Water-in-oil composition

Abstract

A water-in-oil composition comprises: (A) 0.02 to 0.25 mass% of a water-soluble polymer; (B) 0.2 to 2.5 mass% of at least one selected from the group consisting of sugars and sugar alcohols, which is solid at 25°C under atmospheric pressure; (C) water; (D) a first powder of which the particle surface is hydrophobic; (E) a second powder of which the particle surface is hydrophilic; and (F) an oily ingredient. The component (A) is at least one selected from the group consisting of polyacrylic acid, poly(2-acrylamido-2-methylpropanesulfonic acid), and salts thereof. The component (E) has an oil absorption amount of linseed oil at 25°C of 170 ml or less per 100 g.

Description

[0001] Related applications

[0002] This invention is based on the priority claim of Japanese Patent Application No. 2020-176847 (filed on October 21, 2020), the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to water-in-oil compositions. Background Technology

[0004] Water-in-oil compositions are used, for example, in topical skin agents such as sunscreen cosmetics (see, for example, Patent Document 1). Patent Document 1 describes a water-in-oil sunscreen cosmetic containing a mixture of volatile components, organically modified clay minerals, and spherical resin powder, but without ultraviolet absorbers.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 9-255544 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The following analysis is based on the viewpoint of this disclosure.

[0010] Sunscreen cosmetics contain substances that act as ultraviolet (UV) scattering agents. In such sunscreen cosmetics, a large amount of UV scattering agents is sometimes added to enhance UV protection. However, if an oil-in-water composition containing a high content of hydrophobic powders such as UV scattering agents is applied to the skin, the hydrophobic powders clump together on the skin during application, causing a rough feeling for the user. Therefore, to suppress this roughness, as in the oil-in-water sunscreen cosmetics described in Patent Document 1, highly oil-absorbing powders such as resin powders are sometimes added. However, in oil-in-water compositions where thickeners and humectants are mixed into the aqueous phase to create a moist feel, the presence of such highly oil-absorbing powders results in a thick and heavy spread during application.

[0011] Therefore, it is required that the oil-in-water composition does not feel rough due to the powder when applied to the skin, spreads easily, and leaves a moist feeling after application.

[0012] Methods for solving problems

[0013] According to a first aspect of this disclosure, an oil-in-water composition is provided, comprising: (A) 0.02% to 0.25% by mass of a water-soluble polymer; (B) 0.2% to 2.5% by mass of at least one selected from sugars and sugar alcohols, which is solid at atmospheric pressure and 25°C; (C) water; (D) a first powder with a hydrophobic particle surface; (E) a second powder with a hydrophilic particle surface; and (F) an oily component. Component (A) is at least one selected from polyacrylic acid, poly(2-acrylamide-2-methylpropanesulfonic acid), and their salts. Component (E) has an oil absorption capacity of less than 170 ml per 100 g of linseed oil at 25°C.

[0014] The effects of the invention

[0015] In the water-in-oil composition disclosed herein, the roughness caused by hydrophobic powder when applied to the skin can be suppressed. Furthermore, the water-in-oil composition of this disclosure can be spread easily. Therefore, the user can apply the water-in-oil composition with a comfortable feel. In addition, when the user applies the water-in-oil composition of this disclosure to the skin, the skin can feel moisturized. Detailed Implementation

[0016] The following describes the preferred methods for each of the above viewpoints.

[0017] According to the preferred embodiment of the first viewpoint above, component (D) is 2% to 20% by mass relative to the mass of the composition.

[0018] According to the preferred embodiment of the first viewpoint above, the component (E) is 1% to 5% by mass relative to the composition.

[0019] According to the preferred embodiment of the first viewpoint above, component (B) is selected from at least one of trehalose, xylitol, and erythritol.

[0020] According to the preferred embodiment of the first viewpoint above, component (D) is selected from at least one of hydrophobically treated titanium dioxide and hydrophobically treated zinc oxide.

[0021] According to the preferred embodiment of the first viewpoint above, component (E) is selected from at least one of silicon dioxide, corn starch, and cellulose.

[0022] According to the preferred embodiment of the first viewpoint above, component (F) comprises a liquid oily component and a UV absorber.

[0023] According to the preferred embodiment of the first viewpoint above, the weight-average molecular weight of component (A) is 500,000 to 8,000,000.

[0024] According to the preferred embodiment of the first viewpoint above, the resinous powder with an average particle size of 1 μm to 20 μm is 0.1% by mass or less relative to the composition.

[0025] According to the preferred embodiment of the first viewpoint above, the oil-in-water composition is applied to a topical skin agent.

[0026] In the following explanation, POE is short for polyethylene oxide, POP is short for polypropylene oxide, and the number in parentheses after POE or POP indicates the average number of POE or POP groups added to the compound.

[0027] In this disclosure, "effective mass" refers to the amount that produces the effect resulting from the addition of the compound.

[0028] [First Implementation]

[0029] The water-in-oil composition according to the first embodiment of this disclosure will be described. The water-in-oil composition according to the first embodiment comprises (A) a water-soluble polymer, (B) at least one selected from sugars and sugar alcohols that is solid at atmospheric pressure and 25°C, (C) water, (D) a first powder, (E) a second powder, and (F) an oily component. It can be considered that in the water-in-oil composition, at least a portion of component (A) and at least a portion of component (B) are encapsulated in an aqueous phase.

[0030] [(A) Water-soluble polymer]

[0031] Component (A) is selected from at least one of polyacrylic acid, poly(2-acrylamide-2-methylpropanesulfonic acid), and their salts. Hereinafter, polyacrylic acid and / or its salts are referred to as "polyacrylate".

[0032] Examples of salts that can be used as component (A) include, for example, alkali metal salts (such as sodium, potassium, magnesium, and calcium salts), organic amine salts (such as monoethanolamine, diethanolamine, triethanolamine, and triisopropanolamine), and salts of compounds containing basic nitrogen, such as 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-hydroxymethyl-1,3-propanediol, L-arginine, L-lysine, and L-alkyltaurine. Among these, monovalent alkali metal salts and organic amine salts are preferred, sodium, potassium, and triethanolamine salts are more preferred, and sodium salts are most preferred.

[0033] The weight-average molecular weight of component (A) can be, for example, 500,000 or more, 1 million or more, or 2 million or more. The weight-average molecular weight of component (A) can be, for example, less than 20 million, less than 15 million, less than 10 million, less than 8 million, or less than 5 million.

[0034] Component (A) may be a water-soluble polymer with controlled molecular weight (hereinafter referred to as "molecular weight controlled water-soluble polymer"). The weight-average molecular weight of the molecular weight controlled water-soluble polymer may be 500,000 or more. The weight-average molecular weight of the molecular weight controlled water-soluble polymer may be 8,000,000 or less. The molecular weight controlled water-soluble polymer is preferably a polymer with controlled molecular weight (distribution). Among the molecular weight controlled water-soluble polymers, polymers with a molecular weight of 10,000,000 or more are preferably 10% by mass or less of the total amount of water-soluble polymers. The main polymer chains of the molecular weight controlled water-soluble polymer are preferably linear. The molecular weight distribution (= weight-average molecular weight / number-average molecular weight) of the molecular weight controlled water-soluble polymer is preferably 2 or less, more preferably 1.8 or less. By controlling the molecular weight of the polymer, the uniformity of distribution of each component when the water-in-oil composition is applied to the skin can be further improved. Regarding the molecular weight controlled water-soluble polymer, the description in WO2015 / 052804 can be cited.

[0035] Molecular weight-controlled water-soluble polymers can be synthesized using known living polymerization methods. Examples of living polymerization include living anionic polymerization, living cationic polymerization, and living radical polymerization (precision radical polymerization, or controlled radical polymerization). Examples of living radical polymerization include polymerization via nitro oxygen, nitro oxygen-mediated radical polymerization (NLRP), atom transfer radical polymerization (ATRP), and reversible addition-fragmentation chain transfer (RAFT) polymerization. Examples of atom transfer radical polymerization (ATRP) include ATRP derived from electron transfer activators, or ATRP generated through electron transfer (AGET ATRP), ATRP derived from electron transfer regeneration activators, or ATRP regenerated through electron transfer (ARGET ATRP), ATRP for continuous regeneration of active species, or ATRP for stable regeneration of activators (ICAR ATRP), and reverse ATRP. As a derivative technique of reversible addition-fragmentation chain transfer (RAFT) polymerization, examples include living radical polymerization with organic tellurium as the growth terminator, or organic tellurium-mediated living radical polymerization (TERP), antimony-mediated living radical polymerization (SBRP), and bismuth-mediated living radical polymerization (BIRP). Other examples of living radical polymerization include iodine transfer radical polymerization (IRP) and cobalt-mediated radical polymerization (CMRP). Among these, reversible addition-fragmentation chain transfer polymerization (RAFT polymerization) is more preferred for the synthesis of high molecular weight compounds with narrow molecular weight distributions. The chain transfer agent is preferably dithiolated or trithiolated. The polymerization initiator preferably has a chemical structure similar to the chain transfer agent, and is preferably an azo initiator. The polymerization solvent is not particularly limited; a substance with high solubility in the monomer and polymer should be appropriately selected. Polymerization time is suitable from several hours to approximately 100 hours.

[0036] Regarding the molecular weight of component (A), the weight-average molecular weight can be determined by light scattering, ultracentrifugation, chromatography, etc., while the number-average molecular weight can be determined by known methods such as osmotic pressure analysis, chromatography, etc. Among these methods, chromatography is preferred in terms of being able to easily obtain the weight-average molecular weight, number-average molecular weight, and molecular weight distribution with a small amount of sample. Furthermore, gel permeation chromatography (hereinafter referred to as GPC) is suitable. The molecular weight distribution can be expressed by dividing the weight-average molecular weight obtained by GPC analysis by the number-average molecular weight.

[0037] Component (A) is preferably 0.02% by mass or more relative to the water-in-oil composition. Component (A) may be 0.05% by mass or more, 0.1% by mass or more, 0.12% by mass or more, or 0.15% by mass or more relative to the water-in-oil composition. If component (A) is less than 0.02% by mass, the user experience when applied to the skin will not be improved. Component (A) is preferably 0.25% by mass or less relative to the water-in-oil composition. Component (A) may be 0.22% by mass or less, 0.2% by mass or less, 0.15% by mass or less, or 0.1% by mass or less relative to the water-in-oil composition. If component (A) exceeds 0.25% by mass, the user experience when applied to the skin will be reduced.

[0038] (B) Sugars and / or sugar alcohols

[0039] Sugars and / or sugar alcohols are solids at atmospheric pressure and 25°C. In this disclosure, "solid" refers to a substance that remains solid at atmospheric pressure and 25°C. In this disclosure, "liquid" refers to a substance that is fluid at atmospheric pressure and 25°C (a liquid substance).

[0040] Examples of sugars include trehalose.

[0041] Examples of sugar alcohols include xylitol and erythritol.

[0042] The component (B) is preferably 0.2% by mass or more relative to the mass of the water-in-oil composition. The component (B) may be 0.5% by mass or more, 1% by mass or more, 1.2% by mass or more, or 1.5% by mass or more relative to the mass of the water-in-oil composition. If the component (B) is less than 0.2% by mass, the user experience when applied to the skin will not be improved. The component (B) is preferably 2.5% by mass or less relative to the mass of the water-in-oil composition. The component (B) may be 2.2% by mass or less, 2% by mass or less, 1.5% by mass or less, or 1% by mass or less relative to the mass of the water-in-oil composition. If the component (B) exceeds 2.5% by mass, the user experience when applied to the skin will be reduced.

[0043] [(C) Water]

[0044] As water, it can be the water used in cosmetics, pharmaceuticals, etc., such as purified water, ion-exchanged water, tap water, etc.

[0045] The mass of component (C) relative to the water-in-oil composition can be 10% or more by mass, 15% or more by mass, 20% or more by mass, 25% or more by mass, 30% or more by mass, 35% or more by mass, 40% or more by mass, or 45% or more by mass. The mass of component (C) relative to the water-in-oil composition can be less than 60% by mass, less than 55% by mass, less than 50% by mass, less than 45% by mass, less than 40% by mass, less than 35% by mass, less than 30% by mass, less than 25% by mass, or less than 20% by mass.

[0046] [(D) Powder 1]

[0047] The first powder is a powder with a hydrophobic particle surface. The first powder may also contain powder whose particle surface has been hydrophobically treated. It can be considered that the first powder exists in the oil phase (external phase) of the water-in-oil composition. Examples of hydrophobic treatment methods include coating the powder with silicone resin, fatty acid, etc. The first powder may, for example, be a powder of a metal oxide that has undergone hydrophobic treatment. The metal oxide may, for example, be a powder that functions as an ultraviolet scattering agent. Examples of metal oxides include zinc oxide and titanium oxide.

[0048] The first powder preferably has an average particle size of primary particles of 5 nm or more. The first powder preferably has an average particle size of primary particles of 50 nm or less.

[0049] The average particle size of the primary particles of the first powder can be determined using dynamic light scattering.

[0050] The oil absorption of the first powder at 25°C relative to 100g of the first powder is less than 170ml. The oil absorption of flaxseed oil can be determined according to JIS K5101-13-2 (Boiled Flaxseed Oil Method).

[0051] The content of component (D) relative to the mass of the water-in-oil composition is preferably 2% by mass or more, more preferably 4% by mass or more. The content of component (D) relative to the mass of the water-in-oil composition can be 6% by mass or more, 8% by mass or more, 10% by mass or more, or 12% by mass or more. If component (D) is a UV-scattering agent, sufficient UV protection effect cannot be obtained if component (D) is less than 2% by mass. The content of component (D) relative to the mass of the water-in-oil composition is preferably 20% by mass or less. The content of component (D) relative to the mass of the water-in-oil composition can be 18% by mass or less, 16% by mass or less, 14% by mass or less, 12% by mass or less, or 10% by mass or less. If component (D) exceeds 20% by mass, a powdery or gritty feeling may occur when applied to the skin.

[0052] The term "roughness" in this disclosure refers to the tactile sensation of applying the composition to the skin without smoothness. Users begin to experience roughness after application, and this roughness can increase over time. Roughness caused by powder is referred to as a powdery or gritty feel.

[0053] [(E) Second Powder]

[0054] The second powder is a powder with a hydrophilic particle surface. The second powder may also contain powder whose particle surface has been hydrophilized.

[0055] The oil absorption of the second powder relative to 100g of flaxseed oil at 25°C can be less than 170ml. The oil absorption of flaxseed oil can be determined according to JIS K5101-13-2 (Boiled Flaxseed Oil Method).

[0056] As a second powder, materials such as silica, corn starch, and cellulose can be used.

[0057] The second powder preferably has an average particle size of primary particles of 0.5 nm or more. The second powder preferably has an average particle size of primary particles of 50 nm or less.

[0058] The average particle size of the primary particles in the second powder can be determined using dynamic light scattering.

[0059] The component (E) relative to the mass of the water-in-oil composition is preferably 1% by mass or more. The component (E) relative to the mass of the water-in-oil composition can be 1.5% by mass or more. If the component (E) is less than 1% by mass, the user experience cannot be improved. The component (E) relative to the mass of the water-in-oil composition is preferably 5% by mass or less. The component (E) relative to the mass of the water-in-oil composition can be 4% by mass or less, 3% by mass or less, or 2.5% by mass or less. If the component (E) exceeds 5% by mass, the dispersibility of the second powder deteriorates.

[0060] [(F) Oily components]

[0061] The oily component preferably comprises a liquid oily component. The liquid oily component preferably comprises at least one selected from liquid hydrocarbon oils, liquid ester oils, liquid higher alcohols, and liquid silicone oils. The oily component may contain an oil-soluble UV absorber. When the oily component contains an oil-soluble UV absorber, the liquid oily component preferably has compatibility with the oil-soluble UV absorber.

[0062] Examples of hydrocarbon oils include liquid paraffin, ceresin, squalane, pterostilbene, paraffin wax, pure ceresin, squalene, isododecane, isohexadecane, hydrogenated polydecene, and mineral oil.

[0063] Examples of synthetic ester oils include isopropyl myristate, cetyl octanoate, octyl dodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyl octanoate, cetyl lactate, myristyl lactate, acetylated lanolin, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, pentaerythritol fatty acid ester, N-alkyl diol monoisostearate, neopentyl glycol didecanoate, diisostearyl malate, glyceryl di-2-heptyl undecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, and pentaerythritol tetra-2-ethylhexanoate. Tri-2-ethylhexanoate, tricaprylic acid glyceride, triisopalmitoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, trimyristic acid glyceride, tri-2-heptylundecanoate, castor oil fatty acid methyl ester, oleic acid oleate, acetylglycine ester, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl adipate, 2-ethylhexyl succinate, triethyl citrate, etc.

[0064] As higher alcohols, examples include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, betaine alcohol, myristyl alcohol, oleyl alcohol, a mixture of hexadecyl alcohol and octadecyl alcohol, etc.); branched-chain alcohols (e.g., monostearate glyceryl ether (squalene), 2-decyltetradecyne alcohol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanool, isostearyl alcohol, octyldodecanool, etc.).

[0065] Examples of silicone oils include dimethyl polysiloxane, methyl hydrogen polysiloxane, methyl phenyl polysiloxane, stearoxymethyl polysiloxane, polyether-modified organopolysiloxane, fluoroalkyl / polyoxyalkylene co-modified organopolysiloxane, alkyl-modified organopolysiloxane, terminal-modified organopolysiloxane, fluorinated organopolysiloxane, amino-modified organopolysiloxane, organosilicon gel, acrylic organosilicon, trimethylsiloxysilicic acid, organosilicon RTV rubber, cyclic pentasiloxane, and other organosilicon compounds.

[0066] Examples of oil-soluble ultraviolet absorbers include, for example, benzoic acid-based ultraviolet absorbers (e.g., para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglyceride, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, diethylaminohydroxybenzoyl benzoate hexyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homonyl-N-acetyl anthranilic ester, etc.); salicylic acid-based ultraviolet absorbers (e.g., ethylhexyl salicylate, pentyl salicylate, menthyl salicylate, homonyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, humosalicylate, etc.); cinnamon Acidic UV absorbers (e.g., octyl methoxycinnamate, ethyl 4-isopropylcinnamate, methyl 2,5-diisopropylcinnamate, ethyl 2,4-diisopropylcinnamate, methyl 2,4-diisopropylcinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate (2-ethylhexyl p-methoxycinnamate, methoxycinnamate...) ethylhexyl methoxycinnamate, 2-ethoxyethyl p-methoxycinnamate, cyclohexyl p-methoxycinnamate, ethyl α-cyano-β-phenylcinnamate, 2-ethylhexyl α-cyano-β-phenylcinnamate, mono-2-ethylhexanoyl-di-p-methoxycinnamate, etc.; 3-(4'-methylbenzyl)-d,l-camphor, 3-benzyl-d,l-camphor; 2-phenyl-5-methylbenzo[…] Azazole; 2,2'-hydroxy-5-methylphenylbenzotriazole; 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenylbenzotriazole; dibenzylazine; dianiloylmethane; 4-methoxy-4'-tert-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornyl)-3-pentane-2-one, dimorpholinopyridazinone; 2-ethylhexyl-2-cyano-3,3-diphenylacrylate (octocrylene); 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-(1,3,5-) - Triazine and benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octyloxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.) etc.

[0067] The mass of component (F) relative to the water-in-oil composition can be 20% or more by mass, 25% or more by mass, 30% or more by mass, or 35% or more by mass. The mass of component (F) relative to the water-in-oil composition can be less than 60% by mass, less than 55% by mass, less than 50% by mass, less than 45% by mass, less than 40% by mass, less than 35% by mass, or less than 30% by mass.

[0068] [(G) surfactant]

[0069] The water-in-oil composition according to the first embodiment may further include a surfactant. There is no limitation on the surfactant as long as it is a substance capable of emulsifying an aqueous phase. Examples of surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, hydrophilic nonionic surfactants, and lipophilic nonionic surfactants. When the water-in-oil composition is applied to the skin and not washed off, a nonionic surfactant is preferred.

[0070] As anionic surfactants, examples include fatty acid soaps (e.g., sodium lauryl ether sulfate, sodium palmitate, etc.); higher alkyl sulfates (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfates (e.g., POE-triethanolamine lauryl ether sulfate, sodium POE-lauryl ether sulfate, sodium lauryl ether sulfate, etc.); N-acylsarcosine (e.g., sodium lauroyl sarcosine, etc.); higher fatty acid amide sulfonates (e.g., sodium N-stearoyl-N-methyl taurate, sodium N-myristoyl-N-methyl taurate, sodium cocoyl methyl taurate, sodium lauryl methyl taurate, etc.); phosphates (POE-oleyl ether phosphate, POE-stearoyl ether phosphate, etc.); and sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, monolauroyl monoethanolamide polysulfonate, etc.). Sodium oxyethylene sulfosuccinate, sodium lauryl polypropylene glycol sulfosuccinate, etc.; alkylbenzene sulfonates (e.g., linear dodecylbenzene sulfonate, linear dodecylbenzene sulfonate triethanolamine, linear dodecylbenzene sulfonic acid, etc.); higher fatty acid ester sulfates (e.g., hydrogenated coconut oil fatty acid glycerol sulfate sodium salt, etc.); N-acylglutamate salts (e.g., N-lauroyl glutamate monosodium, N-stearoyl glutamate disodium, N-myristoyl-L-glutamate monosodium, etc.); sulfated oils (e.g., Turkish red oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylates; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkanolamide sulfates; lauroyl monoethanolamide succinate; N-palmitoyl aspartate di(triethanolamine); sodium casein, etc.

[0071] Examples of cationic surfactants include, for example, alkyl trimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.); alkylpyridines Salts (e.g., cetylpyridine chloride) (etc.); dialkyl dimethylammonium salts (e.g., distearate dimethylammonium chloride); poly(N,N'-dimethyl-3,5-methylenepiperidine) chloride ); alkyl quaternary ammonium salts; alkyl dimethyl benzyl ammonium salts; alkyl isoquinoline Salt; dialkylmorpholine Salts; POE-alkylamines; alkylamine salts; polyamine fatty acid derivatives; pentanol fatty acid derivatives; benzalkonium chloride; benzyl chloride, etc.

[0072] Examples of amphoteric surfactants include, for instance, imidazoline-based amphoteric surfactants (e.g., sodium 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline, 2-cocoyl-2-imidazoline). Hydroxide-1-carboxyethoxy disodium salt, etc.; betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazoline). Betaine, lauryl dimethyl aminoacetic acid betaine, alkyl betaine, amide betaine, sulfobetaine, etc.

[0073] Examples of hydrophilic nonionic surfactants include, for example, POE-sorbitol fatty acid esters (e.g., POE-sorbitol monooleate, POE-sorbitol monostearate, POE-sorbitol monooleate, POE-sorbitol tetraoleate, etc.); POE-sorbitol fatty acid esters (e.g., POE-sorbitol monolaurate, POE-sorbitol monooleate, POE-sorbitol pentaoleate, POE-sorbitol monostearate, etc.); POE-glycerides. Fatty acid esters (e.g., POE-glyceryl monostearate, POE-glyceryl monoisostearate, POE-glyceryl triisostearate, etc., POE-monoleic acid esters, etc.); POE-fatty acid esters (e.g., POE-distearate, POE-monodioleate, ethylene distearate, etc.); POE-alkyl ethers (e.g., POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-betaine, POE-2-octyldodecyl ether, POE-cholestanol ether, etc.); poloxamer type (e.g., POE-glyceryl monostearate, POE-isostearate, POE-carboxyl ether, POE-carboxyl ether, etc.); Luronic (registered trademark, etc.); POE / POP-alkyl ethers (e.g., POE / POP-cetyl ether, POE / POP-2-decyltetradecyl ether, POE / POP-monobutyl ether, POE / POP-hydrogenated lanolin, POE / POP-glycerol ether, etc.); tetraPOE / tetraPOP-ethylenediamine condensates (e.g., Tetronic, etc.); POE-caster oil hydrogenated castor oil derivatives (e.g., POE-caster oil, POE-hydrogenated castor oil, POE-hydrogenated castor oil monoisostearin). Esters, POE-hydrogenated castor oil triisostearate, POE-hydrogenated castor oil monopyroglutamic acid monoisostearate, POE-hydrogenated castor oil maleic acid, etc.; POE-beeswax / lanolin derivatives (e.g., POE-sorbitol beeswax, etc.); alkanolamides (e.g., coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, etc.); POE-propylene glycol fatty acid esters; POE-alkylamines; POE-fatty acid amides; sucrose fatty acid esters; alkylethoxydimethylamine oxide; trioleophosphate, etc.

[0074] Examples of lipophilic nonionic surfactants include, for example, sorbitol fatty acid esters (e.g., sorbitol monooleate, sorbitol monoisostearate, sorbitol monolaurate, sorbitol monopalmitate, sorbitol monostearate, sorbitol sesquioleate, sorbitol trioleate, sorbitol penta-2-ethylhexyl diglyceride, sorbitol tetra-2-ethylhexyl diglyceride, etc.); glycerol polyglycerol fatty acids (e.g., cottonseed oil fatty acid glycerides, glycerol monoerucic acid, glycerol sesquioleate, glycerol monostearate, glycerol α,α'-oleic acid pyroglutamic acid glyceride, glycerol monostearate malic acid, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; glycerol alkyl ethers, etc.

[0075] The surfactant, for example, may be 0.2% by mass or more, 0.5% by mass or more, or 1% by mass or more, relative to the mass of the water-in-oil composition. The surfactant, for example, may be 7% by mass or less, 5% by mass or less, 3% by mass or less, or 2% by mass or less, relative to the mass of the water-in-oil composition.

[0076] [(H) Other]

[0077] The water-in-oil composition disclosed herein may contain other ingredients as needed, without impairing the effects of the present disclosure, such as alcohols, powders other than those mentioned above, oily components other than those mentioned above, thickeners, moisturizers, film-forming agents, water-soluble ultraviolet absorbers, metal ion blocking agents, amino acids, organic amines, polymeric emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant auxiliaries, fragrances, etc.

[0078] As a water-soluble alcohol, examples include at least one selected from lower alcohols, polyols, polyol polymers, dialkyl alcohol ethers, dialkyl alcohol ethers, dialkyl alcohol esters, glycerol monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides and their derivatives.

[0079] Examples of lower alcohols include ethanol, propanol, isopropanol, isobutanol, and tert-butanol.

[0080] Examples of polyols include, for example, diols (e.g., ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 2-buten-1,4-diol, 1,6-hexanediol, 1,8-octanediol, 1,2-hexanediol, etc.); triols (e.g., glycerol, trimethylolpropane, etc.); tetraols (e.g., pentaerythritol, 1,2,6-hexanetriol, etc.); pentaols (e.g., xylitol, etc.); hexaols (e.g., sorbitol, mannitol, etc.); and polyol polymerization. Substances (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerol, polyethylene glycol, triglycerol, tetraglycerol, polyglycerol, etc.); sugar alcohols (e.g., sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch-degrading sugar, maltose, xylitol, starch-degrading sugar reducing alcohol, etc.); glycolide; tetrahydrofurfuryl alcohol; POE-tetrahydrofurfuryl alcohol; POP-butyl ether; POP / POE-butyl ether; trimeroxypropylene glycerol ether; POP-glycerol ether; POP-glycerol ether phosphate; POP / POE-pentaerythritol ether, polyglycerol, etc.

[0081] Examples of monosaccharides include, for example, trioses (e.g., D-glyceraldehyde, dihydroxyacetone, etc.), tetraoses (e.g., D-erythrose, D-erythulose, D-threose, erythritol, etc.), pentoses (e.g., L-arabinose, D-xylose, L-lythose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.), and hexoses (e.g., D-glucose, D-tarose, D-alulose, D-galactose, D-fructose, L-galactose, L-mannose). At least one of the following: D-tagatose, heptose (e.g., heptanose, heptanose), octose (e.g., octanose), deoxyglucose (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose), aminoglucose (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid), and uronic acid (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid).

[0082] As oligosaccharides, examples include at least one selected from sucrose, gentiotriose, umbelliferose, lactose, psyllium triose, isocorhizose, α,α-trehalose, raffinose, succinose, lecithin, stachyose, and mustachyose.

[0083] Examples of polysaccharides include, for instance, at least one selected from cellulose, quince seed, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, tragacanth gum, keratin sulfate, chondroitin, xanthate gum, mucin sulfate, guar gum, dextran, keratin sulfate, locust bean gum, succinyl polysaccharide, carnosic acid, etc.

[0084] Other polyols include, for example, at least one selected from polyoxyethylene methyl glucoside (Glucame E-10), polyoxypropylene methyl glucoside (Glucame P-10), etc.

[0085] As powders, for example, inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, red mica, biotite, lepidolite, calcined mica, calcined talc, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, tungstate metal salts, magnesium, silicon dioxide, fumed silica, zeolite, glass, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powders, metal soaps (e.g., zinc myristate, calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (For example, polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, silicone resin powder, silk powder, wool powder, urethane powder, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (iron oxide red), iron titanate, etc.); inorganic brown pigments (γ-iron oxide, etc.), inorganic yellow pigments (iron oxide yellow, loess, etc.), inorganic black pigments (iron oxide black, carbon black, etc.). Low-cost titanium dioxide, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, navy blue, etc.); pearlescent pigments (e.g., titanium dioxide coated with mica, titanium dioxide coated with bismuth oxychloride, titanium dioxide coated with talc, colored titanium dioxide coated with mica, bismuth oxychloride, fish scale foil, etc.); metallic powder pigments (e.g., aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium, or aluminum lake (e.g., Red 201, Red 202, Red 204, Red 205, Red 220, Red 226, etc.). Organic pigments such as No. 228, No. 405, No. 203, No. 204, No. 205, No. 401, and No. 404; No. 3, No. 104, No. 106, No. 227, No. 230, No. 401, No. 505, No. 205, No. 4, No. 5, No. 202, No. 203, No. 3, and No. 1; natural pigments (e.g., chlorophyll, β-carotene); wax powders (e.g., carnauba wax powder); starch powders (e.g., corn starch powder, rice starch powder), etc.

[0086] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, insect wax, lignite wax, rice bran wax, kapok wax, sugarcane wax, hexyl laurate, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE cholesterol ether, POE hydrogenated lanolin alcohol ether, liquid paraffin, ceresin, squalane, pterostilbene, paraffin wax, pure ceresin, squalene, microcrystalline wax, Fischer-Tropsch wax, etc.

[0087] Examples of liquid oils include avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, peach kernel oil, wheat germ oil, camellia oil, castor oil, flaxseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, torreya nut oil, rice bran oil, white tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerides.

[0088] Examples of solid fats include cocoa butter, coconut oil, hydrogenated coconut oil, palm oil, palm kernel oil, sesame kernel oil, hydrogenated oil, sesame kernel oil, hydrogenated oil, sesame wax, and hydrogenated castor oil.

[0089] Examples of high-grade fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, benzolic acid, oleic acid, undecenoic acid, tall oil, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0090] Examples of lipophilic nonionic surfactants include, for example, sorbitol fatty acid esters (e.g., sorbitol monooleate, sorbitol monoisostearate, sorbitol monolaurate, sorbitol monopalmitate, sorbitol monostearate, sorbitol sesquioleate, sorbitol trioleate, sorbitol penta-2-ethylhexyl diglyceride, sorbitol tetra-2-ethylhexyl diglyceride, etc.); glycerol polyglycerol fatty acids (e.g., cottonseed oil fatty acid glycerides, glycerol monoerucic acid, glycerol sesquioleate, glycerol monostearate, glycerol α,α'-oleic acid pyroglutamic acid glyceride, glycerol monostearate malic acid, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; glycerol alkyl ethers, etc.

[0091] Examples of natural water-soluble polymers include, for example, plant-based polymers (e.g., gum arabic, tragacanth, galactan, guar gum, carob gum, ebony gum, carrageenan, pectin, agar, quince seeds (quince), seaweed extract (brown algae extract), starch (rice, corn, potato, wheat), glycyrrhizic acid); and microbial polymers (e.g., xanthate gum, dextran, succinosaccharide, pullulan, etc.).

[0092] Examples of semi-synthetic water-soluble polymers include, for example, starch-based polymers (e.g., carboxymethyl starch, methyl hydroxypropyl starch, etc.); cellulose-based polymers (methyl cellulose, ethyl cellulose, methyl hydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, etc.); and alginate-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

[0093] Examples of thickeners include gum arabic, carrageenan, ebony gum, tragacanth gum, carob gum, quince seeds, casein, dextrin, gelatin, sodium pectate, sodium alginate, methylcellulose, ethylcellulose, carboxymethylcellulose (CMC), hydroxyethylcellulose, hydroxypropylcellulose, polyvinyl alcohol (PVA), polyvinyl methyl ether (PVM), PVP (polyvinylpyrrolidone), sodium polyacrylate, carboxyvinyl polymers, locust bean gum, guar gum, tamarind gum, dialkyl dimethyl ammonium sulfate cellulose, xanthate gum, magnesium aluminum silicate, bentonite, lithium montmorillonite, magnesium aluminum silicate (Veegum), synthetic clay (laponite), silicic anhydride, taurine-based synthetic polymers, and acrylate-based synthetic polymers.

[0094] Examples of moisturizers include polyethylene glycol, propylene glycol, glycerin, 1,3-butanediol, xylitol, sorbitol, maltitol, diglyceride (EO)PO adduct, silk flower extract, yarrow extract, and sweet osmanthus extract.

[0095] Examples of film-forming agents include, for example, high molecular weight silicone, silicone resin, trimethylsiloxysilicic acid, etc.

[0096] Examples of water-soluble ultraviolet absorbers include benzophenone-based ultraviolet absorbers (e.g., 2-hydroxy-4-methoxybenzophenone-5-sulfonate), benzyl camphor-based ultraviolet absorbers (benzylidene camphor sulfonic acid, terephthalimide dicamphor sulfonic acid, etc.), and phenylbenzimidazole-based ultraviolet absorbers (phenylbenzimidazole sulfonic acid, etc.).

[0097] Examples of metal ion blocking agents include, for example, 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonic acid, disodium ethylenediaminetetraacetate, trisodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, ethylenediaminetetraacetic acid, and trisodium ethylenediaminehydroxyethyltriacetate.

[0098] Examples of amino acids include, for example, neutral amino acids (e.g., threonine, cysteine, etc.) and basic amino acids (e.g., hydroxylysine, etc.). Furthermore, examples of amino acid derivatives include, for example, sodium lauroyl sarcosinate (sodium lauroyl sarcosinate), acyl glutamate, sodium acyl β-alanine, glutathione, and pyrrolidone carboxylic acid.

[0099] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0100] Examples of polymeric emulsions include acrylic resin emulsions, ethyl polyacrylate emulsions, acrylic resin liquids, alkyl polyacrylate emulsions, polyvinyl acetate resin emulsions, and natural rubber latex.

[0101] Examples of pH buffers include, for example, lactic acid-sodium lactate, citrate-sodium citrate, and succinic acid-sodium succinate.

[0102] Examples of vitamins include vitamins A, B1, B2, B6, C, E and their derivatives, pantothenic acid and its derivatives, biotin, etc.

[0103] Examples of antioxidants include tocopherols, butylated hydroxytoluene, butylated hydroxyanisole, and gallic acid esters.

[0104] Examples of antioxidant auxiliaries include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, phospholipids, hexametaphosphate, inositol hexaphosphate, and ethylenediaminetetraacetic acid.

[0105] Other ingredients that can be mixed include, for example, preservatives (ethylparaben, butylparaben, chlorphenesin, phenoxyethanol, etc.); anti-inflammatory agents (e.g., glycyrrhizic acid derivatives, glycyrrhetinic acid derivatives, salicylic acid derivatives, physalisol, zinc oxide, allantoin, etc.); whitening agents (e.g., placental extract, saxifrage extract, arbutin, etc.); and various extracts (e.g., Phellodendron bark, Coptis root, Lithospermum root, peony root, Angelica dahurica, birch, sage, loquat, carrot, aloe vera, mallow, iris, grape, coix seed, loofah, lily bulb, saffron, Ligusticum chuanxiong, ginger, Forsythia suspensa, etc.). Ingredients include: * *Rhizophora stylosa*, garlic, chili pepper, dried tangerine peel, angelica, seaweed, etc.*; activators (e.g., royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (e.g., vanillin nonanoic acid, benzyl nicotinate, β-butoxyethyl nicotinate, capsaicin, gingerone, cantharides tincture, ichthammol, tannic acid, α-borneol, tocopheryl nicotinate, inositol hexanicotinate, cyclomansyl ester, cinnarizine, tolazoline, acetylcholine, verapamil, sennae, γ-oryzanol, etc.); anti-seborrheic agents (e.g., sulfur, dimethylthiazide, etc.); anti-inflammatory agents (e.g., tranexamic acid, thiotaurine, linolenic acid, etc.).

[0106] Furthermore, the compositions disclosed herein may also appropriately contain caffeine, tannins, verapamil, tranexamic acid and its derivatives, various herbal extracts such as licorice, papaya, and Japanese deer hoof grass, tocopheryl acetate, glycyrrhizic acid, glycyrrhizic acid and its derivatives or salts thereof, vitamin C, magnesium ascorbate phosphate, ascorbate glucoside, arbutin, kojic acid and other whitening agents, amino acids such as arginine and lysine and their derivatives, and glucosyl hesperidin.

[0107] [Resinous powder]

[0108] In the water-in-oil composition disclosed herein, the resinous powder with an average particle size of 1 μm to 20 μm is preferably 0.1% by mass or less relative to the composition, and more preferably, it does not contain any effective mass (0% by mass) in the composition. If the resinous powder exceeds 0.1% by mass, the spread during application becomes thick and heavy. The resinous powder is a powder that absorbs more than 170 ml of linseed oil per 100 g of resinous powder.

[0109] [Manufacturing Method]

[0110] A method for manufacturing the water-in-oil composition of this disclosure will be described. The water-in-oil composition of this disclosure can be manufactured by known methods. For example, the manufacturing method may include: a step of mixing components (A), (B), (C), and (E) to prepare an aqueous phase; and a step of emulsifying the aqueous phase in an oil phase containing components (D) and (F) using a surfactant.

[0111] In the water-in-oil compositions of this disclosure, there are times when the phase structure, emulsion morphology, etc., are difficult or impractical to specify directly through the composition. In such cases, the water-in-oil compositions of this disclosure should be allowed to be specified through their manufacturing methods.

[0112] In the water-in-oil composition disclosed herein, by adding a water-soluble polymer that acts as a thickener and a sugar / sugar alcohol that acts as a moisturizer to the aqueous phase, the user can obtain a moisturizing sensation after application to the skin. Furthermore, the water-soluble polymer and sugar / sugar alcohol prevent the aggregation of hydrophobic powders on the skin during application without adding highly oil-absorbing powders. This suppresses the occurrence of roughness during application, providing a comfortable application experience. Moreover, since highly oil-absorbing powders are not mixed in, a light and easy-to-spread application feel can be achieved.

[0113] The water-in-oil compositions disclosed herein can be used, for example, in topical skin agents. These compositions can also be used in base makeup, top makeup, color cosmetics, antiperspirants, deodorants, sunscreens, skin care products, and cleansing agents.

[0114] Example

[0115] The following examples illustrate the water-in-oil compositions of this disclosure. However, the water-in-oil compositions of this disclosure are not limited to the examples below. The content of each component shown in the tables is in mass%.

[0116] [Experimental Examples 1-23]

[0117] The following water-in-oil topical skin composition (sunscreen cosmetic) was prepared, and the moisturizing sensation after application to the skin was evaluated. The evaluation methods and criteria for each test item are shown below.

[0118] [The moisturizing feeling after application]

[0119] Ten professional reviewers evaluated whether the sample felt moist after being applied to the wrist. They also evaluated the presence or absence of roughness during application and the lightness and spreadability of the sample. The evaluation was conducted by comparison with the composition of Test Example 1, which used a cross-linked polymer powder (vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane) that was a highly oil-absorbent powder. Each evaluation item was assessed according to the number of reviewers.

[0120] A: There are at least 7 reviewers who feel that the composition is equivalent to or better than that of Example 1;

[0121] B: There are 4 to 6 reviewers who feel that the composition is equivalent to or better than that of Experimental Example 1;

[0122] C: There are no more than 3 reviewers who feel that the composition is equivalent to or better than that of Example 1.

[0123] [Experimental Examples 1-9]

[0124] In Test Examples 1–9, the differences in user experience caused by the presence or absence of (A) polyacrylic acid and / or its salts, and / or (B) sugars and / or sugar alcohols were tested. The composition and evaluation of each composition are shown in Tables 1 and 2.

[0125] In Test Examples 4-7, where at least one of Ingredients (A) and (B) was not added, and in Test Examples 8 and 9, where the second powder (E), which has low oil absorption, was not added, all evaluation items received lower scores. On the other hand, in Test Examples 2 and 3, which included Ingredients (A), (B), and (E), more reviewers reported a moisturizing sensation. Furthermore, many reviewers did not experience any roughness when applying the product, and could clearly feel its light and easy-to-spread texture.

[0126] [Table 1]

[0127]

[0128] [Table 2]

[0129]

[0130] [Experimental Examples 10-12]

[0131] In Test Examples 10–12, other water-soluble polymers (thickeners) were added instead of component (A). Table 3 shows the composition and evaluation of each composition.

[0132] For water-soluble polymers that are different from polyacrylates, none of the evaluation criteria can be improved.

[0133] [Table 3]

[0134]

[0135] [Experimental Examples 13-17]

[0136] In Test Examples 13–17, other moisturizing ingredients were added as substitutes for ingredient (B). Table 4 shows the composition and evaluation of each composition.

[0137] In Test Examples 13 and 14, where sugar alcohols were added as ingredient (B), all evaluation items showed improved scores. On the other hand, in Test Examples 15–17, where moisturizing ingredients other than sugar and sugar alcohols were added instead of ingredient (B), all evaluation items showed decreased scores.

[0138] [Table 4]

[0139]

[0140] [Experimental Examples 18-21]

[0141] In Experiments 18–21, experiments were conducted by varying the content of components (A) and (B). Table 5 shows the composition and evaluation of each composition.

[0142] Comparing Test Example 18 with Test Example 19, it can be considered that component (A) is preferably 0.25% by mass or less relative to the composition. Comparing Test Example 20 with Test Example 21, it can be considered that component (B) is preferably 2.5% by mass or less relative to the composition.

[0143] [Table 5]

[0144]

[0145] [Experimental Examples 22-23]

[0146] In Experiments 22 and 23, experiments were conducted by changing the molecular weight and type of component (A). Table 6 shows the composition and evaluation of each composition.

[0147] Good evaluations were obtained in either Test Example 22, which used sodium polyacrylate with a different molecular weight than the test examples described above, or Test Example 23, which used poly(2-acrylamide-2-methylpropanesulfonic acid).

[0148] [Table 6]

[0149]

[0150] The water-in-oil composition of the present invention has been described based on the above embodiments and examples, but is not limited to them. Within the scope of the present invention and based on the basic technical concept of the present invention, various modifications, alterations, and improvements can be made to each disclosed element (including the elements described in the claims, specification, and drawings). Furthermore, within the scope of the claims of the present invention, various combinations / substitutions or selections of each disclosed element are possible.

[0151] Further issues, objects, and methods (including modifications) of the present invention are also made clear by all the disclosures of the present invention, including the claims.

[0152] The numerical ranges described in this book should be interpreted, even if not specifically stated otherwise, as any numerical value or range contained within that range is specifically described in this book.

[0153] Some or all of the above embodiments may also be described as follows, but are not limited to the following description. The appendices may also be combined with the claims described in the patent claims.

[0154] [Postscript 1]

[0155] A method of using a water-in-oil composition, wherein the water-in-oil composition of this disclosure is used as a topical skin agent.

[0156] [Postscript 2]

[0157] A method of using an oil-in-water composition, wherein the oil-in-water composition of this disclosure is used as a sunscreen cosmetic.

[0158] Industry availability

[0159] The oil-in-water emulsion compositions disclosed herein can be applied, for example, to cosmetics and cleansing agents applied to the skin. For instance, the oil-in-water emulsion compositions disclosed herein can be applied to base makeup, top makeup, color cosmetics, antiperspirants, deodorants, sunscreens, skin care products, and cleansing agents.

Claims

1. A water-in-oil composition comprising: (A) 0.02 to 0.25 mass% of a water-soluble polymer; (B) at least one selected from the group consisting of trehalose, xylitol, and erythritol; (C) water; (D) a first powder whose particle surface is hydrophobic; (E) a second powder whose particle surface is hydrophilic; and (F) an oily ingredient, the component (A) is at least one selected from the group consisting of polyacrylic acid, poly(2-acrylamido-2-methylpropane sulfonic acid), and salts thereof, and the weight average molecular weight of the component (A) is 500,000 to 8,000,000, the component (B) is 0.5 to 2.5 mass% relative to the mass of the composition, the component (E) has an oil absorption amount of linseed oil at 25°C of 170 ml or less per 100 g, and the component (E) is 1 to 5 mass% relative to the mass of the composition.

2. The water-in-oil composition according to claim 1, wherein the component (D) is 2 to 20 mass% relative to the mass of the composition.

3. The water-in-oil composition according to claim 1 or 2, wherein the component (D) is at least one selected from the group consisting of hydrophobized titanium oxide and hydrophobized zinc oxide.

4. The water-in-oil composition according to claim 1 or 2, wherein the component (E) is at least one selected from the group consisting of silica, corn starch, and cellulose.

5. The water-in-oil composition according to claim 1 or 2, wherein the component (F) comprises a liquid oily ingredient and an ultraviolet absorber.

6. The water-in-oil composition according to claim 1 or 2, which comprises or does not comprise a resinous powder having an average particle diameter of 1 to 20 μm, and in the case of comprising the resinous powder, the content of the resinous powder is 0.1 mass% or less relative to the mass of the composition.

7. The water-in-oil composition according to claim 1 or 2, which is applied to a skin external agent.

Images