> As component (D), a water-insoluble (meth)acrylic acid ester homopolymer having a fatty acid residue with 10 to 30 carbon atoms is contained. <26> ~ <38> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <40> Contains a water-insoluble (meth)acrylic acid alkyl ester homopolymer as component (D), <26> ~ <38> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is

[0095] <41> The component (A2) contains one or more oils selected from the group consisting of ester oils and silicone oils. <26> ~ <40> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is <42> The composition contains, as component (A1), one or more members selected from the group consisting of 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexylbenzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine; <26> ~ <41> 10. The oil-in-water emulsion cosmetic according to claim 9, wherein the oil-in-water emulsion cosmetic is [Example]

[0096] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[0097] Examples 1 to 32, Comparative Examples 1 to 10 According to the formulations shown in Tables 1 to 15, oil-in-water emulsion cosmetics were obtained by the following method. Specifically, components 1 to 20 and 30 to 35 shown in Tables 1 to 11 were uniformly mixed and dissolved by heating to 80°C to obtain preparation (i') (step I-1). Next, while maintaining the obtained preparation (i') at 80°C, components 23 to 29 shown in Tables 1 to 11 were added, mixed uniformly, and dispersed to obtain dispersion (i) (step I-2). Separately, components 21, 22, 36 to 45, 48, and 49 shown in Tables 1 to 11 were dissolved by heating to 40°C and allowed to cool naturally to 25°C. After that, components 46 and 47 were added and mixed uniformly to obtain preparation (ii) (Step II). While stirring the obtained preparation (ii), dispersion (i) maintained at 80°C was added, and the mixture was mixed uniformly using a homomixer and emulsified to obtain an oil-in-water emulsion cosmetic (Step III).

[0098] The obtained oil-in-water emulsion cosmetic was evaluated for (1) UV protection effect, (2) emulsification state, (3) feel upon use (freshness immediately after application), and (4) friction resistance, as shown below. As for the cosmetic preparation of Comparative Example 2, immediately after preparation it was in a non-uniform state, separated into an oil phase and an aqueous phase, and therefore only the emulsified state was evaluated, and no other evaluations were made. The results are shown in Tables 16 to 19.

[0099] (1) UV protection effect Each sample was applied to a PMMA plate at 1.3 mg / cm 2 The sample was applied evenly to the PMMA plate so that the sample was uniformly coated, and then allowed to dry naturally for 15 minutes. The PMMA plate was then irradiated with UV light from a fixed distance (10 mm). The transmitted UV light was detected at 10 points on the PMMA plate in the range of 290-400 nm using an SPF analyzer (Optometices), and the averaged spectrum was obtained to calculate the SPF value. The SPF value was also calculated in the same manner as above for Reference Example 1 (control) which did not contain an ultraviolet absorber, and the ultraviolet protection effect was relatively evaluated using this SPF value as the standard according to the following formula and evaluation criteria. SPF improvement rate (%) = (SPF value of Example or Comparative Example) / (SPF value of Control) × 100

[0100] [Evaluation criteria for UV protection effect] ◎:SPF improvement rate 250% or more 〇: SPF improvement rate is 150% or more but less than 250% △: SPF improvement rate is 100% or more but less than 150% ×: SPF improvement rate less than 100%

[0101] (2) Emulsified state Immediately after production, each oil-in-water emulsion cosmetic was observed under a microscope and evaluated according to the following criteria.

[0102] [Evaluation criteria for emulsification state] ◎: Component (C) penetrates into the internal phase (oil phase), the particle size distribution is very narrow in the range of 10 to 50 μm, and there is no coalescence of the emulsion particles, resulting in the formation of beautiful, roughly spherical emulsion particles. Visual observation reveals a glossy, beautiful appearance. ◯: Component (C) penetrates into the internal phase (oil phase), the emulsion particle size is in the range of 10 to 100 μm with a narrow particle size distribution, there is no coalescence of emulsion particles, and neat, roughly spherical emulsion particles are formed. Visual inspection reveals a clean appearance with no roughness. △: Component (C) penetrates into the internal phase (oil phase) and emulsified particles are formed, but the emulsified particles are uneven and coalescence occurs immediately after preparation or the day after preparation. Visual inspection also reveals a somewhat rough appearance. ×: Component (C) leaks into the external phase (aqueous phase), or emulsified particles are not formed, the oil phase and the aqueous phase are separated, and the appearance appears uneven even when observed visually.

[0103] (3) Sensation of use (freshness immediately after application) A use test was conducted on each of the oil-in-water emulsion cosmetics of the Examples and Comparative Examples by a panel of 10 experts in cosmetic evaluation. The freshness immediately after application was rated according to the following criteria, and the average score of the 10 panelists was calculated. The calculated average score was used to evaluate the cosmetics according to the following criteria.

[0104] [Grading criteria] 5 points: Good 4 points: Fairly good 3 points: Average 2 points: slightly poor 1 point: Defective

[0105] [Evaluation criteria for usability] ◎: More than 4 points 〇: More than 3 points but less than 4 points △: More than 2 points but less than 3 points ×: 2 points or less

[0106] (4) Friction resistance On a PMMA plate, 1.3 mg / cm 2 Each cosmetic was applied evenly so that the surface was smooth, and then allowed to dry naturally for 15 minutes. The SPF was then measured using an SPF analyzer (Labsphere UV-2000S, manufactured by Optometrics) (SPF before rubbing). Then, a friction tester (Tribomaster, Trinity-lab. Inc.) was used to measure the friction coefficient. 2 A 100g load was applied to the terminal with the cotton cloth attached, and the cosmetic-applied portion of the PMMA plate was rubbed. The SPF after rubbing was measured using the SPF analyzer (SPF after rubbing), and the SPF remaining rate was calculated using the formula below, and the rub resistance was evaluated according to the following criteria. The higher the SPF remaining rate, the higher the rub resistance. SPF residual rate (%) = ((SPF after friction) / (SPF before friction)) × 100

[0107] [Evaluation criteria for abrasion resistance] ◎: 100-71% Yes: 70-61% △:60-51% ×: 50% or less

[0108] [Table 1]

[0109] [Table 2]

[0110] [Table 3]

[0111] [Table 4]

[0112] [Table 5]

[0113] [Table 6]

[0114] Table 7

[0115] Table 8

[0116] Table 9

[0117] Table 10

[0118] Table 11

[0119] Table 12

[0120] Table 13

[0121] Table 14

[0122] Table 15

[0123] Table 16

[0124] Table 17

[0125] [Table 18]

[0126] [Table 19]

[0127] The symbols in the table indicate the following: *1: DSM "PARSOL 1789" *2: BASF "UVINUL A PLUS" *3: BASF "UVINUL T-150" *4: BASF "UVINUL M40" *5:Mosacare A440 manufactured by UFC CORPORATION *6: BASF "TINOSORB S" *7: "KF-96A-6cs" manufactured by Shin-Etsu Chemical Co., Ltd. *8: BASF "UVINUL MC80" *9: "AMS-C30 Cosmetic Wax" manufactured by Toray Dow Corning Co., Ltd. (a mixture of alkyl (C30-45) methicone: 54% by mass and olefin (C30-45): 46% by mass) *10: Prepared according to the description of Preparation Example 1 in JP 2021-155417 A *11: Prepared according to the description of Preparation Example 2 in JP 2021-155417 A *12: Prepared according to the description of Preparation Example 3 in JP 2021-155417 A *13: Prepared according to the description of Preparation Example 4 in JP 2021-155417 A *14: Sakai Chemical Industry Co., Ltd. "STR-100W-LP" (average primary particle diameter 10 nm) *15: Sakai Chemical Industry Co., Ltd. "STR-100W-OTS" (average primary particle diameter 10 nm) *16: "Fine particle titanium dioxide MT-N1" (average primary particle diameter 7 nm) manufactured by Teika Corporation *17: Evonik "TEGO SP 13-1" *18: Evonik "TEGO SP 13-6" *19: Chiba Flour Mills' "Leopard KL2" *20: Lubrizol's "Oilkemia 5S" *21: "EB-21" manufactured by Ajinomoto Co., Inc. *22: "SEPIGEL 305" manufactured by SEPPIC (a mixture of 40% by weight of polyacrylamide, 30% by weight of (C13,14) isoparaffin, 24% by weight of laureth-7, and 6% by weight of water; for example, in the cosmetic of Example 12, the content of component (A2) is 13.45 (= 13 + 1.5 × 30 / 100)% by weight, the content of component (B) is 0.6 (= 1.5 × 40 / 100)% by weight, and the content of component (F) is 0.86% by weight). *23: "SIMULGEL EG" manufactured by SEPPIC (a mixture of (sodium acrylate / sodium acryloyldimethyltaurate) copolymer: 37.5% by mass, isohexadecane: 22.5% by mass, polysorbate 80: 7.5% by mass, water: 30% by mass, and sorbitan oleate: 2.5% by mass; for example, in the cosmetic of Example 1, the content of component (A2) is 13.45 (= 13 + 2 × 22.5 / 100)% by mass, the content of component (B) is 0.75 (= 2 × 37.5 / 100)% by mass, and the content of component (F) is 0.7 (= 0.5 + 2 × 10 / 100)% by mass). *24: Seppic "SEPINOV EMT 10" (a mixture of 89.3% by mass of hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, sorbitan isostearate, and polysorbate 60) *25: Clariant's "Aristoflex AVC" ((acryloyldimethyltaurate ammonium / vinylpyrrolidone) copolymer, active ingredient 100% by mass) *26: Lubrizol "PEMULEN TR-1"

Claims

1. An oil-in-water emulsion cosmetic comprising the following components (A1), (A2), (B), (C), and (D): Component (A1): 0.7 to 10% by mass of a water-insoluble organic ultraviolet absorber that is solid at 25°C Component (A2): Liquid oil agent 10-30% by mass Component (B): (meth)acrylamide polymer 0.3 to 2% by mass Component (C): Hydrophobically treated fine particle metal oxide 3 to 30% by mass Component (D): Water-insoluble (meth)acrylic acid ester homopolymer 0.05 to 2% by mass

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the mass ratio [(D) / (A1+A2)] of the content of component (D) to the total content of component (A1) and component (A2) is 0.015 to 0.

05.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the mass ratio of the content of component (C) to the total content of component (A1) and component (A2) [(C) / (A1+A2)] is 0.25 to 1.

8.

4. An oil-in-water emulsion cosmetic according to any one of claims 1 to 3, wherein the total content of 2-ethylhexyl paramethoxycinnamate and octocrylene among component (A2) is 0 to 2 mass% in the oil-in-water emulsion cosmetic.

5. The oil-in-water emulsion cosmetic according to any one of claims 1 to 4, further comprising component (E): a polyhydric alcohol.

6. The oil-in-water emulsion cosmetic according to any one of claims 1 to 5, wherein the fine particle metal oxide of component (C) is at least one selected from the group consisting of fine particle zinc oxide and fine particle titanium oxide.

7. The oil-in-water emulsion cosmetic according to any one of claims 1 to 6, wherein the hydrophobic treatment of component (C) is one or more treatments selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment.

8. The oil-in-water emulsion cosmetic according to any one of claims 1 to 7, wherein the content of component (C) in the oil-in-water emulsion cosmetic is 3% by mass or more and 30% by mass or less.

9. The oil-in-water emulsion cosmetic according to any one of claims 1 to 8, comprising, as component (A2), one or more oils selected from the group consisting of ester oils and silicone oils.

10. 10. The oil-in-water emulsion cosmetic according to any one of claims 1 to 9, comprising, as component (A1), one or more members selected from the group consisting of 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexylbenzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine.

11. The oil-in-water emulsion cosmetic according to any one of claims 1 to 10, comprising, as component (B), a polymer having one or more repeating units selected from the group consisting of repeating units derived from (meth)acrylamide and repeating units derived from (meth)acryloyldimethyltaurine or a salt thereof.

12. The oil-in-water emulsion cosmetic according to any one of claims 1 to 11, which is a sunscreen cosmetic.

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