Water-in-oil emulsification composition

Abstract

To provide water-in-oil emulsification compositions that spread well when applied, have excellent finish uniformity, and have excellent freshness.SOLUTION: The present invention provides a water-in-oil emulsification composition containing A) a powder coated with at least an amino acid; and B) a silicone elastomer type surfactant.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] Water-in-oil emulsion preparations have an oil phase in the continuous phase, so they are water-resistant, in other words sweat-resistant, and have good makeup durability, making them suitable for use in liquid foundations and the like. Among them, low-viscosity water-in-oil emulsion preparations spread well when applied and are excellent in usability (e.g., Patent Document 1). On the other hand, such low-viscosity water-in-oil emulsion preparations have the problem that the film does not spread evenly and becomes uneven. To address this, the amount of powder is usually increased to maintain the film thickness, which causes squeaking and makes it difficult to maintain a fresh feel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-248127 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made under such circumstances, and an object of the present invention is to provide a water-in-oil emulsion composition which spreads well when applied, has excellent finish uniformity, and is fresh and moist. [Means for solving the problem]

[0005] The present inventors have found that the above-mentioned problems can be solved by providing a water-in-oil emulsion composition containing at least a powder coated with an amino acid and a silicone elastomer surfactant, and have completed the present invention. That is, the gist of the present invention relates to the following.

[0006] [1] A) a powder coated with at least an amino acid; and B) silicone elastomer type surfactants; A water-in-oil emulsion composition comprising: [2] The water-in-oil emulsion composition according to [1], wherein the viscosity of the water-in-oil emulsion composition is 5,000 mPa s or less. [3] The water-in-oil emulsion composition according to [1] or [2], wherein the amino acid is an N-acylated amino acid or a salt thereof. [4] The water-in-oil emulsion composition according to any one of [1] to [3], wherein the amino acid is stearoyl glutamate. [5] The water-in-oil emulsion composition according to any one of [1] to [4], wherein A) the powder coated with at least an amino acid is further coated with a silicone compound.

[0007] [6] The water-in-oil emulsion composition according to [5], wherein the silicone compound is an alkoxysilyl group-containing silicone. [7] The water-in-oil emulsion composition according to [5] or [6], wherein the silicone compound is trimethoxysilyl dimethicone. [8] The water-in-oil emulsion composition according to any one of [1] to [7], wherein A) the powder coated with at least an amino acid contains titanium oxide or iron oxide. [9] The water-in-oil emulsion composition according to any one of [1] to [8], wherein the silicone elastomer surfactant contains a polyoxyalkylene group as a hydrophilic group.

[10] The water-in-oil emulsion composition according to any one of [1] to [9], wherein the silicone elastomer surfactant contains a polyoxyethylene group as a hydrophilic group.

[0008]

[11] The water-in-oil emulsion composition according to any one of [1] to

[10] , wherein the silicone elastomer surfactant is a (dimethicone / (PEG-10 / 15)) crosspolymer.

[12] The water-in-oil emulsion composition according to any one of [1] to

[11] , wherein the oil phase of the water-in-oil emulsion composition contains a silicone oil.

[13] A water-in-oil emulsion composition according to any one of [1] to

[12] , wherein the content of the powder coated with at least an amino acid is 1 to 30 mass% based on the total mass of the water-in-oil emulsion composition. Composition.

[14] The water-in-oil emulsion composition according to any one of [1] to

[13] , wherein the content of the silicone elastomer surfactant B) is 0.1 to 10 mass% based on the total mass of the water-in-oil emulsion composition. thing.

[15] The water-in-oil emulsion composition according to any one of [1] to

[14] , wherein the content of the aqueous phase in the water-in-oil emulsion composition is 20 to 50 mass% based on the total mass of the water-in-oil emulsion composition.

[0009]

[16] The water-in-oil emulsion composition according to any one of [1] to

[15] , which is a liquid foundation.

[17] A) a powder surface-treated with at least an amino acid; and B) silicone elastomer type surfactants; A method for producing a water-in-oil emulsion composition, comprising the step of mixing: Effect of the Invention

[0010] According to the present invention, it is possible to provide a water-in-oil emulsion composition which has good spreadability when applied, excellent finish uniformity, and excellent freshness. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In explaining the details of the water-in-oil emulsion composition of the present invention, specific examples will be given. However, the present invention is not limited to the following content as long as it does not deviate from the spirit of the present invention, and can be modified as appropriate.

[0012] <Water-in-oil emulsion composition> One aspect of the present invention relates to a water-in-oil emulsion composition (hereinafter, sometimes referred to as the "water-in-oil emulsion composition of the present invention") containing A) a powder coated with at least an amino acid; and B) a silicone elastomer surfactant.

[0013] The present inventors have conducted extensive research in search of a water-in-oil emulsion composition that spreads well when applied, has excellent finish uniformity, and is fresh. As a result, they have found that by blending at least a powder coated with an amino acid and a silicone elastomer surfactant, the powder can be uniformly and stably dispersed in the oil phase of the water-in-oil emulsion composition, the film thickness can be maintained when applied, the film can spread evenly, and the film can have a fresh feel without any squeaking. The present invention has been achieved based on such findings.

[0014] ≪Viscosity≫ From the viewpoint of usability such as spreadability when applied, the water-in-oil emulsion composition of the present invention has a viscosity of, for example, 5,000 mPa·s or less, 3,500 mPa·s or less, 3,000 mPa·s or less, or 2,750 mPa·s or less. The lower limit of the viscosity is not particularly limited, but is, for example, about 200 mPa·s or more, 1000 mPa·s or more, 2,000 mPa·s or more, or 2,500 mPa·s or more. The viscosity is measured at 25° C. using a Brookfield viscometer. The value measured with a Brookfield viscometer (rotor No. 4, rotation speed 6 rpm) can be used.

[0015] <<Powder coated with at least amino acids>> The powder coated with at least an amino acid used in the present invention is a powder that has been surface-treated with an amino acid. The state of the amino acid coating may be either bonded (covalent bond, etc.) to the powder or not bonded (adsorption, etc.). The amount of amino acid (coating amount) relative to the powder is not limited, but may be, for example, 1 to 40% by mass, or 5 to 20% by mass relative to the powder amount.

[0016] The amino acid is not particularly limited as long as it is an amino acid that is usually used as a lipophilic component to coat powders. The amino acid may be used alone or in combination of two or more kinds having different compositions.

[0017] As the amino acid, for example, N-acylated amino acids and salts thereof can be preferably used. The N-acylated amino acids used in the present invention are N-acylated compounds of amino acids selected from saturated fatty acids having 12 to 20 carbon atoms (e.g., lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, etc.) and aspartic acid, glutamic acid, alanine, lysine, glycine, sarcosine, proline, hydroxyproline, etc., and the carboxyl group of the amino acid may be in a free form or a salt of K, Na, Fe, Zn, Ca, Mg, Al, Zr, Ti, etc. Preferably, For the cations, the free form or water-soluble salts of K or Na can be used. If the salt is not water-soluble, it can be dissolved in water with an alkali. It can be converted into a water-soluble salt and used.

[0018] More specifically, examples of N-acylated amino acids and salts thereof include lauroyl glutamic acid or its sodium salt or potassium salt, myristoyl glutamic acid or its sodium salt or potassium salt, palmitoyl glutamic acid or its sodium salt or potassium salt, stearoyl glutamic acid or its sodium salt or potassium salt, etc. Preferred are stearoyl glutamate salts such as sodium stearoyl glutamate and disodium stearoyl glutamate.

[0019] Such powders coated with at least an amino acid may be commercially available products. Examples of commercially available products include NAI-treated powders from Miyoshi Kasei Co., Ltd. The commercially available powder can be coated with an amino acid and used.

[0020] Silicone compounds The powder coated with at least an amino acid used in the present invention may be further coated with a silicone compound. The silicone compound coating may be either bonded (covalently bonded, etc.) to the powder or not bonded (adsorbed, etc.).

[0021] The amount of the silicone compound (coating amount) relative to the powder is not limited, but may usually be about 1 to 40% by mass, and preferably about 5 to 20% by mass, relative to the powder amount.

[0022] The order of coating with the amino acid and the silicone compound is not particularly limited, but is preferably, from the inside, the amino acid coating and the silicone compound coating. The ratio (mass ratio) of the amount (coating amount) of the amino acid to the silicone compound in the powder is not limited, but may be, for example, 1:0.1 to 1:10, 1:0.14 to 1:7, 1:0.2 to 1:5, 1:0.5 to 1:2, or 1:1. That's fine.

[0023] The silicone compound is not particularly limited as long as it is a silicone compound that is usually used as a lipophilic component to coat powder. The silicone compound may be one of a variety of silicone compounds having different compositions, or Two or more of them may be used in combination.

[0024] The silicone compound may be, for example, a linear structure having functional groups at both ends or one end. Organopolysiloxanes having the above structure can be selected. Examples of the silicone compound include alkylsilyl group-containing silicones containing monoalkylsilyl, dialkylsilyl, and trialkylsilyl groups (preferably alkyl groups having 1 to 2 carbon atoms) as functional groups; and alkoxysilyl group-containing silicones containing monoalkoxysilyl, dialkoxysilyl, and trialkoxysilyl groups (preferably alkoxy groups having 1 to 2 carbon atoms). Preferred are alkoxysilyl group-containing silicones. Specific examples of the silicone compound include trimethoxysilyl dimethicone.

[0025] The powder coated with amino acid and silicone compound may be a commercially available product. For example, SA / NAI treated powder from Miyoshi Kasei Co., Ltd. may be used. Alternatively, a commercially available powder may be coated with amino acid and silicone compound to produce the powder.

[0026] ≪Powder≫ The powder in the powder coated with at least amino acid may be any powder that can be generally used as a powder in cosmetics. As the powder, the powder described below as an optional component can be used. Preferable examples include titanium oxide and iron oxide. The powder may be blended in one type or in a combination of two or more types having different particle sizes, compositions, etc.

[0027] The shape of the powder may be plate-like, spherical, cubic, petal-like, butterfly-like, cocoon-like, amorphous, fibrous, etc. The average particle size is preferably in the range of 1 nm to 2.0 μm. The average particle size is preferably 1 nm to 800 nm, but may be any size that can be incorporated into cosmetics. In the present invention, the term "average particle size" specifically refers to the volume average particle size of powder particles, and is calculated, for example, by acquiring a transmission electron microscope (TEM) image and analyzing the image. It is possible. The powder may also be coated with at least one oxide or hydrous oxide of aluminum, silica, zirconium, and the like.

[0028] ≪Content≫ The content of the powder coated with at least an amino acid (component A) in the water-in-oil emulsion composition of the present invention is not limited, and may be, for example, 1% by mass to 30% by mass, 2% by mass to 15% by mass, or 5% by mass to 10% by mass relative to the total amount of the composition.

[0029] The water-in-oil emulsion composition of the present invention may contain, as a powder, a powder other than the powder coated with at least an amino acid of component A. The powder other than the powder coated with at least an amino acid may be any powder that can be commonly used in cosmetics. Powders other than those coated with at least an amino acid may be blended in one type or in combination of two or more types having different compositions.

[0030] The total powder content in the water-in-oil emulsion composition of the present invention may be, for example, 1 to 50% by mass, 2 to 40% by mass, or 5 to 15% by mass relative to the total amount of the composition. The amount of at least the powder coated with an amino acid and the other powder is not limited, but may be, for example, a mass ratio of 1:0.1 to 1:10, or 1:0.4 to 1:2.

[0031] <Silicone elastomer surfactant> The silicone elastomer surfactant used in the present invention is not limited as long as it is made of a silicone elastomer that has sufficient hydrophilic crosslinking groups in the organopolysiloxane and has surfactant properties, and the molecular design can be appropriately performed. Examples of the silicone elastomer include copolymers of organopolysiloxane and hydrophilic monomers. Examples of silicone elastomers having a hydrophilic crosslinking group include, but are not limited to, polyether-modified silicones and polyglycerin-modified silicones.

[0032] The hydrophilic crosslinking group is not particularly limited as long as it is one that is generally used in preparing an amphiphilic silicone compound. For example, polyethylene glycol (PEG), polypropylene A group obtained by copolymerizing pyrene glycol (PPG), etc. (polyoxyethylene, polyoxyethylene and groups obtained by copolymerizing polyglycerin, etc., among which polyoxyalkylene groups are preferred, and polyoxyethylene groups are more preferred. The hydrophilic group may contain only one type or multiple types.

[0033] In order for the silicone elastomer to have sufficient hydrophilicity, the structural unit of the crosslinking group that is hydrophilic to the entire silicone elastomer (for example, in the case of a group obtained by copolymerizing PEG, The proportion of polyoxyethylene groups (-CH2CH2O-) may be, for example, 20 to 50 mass %, or 30 to 50 mass %.

[0034] More specifically, the silicone elastomer includes a (dimethicone / (PEG-10 / 15)) crosspolymer. Such silicone elastomer type surfactant may be a commercially available product. For example, silicone KSG210 from Shin-Etsu Silicone Co., Ltd. may be mentioned as a commercially available product. Alternatively, a commercially available organopolysiloxane produced by copolymerizing a hydrophilic monomer may be used. The silicone elastomer type surfactant may be blended in the composition with only one type having different compositions, or may be blended in a combination of two or more types.

[0035] ≪Content≫ The content of the silicone elastomer surfactant of component B) in the water-in-oil emulsion composition of the present invention is, for example, 0.1% by mass to 10% by mass, 0.2% by mass to 5% by mass, or Or it may be 0.5% by mass to 1% by mass. Furthermore, the content of the silicone elastomer surfactant of component B) in the water-in-oil emulsion composition of the present invention may be, for example, 0.1% by mass to 1.2% by mass, or 0.5% by mass to 1% by mass, relative to the oil phase.

[0036] The water-in-oil emulsion composition of the present invention may contain a surfactant other than a silicone elastomer surfactant. The surfactant other than a silicone elastomer surfactant may be any surfactant that can be commonly used as a surfactant in cosmetics. The surfactant may be any of the surfactants described below as optional components.

[0037] <Oil Phase> The water-in-oil emulsion composition of the present invention contains an oil phase as the external phase of the composition. The components constituting the oil phase may be any components that can be commonly used as oils in cosmetics. As the oil, for example, the oils described below as optional components can be used. As the oil, it is preferable to contain silicone oil from the viewpoint of usability (excellent spreadability, etc.). Examples of silicone oils include hydrogen dimethicone, caprylyl methicone, dimethicone, diphenylsiloxyphenyl trimethicone, and cyclopentasiloxane. From the viewpoint of usability (excellent spreadability, etc.), the viscosity of the silicone oil at 25°C is, for example, 1,000 mPa·s or less. The viscosity is measured at 25° C. using a Brookfield viscometer. The content of the oil phase in the composition of the present invention is not particularly limited, and may be, for example, 20 to 90 mass %, 30 to 70 mass %, or 40 to 60 mass % relative to the total mass of the composition.

[0038] ≪Aqueous phase≫ The water-in-oil emulsion composition of the present invention contains an aqueous phase as the internal phase of the composition. The aqueous phase components are usually water-soluble components in addition to water, and are components that dissolve in water after being suspended in water at 25 to 65°C and left to stand for 1 hour. The term "aqueous phase component" refers to a component (excluding surfactants) that is an aqueous phase component. Either one type or a combination of two or more types may be used in the present invention. The content of the aqueous phase in the composition of the present invention is not particularly limited, and may be, for example, 10 to 60 mass %, 20 to 50 mass %, or 22 to 30 mass % relative to the total mass of the composition.

[0039] ≪Optional ingredients≫ The water-in-oil emulsion composition of the present invention may contain optional ingredients that are usually used in cosmetics and the like, other than the above-mentioned essential ingredients. Optional components include, for example, oils such as macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, palm oil, liquid lanolin, hydrogenated coconut oil, hydrogenated oil, Japan wax, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, Ibota wax, lanolin, reduced lanolin, hard lanolin, jojoba wax, and other oils, waxes, liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum, microcrystalline wax, and other hydrocarbons; oleyl higher fatty acids such as oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and undecylenic acid; higher alcohols such as cetyl alcohol, stearyl alcohol, isostearyl alcohol, behenyl alcohol, octyldodecane, myristyl alcohol, and cetostearyl alcohol; cetyl isooctanoate, isopropyl myristate, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, diisostearyl malate, di-2-ethylhexyl oleate, diisostearyl ... Synthetic ester oils such as ethylene glycol dicaprate, neopentyl glycol dicaprate, glycerin di-2-heptylundecanoate, glycerin tri-2-ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, and pentane erythritol tetra-2-ethylhexanoate; linear polysiloxanes such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane (diphenylsiloxyphenyltrimethicone), and diphenylpolysiloxane; Oils such as silicone oils, including cyclic polysiloxanes such as cyclotetrasiloxane, decamethylcyclopentasiloxane (cyclopentasiloxane), and dodecamethylcyclohexanesiloxane, modified polysiloxanes such as hydrogen dimethicone, amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, and fluorine-modified polysiloxane; fatty acid soaps (sodium laurate, sodium palmitate, etc.); anionic surfactants such as potassium lauryl sulfate and alkyl sulfate triethanolamine ether;Cationic surfactants such as stearyl trimethylammonium chloride, benzalkonium chloride, laurylamine oxide, etc.; imidazoline-based amphoteric surfactants (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine-based surfactants (alkyl betaines, amido betaines, sulfobetaines, etc.), acyl methyl taurine, etc.; sorbitan fatty acid esters (sorbitan monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (glycerin monostearate, etc.), propylene glycol fatty acid esters (propylene monostearate, etc.) glycol, etc.), hydrogenated castor oil derivatives, glycerin alkyl ethers, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbit fatty acid esters (POE-sorbit monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE 2-octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonyl phenyl ether, etc.), pullulo; nonionic surfactants such as POE·POP alkyl ethers (POE·POP 2-decyltetradecyl ether, etc.), tetronics, POE castor oil / hydrogenated castor oil derivatives (POE castor oil, POE hydrogenated castor oil, etc.), sucrose fatty acid esters, and alkyl glucosides; polyether-modified silicones (PEG-9 polydimethylsiloxyethyl dimethicone, etc.), long-chain hydrocarbon group-containing polyether-modified silicones (lauryl PEG-9 polydimethylsiloxyethyl dimethicone, etc.), polyglycerin-modified silicones (poly Silicone surfactants such as polyglyceryl-3 polydimethylsiloxyethyl dimethicone, long-chain hydrocarbon group-containing polyglycerin-modified silicone (lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone, etc.), acrylic silicone resins (acrylates / dimethicone copolymers, etc.); moisturizing ingredients such as sodium pyrrolidone carboxylate, lactic acid, sodium lactate, isononyl isononanoate, etc.; mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, magnesium sulfate, silicic anhydride (which may be surface-treated). powders such as silica, aluminum oxide, etc.; inorganic white pigments (e.g., titanium oxide, titanium dioxide, zinc oxide, etc.), inorganic red pigments (e.g., iron oxide (red oxide), iron titanate, etc.), inorganic brown pigments (e.g., γ-iron oxide, etc.), inorganic yellow pigments (e.g., yellow iron oxide, yellow ocher, etc.), inorganic black pigments (e.g., black iron oxide, low-order titanium oxide, etc.), inorganic purple pigments (e.g., mango violet, cobalt violet, etc.), inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.), inorganic blue pigments ( inorganic pigments such as ultramarine, Prussian blue, etc.) and pearl pigments (for example, titanium dioxide coated mica, titanium dioxide coated bismuth oxychloride, titanium dioxide coated talc, colored titanium dioxide coated mica, bismuth oxychloride, fish scale foil, etc.); organic dyes such as Red No. 202, Red No. 228, Red No. 226, Yellow No. 4, Blue No. 404, Yellow No. 5, Red No. 505, Red No. 230, Red No. 223, Orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green No. 201, Purple No. 201, Red No. 204, etc., which may be laked;Organic powders such as polyethylene powder, polymethyl methacrylate, nylon powder, and silicone elastomers; organic modified clay minerals such as dimethyl distearyl ammonium chloride modified hectorite (distearyldimonium hectorite); water; lower alcohols such as ethanol and isopropanol; vitamin A or its derivatives, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or its derivatives, and vitamin B; 12 , Vitamin B 15or its derivatives; vitamin E such as α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E acetate, vitamin D, vitamin H, pantothenic acid, pantethine, pyrroloquinoline quinone, etc.; antibacterial agents such as methylparaben and phenoxyethanol; physiologically active ingredients such as whitening agents, cell activators, rough skin improving agents, blood circulation promoters, and skin astringents; cinnamic acid-based ultraviolet absorbers such as 2-ethylhexyl paramethoxycinnamate, isopropyl paramethoxycinnamate, diethanolamine salt of paramethoxyhydrocinnamate, glyceryl di-paramethoxycinnamate-mono-2-ethylhexanoate, octyl methoxycinnamate, and methyl diisopropylcinnamate; 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfuric acid, sodium 2-hydroxy-4-methoxybenzophenone-5-sulfate, 2,4-dihydroxybenzophenone, 2 ,2'-Dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone and other benzophenone-based ultraviolet absorbers, para-aminobenzoic acid, ethyl para-aminobenzoate, butyl para-aminobenzoate, 2-ethylhexyl para-dimethylaminobenzoate, glyceryl para-aminobenzoate, para-dimethylaminobenzoate, Benzoic acid-based ultraviolet absorbers such as octyl nobenzoate, amyl paraaminobenzoate, and diethylaminohydroxybenzoyl hexyl benzoate; salicylic acid-based ultraviolet absorbers such as 2-ethylhexyl salicylate, triethanolamine salicylate, homomenthyl salicylate, dipropylene glycol salicylate, methyl salicylate, ethylene glycol salicylate, phenyl salicylate, amyl salicylate, benzyl salicylate, isopropyl benzyl salicylate, and potassium salicylate; dibenzoylmethane-based ultraviolet absorbers such as 4-tert-butyl-4'-methoxydibenzoylmethane, 4-isopropyldibenzoylmethane, 4-methoxydibenzoylmethane, and 4-tert-butyl-4'-hydroxydibenzoylmethane; menthyl-O-aminobenzoate, 2-phenyl-benzimidazole-5-sulfuric acid, 2-phenyl-5-methylbenzoxazole, 3-(4-methylbenzylidene)camphor, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, 2-ethyl-2-cyano-3,3'-diphenylacrylate, 2-(2'-hydroxy-5-methylphenyl)benzotriazole, and anthranilic acid-based ultraviolet absorbers such as menthyl anthranilate; urocanic acid-based ultraviolet absorbers such as ethyl urocanate; bisethylhexyloxyphenol methoxide; UV absorbers such as triazine-based UV absorbers, e.g., phenyloxytriazine, ethylhexyltriazone, etc.; UV scattering agents such as fine particles of metal oxides, e.g., titanium oxide, titanium dioxide, zinc oxide, zirconium oxide, and cerium oxide; pH adjusters; polyhydric alcohols, e.g., polyethylene glycol, glycerin, 1,3-butylene glycol (BG), erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4-hexylene glycol, 1,2-hexanediol, and 1,2-octanediol; thickeners, e.g., carboxyvinyl polymers; emulsion stabilizers, e.g., polyglyceryl pentastearate, sodium stearoyl lactylate, etc.; solvents, e.g., benzene, toluene, and tetrahydrofuran, etc.

[0040] Specific applications of the water-in-oil emulsion composition of the present invention are not particularly limited, but examples thereof include sunscreens, external skin preparations such as liquid foundations, and cosmetics.

[0041] <Manufacturing method> One aspect of the present invention relates to a method for producing a water-in-oil emulsion composition (hereinafter, sometimes referred to as "a method for producing the water-in-oil emulsion composition of the present invention"), which comprises a step of mixing the above-mentioned essential components A) and B) of the water-in-oil emulsion composition of the present invention.

[0042] The method for producing the water-in-oil emulsion composition of the present invention is not particularly limited as long as it includes a step of mixing the essential components A) and B). The mixing method can be appropriately adopted from known methods used in the field of ordinary cosmetics, for example, adding a powder component containing component A) to an oil phase and a surfactant, and mixing and dispersing them. The emulsion composition can be obtained by adding a heated water phase to the oil phase, emulsifying, and cooling. EXAMPLES

[0043] The present invention will be specifically described below with reference to examples. However, these are merely illustrative of the present invention and the scope of the present invention is not limited to these examples.

[0044] <Example 1> According to the formulations shown in the table below, water-in-oil emulsion compositions (liquid foundations) of Examples and Comparative Examples were prepared. That is, the powder was added to the oil phase and surfactant whose temperature was adjusted to 80° C., and stirred with a disperser. The water phase whose temperature was adjusted to 80° C. was added to the oil phase, and then cooled to 30° C. to obtain a water-in-oil emulsion composition.

[0045] The following coating powders were used: Titanium oxide (coated with disodium stearoyl glutamate and trimethoxysilyl dimethicone): Product name SA / NAI-T-PFC-407 MiBrid Color (manufactured by Miyoshi Kasei Co., Ltd.) Iron oxide (coated with disodium stearoyl glutamate and trimethoxysilyl dimethicone): Product Name SA / NAI-Y-10 MiBrid Color, SA / NAI-R-10 MiBrid Color, SA / NAI-B-10 MiBrid Color( (Manufactured by Miyoshi Kasei Co., Ltd.) Titanium oxide (coated with trimethoxysilyl dimethicone): Product name SA-TR-10 (manufactured by Miyoshi Kasei Co., Ltd.) Iron oxide (coated with trimethoxysilyl dimethicone): Product names: SA-RPS-10, SA-YP-10, SA-BP-10 (manufactured by Miyoshi Kasei Co., Ltd.) Titanium oxide (coated with disodium stearoyl glutamate): Product name: NAI-TR-10 (Miyoshi Kasei Co., Ltd. Company) Iron oxide (coated with disodium stearoyl glutamate): Product names: NAI-RPS-10, NAI-YP-10, NAI-BP-10 (manufactured by Miyoshi Kasei Co., Ltd.) Stearic acid and trimethoxysilyl dimethicone coating was performed on PFC-407 (Ishihara Sangyo Kaisha), T-10, R-516-L, and BL-10 (Titanium Kogyo Co., Ltd.) (fatty acid coating rate 2% by mass, silicone compound coating rate 4% by mass).

[0046] The silicone elastomer surfactants used were as follows: (Dimethicone / (PEG-10 / 15)) Crosspolymer: Product name Silicone KSG210 (Shin-Etsu Silicone Co., Ltd.)

[0047] The water-in-oil emulsion compositions were evaluated as follows. The evaluation criteria and performance judgment criteria by the panel were as follows.

[0048] (Evaluation Criteria) Very good: 5 points Good: 4 points Average: 3 points Slightly poor: 2 points Defective: 1 point (Judgment criteria) Average score of 4.5 or above: ◎ Average score is between 3.5 and 4.5: ○ Average score is between 1.5 and 3.5: △ Average score less than 1.5: ×

[0049] <Freshness> Each composition was subjected to a practical use test by a cosmetics evaluation panel (10 people). Each panel member evaluated the "freshness" on a 5-point scale according to the above evaluation criteria. The average score was calculated and judged according to the above criteria.

[0050] <Uniformity of finish> Each composition was subjected to a practical use test by a panel of 10 cosmetic evaluation specialists. Each panelist rated the "uniformity of finish" on a 5-point scale according to the above-mentioned evaluation criteria. All panels The average score of the scores was calculated and judged according to the above criteria.

[0051] <Viscosity> At 25°C, a Brookfield viscometer (product name: DIGITAL VISMETORON VDA2 (manufactured by Shibaura Systems Co., Ltd.) was used. The measurements were performed using a rotor with a rotation speed of 6 rpm.

[0052] <Expansion> Each composition was subjected to a practical use test by a cosmetics evaluation panel (10 people). Each panel member evaluated the "spreadability" of the composition when applied on a 5-point scale according to the above-mentioned evaluation criteria. The average score of each test was calculated and judged according to the above criteria.

[0053] The evaluation results are shown in the table below.

[0054] [Table 1]

[0055] The water-in-oil emulsion composition of the present invention has good spreadability when applied and has excellent finish uniformity. , and had excellent freshness (Examples 1 to 6). Furthermore, when powder coated with an amino acid and a silicone compound was used, the spreadability and freshness upon application were even better (Examples 1 and 2). On the other hand, when powder coated with a silicone compound was blended (Comparative Example 1), the uniformity of the finish was insufficient, and the effect of the present invention could not be obtained. When no silicone elastomer surfactant was added (Comparative Examples 2 and 3), the uniformity of the finish and the freshness were insufficient. When the viscosity of this product was increased (Comparative Example 4), the uniformity of the finish and the freshness were improved, but the spreadability upon application was insufficient, and in either case the effects of the present invention could not be obtained. When powder coated with fatty acid was added (Comparative Example 5), the uniformity of the finished product was insufficient, and the effect of the present invention could not be obtained. [Industrial Applicability]

[0056] The present invention can be used in cosmetics and the like.

Claims

[Claim 1] A) a powder coated with at least an amino acid; and B) silicone elastomer type surfactant; A water-in-oil emulsion composition comprising:

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