Oil-in-water emulsion cosmetic and method for producing the same

Abstract

To provide an oil-in-water emulsion cosmetic that blends easily into the skin during application, provides excellent moisturizing properties after application, and is less sticky. [Solution] (A) Glycine derivative or a salt thereof, (B) Hydrophilic nonionic surfactant selected from the group consisting of POE castor oil derivatives and hydrogenated castor oil derivatives, (C) Water-soluble solvent, (D) an oil-in-water emulsion cosmetic comprising oil and (E) water. The content of component (A) is 0.3 to 5% by mass based on the total mass of the cosmetic. This cosmetic comprises emulsion particles containing component (B) dispersed in the aqueous phase.

Description

[Technical Field]

[0001] This invention relates to an oil-in-water emulsion cosmetic and a method for producing the same. [Background technology]

[0002] Oil-in-water emulsion cosmetics are cosmetics in which emulsion particles containing oily components are dispersed in an aqueous phase. When applied to the skin, they provide a refreshing feel similar to aqueous cosmetics, while also achieving various effects from the oily components, and are therefore used in a variety of cosmetics. Furthermore, the application of such cosmetics by impregnating them into sheet-like substrates is being considered, and cosmetics with a small average particle size of emulsion particles suitable for this purpose are being investigated (for example, Patent Document 1).

[0003] On the other hand, it is known that by incorporating compounds selected from the group consisting of glycine derivatives, aminodicarboxylic acid derivatives, acylaminodicarboxylic acid derivatives, pyrrolidinecarboxylic acid derivatives, piperidinecarboxylic acid derivatives, hexamethyleneiminecarboxylic acid derivatives, and β-alanine derivatives, as well as salts of the above derivatives, into cosmetics, effects such as inhibiting incomplete keratinization and reducing pore size can be obtained (for example, Patent Document 2). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2004-284960 [Patent Document 2] Japanese Patent Publication No. 2005-179342 [Overview of the project]

[0005] Our investigations revealed that when attempting to achieve effects such as inhibiting incomplete keratinization and reducing pore size by incorporating glycine derivatives into oil-in-water cosmetics, the user experience may be unsatisfactory. However, we unexpectedly discovered that by selecting a specific surfactant for the cosmetic and incorporating a higher concentration of glycine derivatives than commonly used, the usability could be improved.

[0006] The present invention provides the following: [1] (A) Equation (a): [ka] (In the formula, R 1 and R 2 Each of these is independently a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an aminomethylcarbonyl group, an amidino group, an alkylcarbonyl group, an alkenylcarbonyl group, an arylcarbonyl group, or an aralkylcarbonyl group, R 3 These are a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, or an aralkyl group. However, R 1 , R 2 , and R 3 (They cannot simultaneously become hydrogen atoms.) A glycine derivative or salt thereof represented by (B) Hydrophilic nonionic surfactant selected from the group consisting of POE castor oil derivatives and hydrogenated castor oil derivatives, (C) Water-soluble solvent, (D) Oils and (E)Water An oil-in-water emulsion cosmetic comprising, The content of component (A), based on the total mass of the aforementioned cosmetic, is 0.3 to 5% by mass. (B) An oil-in-water emulsion cosmetic in which emulsion particles containing component (B) are dispersed in the aqueous phase. [2] (B) The oil-in-water emulsion cosmetic according to [1], comprising polyethylene glycol ether of hydrogenated castor oil. [3] (B) The cosmetic composition according to [1] or [2], wherein the content of component (B) is 0.01 to 3% by mass, based on the total mass of the cosmetic composition. [4] (D) A cosmetic composition according to any one of [1] to [3], wherein the content of component is 3 to 30% by mass, based on the total mass of the cosmetic composition. [5] (A) A cosmetic composition according to any one of [1] to [4], wherein the component is glycylglycine. [6] An oil-in-water emulsion cosmetic according to any one of [1] to [5], wherein the average particle size of the emulsion particles is less than 1 μm. [7] The following steps: (I) A step of adding a hydrophilic nonionic surfactant to a water-soluble solvent and then adding an oil to form an emulsified composition. (II) A step of adding water to the emulsion composition to form an oil-in-water emulsion composition, and (III) A step of adding an aqueous solution containing the glycine derivative or a salt thereof to the oil-in-water emulsion composition to form an oil-in-water emulsion cosmetic. A method for producing a cosmetic composition according to any one of [1] to [6], comprising the above.

[0007] According to the present invention, an oil-in-water emulsion cosmetic is provided that is easily absorbed into the skin during application, provides excellent moisturizing properties after application, and is less sticky. Specific description of the invention

[0008] The oil-in-water emulsion cosmetic composition according to the present invention (hereinafter sometimes simply referred to as "cosmetic composition") is (A) Glycine derivative or salt thereof (B) Hydrophilic nonionic surfactant, (C) Water-soluble solvent, (D) Oils and (E)Water It consists of the following. Each of these components, as well as any additional components that may be added, are described below.

[0009] (A) A glycine derivative or a salt thereof The cosmetic according to the present invention contains a glycine derivative or a salt thereof (hereinafter sometimes referred to as component (A)). The glycine derivative is represented by formula (1). [Chemical formula] In the formula, R 1 and R 2 are each independently a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an aminomethylcarbonyl group, an amidino group, an alkylcarbonyl group, an alkenylcarbonyl group, an arylcarbonyl group, or an aralkylcarbonyl group, R 3 is a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, or an aralkyl group. However, R 1 , R 2 , and R 3 will not simultaneously be hydrogen atoms.

[0010] Component (A) may be a salt of the glycine derivative represented by formula (1). The type of salt is not particularly limited as long as it is a pharmacologically acceptable salt, and examples include hydrochloride, sulfate, phosphate, hydrobromide, sodium salt, potassium salt, magnesium salt, calcium salt, magnesium salt, ammonium salt, etc. Examples of organic salts include acetate, lactate, maleate, fumarate, tartrate, methanesulfonate, p-toluenesulfonate, triethanolamine salt, amino acid salt, etc. Component (A) is preferably glycylglycine.

[0011] Component (A) can be blended in one kind or two or more kinds. The content rate of component (A) is 0.3 to 5% by mass, preferably 0.5 to 3% by mass, and more preferably 1 to 2% by mass based on the total mass of the cosmetic.

[0012] (B) Hydrophilic nonionic surfactant The cosmetic composition according to the present invention comprises a specific hydrophilic nonionic surfactant (hereinafter sometimes referred to as component (B)). Component (B) used in the present invention is a hydrophilic nonionic surfactant selected from the group consisting of POE castor oil derivatives and hydrogenated castor oil derivatives, and examples include POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyloglutamic acid monoisostearate diester, and POE hydrogenated castor oil maleic acid. As such component (B), polyethylene glycol ether of hydrogenated castor oil is preferred, and specifically, examples include PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, and PEG-100 hydrogenated castor oil. In the present invention, component (B) may be solely polyethylene glycol ether of hydrogenated castor oil.

[0013] In the cosmetic composition of the present invention, the content of component (B) is preferably 0.01 to 3% by mass, and more preferably 0.1 to 2% by mass, based on the total mass of the cosmetic composition. In the cosmetic composition of the present invention, component (B) may consist of one or more types, but the above range represents the content of the total amount of hydrophilic nonionic surfactants.

[0014] (C) Water-soluble solvent The cosmetic composition according to the present invention comprises a water-soluble solvent (hereinafter sometimes referred to as component (C)). Component (C) has the effect of dissolving component (B) and efficiently orienting it at the interface with the oil phase that is subsequently added.

[0015] (C) Components include, for example, lower monohydric alcohols such as ethanol, propanol, and benzyl alcohol; polyhydric alcohols such as glycerin, ethylene glycol, diethylene glycol, triethylene glycol, 2,5-hexanediol, 2,3-butylene glycol, 2,4-heptanediol, hexylene glycol, 1,5-pentanediol, propylene glycol, 1,3-butylene glycol, and dipropylene glycol; ethylene oxide, dioxane, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, ethylene glycol Examples of ethers include ethyl acetate monobutyl ether, diethylene glycol monomethyl ether, dimethyl glycol monoethyl ether, dimethyl glycol monomethyl ether, dimethyl glycol monobutyl ether, dimethyl glycol diethyl ether, ethoxytriglycol, monopropylene glycol methyl ether, dipropylene glycol methyl ether, tripropylene glycol monomethyl ether, ethylene glycol acetate monomethyl ether, diethylene glycol acetate monomethyl ether, diethylene glycol acetate monoethyl ether, and polyoxyethylene / polyoxypropylene random polymer methyl ether. Preferably, it is a polyhydric alcohol.

[0016] (C) One or more components may be included. The content of component (C) is preferably 5 to 25% by mass, and more preferably 10 to 20% by mass, based on the total mass of the cosmetic.

[0017] (D) Oil The cosmetic composition according to the present invention comprises an oil component (hereinafter sometimes referred to as component (D)). Examples of component (D) include ester oils, hydrocarbon oils, silicone oils, higher fatty acids, higher alcohols, alkyl glyceryl ethers, liquid oils, solid oils, semi-solid oils, etc., and preferably contains ester oils.

[0018] Examples of ester oils include octyl octanoate, nonyl nonanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, and cholesteryl 12-hydroxystearate. Ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, tripropylene glycol pivalate, diisostearyl malate, glyceryl di-2-heptylundecanoate, glyceryl diisostearate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythrityl tetraethylhexanoate, tri- Glyceryl 2-ethylhexanoate (triethylhexanoin), glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate-2-ethylhexyl palmitate, glyceryl trimiristate, glyceride tri-2-heptylundecanoate, methyl castor oil fatty acid ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl Examples include 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 sebacate, 2-ethylhexyl succinate, triethyl citrate, cetyl ethylhexanoate, macadamia nut fatty acid phytosteryl, and the like, with pentaerythrityl tetraethylhexanoate being preferred.

[0019] Examples of hydrocarbon oils include isododecane, isohexadecane, isoparaffin, mineral oil (liquid paraffin), ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, and hydrogenated polydecene.

[0020] Examples of silicone oils include linear polysiloxanes (e.g., dimethicone, diphenylsiloxyphenyl trimethicone, diphenylpolysiloxane, etc.), cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins forming a three-dimensional network structure, silicone rubber, various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), acrylic silicones, etc., with linear polysiloxane being preferred.

[0021] Examples of high-grade fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tallic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0022] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.) and branched-chain alcohols (e.g., lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.).

[0023] Examples of alkylglyceryl ethers include batyl alcohol and chymyl alcohol.

[0024] Examples of liquid oils include avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, sesame oil, peach kernel oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, elm oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnamon oil, Japanese tuni oil, jojoba oil, germ oil, and triglycerin. Examples of solid oils include cocoa butter, coconut oil, hydrogenated coconut oil, palm oil, palm kernel oil, hydrogenated palm oil, Japanese wax kernel oil, hydrogenated oil, and Japanese wax. Examples of semi-solid oils include shea butter, partially hydrogenated coconut oil, and partially hydrogenated jojoba oil.

[0025] In the present invention, component (D) may be one or more types. The content of component (D) is preferably 3 to 30% by mass, and more preferably 4 to 20% by mass, based on the total mass of the cosmetic composition.

[0026] (E)Water The cosmetic composition according to the present invention comprises water (hereinafter sometimes referred to as component (E)). As the water, water used for cosmetics, quasi-drugs, etc., can be used, for example, purified water, ion-exchanged water, tap water, etc. In the cosmetic composition according to the present invention, the water content is preferably 50 to 90% by mass, and more preferably 55 to 85% by mass, based on the total mass of the cosmetic composition according to the present invention.

[0027] In addition to the above-mentioned components, the cosmetic composition according to the present invention may contain any other components commonly used in cosmetics and pharmaceuticals. Examples of optional components include powder components, humectants, water-soluble polymers, UV absorbers, metal ion chelating agents, amino acids (excluding component (A)), organic amines, pH adjusters, antioxidants, and other components commonly used in cosmetics. One or more of these components may be included, as long as they achieve the effects of the present invention.

[0028] Examples of powder components include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, rose mica, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, tungstate metal salts, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate, calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, and metal soaps (e.g., zinc myristate, calcium palmitate) (e.g., aluminum stearate, boron nitride, etc.); organic powders (e.g., 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, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, yellow ochre, etc.); inorganic black pigments (e.g., For example, black iron oxide, lower titanium oxide, etc.); inorganic purple pigments (for example, mango violet, cobalt violet, etc.); inorganic green pigments (for example, chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (for example, ultramarine, Prussian blue, etc.); pearl pigments (for example, titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (for example, aluminum powder, copper powder, etc.); zirconium, barium or Examples include organic pigments such as aluminum lake (e.g., organic pigments such as Red 201, Red 202, Red 204, Red 205, Red 220, Red 226, Red 228, Red 405, Orange 203, Orange 204, Yellow 205, Yellow 401, and Blue 404, as well as Red 3, Red 104, Red 106, Red 227, Red 230, Red 401, Red 505, Orange 205, Yellow 4, Yellow 5, Yellow 202, Yellow 203, Green 3, and Blue 1); and natural pigments (e.g., chlorophyll, β-carotene, etc.).

[0029] Examples of moisturizing agents include xylitol, sorbitol, maltitol, trehalose, erythritol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, carotenoid acid, fish collagen, phytosteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, diglycerin (EO)PO adduct, Rosa rugosa extract, Achillea millefolium extract, and Melilotus extract.

[0030] Examples of naturally occurring water-soluble polymers include plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed, algae colloids (cassia extract), starch (rice, corn, potato, wheat); and microbial polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.).

[0031] Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methylcellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, hydroxypropylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, crystalline cellulose, cellulose powder, etc.); and alginate-based polymers (e.g., sodium alginate, propylene glycol alginate ester, etc.).

[0032] Examples of synthetic water-soluble polymers include vinyl polymers (e.g., polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyethylene glycol 20,000, 40,000, 60,000, 1,000,000 polyoxyethylene polyoxypropylene copolymers, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); and cationic polymers.

[0033] Examples of UV absorbers include benzoic acid-based UV absorbers (e.g., para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerol ester, 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, etc.); anthranilic acid-based UV absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based UV absorbers (e.g., Amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanolphenyl salicylate, etc.); cinnamic acid-based UV absorbers (e.g., octyl cinnamate, ethyl-4-isopropyl cinnamate, methyl-2,5-diisopropyl cinnamate, ethyl-2,4-diisopropyl cinnamate, methyl-2,4-diisopropyl cinnamate, propyl-p-methoxy cinnamate, isopropyl-p-methoxy cinnamate) Mate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-diparamethoxycinnamate, etc.); pyridazine derivatives (dimorpholinopyridazine); 3-(4'-methylbenzylidene) Examples include -d,l-camphor, 3-benzylidene-d,l-camphor; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole; 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenylbenzotriazole); dibenzarazine; dianisioylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, etc.

[0034] Examples of metal ion chelating agents include 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonic acid, disodium edetate, trisodium edetate, tetrasodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetate, and trisodium ethylenediaminehydroxyethyl triacetate.

[0035] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.) and basic amino acids (e.g., hydroxylysine, arginine, etc.). Examples of amino acid derivatives include sodium acyl sarcosinate (sodium lauroyl sarcosinate), acyl glutamate, acyl taurine salt, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, and trimethylglycine.

[0036] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0037] Examples of pH adjusting agents include buffering agents such as lactate-sodium lactate, citrate-sodium citrate, and succinate-sodium succinate. Examples of antioxidants include δ-tocopherol, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0038] Other possible ingredients include, for example, preservatives (ethylparaben, butylparaben, phenoxyethanol, etc.); water-soluble whitening agents (for example, arbutin, tranexamic acid, potassium 4-methoxysalicylate, ellagic acid, ascorbic acid, ascorbic acid glucoside, magnesium ascorbic acid phosphate, and other ascorbic acid derivatives); activators (for example, royal jelly, photosensitizer, cholesterol derivatives, etc.); blood circulation promoters (for example, nonylic acid vanenylamide, benzyl nicotinate, β-butoxyethyl nicotinate, capsaicin, ginger). Examples include: cinnamon, cantharis tincture, ichthamol, tannic acid, inositol hexanicotinate, cyclandelate, cinnarizine, trazoline, acetylcholine, verapamil, cepharanthine, etc.); anti-seborrheic agents (e.g., sulfur, thianthol, etc.); anti-inflammatory agents (e.g., glycyrrhizinate, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, thiotaurine, hypotaurine, etc.); vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2, vitamin B2 derivatives, vitamin B12, vitamin B15, vitamin B15 derivatives, etc.

[0039] The cosmetic composition according to the present invention contains each of the above components and is an oil-in-water emulsion cosmetic composition in which emulsion particles containing component (B) are dispersed in the aqueous phase. In general oil-in-water cosmetics, the particle size of the emulsion particles is 2 to 10 μm, but in the cosmetic composition according to the present invention, the average particle size of the emulsion particles can be less than 1 μm. In the present invention, the average particle size of the emulsion particles is more preferably 0.1 μm or more and less than 1 μm, and particularly preferably 0.5 μm or more and less than 1 μm. The particle size of the emulsion particles can be measured using a microscope. Cosmetics containing emulsion particles with such small average particle size can be manufactured using each of the above components, for example, by the method described later.

[0040] Examples of cosmetics according to the present invention include skincare cosmetics (e.g., lotions, emulsions, creams, serums, packs, masks, etc.), makeup cosmetics (e.g., foundations, makeup bases, etc.), skin cleansing products (e.g., facial cleansers, makeup removers, etc.), sunscreen cosmetics, ointments, etc. Cosmetics according to the present invention tend to provide excellent usability, especially when they are low-viscosity liquid cosmetics. Therefore, the viscosity measured at 30°C using a B-type rotational viscometer is preferably 1 to 3,000 mPa·s, but is not limited to this. Viscosity can be appropriately adjusted depending on the application. Furthermore, in one preferred embodiment, cosmetics according to the present invention are used by impregnating a sheet-like substrate. These embodiments are merely examples, and cosmetics according to the present invention are not limited to these forms.

[0041] The emulsification method for the cosmetic composition of the present invention is not particularly limited, but the cosmetic composition according to the present invention can be manufactured by a method comprising the following steps (I) to (III). (I) A step of adding a hydrophilic nonionic surfactant to a water-soluble solvent and then adding an oil to form an emulsified composition. (II) A step of adding water to the emulsion composition to form an oil-in-water emulsion composition, and (III) A step of adding an aqueous solution containing the glycine derivative or a salt thereof to the oil-in-water emulsion composition to form an oil-in-water emulsion cosmetic.

[0042] The method according to the present invention replaces the conventional oil-water system by first emulsifying with an oil-water-soluble solvent system, secondly stabilizing it by adding water, and thirdly adding an aqueous solution containing other components. The surface tension of the water-soluble solvent is far lower than that of water. Therefore, there is no strong hydrogen bond between the water-soluble solvent and the hydrophilic nonionic surfactant, unlike the bond between water and the hydrophilic nonionic surfactant.

[0043] Therefore, in the method according to the present invention, a hydrophilic nonionic surfactant is dissolved in a water-soluble solvent, and then oil is added to emulsify it. As a result, the interfacial tension between the oil and water-soluble solvent is low, and even hydrophilic nonionic surfactants with low surface activity can be easily adsorbed to the interface with very little stirring force. Furthermore, since there is no need to add heat, the manufacturing process is simplified. For this reason, even if the active ingredient is sensitive to heat, it can be stably incorporated. In the method according to the present invention, it is preferable that the entire process be carried out at room temperature between 5 and 40°C. In addition, by adding water thereafter, an extremely stable oil-in-water emulsion cosmetic can be obtained that has low viscosity, is non-sticky, has a good feel, has a small particle size, and has good uniformity. According to the method of the present invention, it is possible to control the average emulsion particle size of the emulsion particles contained in the oil-in-water cosmetic to be smaller than that of general emulsion particles. [Examples]

[0044] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is expressed as mass % based on the total mass.

[0045] [Examples 1-3, Comparative Examples 1-4] Cosmetics for each example and comparative example were prepared using the formulations shown in Table 1. Furthermore, the performance of these cosmetics was evaluated as follows. The particle size of the emulsified particles was measured using a microscope, and the average value is recorded.

[0046] [evaluation] Ten expert panelists applied the cosmetics prepared above to their skin and evaluated their usability based on the following criteria: speed of absorption into the skin upon application, moisturizing effect after application, and lack of stickiness after application. The results are shown in Table 1. [How quickly it absorbs into the skin] A (Very Good): More than 8 out of 10 people reported that they adapted quickly. B (Good): 5 to 7 out of 10 people reported that they adapted quickly. C (Fairly Good): 3 to 4 out of 10 people reported that they adapted quickly. D (Poor): Two or fewer out of ten people answered that they adapted quickly.

[0047] [Moisture level after application] A (Very Good): More than 8 out of 10 people reported that it was moist. B (Good): Between 5 and 7 out of 10 people reported that it felt moist. C (Fair): 3 to 4 out of 10 people reported that it felt moist. D (Poor): Two or fewer out of ten people reported that it was moist.

[0048] [No stickiness after application] A (Excellent): 8 or more out of 10 people reported no stickiness. B (Good): 5 to 7 out of 10 people reported no stickiness. C (Fairly Good): 3 to 4 out of 10 people reported no stickiness. D (Poor): Two or fewer out of ten people reported that it was not sticky.

[0049] [Table 1]

Claims

1. (A) Equation (a): 【Chemistry 1】 (In the formula, R １ and R ２ Each of these is independently a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an aralkyl group, an aminomethylcarbonyl group, an amidino group, an alkylcarbonyl group, an alkenylcarbonyl group, an arylcarbonyl group, or an aralkylcarbonyl group, and R ３ These are a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, or an aralkyl group. However, R １ , R ２ , and R ３ (They cannot simultaneously become hydrogen atoms.) A glycine derivative or salt thereof represented by (B) A hydrophilic nonionic surfactant selected from the group consisting of POE castor oil derivatives and hydrogenated castor oil derivatives, (C) Water-soluble solvent, (D) Oils, and (E) Water An oil-in-water emulsion cosmetic comprising, An oil-in-water emulsion cosmetic in which the content of component (A) is 0.3 to 5% by mass based on the total mass of the cosmetic, and emulsion particles containing component (B) are dispersed in the aqueous phase.

2. The oil-in-water emulsion cosmetic composition according to claim 1, wherein component (B) contains polyethylene glycol ether of hydrogenated castor oil.

3. The cosmetic composition according to claim 1 or 2, wherein the content of component (B) is 0.01 to 3% by mass, based on the total mass of the cosmetic composition.

4. The cosmetic composition according to claim 1 or 2, wherein the content of component (D) is 3 to 30% by mass, based on the total mass of the cosmetic composition.

5. (A) The cosmetic composition according to claim 1 or 2, wherein the component is glycylglycine.

6. The oil-in-water emulsion cosmetic composition according to claim 1 or 2, wherein the average particle size of the emulsion particles is less than 1 μm.

7. The following steps: (I) A step of adding a hydrophilic nonionic surfactant to a water-soluble solvent and then adding an oil to form an emulsified composition. (II) A step of adding water to the emulsion composition to form an oil-in-water emulsion composition, and (III) A step of adding an aqueous solution containing the glycine derivative or a salt thereof to the oil-in-water emulsion composition to form an oil-in-water emulsion cosmetic. A method for producing a cosmetic composition according to claim 1 or 2, comprising:

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