Water-in-oil emulsified cosmetic

Abstract

To provide a water-in-oil emulsified cosmetic including a polyether-modified silicone-based emulsifier, the cosmetic exhibiting superior stability over time, a refreshing sensation during use, and a high SPF value.SOLUTION: A water-in-oil emulsion cosmetic comprises (A) purified water, (B) a polyether-modified silicone, (C) a carboxylic acid-modified silicone, (D) an oil-soluble ultraviolet absorber, (E) a water-soluble inorganic salt, and (F) an oil-soluble acrylic ester-based homopolymer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a water-in-oil emulsion cosmetic.

Background Art

[0002] Silicone oil has a light texture and is excellent in improving makeup durability, so it has been widely used. In water-in-oil emulsion cosmetics containing such silicone oil, silicone-based emulsifiers have often been used as emulsifiers (Patent Document 1). Among them, polyether-modified silicone has been used as an emulsifier that can emulsify both silicone oil and ester oil (Patent Documents 2 and 3).

[0003] However, in water-in-oil emulsion cosmetics containing a polyether-modified silicone-based emulsifier, the emulsion stability decreases, and a decrease or increase in viscosity over time is observed. Therefore, there is a demand for the development of a water-in-oil emulsion cosmetic with good stability over time in a water-in-oil emulsion cosmetic containing a polyether-modified silicone-based emulsifier.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a water-in-oil emulsion cosmetic having good stability over time, a fresh texture, and a high SPF value in a water-in-oil emulsion cosmetic containing a polyether-modified silicone-based emulsifier.

Means for Solving the Problems

[0006] Provide a water-in-oil emulsion cosmetic containing (A) to (F). (A) Purified water (B) Polyether-modified silicone (C) Carboxylic acid-modified silicone (D) Oil-soluble ultraviolet absorber (E) Water-soluble inorganic salt (F) Oil-soluble acrylate homopolymer

Effect of the Invention

[0007] The water-in-oil emulsion cosmetic using the silicone-based emulsifier of the present invention has good stability over time, has a fresh feeling in use, and exhibits the effect of having a high SPF value.

Modes for Carrying Out the Invention

[0008] The following describes the modes for carrying out the present invention.

[0009] (A) Purified water The water-in-oil emulsion cosmetic of the present invention contains purified water as an essential component from its emulsifier type. The blending amount of purified water is not particularly limited as long as it can take the form of a water-in-oil emulsion. It is preferably blended in an amount of 1% by mass or more, more preferably 10% by mass or more, and preferably 40% by mass or more in order to obtain a fresh feeling in use, based on the total amount of the water-in-oil emulsion cosmetic. The upper limit of the blending amount is preferably 70% by mass or less, more preferably 60% by mass or less, based on the total amount of the water-in-oil emulsion cosmetic.

[0010] (B) Polyether-modified silicone Polyether-modified silicone has a polyether chain as a side chain on the silicone chain of the main chain. In addition to the polyether chain as a side chain, it may also contain an alkyl chain and a silicone chain. Examples of polyether-modified silicone include PEG-9 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-10 methyl ether dimethicone, PEG-11 methyl ether dimethicone, cetyl PEG / PPG-10 / 1 dimethicone, PEG / PPG-20 / 22 butyl ether dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, etc. One or more of these can be used in combination. Among these, it is preferable to use either or both of PEG-10 dimethicone and PEG-9 polydimethylsiloxyethyl dimethicone.

[0011] The blending amount of (B) polyether-modified silicone in the water-in-oil emulsion cosmetic of the present invention is not particularly limited, but for example, it can be 0.1% by mass or more and 5% by mass or less based on the whole water-in-oil emulsion cosmetic. This blending amount is preferably 0.5% by mass or more, more preferably 1% by mass or more, and preferably 4.5% by mass or less, more preferably 4% by mass or less.

[0012] (C) Carboxylic acid-modified silicone Carboxylic acid-modified silicone has the following structural formula (1):

[0013] [Chemical formula] (In the formula, Rc is the general formula: -R 1 -(OR 2 ) p -(O) w -R 3 -COOH (R 1 represents a linear or branched alkylene group having 2 to 22 carbon atoms, and R 2 represents a linear or branched alkylene group having 2 to 4 carbon atoms, and R 3represents a linking group (-) or a linear or branched alkylene group having 1 to 22 carbon atoms, p represents a number from 0 to 200, and w represents a number of 0 or 1), and represents a carboxyl group-containing organic group represented by R is the same or different and represents an alkyl or alkoxy group having 1 to 22 carbon atoms or a phenyl group, R' is Rc or R, a and b are each 0 or a positive number, a + b is a number in the range of 0 to 30, and when b is 0, at least one of R' is Rc.) is represented. In particular, the carboxylic acid-modified silicone disclosed in JP-A-8-109263 and a part of the carboxylic acid-modified silicone disclosed in WO 2009 / 22621 (excluding those having a siloxane dendron structure) are represented by the above structural formula (1) and are included in the carboxylic acid-modified silicone preferably used in the present invention.

[0014] In the present invention, as the carboxylic acid-modified silicone represented by the structural formula (1), commercially available products of carboxylic acid-modified silicone can also be used, and specific examples thereof include BY16-880, BY16-750, FZ-3516, ES-5800 Formulation Aid (manufactured by Dow Corning Toray Co., Ltd.), TSF 4770, TSF4771 (manufactured by Momentive Performance Materials Inc.), X-22-162A, X-22-162C, X-22-3701E, X-22-3710 (manufactured by Shin-Etsu Chemical Co., Ltd.), and the like. In particular, as a preferred carboxylic acid-modified silicone in the present invention, those marketed under the trade name ES-5800 Formulation Aid (manufactured by Dow Corning Toray Co., Ltd.) can be mentioned.

[0015] The blending amount of the (C) carboxylic acid-modified silicone in the water-in-oil emulsion cosmetic of the present invention is not particularly limited, but for example, it can be 0.1% by mass or more and 5% by mass or less based on the whole water-in-oil emulsion cosmetic. This blending amount is preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and preferably 4.5% by mass or less, more preferably 4% by mass or less.

[0016] (D) Oil-soluble ultraviolet absorber The oil-soluble ultraviolet absorber is not particularly limited as long as it can be blended into cosmetics.Examples of such ultraviolet absorbers include cinnamic acid derivatives such as ethylhexyl paramethoxycinnamate, isopropyl methoxycinnamate, and isoamyl methoxycinnamate; PABA derivatives such as para-aminobenzoic acid (hereinafter abbreviated as "PABA"), ethyl PABA, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, and glyceryl PABA; salicylic acid derivatives such as homosalate, ethylhexyl salicylate, dipropylene glycol salicylate, and TEA salicylate; benzophenone derivatives such as benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12; benzylidene camphor derivatives such as 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphor sulfonic acid, camphor benzalkonium methosulfate, terephthalylidene dicitronellol sulfonic acid, and polyacrylamide methylbenzylidene camphor; triazine derivatives such as anisotriazine, diethylhexyl butamido triazone, 2,4,6-tris(diisobutyl-4'-aminobenzal malonate)-s-triazine, bis(ethylhexyl oxy)phenol methoxyphenyl triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine; phenylbenzimidazole derivatives such as disodium phenyl dibenzimidazole tetrasulfonate; phenylbenzotriazole derivatives such as drometrizole trisiloxane, methylene bis(benzotriazolyltetramethylbutylphenol); anthranil derivatives such as menthyl anthranilate; imidazoline derivatives such as 2-ethylhexyl dimethoxybenzylidene oxoimidazolidine propionate; benzal malonate derivatives such as polyorganosiloxane having a benzal malonate functional group; 4,4-diarylbutadiene derivatives such as 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene; and octocrylene, hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate, 4-tert-butyl-4'-methoxydibenzoylmethane, and the like.The oil-soluble ultraviolet absorber can be used alone or in combination of two or more. In the present invention, from the viewpoints of ultraviolet absorption ability and safety to the skin, it is preferable to use one or two selected from ethylhexyl paramethoxycinnamate and bis(ethylhexyl)oxyphenol methoxyphenyl triazine, and it is most preferable to use them in combination.

[0017] The blending amount of the oil-soluble ultraviolet absorber is preferably 1 to 20% by mass based on the total amount of the water-in-oil emulsion cosmetic. If it is less than 1% by mass, a sufficient sunburn prevention effect cannot be obtained, and if it exceeds 20% by mass, it may have an adverse effect on the usability, such as stickiness or increased primary irritation to the skin.

[0018] (E) Water-soluble inorganic salts Examples of the water-soluble inorganic salts include salts of alkali metals, alkaline earth metals and halogens, sulfuric acid, sulfurous acid, phosphoric acid, carbonic acid, etc. Specifically, chlorides such as sodium chloride, potassium chloride, calcium chloride, magnesium chloride, sulfates such as sodium sulfate, potassium sulfate, magnesium sulfate, sulfites such as sodium pyrosulfite, carbonates such as sodium carbonate, sodium hydrogen carbonate, etc. are included. In the present invention, it is preferable to use sodium chloride from the viewpoint of the stability over time of the water-in-oil emulsion cosmetic.

[0019] The blending amount of the water-soluble inorganic salt is preferably 0.05% by mass or more and 5% by mass or less based on the total amount of the water-in-oil emulsion cosmetic. It is preferably 0.1% by mass or more, more preferably 0.2% by mass or more. Also, it is preferably 4% by mass or less, more preferably 3% by mass or less.

[0020] (F) Oil-soluble acrylate homopolymer The oil-soluble acrylate homopolymer means an oil-soluble polymer composed of one or more repeating structural units derived from acrylate. As the residue of the fatty acid in the acrylate ester, a linear or branched saturated fatty acid residue is preferred. Further, from the viewpoints of the ultraviolet ray protection effect and stability, the number of carbon atoms of the fatty acid residue is preferably 8 to 32, more preferably 10 to 30. As the acrylate ester, an alkyl acrylate ester is preferred. For example, decyl acrylate, isodecyl acrylate, lauryl acrylate, stearyl acrylate, isostearyl acrylate, behenyl acrylate and the like can be mentioned. Among these, from the viewpoints of the ultraviolet ray protection effect and stability, it is preferable to use one or two selected from stearyl acrylate and behenyl acrylate.

[0021] Examples of commercially available products of the oil-soluble acrylate ester-based homopolymer include "TEGOSP 13-1" (stearyl-modified acrylate homopolymer), "TEGOSP 13-6" (behenyl-modified acrylate homopolymer), and "TEGOSP 13 SUNUP" (both stearyl- and behenyl-modified acrylate homopolymer) (manufactured by Evonik Industries AG) and the like.

[0022] The compounding amount of the oil-soluble acrylate ester-based homopolymer is preferably 0.01 to 1% by mass based on the total amount of the water-in-oil emulsion cosmetic, and more preferably 0.05% by mass or more for the purpose of obtaining a high SPF value.

[0023] Other components that can be incorporated into the water-in-oil emulsion cosmetic of the present invention will be described.

[0024] (Humectant component) In the water-in-oil type emulsified cosmetic of the present invention, a moisturizing component can be blended. Such a moisturizing component is not particularly limited as long as it can be blended in cosmetics, but it is not particularly limited as long as it can be normally blended in cosmetics. Examples include polyols and their polymers such as glycerin, 1,3-butylene glycol, propylene glycol, 3-methyl-1,3-butanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-pentanediol, trimethylolpropane, pentaerythritol, hexylene glycol, diglycerin, polyglycerin, diethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, and ethylene glycol-propylene glycol copolymer; glycol alkyl ethers such as diethylene glycol monoethyl ether (ethoxydiglycol), ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, and diethylene glycol dibutyl ether; sugar alcohols such as sorbitol, xylitol, erythritol, mannitol, and maltitol; sugars and their derivatives such as glucose, fructose, galactose, mannose, threose, xylose, arabinose, fucose, ribose, deoxyribose, maltose, trehalose, sucrose, lactose, raffinose, gluconic acid, glucuronic acid, cyclodextrins (α-, β-, γ-cyclodextrin, and modified cyclodextrins such as maltosylated and hydroxyalkylated cyclodextrin), β-glucan, chitin, chitosan, heparin and its derivatives, pectin, arabinogalactan, dextrin, dextran, glycogen, ethyl glucoside, glucosyl ethyl methacrylate polymer or copolymer; natural polysaccharides such as hyaluronic acid, sodium hyaluronate, acetylated hyaluronic acid, sodium chondroitin sulfate, mucoitin sulfate, caronin sulfate, keratosulfate, dermatan sulfate, jellyfish polysaccharide, fucoidan, and tuberose polysaccharide; organic acids such as citric acid, tartaric acid, and lactic acid and their salts; urea, 2-pyrrolidone-5-carboxylic acid and its salts such as sodium salt; betaine (trimethylglycine), proline, hydroxyproline, arginine, lysine, serine, glycine, alanine, phenylalanine, tyrosine, β-alanine,Amino acids such as threonine, glutamic acid, glutamine, asparagine, aspartic acid, cysteine, cystine, methionine, leucine, isoleucine, valine, tryptophan, histidine, taurine and their salts, collagen and its derivatives and hydrolyzates, elastin and its hydrolyzates, hydrolyzed keratin, hydrolyzed conchiolin, silk proteolytic peptides, hydrolyzed silk, sodium lauroyl hydrolyzed silk, soy proteolytic peptides, wheat proteolytic peptides, hydrolyzed wheat protein, caseinolytic peptides, hydrolyzed eggshell membrane protein, acylated peptides and other protein peptides and their derivatives, rice fermentation broth, rice bran fermentation broth, sake lees extract, Japanese sake extract, palmitoyl oligopeptide, palmitoyl pentapeptide, palmitoyl tetrapeptide and other acylated peptides, silylated peptides, lactic acid bacteria culture solution, yeast extract, bovine submandibular gland mucin, hypotaurine, sesame lignan glycoside, glutathione, albumin, whey, choline chloride, phosphorylcholine, placenta extract, etc. Among these water-soluble moisturizers, one or more selected from glycerin, 1,3-butylene glycol, dipropylene glycol, propylene glycol, betaine, rice fermentation broth, rice bran fermentation broth, sake lees extract, Japanese sake extract can be used.

[0025] (Liquid oil) In the water-in-oil emulsion cosmetic of the present invention, a liquid oil can be blended. Such liquid oils are those usually used in cosmetics and can be used without particular limitation as long as they are liquid at 25°C. Such liquid oils include vegetable oils such as rapeseed oil, avocado oil, almond oil, olive oil, kukui nut oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, rice oil, safflower oil, sunflower oil, soybean oil, evening primrose oil, corn oil, rapeseed oil, peach kernel oil, palm oil, palm kernel oil, castor oil, jojoba oil, grape seed oil, macadamia nut oil, meadowfoam oil, mink oil, Japanese wax tree oil; Animal oils such as liquid horse oil, mink oil, liquid lanolin; Straight-chain or branched-chain hydrocarbon oils such as liquid paraffin, light isoparaffin, squalane, squalene; Higher fatty acids such as oleic acid, isostearic acid; Higher alcohols such as isostearyl alcohol, octyldodecanol, and hexyl decanol; Alkyl glyceryl ethers such as isostearyl glyceryl ether; Ester oils of linear fatty acids and lower alcohols such as isopropyl myristate, butyl myristate, isopropyl palmitate, ethyl stearate, butyl stearate, ethyl oleate, ethyl linoleate, and isopropyl linoleate; Ester oils of linear fatty acids and linear higher alcohols such as cetyl caprate, hexyl laurate, decyl myristate, myristyl myristate, cetyl myristate, cetyl palmitate, stearyl stearate, decyl oleate, and oleyl oleate; Ester oils of linear fatty acids and branched-chain alcohols such as isostearyl laurate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, octyldodecyl myristate, 2-ethylhexyl palmitate, isocetyl palmitate, isostearyl palmitate, 2-ethylhexyl stearate, isocetyl stearate, isodecyl oleate, octyldodecyl oleate, and octyldodecyl ricinoleate; Ester oils of branched-chain fatty acids and lower alcohols such as ethyl isostearate and isopropyl isostearate; Ester oils of branched-chain fatty acids and linear higher alcohols such as cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, hexyl isostearate, and 2-hexyldecyl isostearate; Esters of fatty acids and polyhydric alcohols such as ethylene glycol dioctanoate, ethylene glycol dioleate, propylene glycol dicaprylate, propylene glycol di(caprylate / caprate), propylene glycol dicaprylate, dipropylene glycol dioleate, neopentyl glycol dicaprylate, neopentyl glycol dioctanoate, glyceryl tricaprylate, glyceryl tri(2-ethylhexanoate), glyceryl tri(caprylate / caprate), glyceryl triisopalmitate, glyceryl diisostearate, trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate, pentaerythritol tetra(2-ethylhexanoate), pentaerythritol tetraisostearate, pentaerythritol tetra(2-ethylhexanoate); Esters of branched-chain fatty acids and branched-chain alcohols such as octyldodecyl neopentanoate, isocetyl octanoate, isostearyl octanoate, 2-ethylhexyl isopalmitate, hexyldecyl dimethyloctanoate, octyldodecyl dimethyloctanoate, 2-ethylhexyl isopalmitate, isocetyl isostearate, isostearyl isostearate, octyldodecyl isostearate; Esters with hydroxyl groups such as lauryl lactate, myristyl lactate, cetyl lactate, octyldodecyl lactate, trioctyl citrate, triisocetyl citrate, trioctyldodecyl citrate, diisostearyl malate; Esters of dibasic acids such as dioctyl succinate, diisopropyl adipate, diisobutyl adipate, dioctyl adipate, diethyl sebacate, diisopropyl sebacate, dioctyl sebacate; Silicone oils such as dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, silicone oils modified with higher alcohols; Fluorine oils such as fluoropolyethers, perfluoroalkyl ether silicones, etc. can be mentioned.

[0026] (Oil thickener) In the water-in-oil type emulsified cosmetic of the present invention, an oil thickener other than an oil-soluble acrylic acid ester-based homopolymer can be blended. Examples of such oil thickeners include those used in ordinary cosmetics, such as solid waxes, organically modified clay minerals, fumed silica, colloidal silica, dextrin fatty acid esters, metal soaps, sucrose fatty acid esters, amino acid-based gelling agents, and the like. Among these, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., it is preferably at least one selected from the group consisting of solid waxes, organically modified clay minerals, dextrin fatty acid esters, and amino acid-based gelling agents, and more preferably at least one selected from the group consisting of solid waxes, organically modified clay minerals, and dextrin fatty acid esters.

[0027] Examples of the solid wax include waxes having a melting point of 61°C or higher. Waxes having a melting point of 61°C or higher exhibit a solid state at 25°C. In the present invention, the melting point is measured by any one of the specifications for raw materials for quasi-drugs, Method 1, Method 2, or Method 3 of the general test methods. Which method to adopt depends on each component. If there is a description of the measurement method in the specifications for raw materials for quasi-drugs, follow it. If there is no description, select the measurement method in consideration of the melting point. Specifically, when the melting point is extremely high, exceeding 80°C significantly, Method 1 is generally used; for solid fats with a lower melting point than this, Method 2 is used; and for what is called paste oil in catalogs, etc., Method 3 is generally used. However, any method that can be measured may be used.

[0028] The waxes with a melting point of 61°C or higher are not particularly limited as long as they are those commonly used in cosmetics. For example, mineral waxes such as ozokerite and ceresin; petroleum waxes such as paraffin and microcrystalline wax; synthetic hydrocarbons such as Fischer-Tropsch wax, polyethylene wax, and synthetic hydrocarbon wax; plant waxes such as carnauba wax, candelilla wax, rice wax, and sunflower wax; animal waxes such as beeswax and whale wax; synthetic waxes such as silicone wax and synthetic beeswax; and the like can be mentioned. Among these, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., one or more selected from the group consisting of petroleum waxes and silicone waxes are preferable. Also, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., these waxes preferably have a melting point of 65°C or higher and 140°C or lower, more preferably 70°C or higher and 110°C or lower.

[0029] The organically modified clay minerals are not particularly limited as long as they are those commonly used in cosmetics. For example, cation-modified clay minerals obtained by treating layered clay minerals such as bentonite, laponite, hectorite, montmorillonite, and magnesium aluminum silicate with a quaternary ammonium salt-type cationic surfactant can be mentioned. Specifically, one or more selected from the group consisting of benzyl dimethyl stearyl ammonium chloride and dimethyl distearyl ammonium chloride are preferable, and dimethyl distearyl ammonium chloride is more preferable. Commercially available products of organically modified clay minerals include "Benton 38", "Benton 38VCG", "Benton 27" (manufactured by Elementis Japan Co., Ltd.), and the like.

[0030] The organically modified clay minerals can also be used as a premix gel diluted with a solvent from the viewpoints of improving workability and enhancing the thickening effect. Specifically, a premix gel in which an organically modified clay mineral is previously dispersed in a solvent is preferred. The solvent is not limited as long as it can be gelled by the organically modified clay mineral, and from the viewpoint of improving the thickening effect, octyldodecanol, mineral oil, etc. are preferred. Further, from the viewpoint of efficiently dispersing the organically modified clay mineral, it is preferable to further contain polar additives such as propylene carbonate, ethanol, water, and various surfactants. From the viewpoints of improving workability and thickening effect, and suppressing oil separation of the premix gel itself, the content of the organically modified clay mineral in the premix gel is preferably 5% by mass or more, more preferably 8% by mass or more, still more preferably 10% by mass or more, and preferably 25% by mass or less, more preferably 20% by mass or less, still more preferably 18% by mass or less. Examples of commercially available products of the premix gel include "Benton Gel EUGV", "Benton Gel MIOV", "Benton Gel VS-5 PCV", "Benton Gel PTM V", "Benton Gel GTCC V" (manufactured by Elementis Japan Co., Ltd.), etc.

[0031] The dextrin fatty acid ester is not particularly limited as long as it is used in ordinary cosmetics. From the viewpoint of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., an ester of a fatty acid having 8 to 24 carbon atoms and dextrin is preferred, and an ester of a fatty acid having 14 to 20 carbon atoms and dextrin is more preferred. Further, it is preferable that the average degree of polymerization of dextrin is 3 or more and 150 or less. Specific examples include dextrin palmitate, dextrin stearate, dextrin palmitate / stearate, dextrin oleate, dextrin isopalmitate, dextrin isostearate, dextrin myristate, dextrin palmitate / 2-ethylhexanoate, etc. Among these, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., dextrin palmitate, dextrin myristate, and dextrin palmitate-2-ethylhexanoate are preferable, and those containing at least dextrin palmitate are more preferable. Examples of commercially available dextrin fatty acid esters include dextrin palmitate ("Leopal KL2", "Leopal KS2", "Leopal TL2"), dextrin palmitate-2-ethylhexanoate "Leopal TT2", dextrin myristate "Leopal MKL2" (all manufactured by Chiba Flour Milling Co., Ltd.), etc.

[0032] The amino acid-based gelling agent can be used without particular limitation as long as it is one used in ordinary cosmetics. Specifically, dibutyl lauroyl glutamide and dibutyl ethylhexanoyl glutamide are preferable. Examples of commercially available amino acid-based gelling agents include dibutyl lauroyl glutamide "GP-1", dibutyl ethylhexanoyl glutamide "EB-21" (both manufactured by Ajinomoto Co., Inc.), etc.

[0033] From the viewpoints of improving workability and enhancing the thickening effect, the amino acid-based gelling agent can also be used as a premix gel diluted and dissolved with a solvent. Specifically, a premix gel in which the amino acid-based gelling agent is previously dissolved in a solvent is preferable. The solvent is not limited as long as it can be gelled by the amino acid-based gelling agent, but from the viewpoint of enhancing the thickening effect, octyldodecanol, isostearic acid, etc. are preferable. The content of the amino acid-based gelling agent in the premix gel is preferably 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, and preferably 45% by mass or less, more preferably 40% by mass or less, still more preferably 36% by mass or less, from the viewpoints of improving workability and enhancing the thickening effect, and suppressing oil separation of the premix gel itself. Examples of commercially available premixed gels include "AJK-OD2046" (containing 20% by mass of an amino acid-based gelling agent), "AJK-IS3613" (containing 36% by mass of an amino acid-based gelling agent) (both manufactured by Kao Alcohol Industries Co., Ltd.), and the like.

[0034] The water-in-oil emulsion cosmetic of the present invention can contain metal oxide fine particles for the purpose of imparting an ultraviolet ray protection function. As such metal oxide fine particles, those having an average particle diameter of 1 μm or less, preferably 0.1 μm or less, more preferably 0.1 to 0.01 μm as measured by a laser diffraction particle size distribution measurement method are preferred. Also, zinc oxide, titanium oxide, iron oxide, cerium oxide, etc. are preferably used as the metal oxide. Such metal oxide fine particles may be metal oxide fine particles whose surface activity has been reduced with an inorganic compound such as silica or alumina.

[0035] Examples of commercially available zinc oxide fine particles as such metal oxide fine particles include FINEX-50 (manufactured by Sakai Chemical Industry Co., Ltd.), ZnO-350 (manufactured by Sumitomo Osaka Cement Co., Ltd.), Zinc Oxide FZO-50 (manufactured by Ishihara Sangyo Co., Ltd.), Micronized Zinc Oxide MZ-500 (manufactured by Teika Co., Ltd.), and the like. Examples of commercially available titanium oxide fine particles include STR-60, STR-100 (both manufactured by Sakai Chemical Industry Co., Ltd.), MT-500B (manufactured by Teika Co., Ltd.), and the like.

[0036] The method for preparing the water-in-oil emulsion cosmetic of the present invention is not particularly limited, and it can be prepared by a method for preparing a normal water-in-oil emulsion cosmetic.

[0037] In the water-in-oil emulsion cosmetic of the present invention, in addition to the above-mentioned essential components and optional components, aqueous components, pigments, surfactants, water-soluble thickeners, beauty components, fragrances, polymer substances, antibacterial and preservative agents, alcohols, powders, bio-derived components, etc., which are usually formulated in cosmetics as needed, can be appropriately formulated.

Examples

[0038] Hereinafter, the present invention will be specifically described by way of examples, but the scope of the present invention is not limited thereby. The blending amounts are in mass % unless otherwise specified.

[0039] First, the evaluation methods of the examples and comparative examples of the present invention are shown. The examples and comparative examples were prepared by a conventional method.

[0040] [Stability over time] The stability over time was evaluated by measuring the viscosities of the examples or comparative examples on the day after preparation and after 2 months. The viscosity was measured using a BL-type viscometer under the conditions of a 4 - rotor, 6 rpm, and 1 minute for the bulk stored in a 70 mL mayonnaise bottle at 25°C. Evaluation was performed according to the following criteria, and the results are shown in Table 1. 〇: No significant change in viscosity is observed after 2 months. △: The viscosity slightly decreases after 2 months ×: A significant decrease in viscosity is observed after 2 months

[0041] [Feeling] The usability of the examples or comparative examples was individually evaluated by 3 experts in the sensory evaluation of cosmetics. The evaluation results were evaluated according to the following criteria by consensus, and the results are shown in Table 1. 〇: It has a fresh usability ×: The usability is not fresh

[0042] [UV protection effect] The UV protection effect was measured in vitro using an SPF analyzer (UV - 2000S manufactured by Labsphere). The measurement conditions were as follows: After uniformly applying each sample shown in Table 1 to a blender surgical tape (manufactured by 3M) at a ratio of 1 mg / cm 2 , the average value of 5 measurements of the SPF value in the range of 290 - 400 nm was calculated using the above - mentioned measuring instrument, and evaluation was performed as follows. The results are shown in Table 1. 〇: Similar to Example 1 ×: The SPF value is lower than that of the example

[0043]

Table 1

[0044] As shown in Table 1, the water-in-oil emulsion cosmetic of the present invention was shown to have good viscosity stability over time, a fresh feeling, and a high SPF value.

Claims

Claim 1 An oil-in-water type emulsified cosmetic containing (A) to (F). (A) Purified water (B) Polyether-modified silicone (C) Carboxylic acid-modified silicone (D) Oil-soluble ultraviolet absorber (E) Water-soluble inorganic salt (F) Oil-soluble acrylate homopolymer

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