Oil-in-water cosmetic

Abstract

To provide a cosmetic which contains surface-treated solid particles having Pickering emulsifying ability and excellent handleability, and to which a fresh feeling of use is imparted.SOLUTION: An oil-in-water cosmetic comprising (A) a surface-treated fine particle metal oxide surface-treated with a hydrophobic treatment agent and a hydrophilic treatment agent, (B) water, and (C) an oil component, wherein the hydrophobic treatment agent comprises a hydrophobic silicon compound, the hydrophilic treatment agent comprises hydrous silica, and a ratio (MOIL / MWAT) of an amount of substance of the hydrophobic treatment agent (MOIL (mol)) to an amount of substance of the hydrophilic treatment agent (MWAT (mol)) is 0.090 or less.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Sunscreen cosmetics contain UV protection agents to impart a high SPF (Sun Protection Factor). For example, the use of organic UV absorbers, UV scattering agents, etc., can impair the feel of the cosmetics when applied. Furthermore, emulsion-type sunscreen cosmetics often contain surfactants, which can also impair the feel of the cosmetics when applied.

[0003] Therefore, in order to realize sunscreen cosmetics that have a high SPF and a refreshing feel when used, there is a demand for solid particles that can be "Pickering emulsified" without the addition of surfactants and that have a high SPF function.

[0004] In order to realize such particles, it is conceivable to modify the solid particles by subjecting them to a surface treatment.

[0005] Regarding the modification of solid particles, for example, Patent Document 1 describes a surface-treated powder in which the surface of spherical glass beads is treated with amino-modified silicone, and explains that cosmetics containing this surface-treated powder provide a feeling of softness, moisture, and adhesion when applied to the skin.

[0006] Furthermore, Patent Document 2 describes treating the surface of a base powder made of sericite, talc, titanium oxide, or the like with amino-modified silicone, and explains that cosmetics containing the resulting surface-treated powder have excellent spreadability, adhesion, and moisturizing properties. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2020-203842 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-182729 Summary of the Invention [Problem to be solved by the invention]

[0008] The Pickering emulsifiers used in the prior art did not have SPF functionality themselves and had to be combined with other UV protection agents.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cosmetic preparation that has a high SPF function and contains solid particles that can be emulsified by Pickering. [Means for solving the problem]

[0010] The present invention is as follows.

[0011] <<Aspect 1>> (A) Surface-treated fine particle metal oxide surface-treated with a hydrophobic treatment agent and a hydrophilic treatment agent, (B) water, and (C) Oil content An oil-in-water cosmetic comprising: the hydrophobic treatment agent contains a hydrophobic silicon compound, The hydrophilic treatment agent contains hydrated silica, and Amount of substance of hydrophilic treatment agent (M WAT (mol)) of the substance amount of the hydrophobic treatment agent (M OIL (mol)) ratio (M OIL / M WAT ) is 0.090 or less, Oil-in-water cosmetics. Aspect 2: The oil-in-water cosmetic according to Aspect 1, wherein the hydrophobic silicon compound is silicone. Aspect 3: The oil-in-water cosmetic according to Aspect 1, wherein the hydrophobic silicon compound is one or more compounds selected from the group consisting of amino-modified silicone represented by the following general formula (1), hydrogen dimethicone, and octyltriethoxycaprylylsilane: [ka] (In formula (1), R 1 is selected from divalent hydrocarbon groups having 1 to 8 carbon atoms; n is a number from 1 to 5, R 2 is selected from a hydroxyl group and a monovalent hydrocarbon group having 1 to 20 carbon atoms, R 3 represents a monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, a hydroxyl group, and a group R 1 -NH(CH2) n -NH2, a and b are each a number of 1 or more, and a+b is a number average value of 2 or more and less than 2,000, Multiple Rs 1 , R 2 , and R 3 may be the same or different groups, (SiR 2 2O) units and (SiR 2 (R 1 -NH(CH2) n The —NH2)O) units may be in block or random arrangement. Aspect 4: The oil-in-water cosmetic according to any one of Aspects 1 to 3, wherein the surface-treated fine particle metal oxide is surface-treated fine particle zinc oxide. Aspect 5: The oil-in-water cosmetic according to any one of Aspects 1 to 3, wherein the average primary particle size is less than 80 nm. Aspect 6: The oil-in-water cosmetic according to Aspect 4, wherein the average primary particle size is less than 80 nm. Aspect 7: The oil-in-water cosmetic according to any one of Aspects 1 to 3, wherein the hydrophobic silicon compound is one or two compounds selected from aminoethylaminopropylmethylsiloxanedimethylsiloxane copolymer and hydrogen dimethicone. Aspect 8: The oil-in-water cosmetic according to Aspect 4, wherein the hydrophobic silicon compound is one or two compounds selected from aminoethylaminopropylmethylsiloxane dimethylsiloxane copolymer and hydrogen dimethicone. Aspect 9: The ratio (M OIL / M WAT 4. The oil-in-water cosmetic according to any one of Aspects 1 to 3, wherein the (σ) is 0.0001 or greater. Aspect 10: The oil-in-water cosmetic according to any one of Aspects 1 to 3, wherein the hydrophobic treatment agent further comprises a fatty acid. Aspect 11: The oil-in-water cosmetic according to any one of Aspects 1 to 3, which is substantially free of a surfactant. Aspect 12: The oil-in-water cosmetic according to any one of Aspects 1 to 3, which is a sunscreen cosmetic. [Effects of the Invention]

[0012] The oil-in-water cosmetic of the present invention contains surface-treated solid particles that are easy to handle and is a cosmetic that has a fresh feel when used. The oil-in-water cosmetic of the present invention can be used, for example, as a sunscreen cosmetic. DETAILED DESCRIPTION OF THE INVENTION

[0013] The oil-in-water cosmetic of the present invention comprises: (A) a surface-treated fine particle metal oxide whose surface has been treated with a hydrophobic treatment agent and a hydrophilic treatment agent; (B) water, and (C) Oil content An oil-in-water cosmetic comprising: the hydrophobic treatment agent contains a hydrophobic silicon compound, The hydrophilic treatment agent contains hydrated silica, and Amount of substance of hydrophilic treatment agent (M WAT (mol)) of the substance amount of the hydrophobic treatment agent (MOIL (mol)) ratio ((M OIL ) / M WAT ) is 0.090 or less, It is an oil-in-water cosmetic.

[0014] The surface-treated metal oxide (A) contained in the oil-in-water cosmetic of the present invention has good Pickering emulsification ability. Therefore, the oil-in-water cosmetic of the present invention, which contains the surface-treated metal oxide (A) together with water (B) and oil (C), can be used as a good and stable emulsion cosmetic.

[0015] The oil-in-water cosmetic of the present invention may contain (A) surface-treated fine particle metal oxide, (B) water, and (C) oil, as well as optional components for enabling the oil-in-water cosmetic of the present invention to function as a cosmetic. When the oil-in-water cosmetic of the present invention is used, for example, as a sunscreen cosmetic, the optional components may be, for example, (D) an ultraviolet protection agent and (E) other components.

[0016] However, in the oil-in-water cosmetic of the present invention, the surface-treated metal oxide particulate (A) exhibits extremely good Pickering emulsification ability, so it does not need to contain substantially any surfactant. "Substantially containing no surfactant" means that the surfactant concentration in the cosmetic is low enough that the cosmetic is not emulsified by the surfactant. Specifically, for example, the surfactant concentration may be 1% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.1% by mass or less, 0.05% by mass or less, or 0.01% by mass or less, based on the total mass of the cosmetic, or the cosmetic may contain no surfactant at all.

[0017] Each component contained in the oil-in-water cosmetic composition of the present invention will be described below.

[0018] (A) Surface-treated fine metal oxide particles The surface-treated fine particle metal oxide (A) contained in the oil-in-water cosmetic of the present invention is a fine particle metal oxide whose surface has been treated with a hydrophobic treatment agent and a hydrophilic treatment agent.

[0019] <Hydrophobic treatment agent> In the present invention, the hydrophobic treatment agent used for the surface treatment of the fine particle metal oxide contains a hydrophobic silicon compound. The hydrophobic treatment agent may further contain a fatty acid together with the hydrophobic silicon compound. The hydrophobic treatment agent may or may not contain treatment agents other than these together with the hydrophobic silicon compound and the fatty acid.

[0020] -Hydrophobic silicon compounds- The hydrophobic silicon compound may be, for example, silicone. Examples of silicone include amino-modified silicone represented by the following general formula (1), hydrogen dimethicone, octyltriethoxycaprylylsilane, etc., and one or more selected from these may be used.

[0021] [ka]

[0022] (In formula (1), R 1 is selected from divalent hydrocarbon groups having 1 to 8 carbon atoms; n is a number from 1 to 5, R 2 is selected from a hydroxyl group and a monovalent hydrocarbon group having 1 to 20 carbon atoms, R 3 represents a monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, a hydroxyl group, and a group R 1 -NH(CH2) n -NH2, a and b are each a number of 1 or more, and a+b is a number average value of 2 or more and less than 2,000, Multiple Rs 1 , R 2 , and R 3 may be the same or different groups, (SiR 2 2O) units and (SiR 2 (R 1 -NH(CH2) nThe —NH2)O) units may be in block or random arrangement.

[0023] R in formula (1) 1 is a divalent hydrocarbon group having 1 to 8 carbon atoms. 1 The carbon number of the hydrocarbon group may be 2 to 6, and particularly 3 or 4. Specifically, R 1 may be, for example, a divalent group selected from a 1,2-propylene group, a 1,3-propylene group, an isobutylene group, a 2-methyl-1,3-propylene group, and the like.

[0024] R 2 R is a monovalent group selected from a hydroxyl group and a monovalent hydrocarbon group having 1 to 20 carbon atoms. 2 When R is a hydrocarbon group, the number of carbon atoms may be 1 to 12, 1 to 6, or 1 to 4. Specifically, R 2 may be, for example, a group selected from a methyl group and an ethyl group.

[0025] R 3 represents a monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, a hydroxyl group, and a group R 1 -NH(CH2) n R is a monovalent group selected from —NH 2 When is a hydrocarbon group or an alkoxyl group, the number of carbon atoms may be 1 to 12, 1 to 6, or 1 to 4. The hydrocarbon group may specifically be, for example, a group selected from a methyl group and an ethyl group, and the alkoxyl group may specifically be, for example, a group selected from a methoxyl group and an ethoxyl group.

[0026] In formula (1), a+b may be 20 or more, or 30 or more, and may be less than 1,000.

[0027] The amino equivalent of the amino-modified silicone may be 200 g / mol or more, 500 g / mol or more, or 600 g / mol or more, and may be 30,000 g / mol or less, 20,000 g / mol or less, 15,000 g / mol or less, 10,000 g / mol or less, or 5,000 g / mol or less. This amino equivalent is a value defined as the mass of the siloxane skeleton per amino group or ammonium group.

[0028] The viscosity of amino-modified silicone is the kinematic viscosity at 25°C, measured at 100 mm 2 / s or more, 200mm 2 / s or more, 300mm 2 / s or more, 500mm 2 / s or more, or 700 mm 2 / s or more, 3,000 mm 2 / s or less, 2,500mm 2 / s or less, 2,000mm 2 / s or less, 1,800mm 2 / s or less, 1,500mm 2 / s or less, or 1,300 mm 2 / s or less.

[0029] The amino-modified silicone in the present invention may be an aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer, known by the INCI (International Nomenclature of Cosmetic Ingredients) name "amodimethicone."

[0030] The hydrophobic silicon compound in the present invention may be one or two compounds selected from aminoethylaminopropylmethylsiloxane dimethylsiloxane copolymer and hydrogen dimethicone.

[0031] -fatty acid- In the present invention, the fatty acid optionally used in the surface treatment of the fine particle metal oxide may be, for example, a higher fatty acid, particularly a saturated higher fatty acid, and the hydrocarbon group portion of the fatty acid may be linear or branched.

[0032] The fatty acid may be a saturated fatty acid having 12 to 28 carbon atoms, and specifically may be, for example, lauric acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, arachidic acid, behenic acid, isobehenic acid, lignoceric acid, cerotic acid, montanic acid, etc., and may be one or more selected from these.

[0033] <Hydrophilic treatment agent> In the present invention, the hydrophilic treatment agent used for the surface treatment of the fine particle metal oxide contains hydrated silica. The hydrophilic treatment agent may or may not contain treatment agents other than hydrated silica.

[0034] Hydrous silica is a hydrate of silica that normally adsorbs 5 to 8% water by mass, and is known in the industry as having the chemical formula "SiO2·nH2O" or "SiO2·xH2O" (n and x vary depending on the manufacturing method).

[0035] 〈ratio((M OIL ) / M WAT )〉 In the surface-treated fine particle metal oxide used in the present invention, the amount of substance of the hydrophilic treatment agent (M WAT (mol)) to the amount of hydrophobic treatment agent (M OIL (mol)) ratio ((M OIL ) / M WAT From the viewpoint of imparting good Pickering emulsification ability to the obtained surface-treated fine particle metal oxide, the ratio ((M OIL ) / M WAT) may be 0.0001 or more, 0.0005 or more, 0.001 or more, 0.005 or more, or 0.010 or more.

[0036] Here, when the hydrophobic treatment agent is composed of only a hydrophobic silicon compound, the amount of substance of the hydrophobic treatment agent (M OIL (mol)) is equal to the amount of substance of this hydrophobic silicon compound. When the hydrophobic treatment agent is composed of a hydrophobic silicon compound and a fatty acid, the amount of substance of the hydrophobic treatment agent (M OIL (mol)) is equal to the sum of the amount of substance of the hydrophobic silicon compound and the amount of substance of the fatty acid.

[0037] In addition, when the hydrophilic treatment agent is composed only of hydrated silica, the substance amount of the hydrophilic treatment agent (M WAT (mol)) is equal to the amount of hydrous silica.

[0038] <Fine particle metal oxide> The fine particle metal oxide in the surface-treated fine particle metal oxide may be, for example, fine particle zinc oxide, fine particle iron oxide, fine particle titanium oxide, fine particle alumina, fine particle tin oxide, fine particle cerium oxide, etc., and may be one or more types selected from these.

[0039] The particulate metal oxide in the surface-treated particulate metal oxide may typically be particulate zinc oxide. Particulate zinc oxide exhibits an ultraviolet ray scattering effect, and therefore cosmetics containing this can be used, for example, as sunscreen cosmetics.

[0040] From the viewpoint of allowing the surface-treated fine particle metal oxide to exhibit good Pickering emulsifying ability and imparting a fresh feel to cosmetics containing the surface-treated fine particle metal oxide, the average primary particle diameter of the surface-treated fine particle metal oxide of the present invention may be less than 80 nm. The average primary particle diameter of the surface-treated fine particle metal oxide may be 60 nm or less, 50 nm or less, 40 nm or less, or 30 nm or less. On the other hand, from the viewpoint of ensuring the handleability of the surface-treated fine particle metal oxide, the average primary particle diameter may be 5 nm or more, 10 nm or more, 15 nm or more, or 20 nm or more.

[0041] 《(B)Water》 The oil-in-water cosmetic of the present invention contains (B) water.

[0042] 《(C) Oil》 The oil-in-water cosmetic of the present invention contains an oil component (C).

[0043] Examples of the oil (C) contained in the anhydrous cosmetic composition of the present invention include diisopropyl sebacate, isopropyl myristate, glyceryl tri-2-ethylhexanoate, cetyl 2-ethylhexanoate, tripropylene glycol dineopentanoate, isononyl isononanoate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, and sucralose. Isocetyl tearic acid, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythrityl tetra-2-ethylhexanoate, triethyl Hexanoin (Glyceryl Tri-2-Ethylhexanoate), Glyceryl Trioctanoate, Glyceryl Triisopalmitate, Trimethylolpropane Triisostearate, Cetyl 2-Ethylhexanoate, 2-Ethylhexyl Palmitate, Glyceryl Trimyristate, Tri-2-Heptylundecanoic Acid Glyceride, Castor Oil Fatty Acid Methyl Ester, Oleyl Oleate, Acetoglyceride, 2-Heptylundecyl Palmitate, Diisobutyl Adipate, N-Lauroyl-L-Glutamate-2-Octyldodecyl silyl esters, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, 2-ethylhexyl succinate, triethyl citrate, diisopropyl sebacate, olive oil, sunflower oil, camellia oil, soybean oil, jojoba oil, macadamia nut oil, meadowfoam oil, alkyl benzoate, dimethicone, caprylyl methicone, etc., and one or more selected from these may be used.

[0044] (D) UV protection agent The (D) UV protection agent contained in the oil-in-water cosmetic of the present invention may include, but is not limited to, aqueous UV protection agents and highly polar oil-based UV protection agents commonly used in cosmetics. Examples of UV protection agents include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, and other oil-based UV protection agents.

[0045] Specific examples and trade names of these oil-based UV protection agents are listed below, but the oil-based UV protection agents of the present invention are not limited to these.

[0046] Specific examples of the UV protection agent (D) in the oil-in-water cosmetic composition of the present invention include benzoic acid derivatives, such as para-aminobenzoic acid (PABA), ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA (e.g., "Escarol 507"; Ashland), glyceryl PABA, PEG-25-PABA (e.g., "Uvinal P25"; BASF), N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, and diethylaminohydroxybenzoylhexyl benzoate (e.g., "Uvinal A Plus"; BASF).

[0047] Examples of salicylic acid derivatives include amyl salicylate, menthyl salicylate, homosalate (homomenthyl salicylate) (e.g., Eusolex HMS; Rona / EM Industries), ethylhexyl salicylate (octyl salicylate) (e.g., NeoHeliopan OS; Herman & Reimer), dipropylene glycol salicylate (e.g., Dipsal; Skell), TEA salicylate (e.g., NeoHeliopan TS; Herman & Reimer), phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate.

[0048] Examples of cinnamic acid derivatives include octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate (diisopropyl methylcinnamate), propyl p-methoxycinnamate, isopropyl methoxycinnamate (isopropyl methoxycinnamate), isoamyl p-methoxycinnamate, octyl methoxycinnamate (ethylhexyl methoxycinnamate) (e.g., Parsol MCX; Hoffmann-La Roche), and isoamyl methoxycinnamate (e.g., Neo Heliopan E1000); Herman & Reimer), cinnoxate, DEA methoxycinnamate, 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-para-methoxycinnamate, 3,4,5-trimethoxycinnamate 3-methyl-4-[methylbis(trimethylsiloxy)silyl]butyl, glyceryl ethylhexanoate-dimethoxycinnamate, di-(2-ethylhexyl)-4'-methoxybenzalmalonate, etc.

[0049] Examples of dibenzoylmethane derivatives include 4-tert-butyl-4'-methoxydibenzoylmethane (eg, "Parsol 1789"; DSM).

[0050] Examples of β,β-diphenylacrylate derivatives include octocrylene (eg, "Uvinal N539"; BASF).

[0051] Examples of benzophenone derivatives include benzophenone-1 (e.g., "Uvinal 400"; BASF), benzophenone-2 (e.g., "Uvinal D50"; BASF), benzophenone-3 (oxybenzone) (e.g., "Uvinal M40"; BASF), benzophenone-4 (e.g., "Uvinal MS40"; BASF), benzophenone-5, benzophenone-6 (e.g., "Helisorb 11"; Norquay), benzophenone-8 (e.g., "Spectra-Sorb UV-24"; American Cyanamid), benzophenone-9 (e.g., "Uvinal DS-49"; BASF), and benzophenone-12.

[0052] Examples of benzylidene camphor derivatives include 3-benzylidene camphor (e.g., "Mexoryl SD"; Cimex), 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid (e.g., "Mexoryl SL"; Cimex), benzalkonium camphor methosulfate (e.g., "Mexoryl SO"; Cimex), terephthalidene discamphorsulfonic acid (e.g., "Mexoryl SX"; Cimex), and polyacrylamidomethyl benzylidene camphor (e.g., "Mexoryl SW"; Cimex).

[0053] Examples of phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid (e.g., "Eusolex 232"; Merck), disodium phenyldibenzimidazole tetrasulfonate (e.g., "Neo Heliopan AP"; Herman & Reimer), and the like.

[0054] Examples of triazine derivatives include anisotriazine (e.g., "Tinosorb S"; Ciba Specialty Chemicals), ethylhexyl triazone (e.g., "Uvinal T150"; BASF), diethylhexylbutamido triazone (e.g., "Uvasorb HEB"; Sigma 3V), and 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine.

[0055] Examples of phenylbenzotriazole derivatives include drometrizole trisiloxane (e.g., "Silatrizole"; Rhodia-Chemie), methylenebis(benzotriazolyltetramethylbutylphenol) (e.g., "Tinosorb M" (Ciba Specialty Chemicals)), 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, and 2-(2'-hydroxy-5'-methylphenylbenzotriazole).

[0056] Examples of anthranil derivatives include menthyl anthranilate (e.g., "Neo Heliopan MA"; Herman & Reimer).

[0057] Examples of imidazoline derivatives include ethylhexyldimethoxybenzylidene dioxoimidazoline propionate.

[0058] Examples of benzalmalonate derivatives include polyorganosiloxanes having benzalmalonate functional groups (for example, polysilicone-15; "Parsol SLX"; DSM Nutrition Japan).

[0059] Examples of 4,4-diarylbutadiene derivatives include 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene.

[0060] Other UV protection agents include, for example, dibenzalazine, dianisoylmethane, t-butyl methoxydibenzoylmethane (4-methoxy-4'-t-butyldibenzoylmethane), 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, bisethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, octocrylene, polysilicone-15, oxybenzone-3, methylene bisbenzotriazolyl tetramethylbutylphenol, 2-phenyl-5-methylbenzoxazole, and homomenthyl-N-acetylanthranilate. Examples include:

[0061] As the ultraviolet protection agent (D) contained in the oil-in-water cosmetic composition of the present invention, one or more selected from the above-exemplified agents may be used.

[0062] It should be noted that (A) the surface-treated fine particle metal oxide has an SPF function, and some of the fine particle metal oxides other than the component (A) (A') described below may also have an SPF function, but these do not fall under the category of (D) the ultraviolet protection agent contained in the oil-in-water cosmetic of the present invention.

[0063] (E) Other Ingredients The (E) other components in the oil-in-water cosmetic of the present invention may be, for example, alcohol, a moisturizer, a thickener, a pH adjuster, an active agent, a preservative, and the like.

[0064] The alcohol may be a lower alcohol having 1 to 6 carbon atoms. The number of carbon atoms of the alcohol may be 1 to 5 or 1 to 4. Specific examples of the alcohol in the present invention may include ethanol, propanol, butanol, etc. The number of carbon atoms of the alcohol may particularly be 1 to 3.

[0065] The moisturizer may be, for example, glycerin, propylene glycol, 1,3-butylene glycol, sorbitol, sodium pyrrolidone carboxylate, urea, sodium hyaluronate, etc., and one or more selected from these may be used.

[0066] The thickener may be an aqueous thickener, specifically, for example, carbomer, xanthan gum, dextrin, ethyl cellulose, polyvinyl alcohol, (dimethylacrylamide / sodium acryloyldimethyltaurate) copolymer, Tremella fuciformis polysaccharide, etc., and one or more selected from these may be used.

[0067] The pH adjuster, activator, preservative, etc. may be appropriately selected from known agents that are usually blended in cosmetics.

[0068] <Amount of each ingredient> From the viewpoint of achieving a good emulsified state, the content of the (A) surface-treated fine particle metal oxide in the oil-in-water cosmetic of the present invention may be 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more, based on the total mass of the oil-in-water cosmetic, and may be 20% by mass or less, 18% by mass or less, 15% by mass or less, 13% by mass or less, or 10% by mass or less.

[0069] From a similar perspective, the content of (A) surface-treated fine particle metal oxide in the oil-in-water cosmetic of the present invention may be 2% by mass or more, 5% by mass or more, 10% by mass or more, 12% by mass or more, or 15% by mass or more, based on the total mass of (B) water and (C) oil, and may be 30% by mass or less, 25% by mass or less, 20% by mass or less, or 18% by mass or less.

[0070] In the present invention, a portion of the surface-treated fine particle metal oxide (A) may be replaced with (A') a fine particle metal oxide other than the component (A).

[0071] (A') The fine particle metal oxide other than the component (A) is, for example, Untreated fine particle metal oxides, Surface-treated fine particle metal oxides that have been surface-treated with a hydrophobic treatment agent but not with a hydrophilic treatment agent; Surface-treated fine particle metal oxides that have been surface-treated with a hydrophilic treatment agent but not with a hydrophobic treatment agent; The surface is treated with a hydrophobic treatment agent and a hydrophilic treatment agent, but the ratio (M OIL / M WAT ) exceeds 0.090, surface-treated fine particle metal oxide It may be selected from the following.

[0072] The type of fine particle metal oxide in (A') the fine particle metal oxide other than component (A) may be the same as the type of fine particle metal oxide in component (A).

[0073] When a portion of the surface-treated fine particle metal oxide (A) is replaced with a fine particle metal oxide (A') other than component (A), from the viewpoint of achieving a good emulsified state, the content of the surface-treated fine particle metal oxide (A) may be 20 mass% or more, 30 mass% or more, 40 mass% or more, 50 mass% or more, 60 mass% or more, 70 mass% or more, 80 mass% or more, 90 mass% or more, or 95 mass% or more, based on the total mass of the surface-treated fine particle metal oxide (A) and the fine particle metal oxide (A') other than component (A).

[0074] The oil-in-water cosmetic of the present invention may typically not contain any fine particle metal oxide other than component (A')(A).

[0075] From the viewpoint of obtaining a cosmetic that feels good when used, the total content of (B) water and (C) oil in the oil-in-water cosmetic of the present invention may be 30% by mass or more, 40% by mass or more, 45% by mass or more, 50% by mass or more, or 55% by mass or more, based on the total mass of the oil-in-water cosmetic, and may be 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, or 60% by mass or less.

[0076] From a similar perspective, the ratio by mass of the (C) oil component to the total mass of the (B) water and (C) oil component in the oil-in-water cosmetic of the present invention may be 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, or 3.5% by mass or more, and may be 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 15% by mass or less, 10% by mass or less, 7.5% by mass or less, or 5.0% by mass or less.

[0077] The content of the (D) UV protection agent in the oil-in-water cosmetic of the present invention may be 50% by mass or less, based on the total mass of the oil-in-water cosmetic. From the viewpoint of ensuring an appropriate UV protection effect, the content of the (D) UV protection agent may be 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more, based on the total mass of the oil-in-water cosmetic, and may be 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, It may be 30% by mass or less, 25% by mass or less, or 20% by mass or less.

[0078] The content of the (E) other components in the oil-in-water cosmetic of the present invention may be determined appropriately for each component by a person skilled in the art depending on the specific use of the cosmetic. [Example]

[0079] Examples 1 to 14 and Comparative Examples 1 to 3 1. Preparation of cosmetics Cosmetic compositions containing water and oil were prepared by blending the components shown in Tables 1 to 4. In Tables 1 to 4, the blending amount of each component is expressed in mass % based on the total mass of the cosmetic composition.

[0080] Specifically, (A) a mixture of surface-treated fine particle metal oxide and, if blended, (A') other fine particle metal oxide, and (C) oil, and (B) a mixture of other ingredients in water were prepared separately, then mixed and shaken well to obtain a cosmetic composition.

[0081] The (A) surface-treated fine particle metal oxides and (A') other fine particle metal oxides shown in Tables 1 to 4 are all fine particles with an average primary particle size of 25 nm.

[0082] 2. Evaluation of cosmetics (1) Evaluation of emulsification state The cosmetic compositions obtained in each of the Examples and Comparative Examples were sampled in test tubes, and the emulsified state was visually examined and evaluated according to the following criteria. S: If emulsification is possible and a uniform emulsion is obtained A: When emulsification was successful, but a small amount of unevenly aggregated particles was observed B: When emulsification was successful, but many unevenly aggregated particles were observed C: If emulsification is not possible

[0083] (2) Evaluation of usability The cosmetic compositions obtained in each of the Examples and Comparative Examples were applied to the skin of the hands of a specialist panel, and an evaluation was made as to whether or not the cosmetic composition gave a sensation of bursting and spreading upon application.

[0084] The evaluation results are shown in Tables 1 to 4.

[0085] [Table 1]

[0086] [Table 2]

[0087] [Table 3]

[0088] [Table 4]

[0089] The following can be understood from Tables 1 to 4.

[0090] Comparative Example 1 using untreated fine zinc oxide particles, Comparative Example 2 using surface-treated fine zinc oxide particles that were surface-treated with a hydrophobic treatment agent but not with a hydrophilic treatment agent, and Comparative Example 3 using a surface-treated fine zinc oxide particle that was surface-treated with a hydrophobic treatment agent but not with a hydrophilic treatment agent. OIL / M WAT The cosmetic composition of Comparative Example 3, which used surface-treated zinc oxide particulates, in which the value of (a) was more than 0.090, was unable to obtain an emulsified state.

[0091] The ratio (M OIL / M WAT Although surface-treated zinc oxide fine particles having a surface-treated zinc oxide fine particle diameter of more than 0.090 do not fall under the category of component (A) specified in the present invention, they are listed in the column "(A) Surface-treated Metal Oxide Fine Particles" for the convenience of creating the table.

[0092] In contrast, the ratio (M OIL / M WAT The cosmetic compositions of Examples 1 to 14, which used surface-treated zinc oxide particulates with a ratio (M OIL / M WAT The cosmetic compositions of Examples 4 to 7 and 9 to 14, in which the value of (a) was 0.060 or less, exhibited an extremely good emulsified state.

[0093] It was also verified that the cosmetic compositions of Examples 1 to 14 give the user a fresh sensation of the cosmetic popping and spreading when applied.

Claims

1. (A) a surface-treated fine particle metal oxide that has been surface-treated with a hydrophobic treatment agent and a hydrophilic treatment agent; (B) water, and (C) Oil content An oil-in-water cosmetic comprising: the hydrophobic treatment agent contains a hydrophobic silicon compound, The hydrophilic treatment agent contains hydrated silica, and The amount of hydrophilic treatment agent (M ＷＡＴ (mol)) of the hydrophobic treatment agent (M ＯＩＬ (mol)) ratio (M ＯＩＬ / M ＷＡＴ ) is 0.090 or less, Oil-in-water cosmetics.

2. The oil-in-water cosmetic according to claim 1, wherein the hydrophobic silicon compound is a silicone.

3. 2. The oil-in-water cosmetic according to claim 1, wherein the hydrophobic silicon compound is one or more compounds selected from the group consisting of amino-modified silicone represented by the following general formula (1), hydrogen dimethicone, and octyltriethoxycaprylylsilane: 【Chemistry 1】 (In formula (1), R １ is selected from divalent hydrocarbon groups having 1 to 8 carbon atoms; n is a number from 1 to 5, R ２ is selected from a hydroxyl group and a monovalent hydrocarbon group having 1 to 20 carbon atoms; R ３ represents a monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, a hydroxyl group, and a group R １ -NH(CH ２ ) ｎ -NH ２ is selected from a and b are each a number of 1 or more, and a+b is a number average value of 2 or more and less than 2,000, Multiple Rs １ , R ２ , and R ３ may be the same or different groups, (SiR ２ ２ O) unit and (SiR ２ (R １ -NH(CH ２ ) ｎ -NH ２ 0) Units may be block or random.

4. The oil-in-water cosmetic according to any one of claims 1 to 3, wherein the surface-treated fine particle metal oxide is surface-treated fine particle zinc oxide.

5. The oil-in-water cosmetic according to any one of claims 1 to 3, wherein the average primary particle size is less than 80 nm.

6. The oil-in-water cosmetic according to claim 4, wherein the average primary particle size is less than 80 nm.

7. The oil-in-water cosmetic according to any one of claims 1 to 3, wherein the hydrophobic silicon compound is one or two compounds selected from aminoethylaminopropylmethylsiloxane dimethylsiloxane copolymer and hydrogen dimethicone.

8. 5. The oil-in-water cosmetic according to claim 4, wherein the hydrophobic silicon compound is one or two compounds selected from the group consisting of aminoethylaminopropylmethylsiloxane dimethylsiloxane copolymer and hydrogen dimethicone.

9. The ratio (M ＯＩＬ / M ＷＡＴ 4. The oil-in-water cosmetic according to claim 1, wherein the saturation coefficient (σ) of ...

10. The oil-in-water cosmetic according to any one of claims 1 to 3, wherein the hydrophobic treatment agent further comprises a fatty acid.

11. The oil-in-water cosmetic according to any one of claims 1 to 3, which is substantially free of a surfactant.

12. The oil-in-water cosmetic according to any one of claims 1 to 3, which is a sunscreen cosmetic.

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