Sunscreen cosmetics and methods for manufacturing sunscreen cosmetics

Abstract

The objective is to obtain a sunscreen cosmetic that has a refreshing feel, water resistance, does not exhibit powder aggregation or sedimentation, has excellent storage stability over time, and provides high UV protection, by using a combination of surface-hydrophobized fine-particle metal oxide, dialkyl sulfosuccinate, and a film-forming polymer emulsion. [Solution] By dispersing surface-hydrophobized fine particle metal oxide in water or an aqueous medium containing a water-soluble component using a dialkyl sulfosuccinate, and further using a film-forming polymer emulsion in combination, a sunscreen cosmetic is provided that has a fresh feel and water resistance, does not exhibit powder aggregation or sedimentation, has excellent storage stability over time, and has a high UV shielding effect.

Description

TECHNICAL FIELD

[0001] The present invention relates to an oil-in-water emulsified sunscreen cosmetic or water-based cosmetic with high ultraviolet shielding effect, which contains surface-hydrophobized fine particulate metal oxide, dialkyl sulfosuccinate and film-forming polymer emulsion, and a method for producing the same. BACKGROUND ART

[0002] Conventionally, when stably dispersing an inorganic powder in water or an aqueous medium, a hydrophilic powder or a hydrophilized powder has been used. On the other hand, when blending a hydrophobized powder into water or an aqueous medium, a large amount of an ionic surfactant such as alkyl phosphate, polyoxyethylene adduct alkyl ether phosphate, lecithin or the like is used as a dispersant, or a natural product-derived surfactant (see Patent Document 1) is used for dispersion in water. Further, as a method for improving the dispersibility of powder in water, a method of subjecting the powder to hydrophilic treatment, for example, the techniques disclosed in Patent Documents 2 to 4 can be mentioned. Patent Documents 2 and 3 disclose techniques relating to coating treatment of a water-soluble cationic polymer and a low-molecular organosilicon derivative, and Patent Document 4 discloses a technique of surface-treating a polyether-modified silane, respectively. When such a hydrophilic powder is used, it can be easily added to an aqueous composition, and the blending amount can be increased, so that there is an advantage that the characteristics of the powder are easily exhibited.

[0003] However, since the powder itself is hydrophilic, there is a problem that it is difficult to obtain a coating film having sufficient water resistance as an aqueous inorganic powder dispersion. In addition, when a large amount of the above-described dispersant is blended as a method of blending the hydrophobized powder into water or an aqueous medium, it is similarly difficult to obtain a coating film having sufficient water resistance.

[0004] On the other hand, oil-in-water (O / W) emulsion formulations and water-based formulations, because their main component is water-based, provide a light feel, but it is difficult to obtain a coating with sufficient water resistance, and they have the problem of easily breaking down with sweat and water. In response to this, a method has been proposed to use film-forming polymer emulsions to improve the water resistance of makeup cosmetics made with oil-in-water (O / W) emulsion formulations and water-based formulations and to improve the durability of the makeup (Patent Documents 5-7). However, when a film-forming polymer emulsion is incorporated to impart water resistance to oil-in-water or water-based sunscreen cosmetics whose main component is a metal oxide UV scattering agent, there is a problem of poor compatibility with the metal oxide UV scattering agent, resulting in powder aggregation, sedimentation, etc. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2013-116864 [Patent Document 2] Patent No. 4250551 [Patent Document 3] Patent No. 4475970 [Patent Document 4] Japanese Patent Publication No. 2003-26958 [Patent Document 5] Japanese Patent Publication No. 2005-314372 [Patent Document 6] Japanese Patent Publication No. 2017-114803 [Patent Document 7] Japanese Patent Publication No. 2020-70259 [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention has been made in view of the above circumstances, and aims to provide a sunscreen cosmetic and a method for producing the same, which have high water resistance, a refreshing feel, excellent storage stability over time without powder aggregation or sedimentation, and high ultraviolet shielding effect, by using a combination of surface hydrophobized fine particle metal oxide, dialkyl sulfosuccinate, and film-forming polymer emulsion. [Means for solving the problem]

[0007] To achieve the aforementioned objectives, the inventors conducted diligent research and found that by adding a dialkyl sulfosuccinate to surface-hydrophobized fine-particle metal oxides, the mixture can be easily dispersed in water or an aqueous medium. Furthermore, by using a film-forming polymer emulsion in combination, a sunscreen cosmetic can be obtained that has high water resistance, a refreshing feel, no powder aggregation or sedimentation, excellent storage stability over time, and high UV protection effect. This led to the completion of the present invention.

[0008] In other words, the sunscreen cosmetic composition according to the present invention is characterized by containing the following components (A), (B), and (C). (A) Surface hydrophobized fine metal oxide particles (B) Dialkyl sulfosuccinate (C) Film-forming polymer emulsion

[0009] Furthermore, the present invention provides a method for producing a sunscreen cosmetic, characterized by using component (B) dialkyl sulfosuccinate as a dispersant, dispersing surface-hydrophobized fine-particle metal oxide of component (A) in water or an aqueous medium containing a water-soluble component, and mixing this dispersion with a film-forming polymer emulsion of component (C) and, if necessary, other cosmetic components to produce a sunscreen cosmetic. [Effects of the Invention]

[0010] The sunscreen cosmetic of the present invention has high water resistance, is non-sticky and non-greasy, has a fresh and refreshing feel, does not exhibit powder aggregation or sedimentation, has excellent storage stability over time, and provides high UV protection. [Brief explanation of the drawing]

[0011] [Figure 1] This graph compares the UV protection effect of Examples 1 and 2 with that of Comparative Example 3. [Modes for carrying out the invention]

[0012] Next, specific embodiments of the sunscreen cosmetic and its manufacturing method according to the present invention will be described.

[0013] The fine particle metal oxide in component (A) of the present invention is preferably one or more selected from the group consisting of fine particle zinc oxide, fine particle titanium oxide, fine particle cerium oxide, fine particle iron oxide, and fine particle chromium oxide, from the viewpoint of improving the ultraviolet protection effect, more preferably one or more selected from the group consisting of fine particle zinc oxide, fine particle titanium oxide, and fine particle cerium oxide, and even more preferably one or more selected from the group consisting of fine particle zinc oxide and fine particle titanium oxide. Two or more of these fine particle metal oxides may be used in combination.

[0014] The fine metal oxide in component (A) of the present invention may be a composite powder in which the surface is coated with another inorganic material. In this case, the surface treatment material may be a known inorganic surface treatment material, such as zinc oxide, titanium oxide, cerium oxide, iron oxide, barium sulfate, hydrated silica, silica, aluminum hydroxide, and alumina. The amount of coating is preferably 1% to 25% by mass relative to the fine metal oxide.

[0015] The fine particle metal oxide preferably has an average particle size (hereinafter, when simply referred to as "particle size" in the present specification, it means the average particle size) of 1 to 200 nm, more preferably 1 to 100 nm. The ultraviolet shielding particles having such a particle size are particularly preferable in that they have high visible light transparency and suitable ultraviolet shielding ability. The particle size of the inorganic powder is measured by a method of measuring the particle sizes of 200 randomly selected particles with an electron microscope and calculating the average of the primary particle sizes thereof.

[0016] The method for subjecting the fine particle metal oxide in component (A) of the present invention to surface hydrophobization treatment is not particularly limited, and a known method can be used. The surface hydrophobization treatment is a treatment that reduces the affinity of the surface of the fine particle metal oxide for water, and a surface treatment with a material that is easily soluble in water or a material that disperses in water after the treatment does not fall under the "surface hydrophobization treatment" of the present invention.

[0017] More specific examples of the above surface hydrophobization treatment include treatment with surface treatment agents such as silicone oils, fatty acids, and alkylsilanes. These surface treatments may be performed alone or in combination. Examples of the silicone oils include so-called straight silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, as well as so-called branched silicone oils such as triethoxysilylethyl polydimethylsiloxyethyl dimethicone. Examples of the fatty acids include stearic acid, isostearic acid, lauric acid, myristic acid, and palmitic acid. Examples of the alkylsilanes include alkoxysilanes such as methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, and decyltrimethoxysilane, as well as silazanes such as hexamethyldisilazane. Among these, it is preferable to use at least one selected from the group consisting of dimethylpolysiloxane, methylhydrogenpolysiloxane, stearic acid, isostearic acid, and octyltriethoxysilane as the surface treatment agent, from the viewpoint of enabling further improved dispersibility in water.

[0018] In the surface hydrophobization treatment of the fine particle metal oxide, it is preferable that the surface hydrophobization treatment is performed at a proportion of 1 to 15 mass%, or 2 to 12 mass%, relative to the total amount of the fine particle metal oxide after treatment. When the content is not less than the above lower limit, sufficient hydrophobicity is ensured, and when the content is not more than the above upper limit, cost benefits due to saturation of the hydrophobic effect can be obtained.

[0019] As a treatment method for obtaining the surface-hydrophobized fine particle metal oxide, the surface treatment agent is dissolved or dispersed in a suitable organic solvent, the resulting mixture is stirred and mixed with the target powder, and then the organic solvent is removed, whereby the surface-hydrophobized fine particle metal oxide can be obtained. Examples of the organic solvent used herein include alcohols such as ethanol, isopropyl alcohol and isobutanol, hydrocarbon-based organic solvents such as toluene, n-hexane and cyclohexane, and polar organic solvents such as acetone, ethyl acetate and butyl acetate.

[0020] The blending amount of Component (A) in the sunscreen cosmetic of the present invention is preferably 5 to 50 mass%.

[0021] The dialkyl sulfosuccinate, which is component (B) in the sunscreen cosmetic of the present invention, is an anionic surfactant obtained by reacting a linear or branched alcohol having 6 to 22 carbon atoms with maleic anhydride to form a diester, and then sulfating it. Examples of alcohols that can be used include hexanol, octanol, decanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, 2-ethylhexanol, and 2-methyldodecanol. Examples of salts of the dialkyl sulfosuccinate include alkali metals such as sodium and potassium; lower alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; and ammonia, among which sodium salts are preferred.

[0022] Specific examples of dialkyl sulfosuccinates include, for example, sodium dihexyl sulfosuccinate, sodium di-2-ethylhexyl sulfosuccinate, and sodium dilauryl sulfosuccinate.

[0023] The amount of component (B) in the sunscreen cosmetic of the present invention is appropriately set in order to disperse the surface-hydrophobized fine metal oxide particles, which are component (A), in the sunscreen cosmetic of the present invention. For example, it is 0.5% by mass or more and 10% by mass or less, and preferably 1.5% by mass or more and 5% by mass or less. If it is less than 0.5% by mass, the dispersibility of the surface-hydrophobized inorganic powder in water may be poor, and if it exceeds 10% by mass, when the aqueous dispersion is incorporated into the sunscreen cosmetic, the feel of the sunscreen cosmetic may become heavy.

[0024] The sunscreen cosmetic of the present invention may be prepared by first dispersing a dispersion of surface-hydrophobized fine-particle metal oxide of component (A) in water or an aqueous medium containing a water-soluble component, using component (B) dialkyl sulfosuccinate as a dispersant, and mixing this dispersion with a film-forming polymer emulsion of component (C) and, if necessary, other cosmetic components.

[0025] Any known method capable of uniform dispersion is acceptable for obtaining the above-mentioned dispersion. Various dispersers such as wet bead mills, homomixers, dispersers, kneaders, kneading extruders, and roll mills can be used, but wet bead mills are more preferred.

[0026] The film-forming polymer emulsion, which is component (C) in the sunscreen cosmetic of the present invention, includes alkyl acrylate copolymer emulsions, alkyl acrylate-styrene copolymer emulsions, alkyl acrylate-vinyl acetate copolymer emulsions, urethane resin emulsions, and the like. Alkyl acrylate as used herein also includes alkyl methacrylate. The film-forming polymer emulsion can be used with water as the medium and with a solid content concentration of 30-60% by mass, thereby enhancing the sunscreen effect.

[0027] Component (C) can be a commercially available product. Examples of alkyl acrylate copolymer emulsions include Yodozol GH800F (manufactured by AkzoNobel, solid content concentration 45% by mass), Yodozol GH810F (manufactured by AkzoNobel, solid content concentration 46% by mass), Yodozol GH34F (manufactured by AkzoNobel, solid content concentration 42% by mass), Daitozol 5000SJ (manufactured by Daito Chemical Industries, solid content concentration 50% by mass), and ARON AC-1000 (manufactured by Nikko Chemicals, solid content concentration 40% by mass). Examples of alkyl acrylate / styrene copolymer emulsions include Yodozol GH41F (manufactured by AkzoNobel, solid content concentration 45% by mass), Daitozol 5000STY (manufactured by Daito Chemical Industries, solid content concentration 50% by mass), and Emapoly CE-119N (distributed by Nikko Chemicals). Examples of alkyl acrylate / vinyl acetate copolymer emulsions include Vinizol 2140L (manufactured by Daido Chemical Industries, Ltd., solids content 45% by mass). Examples of urethane resin emulsions include BAYCUSAN C1000 (manufactured by Bayer MaterialScience AG, solids content 40% by mass) and BAYCUSAN C1004 (manufactured by Bayer MaterialScience AG, solids content 40% by mass).

[0028] The amount of component (C) in the sunscreen cosmetic of the present invention is preferably 0.5% to 10% by mass. Below 0.5% by mass, sufficient water resistance cannot be obtained, and above 10% by mass, the sunscreen cosmetic may become too thick, which is undesirable.

[0029] The sunscreen cosmetic obtained in this manner can stably disperse surface-hydrophobically treated fine metal oxide particles in an aqueous composition. This makes it possible to obtain an aqueous composition with stable UV protection performance. Furthermore, surface-hydrophobically treated fine metal oxide particles can also be dispersed in the aqueous phase in an oil-in-water emulsion cosmetic. Such a special form of cosmetic is preferable because it can provide a different feel from conventional cosmetics in which powder is dispersed in an oil phase.

[0030] The sunscreen cosmetic of the present invention can be provided not only as a sunscreen cream, sunscreen lotion, or sunscreen emulsion, but also as a foundation, makeup base, makeup cosmetic, hair cosmetic, etc., that provides sunscreen effects.

[0031] The sunscreen cosmetic composition of the present invention can be in any form, such as an aqueous cosmetic composition or an oil-in-water cosmetic composition.

[0032] The sunscreen cosmetic composition of the present invention may contain any aqueous and oily components that can be used in the field of cosmetics. The aqueous and oily components are not particularly limited and may contain, for example, water-soluble polymers, oils, surfactants, humectants, higher alcohols, polyhydric alcohols, metal ion chelating agents, oil-soluble polymers, UV shielding agents, various extracts, colorants such as organic dyes, preservatives, antioxidants, pigments, thickeners, pH adjusters, fragrances, cooling agents, antiperspirants, bactericides, skin activators, and various powders.

[0033] The above water-soluble polymers are not particularly limited, but include natural polymers such as gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), algae colloid (quince extract), starch (rice, corn, potato, wheat), glycyrrhizin, xanthan gum, dextran, succinoglucan, pullulan, gellan gum, kercogel, mannan, curdlan, locust bean gum, sclerotium gum, etc.; animal-derived polymers such as collagen, casein, albumin, gelatin, etc.; starch-based polymers such as carboxymethyl starch, methylhydroxypropyl starch, etc.; methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxycellulose, hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydrophobized hydroxypropylmethylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, sodium cellulose sulfate, crystalline cellulose Cellulose-based polymers such as cellulose gum, cationized cellulose, and cellulose powder; alginic acid-based polymers such as alginic acid, sodium alginate, and propylene glycol alginate; vinyl-based polymers such as polyvinyl alcohol, polyvinyl acetate, vinylpyrrolidone and vinyl acetate copolymer, polyvinyl methyl ether, polyvinylpyrrolidone, alkyl-modified carboxyvinyl polymer, and carboxyvinyl polymer (carbomer); polyoxyethylene or polyoxypropylene copolymer polymers such as polyethylene glycol, polyethyleneimine, and (PEG-240 / decyltetradeceth-20 / HDI) copolymer; sodium polyacrylate, polyacrylamide, polyacrylate alkanolamine, alkyl methacrylate and dimethylaminoethyl methacrylate copolymer; poly-2-acrylamide-2-methylpropanesulfonic acid, polymethacryloyloxytrimethylammonium, (acryloyldimethyltaurate ammonium / VP) copolymer, and dimethylacrylamide / acryloyldimethyltaurate sodium crosspolymer.Examples of acrylic polymers include (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, (sodium acrylate / acryloyldimethyltaurate) copolymer, (alkyl acrylate / steareth-20 methacrylate) copolymer, acrylates / alkyl (C10-30) acrylate crosspolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, polyethyl acrylate, polyalkylacrylamide / polyacrylamide copolymer, (ammonium acryloyldimethyltaurate / carboxyethyl acrylate) crosspolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, and polyacrylate crosspolymer-6.

[0034] The above oils are not particularly limited, but for example, natural animal and vegetable oils and fats (e.g., olive oil, mink oil, castor oil, palm oil, beef tallow, evening primrose oil, coconut oil, castor oil, cocoa oil, macadamia nut oil, etc.); waxes (e.g., jojoba oil, beeswax, lanolin, carnauba wax, candelilla wax, etc.); higher alcohols (e.g., lauryl alcohol, stearyl alcohol, cetyl alcohol, oleyl alcohol, etc.); higher fatty acids (e.g., lauric acid, palmitic acid, stearic acid, oleic acid, behenic acid, lanolin fatty acid, etc.); higher aliphatic hydrocarbons (e.g., Examples of synthetic ester oils include liquid paraffin, solid paraffin, squalane, petrolatum, ceresin, microcrystalline wax, etc.; synthetic ester oils (e.g., butyl stearate, hexyl laurate, diisopropyl adipate, diisopropyl sebacate, octyldodecyl myristate, isopropyl myristate, isopropyl palmitate, isopropyl myristate, cetyl isooctanoate, neopentyl glycol dicaprate); and silicone derivatives (e.g., silicone oils such as methyl silicone and methylphenyl silicone). Furthermore, oil-soluble vitamins, preservatives, and whitening agents can also be incorporated.

[0035] Examples of the above-mentioned surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants. The above-mentioned nonionic surfactants are not particularly limited and include, for example, sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, propylene glycol fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene propylene glycol fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene phytostanol ethers, polyoxyethylene phytosterose ethers, polyoxyethylene cholestanol ethers, polyoxyethylene cholesteryl ethers, alkyl glyceryl ether-modified silicones, polyether-modified silicones, polyoxyalkylene-alkyl copolymerized silicones, and polyoxyalkylene-fluoroalkyl copolymerized silicones.

[0036] Other surfactants may be included, for example, anionic surfactants such as fatty acid soaps, higher alkyl sulfate esters, POE lauryl sulfate triethanolamine, alkyl ether sulfate esters, and amidosulfonates; cationic surfactants such as alkyltrimethylammonium salts, alkylpyridinium salts, alkylquaternary ammonium salts, alkyldimethylbenzylammonium salts, POE alkylamines, alkylamine salts, and polyamine fatty acid derivatives; and amphoteric surfactants such as imidazoline-based amphoteric surfactants and betaine-based surfactants, within a range that does not pose problems with stability and skin irritation.

[0037] The above-mentioned moisturizers are not particularly limited and include, for example, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, carotenoid acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, rosehip extract, yarrow extract, sweet clover extract, and the like.

[0038] The above-mentioned higher alcohols are not particularly limited, and examples include linear alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, and cetostearyl alcohol, as well as branched alcohols such as monostearyl glycerol ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, and octyldodecanol.

[0039] Examples of polyhydric alcohols include propylene glycol, 1,3-butylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, propanediol, and 1,2-hexanediol.

[0040] The metal ion chelating agent is not particularly limited and can be any of the following: 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonic acid, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, EDTA, etc.

[0041] The UV shielding agent is not particularly limited and includes, for example, benzoic acid-based UV shielding agents such as para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, and N,N-dimethyl PABA butyl ester; anthranilic acid-based UV shielding agents such as homomenthyl-N-acetylantranilate; amyl salicylate, menthyl salicylate, homomenthyl salicylate Salicylic acid-based UV shielding agents such as silates, octyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanolphenyl salicylate; 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, and isoamyl-p-methoxy cinnamate. Cinnamic acid-based UV shielding agents such as methyl 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenyl cinnamate, 2-ethylhexyl-α-cyano-β-phenyl cinnamate, glyceryl mono-2-ethylhexanoyl-diparamethoxycinnamate; 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2 Benzophenone-based UV shielding agents such as 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'-phenylbenzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, and 4-hydroxy-3-carboxybenzophenone;Examples include 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, urocanic acid, ethyl urocanic acid, 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.

[0042] Other drug components are not particularly limited and may include, for example, vitamins such as vitamin A oil, retinol, retinyl palmitate, inositol, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, DL-α-tocopherol nicotinate, magnesium ascorbate phosphate, 2-O-α-D-glucopyranosyl-L-ascorbic acid, vitamin D2 (ergocasciferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, and biotin; hormones such as estradiol and ethinylestradiol; amino acids such as arginine, aspartic acid, cystine, cysteine, methionine, serine, leucine, and tryptophan; anti-inflammatory agents such as allantoin and azulene, whitening agents such as arbutin; astringents such as tannic acid; cooling agents such as L-menthol and camphor, as well as sulfur, lysozyme chloride, and pyridoxine chloride.

[0043] The types of extracts are not particularly limited, and examples include Houttuynia cordata extract, Phellodendron amurense extract, Melilotus extract, Lamium album extract, Licorice extract, Peony extract, Soapwort extract, Luffa gourd extract, Cinchona extract, Saxifraga stolonifera extract, Sophora flavescens extract, Nuphar japonica extract, Fennel extract, Primrose extract, Rose extract, Rehmannia glutinosa extract, Lemon extract, Lithospermum erythrorhizon extract, Aloe vera extract, Calamus root extract, Eucalyptus extract, Horsetail extract, Sage extract, Thyme extract, Tea extract, Seaweed extract, Cucumber extract, Clove extract, Raspberry extract, Melissa extract, Carrot extract, Horse chestnut extract, Peach extract, Peach leaf extract, Mulberry extract, Cornflower extract, Witch hazel extract, Placenta extract, Thymus extract, Silk extract, Licorice extract, etc.

[0044] Examples of the various powders mentioned above include lustrous coloring pigments such as red iron oxide, yellow iron oxide, black iron oxide, titanium mica, iron oxide-coated titanium mica, and titanium oxide-coated glass flakes; inorganic powders such as mica, talc, kaolin, and sericite; and organic powders such as polyethylene powder, nylon powder, cross-linked polystyrene, cellulose powder, and silicone powder. Preferably, in order to improve functional properties and cosmetic durability, some or all of the powder components are hydrophobized using known methods with substances such as silicones, fluorine compounds, metal soaps, oils, and acyl glutamates. Alternatively, composite powders that do not fall under the category of inorganic powders that have undergone the above surface hydrophobization treatment may be mixed and used. [Examples]

[0045] The present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In the examples and comparative examples, unless otherwise specified, "%" means mass%.

[0046] (Examples 1-2, Comparative Examples 1-3: Sunscreen lotion) The sunscreen lotions of Examples 1-2 and Comparative Examples 1-3 were obtained from the compositions shown in Table 1 using the following manufacturing methods. The units of the values ​​in the table are in mass percent. (Manufacturing method) 1. Dissolve and mix b uniformly. 2. Add a to b while stirring with a disperser mixer and mix uniformly to form a dispersion. 3. Add c to a+b and mix uniformly.

[0047] <Evaluation Method: Appearance (Distribution State)> The dispersion state of the sunscreen lotions obtained in Examples 1-2 and Comparative Examples 1-3 was visually observed immediately after manufacturing and after storage at 45°C for one month. A circle (○) indicated uniform dispersion, a triangle (△) indicated slight powder aggregation, and a cross (×) indicated significant powder aggregation. The results are shown in Table 1.

[0048] <Evaluation method: UV protection effect> The sunscreen lotions obtained in Examples 1-2 and Comparative Examples 1-3 were diluted 10,000 times with purified water and placed in a quartz cell (10 mm path length cell). The absorbance was then measured using a UV-Vis spectrophotometer (JASCO V-750 spectrophotmeter). The results are shown in Figure 1.

[0049] [Table 1] (Note 1): MTX-05OTS (particle size 10 nm, manufactured by Teika Corporation) (Note 2): MTY-100SAS (particle size 15 nm, manufactured by Teika Corporation) (Note 3): MT-100SA (particle size 15nm, manufactured by Teika Corporation) (Note 4): NIKKOL OTP-100 (manufactured by Nikko Chemicals Co., Ltd.) (Note 5): KF-6043 (HLB: 14.5, manufactured by Shin-Etsu Chemical Co., Ltd.) (Note 6): ARON AC-1000 (manufactured by Nikko Chemicals Co., Ltd., solid content concentration 40% by mass) (Note 7): Yodzol GH800F (manufactured by AkzoNobel, solid content concentration 45% by mass)

[0050] The results shown in Table 1 clearly demonstrate that the sunscreen cosmetic of the present invention exhibits good dispersion immediately after manufacturing and after storage at 45°C for two weeks. Furthermore, the results shown in Figure 1 show that the sunscreen cosmetic of the present invention has a higher UV protection effect compared to sunscreen cosmetics that do not use a film-forming polymer emulsion.

[0051] (Example 3: Oil-in-water type sunscreen) (Ingredients) (%) 1. Polyglyceryl-10 Pentastearate 0.8 2. Sorbitan sesquiisostearate 0.2 3. Behenyl alcohol 2.0 4. Alkyl benzoate 20.0 5.Wednesday 13.5 6. Sodium stearoylmethyltaurate 0.5 7.2% xanthan gum aqueous solution (Note 8) 20.0 8. Glycerin 3.0 9.Wednesday 14.5 10.1,3-Butylene glycol 5.0 11. Sodium di-2-ethylhexyl sulfosuccinate (Note 4) 2.0 12. Octyltriethoxysilane-treated zinc oxide fine particles (Note 9) 15.0 13. Phenoxyethanol 0.5 14. Polymer Emulsion C (Note 10) 3.0 (Note 8): Echogum T (manufactured by CP Kelco US) (Note 9): MZX-508OTS (particle size 25 nm, manufactured by Teika Corporation) (Note 10): Daitozol 5000STY (manufactured by Daito Chemical Industries, Ltd., solid content concentration 50% by mass) (Manufacturing method) a: Mix ingredients 9-11 uniformly. b: Add component 12 to a while stirring with a disperser mixer and mix uniformly to form a dispersion. c: Heat ingredients 1-4 to 80°C and mix them uniformly. d: Heat ingredients 5-8 to 80°C and mix them uniformly. While stirring e:d, gradually add c and mix until uniform. f: Cool the mixture to room temperature. Mix g:b and f uniformly. h: Mix ingredients 13 and g uniformly. i: Mix component 14 and h uniformly. The oil-in-water sunscreen obtained as described above had good spreadability, provided a refreshing and invigorating feel, offered high UV protection, and exhibited excellent stability without powder aggregation or sedimentation over time.

[0052] (Example 4: Water-based gel sunscreen) (Ingredients) (%) 1.Purified water 35.5 2,1,3-Butylene glycol 5.0 3. Sodium di-2-ethylhexyl sulfosuccinate (Note 4) 4.0 4. Isostearic acid-treated titanium dioxide microparticles (Note 11) 20.0 5.2% Polyacrylate Crosspolymer-6 Aqueous Solution (Note 12) 30.0 6. Phenoxyethanol 0.5 7. Polymer emulsion D (Note 13) 5.0 (Note 11): MT-10EX (particle size 10 nm, manufactured by Teika Corporation) (Note 12): SEPIMAX ZEN (manufactured by SEPPIC Corporation) (Note 13): Vinysol 2140L (manufactured by Daido Chemical Industries, Ltd., solid content concentration 45% by mass) (Manufacturing method) a: Mix ingredients 1-3 uniformly. b:a and component 4 were placed in a mayonnaise jar, and an appropriate amount of φ1.5 glass beads were added. After dispersion using a paint shaker, the beads were separated and the dispersion was extracted. c: Mix components 5, 6 and b uniformly. d: Mix components 7 and c uniformly. The resulting water-based gel sunscreen spread easily, provided a refreshing and invigorating feel, offered high UV protection, and exhibited excellent stability with no powder aggregation or sedimentation over time.

[0053] (Example 5: Oil-in-water UV makeup base) (Ingredients) (%) 1. Polyglyceryl-10 Pentastearate 0.8 2. Sorbitan sesquiisostearate 0.2 3. Behenyl alcohol 2.0 4. Alkyl benzoate 20.0 5.Wednesday 13.5 6. Sodium stearoylmethyltaurate 0.5 7.2% xanthan gum aqueous solution (Note 8) 20.0 8. Glycerin 3.0 9.Wednesday 15.0 10.1,3-Butylene glycol 5.0 11. Sodium di-2-ethylhexyl sulfosuccinate (Note 4) 1.5 12. Octyltriethoxysilane-treated fine particle titanium dioxide (Note 1) 10.0 13. Octyltriethoxysilane-treated titanium dioxide (Note 14) 3.5 14. Octyltriethoxysilane-treated red iron oxide (Note 15) 0.4 15. Octyltriethoxysilane-treated yellow iron oxide (Note 16) 1.0 16. Octyltriethoxysilane-treated black iron oxide (Note 17) 0.1 17. Phenoxyethanol 0.5 18. Polymer Emulsion E (Note 18) 3.0 (Note 14): OTS-2 CR-50 (manufactured by Daito Chemical Industries Co., Ltd.) (Note 15):OTS-2 R-516P (manufactured by Daito Kasei Kogyo Co., Ltd.) (Note 16): OTS-2 YELLOW LL-100P (manufactured by Daito Chemical Industries Co., Ltd.) (Note 17): OTS-2 BL-100P (manufactured by Daito Chemical Industries Co., Ltd.) (Note 18): BAYCUSAN C1000 (manufactured by Bayer MaterialScience AG, solid content concentration 40% by mass) (Manufacturing method) a: Mix ingredients 9-11 uniformly. b: Add components 12-16 to a while stirring with a disperser mixer, mix uniformly to form a dispersion. c: Heat ingredients 1-4 to 80°C and mix them uniformly. d: Heat ingredients 5-8 to 80°C and mix them uniformly. While stirring e:d, gradually add c and mix until uniform. f: Cool the mixture to room temperature. Mix g:b and f uniformly. h: Mix ingredients 17 and g uniformly. i: Mix component 18 and h uniformly. The oil-in-water UV makeup base obtained as described above spreads easily, provides a fresh and refreshing feel, has high UV protection, and exhibits excellent stability without powder aggregation or sedimentation over time. [Industrial applicability]

[0054] This invention provides a sunscreen cosmetic with a fresh and refreshing feel, water resistance, high dispersibility and UV protection effect, and a method for producing the same, and has great industrial applicability.

Claims

1. The following components (A), (B), and (C); (A) Surface hydrophobized fine particle metal oxide (B) Dialkyl sulfosuccinate (C) Film-forming polymer emulsion A sunscreen cosmetic characterized by containing the following:

2. A method for producing a sunscreen cosmetic according to claim 1, characterized by comprising the step of pre-dispersing component (A) according to claim 1 in water or an aqueous medium containing a water-soluble component, using component (B) according to claim 1 as a dispersant.

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