Emulsified sunscreen cosmetic and method for producing emulsified sunscreen cosmetic

Abstract

To provide an emulsified sunscreen cosmetic having high ultraviolet shielding effect by combining an aqueous dispersion of surface-hydrophobized fine metal oxide particles dispersed in water and an oily dispersion of surface-hydrophobized fine metal oxide particles dispersed in oil.SOLUTION: This production method includes a step of mixing (i) an aqueous phase including an aqueous dispersion of surface-hydrophobized fine metal oxide particles dispersed in water or the aqueous dispersion itself and (ii) an oil phase including an oily dispersion of surface-hydrophobized fine metal oxide particles dispersed in oil or the oily dispersion itself. This production method provides an emulsified sunscreen cosmetic having high ultraviolet shielding effect, with fine metal oxide particles dispersed in both the internal phase and the external phase.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an emulsified sunscreen cosmetic having a high ultraviolet ray shielding effect and a method for producing the same, which uses a water dispersion in which surface-hydrophobized fine particle metal oxide is dispersed in water and an oil dispersion containing surface-hydrophobized fine particle metal oxide in combination.

Background Art

[0002] Sunscreen cosmetics are roughly classified into cosmetics containing an organic ultraviolet absorber and cosmetics containing an inorganic ultraviolet shielding agent. Since organic ultraviolet absorbers are mainly transparent to semi-transparent liquids, oils, and solids dissolved in water, they have high transparency when formulated in cosmetics and form a coating film without a sense of incongruity. However, since they are absorbed by the skin, there are concerns about their safety. On the other hand, inorganic ultraviolet shielding agents are mainly fine particle metal oxides having an average particle diameter of 0.1 μm or less, and have relatively high safety because they shield ultraviolet rays on the skin surface. However, due to their high refractive index, they have low transparency, and when applied to the skin, there may be roughness or astringency. For these reasons, there has been a demand for a sunscreen cosmetic that is excellent in usability and transparency, and has a high ultraviolet ray shielding effect and safety.

[0003] By improving the dispersibility of the inorganic ultraviolet shielding agent in the sunscreen cosmetic, it becomes possible to obtain a stronger ultraviolet ray shielding effect. As a technique for more effectively extracting the ultraviolet ray shielding effect by improving the dispersion of the inorganic ultraviolet shielding agent, for example, methods such as blending a dispersant in the product and surface-treating the powder surface with an inorganic or organic substance are well known. Such methods control the wettability between the inorganic ultraviolet shielding agent powder and the oil or water to increase the dispersion, but the dispersion effect is not very high, and there is a problem that aggregation occurs over time. In addition, a method has been proposed in which an oil and a powder are forcibly highly dispersed in advance using a device called a wet mill such as a bead mill or a sand grinder mill, and a certain dispersion effect has been obtained, but it is only a temporary dispersion effect, and there is still a problem that aggregation occurs over time. (See, for example, Patent Document 1, Patent Document 2, and Patent Document 3)

[0004] On the one hand, as an example of blending fine particle metal oxides into an emulsified sunscreen cosmetic, Patent Document 4 discloses a sunscreen cosmetic containing fine particle titanium oxide, fine particle zinc oxide, and spherical powder. Here, when a dispersion of fine particle titanium oxide, fine particle zinc oxide, etc. forms an emulsion, the two types of fine particle metal oxides are both blended in the same phase, either the internal phase (dispersed substance) or the external phase (dispersion medium), and it is difficult to blend a large amount of fine particle metal oxides.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide an emulsified sunscreen cosmetic having a high ultraviolet ray shielding effect and a method for producing the same, which use in combination an aqueous dispersion in which specific surface-hydrophobized fine particle metal oxides are dispersed in water and an oily dispersion in which surface-hydrophobized fine particle metal oxides are dispersed in oil.

Means for Solving the Problems

[0007] As a result of intensive research to achieve the above object, the inventors of the present invention have found that an emulsified sunscreen cosmetic with a high ultraviolet ray shielding effect in which fine particle metal oxides are dispersed in both the internal phase and the external phase can be obtained by using a water dispersion in which the surface-hydrophobized fine particle metal oxides are used with either dialkyl sulfosuccinate or alkyl sulfacetate as a dispersant and an oil dispersion in which the surface-hydrophobized fine particle metal oxides are dispersed in oil in combination, and thus the present invention has been completed.

[0008] That is, the emulsified sunscreen cosmetic is characterized by containing the following components (A) and (B). (A) The following components (a1) to (a3) (a1) Surface-hydrophobized fine particle metal oxides (a2) Dialkyl sulfosuccinate or alkyl sulfacetate (a3) Water A water dispersion composition containing them (B) An oil dispersion composition containing surface-hydrophobized fine particle metal oxides

[0009] Furthermore, the method for producing the emulsified sunscreen cosmetic of the present invention is a production method characterized by blending the above component (A) into the aqueous phase or using it as the aqueous phase, blending the above component (B) into the oil phase or using it as the oil phase, and mixing these aqueous phase and oil phase to produce the emulsified sunscreen cosmetic. [Effect of the Invention]

[0010] The emulsified sunscreen cosmetic of the present invention has a high ultraviolet ray shielding effect in which fine particle metal oxides are dispersed in both the internal phase and the external phase. [Brief Description of the Drawings]

[0011]

Figure 1

Figure 2

Mode for Carrying Out the Invention

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

[0013] The fine particle metal oxide used for the component (a1) in the component (A) of the present invention is preferably at least one 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 ray protection effect, more preferably at least one selected from the group consisting of fine particle zinc oxide, fine particle titanium oxide, and fine particle cerium oxide, and still more preferably at least one selected from the group consisting of fine particle zinc oxide and fine particle titanium oxide. These fine particle metal oxides may be used in combination of two or more.

[0014] The fine particle metal oxide used for the component (a1) in the component (A) of the present invention may be a composite powder whose surface is coated with other inorganic materials. The surface treatment material in that case may be a known inorganic surface treatment material, and examples thereof include zinc oxide, titanium oxide, cerium oxide, iron oxide, barium sulfate, hydrous silicic acid, silica, aluminum hydroxide, alumina, and the like. The coating amount is preferably 1% by mass to 25% by mass with respect to the fine particle metal oxide.

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

[0016] As a method for surface hydrophobization treatment of the fine particle metal oxide used in the component (a1) in the component (A) of the present invention, there is no particular limitation, and known methods can be used. The surface hydrophobization treatment is a treatment for reducing the affinity of the fine particle metal oxide surface with water. After the treatment, surface treatment with a material that is easily soluble in water or a material that is dispersed in water does not fall within the scope of the "surface hydrophobization treatment" of the present invention.

[0017] More specifically, examples of the above surface hydrophobization treatment include treatment with a surface treatment agent such as silicone oil, fatty acid, alkoxysilane (for example, alkylalkoxysilane, etc.). These surface treatments may be carried out alone or in combination. Examples of the silicone oil include so-called straight silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane (hydrogen dimethicone), and so-called branched silicone oils such as triethoxysilylethylpolydimethylsiloxyethyldimethicone. Examples of the fatty acid include stearic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, etc. Examples of the alkoxysilane include alkylalkoxysilane, arylalkoxysilane, etc., and include methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, decyltrimethoxysilane, etc. Among these, from the viewpoint of being able to make the dispersibility in water better, 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, and among them, it is more preferable to use octyltriethoxysilane.

[0018] In the surface hydrophobization treatment of the above-mentioned fine particle metal oxide, it is preferable that the surface hydrophobization treatment is carried out at a ratio of 1 to 12% by mass, 2 to 12% by mass based on the total amount of the inorganic powder after the treatment. By being above the above lower limit, sufficient hydrophobicity is ensured, and by being below the above upper limit, the cost benefit due to the saturation of the hydrophobic effect can be enjoyed.

[0019] As a treatment method for obtaining the above-mentioned surface hydrophobized fine particle metal oxide, a surface treatment agent is dissolved or dispersed in an appropriate organic solvent, and after the mixed solution is stirred and mixed with the required powder, the organic solvent is removed to obtain a surface hydrophobized fine particle metal oxide. Examples of the organic solvent used here 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] Component (A) of the present invention preferably contains component (a1) at a ratio of 10 to 60% by mass, 15 to 55% by mass, or 20 to 50% by mass based on the total amount of component (A). When the ratio of component (a1) is within the above range, the dispersibility of the component (A) aqueous dispersion becomes even better.

[0021] The dialkyl sulfosuccinate, which is the component (a2) in the component (A) of the present invention, can be obtained, for example, by reacting an alcohol with maleic anhydride to form a diester and then sulfating it. The alcohol used is preferably a linear or branched alcohol having 6 to 22 carbon atoms, more preferably a linear or branched alcohol having 6 to 12 carbon atoms. The alcohol may be a saturated alcohol or an unsaturated alcohol, but a saturated alcohol is preferred. Examples of the alcohol used include hexanol, octanol, decanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, 2-ethylhexanol, 2-methyldodecanol, etc. Among them, the alcohol used is preferably 2-ethylhexanol, hexanol, octanol, decanol or lauryl alcohol. Examples of the salt of the dialkyl sulfosuccinate include alkali metals such as sodium and potassium; lower alkanolamines such as monoethanolamine, diethanolamine and triethanolamine; ammonia, etc. Among them, it is preferable to use alkali metal salts such as sodium and potassium, and more preferably sodium salt. Also, commercially available products of dialkyl sulfosuccinate can be used.

[0022] Each of the two alkyl groups constituting the dialkyl sulfosuccinate is preferably an independent linear or branched alkyl group having 6 to 22 carbon atoms, more preferably a linear or branched alkyl group having 6 to 12 carbon atoms. Specific examples of the alkyl group include n-hexyl group, n-octyl group, 2-ethylhexyl group, n-decyl group, lauryl group, myristyl group, stearyl group, etc. Specific examples of the dialkyl sulfosuccinate include, for example, sodium dihexyl sulfosuccinate, sodium di(2-ethylhexyl) sulfosuccinate, sodium dilauryl sulfosuccinate, etc., and sodium di(2-ethylhexyl) sulfosuccinate is particularly preferred.

[0023] Furthermore, the alkylsulfacetate, which is the component (a2) in the component (A) of the present invention, is an ester salt of an alcohol (ROH) and sulfacetic acid (C 2 H 4 O 5 S). Examples of the alkylsulfacetate include salts of alkylsulfacetic acid in which the number of carbon atoms of the alkyl group (R of the above alcohol) is 8 to 20 (preferably 10 to 20, 10 to 18, or 10 to 16). Examples of the salt of the alkylsulfacetate include alkali metals such as sodium and potassium; lower alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; ammonia, etc. Among them, alkali metal salts such as sodium and potassium, and more preferably, a sodium salt is preferably used. In addition, commercially available products can be used as the alkylsulfacetate. Examples of the alkylsulfacetate preferably include sodium caprylsulfacetate, sodium laurylsulfacetate, sodium myristylsulfacetate, and more preferably, sodium laurylsulfacetate. From the viewpoint of improving dispersibility, it is particularly preferable that the component (a2) is sodium di-2-ethylhexyl sulfosuccinate and / or sodium laurylsulfacetate. The component (a2) may be used alone or in combination of two or more.

[0024] The content of the component (a2) in the component (A) of the present invention is appropriately set. In the component (A), for example, it is 1 to 10% by mass or less, preferably 3 to 8% by mass or less, may be 4 to 7% by mass or less, or may be 5 to 6% by mass or less. If it is 1% by mass or more, the dispersibility of the surface-hydrophobized fine particle metal oxide in water becomes better. If it is 10% by mass or less, when the component (A) is blended into a cosmetic, the usability of the cosmetic becomes better.

[0025] Component (A) of the present invention preferably does not contain components other than components (a1), (a2), and (a3) in a proportion exceeding 20% by mass in component (A). However, within a range that does not impair the performance of the aqueous dispersion, the aqueous dispersion may contain other components in a proportion of 20% by mass or less, more preferably 10% by mass or less, and may be 5% by mass or less, 3% by mass or less, 1% by mass or less, or 0% by mass. However, it is preferable not to add compounds or the like that may impair the stability of the aqueous dispersion.

[0026] The components that may be added are not particularly limited, and examples include polyhydric alcohols and preservatives. That is, the dispersion composed of the above components may deteriorate depending on the storage conditions and storage period. To prevent such deterioration, polyhydric alcohols and preservatives may be added. Such polyhydric alcohols and preservatives are not particularly limited. For example, polyhydric alcohols include propylene glycol, 1,3-butylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, propanediol, 1,2-hexanediol, and the like. The polyhydric alcohol may be used alone or in combination of two or more. Examples of the preservative include para-benzoic acid esters such as methyl paraoxybenzoate, sodium benzoate, phenoxyethanol, and sodium dehydroacetate. The preservative may be used alone or in combination of two or more. These can be added for each component within a range that exhibits preservative performance and does not adversely affect the performance of the dispersant.

[0027] The above-mentioned polyhydric alcohols and preservatives can be, for example, 20% by mass or less, or 15% by mass or less, more preferably 10% by mass or less, 5% by mass or less, 3% by mass or less, 1% by mass or less, or 0.5% by mass or less in total with respect to component (A). Among them, it is particularly preferable that the aqueous dispersion contains a polyhydric alcohol such as propylene glycol, 1,3-butylene glycol, dipropylene glycol, pentylene glycol, hexylene glycol, propanediol, 1,2-hexanediol, etc., and preferably contains at least one selected from the group consisting of 1,3-butylene glycol, dipropylene glycol, pentylene glycol, and 1,2-hexanediol, and particularly preferably contains at least one selected from the group consisting of 1,3-butylene glycol, pentylene glycol, and 1,2-hexanediol. The above polyhydric alcohols are often used in cosmetics as humectants, but also have the effect as preservatives because of their antibacterial properties.

[0028] In addition to the above, a pH adjuster and a sequestering agent may be added to component (A). Examples of the pH adjuster include buffers such as lactic acid-sodium lactate, citric acid-sodium citrate, succinic acid-sodium succinate, etc., and examples of the sequestering agent include 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonate, disodium edetate, trisodium edetate, tetrasodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, trisodium ethylenediaminehydroxyethyltriacetate, etc.

[0029] Any known method can be used for the dispersion method for obtaining component (A) of the present invention as long as it can disperse uniformly. Various dispersers such as a wet bead mill, a homomixer, a disper, a kneader, a kneading extruder, a roll mill, etc. can be used, but a wet bead mill is more preferable.

[0030] The blending amount of the component (A) in the emulsified sunscreen cosmetic of the present invention is preferably 2% by mass to 70% by mass.

[0031] The oil-based dispersion composition containing the surface-hydrophobized fine particle metal oxide which is the component (B) of the present invention is not particularly limited, but is one equivalent to the component (a1) dispersed in various oil agents using a dispersant. In addition, in the component (B), in addition to the surface-hydrophobizing agent of the component (a1), it is also possible to use an organic titanate compound, a fluorine compound, a metal soap, an oil agent, an acylglutamate, etc.

[0032] As the dispersant in the component (B) of the present invention, a lipophilic nonionic surfactant is used. Specifically, when the dispersion medium is silicone oil, polyether-modified silicone, polyether / alkyl co-modified silicone, polyglycerin-modified silicone, polyglycerin / alkyl co-modified silicone, silicone-modified acrylic resin such as acrylic / silicone graft or block copolymer, etc. can be mentioned. When it is a hydrocarbon-based oil agent, polyhydroxystearic acid, glyceryl hydroxystearate, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, polyglyceryl-2 tetraisostearate, erythrityl triethylhexanoate, sorbitan sesquisoisostearate, etc. can be mentioned. In addition, only one kind of these dispersants can be used, or two or more kinds can be used in combination with an arbitrary blend.

[0033] The oil agent (dispersion medium) in component (B) of the present invention is, for example, hydrocarbons such as squalane, liquid paraffin, light liquid isoparaffin, heavy liquid isoparaffin, isobutene, hydrogenated polyisobutene, isohexadecane, isodecane, isododecane, etc., silicones such as dimethicone, methylphenyl silicone, cyclomethicone, decamethylcyclopentasiloxane, etc., monoester oils such as isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, tricyclodecane methyl isononanoate, (caprylic acid / capric acid) palm alkyl, hexyl laurate, methylheptyl laurate, caprylyl laurate, decyl laurate, isopropyl myristate, methylheptyl myristate, 2-hexyldecyl myristate, octyldodecyl myristate, isopropyl palmitate, methylheptyl palmitate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, ethyl isostearate, isopropyl isostearate, isobutyl isostearate, decyl isostearate, methylheptyl isostearate, 2-hexyldecyl isostearate, 2-ethylhexyl hydroxystearate, octyldodecyl oleate, oleyl oleate, octyldodecyl ricinoleate, octyl paramethoxycinnamate, alkyl benzoate, glyceryl isostearate, etc.; diester oils such as di(caprylic acid / capric acid) propanediol, neopentyl glycol diisononanoate, neopentyl glycol dicaprate, glyceryl diisostearate, polyglyceryl diisostearate, propanediol diisostearate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di(cholesteryl / behenyl / octyldodecyl) lauroyl glutamate, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, neopentyl glycol dioctanoate, etc.; triester oils such as trimethylolpropane triisostearate, diglyceryl triisostearate, diglyceryl triisostearate, glyceryl tri(capryl / caprate), glyceryl trioctanoate, macadamia nut oil, olive oil, castor oil, jojoba oil, avocado oil, sunflower oil, etc.;Examples of esters include pentaerythrityl tetraoctanoate, diglyceryl tetraisostearate, dipentaerythrityl tetraisostearate, pentaerythritol tetraisostearate, etc.; fatty acids such as stearic acid, lauric acid, myristic acid, palmitic acid, isostearic acid, isopalmitic acid, behenic acid, oleic acid, etc.; and higher alcohols such as behenyl alcohol, cetyl alcohol, oleyl alcohol, octadecyl alcohol, etc. In addition, only one type of these oils can be used, or two or more types can be used in any combination.

[0034] To obtain component (B) of the present invention, the same dispersion method as that for component (A) can be used.

[0035] The content of component (B) in the emulsified sunscreen cosmetic of the present invention is preferably 2% by mass to 70% by mass.

[0036] The emulsified sunscreen cosmetic of the present invention can be obtained by mixing the above component (A) and cosmetic components to form an aqueous phase, or using component (A) directly as the aqueous phase, mixing the above component (B) and cosmetic components to form an oil phase, or using component (B) directly as the oil phase, and then mixing these aqueous and oil phases. In addition, in order to improve the storage stability of the emulsified sunscreen cosmetic of the present invention, a surfactant described below can also be used together with component (A) and component (B).

[0037] Examples of the surfactant include lipophilic nonionic surfactants and hydrophilic nonionic surfactants. The nonionic surfactant is not particularly limited. 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 ether, polyoxyethylene phytosterol ether, polyoxyethylene cholestanol ether, polyoxyethylene cholesteryl ether, alkyl glyceryl ether-modified silicone, polyether-modified silicone, polyoxyalkylene-alkyl co-modified silicone, polyoxyalkylene-fluoroalkyl co-modified silicone, etc. can be mentioned.

[0038] Examples of other surfactants include anionic surfactants such as fatty acid soaps, higher alkyl sulfate ester salts, POE lauryl sulfate triethanolamine, alkyl ether sulfate ester salts, and amidosulfonate salts; cationic surfactants such as alkyltrimethylammonium salts, alkylpyridinium salts, alkyl quaternary 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 amphoteric surfactants may be blended within a range where there are no problems with stability and skin irritation.

[0039] The emulsified sunscreen cosmetic thus obtained can disperse fine particle metal oxides in both the internal phase and the external phase, and is preferable in that a higher ultraviolet ray shielding effect can be obtained than an emulsified sunscreen cosmetic in which the fine particle metal oxides are dispersed in one phase.

[0040] The emulsified sunscreen cosmetic of the present invention can be provided, for example, as a sunscreen cream, a sunscreen lotion, or a sunscreen milk. Moreover, it can also be used as a foundation, a makeup base, a makeup cosmetic, a hair cosmetic, etc. having a sunscreen effect.

[0041] The emulsified sunscreen cosmetic of the present invention can be in any form of an oil-in-water type cosmetic or a water-in-oil type cosmetic.

[0042] The emulsified sunscreen cosmetic of the present invention may also use any aqueous component and oily component that can be used in the cosmetic field in combination. The above aqueous component and oily component are not particularly limited. For example, they may contain components such as an oil agent, a moisturizing agent, a higher alcohol, a sequestering agent, natural and synthetic polymers, water-soluble and oil-soluble polymers, an ultraviolet screening agent, various extracts, a colorant such as an organic dye, a preservative, an antioxidant, a pigment, a thickener, a pH adjuster, a fragrance, a cooling agent, an antiperspirant, a bactericide, a skin activator, and various powders.

[0043] The above-mentioned oil agent is not particularly limited. For example, natural animal and plant oils and fats (such as olive oil, mink oil, castor oil, palm oil, beef tallow, evening primrose oil, coconut oil, castor oil, cocoa butter, macadamia nut oil, etc.); waxes (such as jojoba oil, beeswax, lanolin, carnauba wax, candelilla wax, etc.); higher alcohols (such as lauryl alcohol, stearyl alcohol, cetyl alcohol, oleyl alcohol, etc.); higher fatty acids (such as lauric acid, palmitic acid, stearic acid, oleic acid, behenic acid, lanolin fatty acid, etc.); higher aliphatic hydrocarbons (such as liquid paraffin, solid paraffin, squalane, petrolatum, ceresin, microcrystalline wax, etc.); synthetic ester oils (such as butyl stearate, hexyl laurate, diisopropyl adipate, diisopropyl sebacate, octyldodecyl myristate, isopropyl myristate, isopropyl palmitate isopropyl myristate, cetyl isooctanoate, neopentyl glycol dicaprate); silicone derivatives (such as silicone oils such as dimethicone, methylphenyl silicone, cyclomethicone, decamethylcyclopentasiloxane, methylphenyl silicone, etc.) can be exemplified. Furthermore, oil-soluble vitamins, preservatives, whitening agents, etc. can also be blended.

[0044] The above-mentioned humectant is not particularly limited. For example, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, extract of Isayobara, extract of English plantain, extract of melilot, etc. can be mentioned.

[0045] The higher alcohol is not particularly limited, and examples thereof include linear alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, and cetostearyl alcohol; branched-chain alcohols such as monostearyl glycerin ether (batyl alcohol), 2-decyltetradecynol, lanolin alcohol, cholesterol, phytosterol, hexyl dodecanol, isostearyl alcohol, and octyldodecanol, etc.

[0046] The sequestering agent is not particularly limited, and examples thereof include 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, etc.

[0047] The natural water-soluble polymer is not particularly limited, and examples thereof include plant-based polymers such as gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (membrillo), algocolloid (cassou extract), starch (rice, corn, potato, wheat), glycyrrhizic acid, etc.; microbial-based polymers such as xanthan gum, dextran, succinoglucan, pullulan, etc.; and animal-based polymers such as collagen, casein, albumin, gelatin, etc.

[0048] The semi-synthetic water-soluble polymer is not particularly limited, and examples thereof include starch-based polymers such as carboxymethyl starch and methyl hydroxypropyl starch, cellulose-based polymers such as methyl cellulose, nitrocellulose, ethyl cellulose, methyl hydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, sodium carboxymethyl cellulose (CMC), crystalline cellulose, and stearoxy hydroxypropyl methyl cellulose, and alginic acid-based polymers such as sodium alginate and propylene glycol alginate ester.

[0049] The synthetic water-soluble polymer is not particularly limited, and examples thereof include vinyl-based polymers such as polyvinyl alcohol, polyvinyl methyl ether, and polyvinyl pyrrolidone, polyoxyethylene-based polymers such as polyethylene glycol 20,000, 40,000, and 60,000, polyoxyethylene polyoxypropylene copolymer-based polymers, acrylic-based polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylamide, polyethyleneimine, cationic polymers, carboxyvinyl polymers, and alkyl-modified carboxyvinyl polymers.

[0050] The inorganic water-soluble polymer is not particularly limited, and examples thereof include bentonite, silicic acid (Al / Mg), silicic acid (Li / Mg / Na), hectorite, and anhydrous silicic acid.

[0051] The ultraviolet light shielding agent is not particularly limited, and examples thereof include para-aminobenzoic acid (hereinafter abbreviated as PABA) such as benzoic acid-based UV screening agents including PABA monoglycerin 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; anthranilic acid-based UV screening agents such as homomethyl-N-acetylanthranilate; salicylic acid-based UV screening agents such as amyl salicylate, menthyl salicylate, homomethyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate; cinnamic acid-based UV screening agents such as ethylhexyl methoxycinnamate, 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, isoamyl-p-methoxy cinnamate, 2-ethoxyethyl-p-methoxy cinnamate, cyclohexyl-p-methoxy cinnamate, ethyl-α-cyano-β-phenyl cinnamate, 2-ethylhexyl-α-cyano-β-phenyl cinnamate, glyceryl mono-2-ethylhexanoyl-diparamethoxy cinnamate; benzophenone-based UV screening agents such as 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-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone;3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, urocanic acid, ethyl urocanate, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, etc. can be mentioned.;

[0052] Other pharmaceutical ingredients are not particularly limited. For example, vitamins such as vitamin A oil, retinol, retinol palmitate, inositol, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, nicotinic acid DL-α-tocopherol, magnesium ascorbate phosphate, 2-O-α-D-glucopyranosyl-L-ascorbic acid, vitamin D2 (ergocalciferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, biotin, etc.; hormones such as estradiol, ethinyl estradiol, etc.; amino acids such as arginine, aspartic acid, cystine, cysteine, methionine, serine, leucine, tryptophan, etc.; anti-inflammatory agents such as allantoin, azulene, etc., skin lightening agents such as arbutin, etc.; astringents such as tannic acid, etc.; cooling agents such as L-menthol, camphor, etc., and sulfur, lysozyme chloride, pyridoxine chloride, etc. can be mentioned.

[0053] The various extraction liquids are not particularly limited. For example, Houttuynia cordata extract, peony root extract, melilot extract, Viola philippica extract, licorice root extract, peony bark extract, soapwort extract, loofah extract, cinchona extract, Saxifraga stolonifera extract, clara extract, kounron extract, Wikstroemia extract, cherry laurel extract, rose extract, angelica extract, lemon extract, citron extract, aloe extract, zedoary root extract, eucalyptus extract, sweet flag extract, sage extract, thyme extract, tea extract, seaweed extract, cucumber extract, clove extract, strawberry extract, Melissa extract, carrot extract, chestnut extract, peach extract, peach leaf extract, mulberry extract, safflower extract, witch hazel extract, placenta extract, thymus extract, silk extract, licorice extract, etc. can be mentioned.

[0054] Examples of the various powders include shiny coloring pigments such as red iron oxide, yellow iron oxide, black iron oxide, mica titanium, iron oxide-coated mica titanium, and titanium oxide-coated glass flakes, inorganic powders such as mica, talc, kaolin, and sericite, and organic powders such as polyethylene powder, nylon powder, crosslinked polystyrene, cellulose powder, and silicone powder. Preferably, in order to improve functional properties and makeup durability, part or all of the powder components are hydrophobically treated with substances such as silicones, fluorine compounds, metal soaps, oils, acyl glutamates, etc. by a known method and then used. Also, composite powders that do not correspond to the above surface-hydrophobized inorganic powders may be mixed and used.

Examples

[0055] The present invention will be described in more detail based on examples, but the present invention is not limited only to these examples. In the examples and comparative examples, unless otherwise specified, “%” means mass %.

[0056] (Production Example 1) Put 45 g of purified water and 5 g of sodium di(2-ethylhexyl) sulfosuccinate (NIKKOL OTP-100, manufactured by Nikko Chemicals Co., Ltd.) into a mayonnaise bottle. Further, add 50 g of a powder obtained by surface-treating fine titanium oxide (MT-05: particle size 10 nm, manufactured by Tayca Corporation) with octyltriethoxysilane (5% by mass) and 100 g of φ1.5 mm glass beads. Disperse with a paint shaker, and after separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0057] (Production Example 2) Put 45 g of purified water and 5 g of sodium di(2-ethylhexyl) sulfosuccinate (NIKKOL OTP-100, manufactured by Nikko Chemicals Co., Ltd.) into a mayonnaise bottle. Further, add 50 g of a powder obtained by surface-treating fine zinc oxide (MZ-500: particle size 25 nm, manufactured by Tayca Corporation) with octyltriethoxysilane (8% by mass) and 100 g of φ1.5 mm glass beads. Disperse with a paint shaker, and after separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0058] (Production Example 3) Put 38 g of decamethylcyclopentasiloxane and 12 g of polyether-modified silicone (KF-6017, manufactured by Shin-Etsu Chemical Co., Ltd.) into a mayonnaise bottle. Further, add 50 g of a powder obtained by surface-treating fine titanium oxide (MT-05: particle size 10 nm, manufactured by Tayca Corporation) with octyltriethoxysilane (5% by mass) and 100 g of φ1.5 mm glass beads. Disperse with a paint shaker, and after separating the beads, a uniform oil-based dispersion with a powder concentration of 50% was obtained.

[0059] (Production Example 4) Put 38 g of decamethylcyclopentasiloxane and 12 g of polyether-modified silicone (KF-6017, manufactured by Shin-Etsu Chemical Co., Ltd.) into a mayonnaise bottle. Further, add 50 g of a powder obtained by surface-treating fine zinc oxide (MZ-500: particle size 25 nm, manufactured by Tayca Corporation) with octyltriethoxysilane (8% by mass) and 100 g of φ1.5 mm glass beads. Disperse with a paint shaker, and after separating the beads, a uniform oil-based dispersion with a powder concentration of 50% was obtained.

[0060] (Production Example 5) 46 g of cetyl ethylhexanoate and 4 g of polyhydroxystearic acid were placed in a mayonnaise bottle. Further, 50 g of fine titanium oxide particles (MT-05: particle size 10 nm, manufactured by Tayca Corporation) surface-treated with octyltriethoxysilane (5% by mass) and 100 g of φ1.5 mm glass beads were added. After dispersing with a paint shaker and separating the beads, a uniform oily dispersion with a powder concentration of 50% was obtained.

[0061] (Production Example 6) 46 g of alkyl benzoate and 4 g of polyhydroxystearic acid were placed in a mayonnaise bottle. Further, 50 g of fine zinc oxide particles (MZ-500: particle size 25 nm, manufactured by Tayca Corporation) surface-treated with octyltriethoxysilane (8% by mass) and 100 g of φ1.5 mm glass beads were added. After dispersing with a paint shaker and separating the beads, a uniform oily dispersion with a powder concentration of 50% was obtained.

[0062] (Production Example 7) 41 g of purified water, 5 g of sodium laurylsulfacetate (NIKKOL LSA-F, manufactured by Nikko Chemicals Co., Ltd.), and 4 g of 1,3-butylene glycol were placed in a mayonnaise bottle. Further, 50 g of fine zinc oxide particles (MZ-500: particle size 25 nm, manufactured by Tayca Corporation) surface-treated with methylhydrogenpolysiloxane (5% by mass) and 100 g of φ1.5 mm glass beads were added. After dispersing with a paint shaker and separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0063] (Production Example 8) 45 g of purified water, 5 g of sodium di-2-ethylhexyl sulfosuccinate (NIKKOL OTP-100, manufactured by Nikko Chemicals Co., Ltd.), and 3 g of pentylene glycol were placed in a mayonnaise bottle. Further, 50 g of pigment-grade titanium oxide (OTS-2 CR-50, manufactured by Daito Kasei Kogyo Co., Ltd.) surface-treated with octyltriethoxysilane (2% by mass) and 100 g of φ1.5 mm glass beads were added. After dispersing with a paint shaker and separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0064] (Production Example 9) Put 45 g of purified water, 5 g of sodium di(2-ethylhexyl) sulfosuccinate (NIKKOL OTP-100, manufactured by Nikko Chemicals Co., Ltd.), and 3 g of pentylene glycol into a mayonnaise bottle. Further, add 50 g of iron(III) oxide, surface-treated with octyltriethoxysilane (2% by mass) (OTS-2 R-516P, manufactured by Daito Kasei Kogyo Co., Ltd.) and 100 g of glass beads with a diameter of 1.5 mm. Disperse using a paint shaker, and after separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0065] (Production Example 10) Put 45 g of purified water, 5 g of sodium di(2-ethylhexyl) sulfosuccinate (NIKKOL OTP-100, manufactured by Nikko Chemicals Co., Ltd.), and 3 g of pentylene glycol into a mayonnaise bottle. Further, add 50 g of iron(III) oxide, surface-treated with octyltriethoxysilane (2% by mass) (OTS-2 YELLOW LL-100P, manufactured by Daito Kasei Kogyo Co., Ltd.) and 100 g of glass beads with a diameter of 1.5 mm. Disperse using a paint shaker, and after separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0066] (Production Example 11) Put 45 g of purified water, 5 g of sodium di(2-ethylhexyl) sulfosuccinate (NIKKOL OTP-100, manufactured by Nikko Chemicals Co., Ltd.), and 3 g of pentylene glycol into a mayonnaise bottle. Further, add 50 g of iron(II,III) oxide, surface-treated with octyltriethoxysilane (2% by mass) (OTS-2 BL-100P, manufactured by Daito Kasei Kogyo Co., Ltd.) and 100 g of glass beads with a diameter of 1.5 mm. Disperse using a paint shaker, and after separating the beads, a uniform aqueous dispersion with a powder concentration of 50% was obtained.

[0067] (Examples 1 to 2, Comparative Examples 1 to 2: water-in-oil sunscreen) Sunscreens of Examples 1 to 2 and Comparative Examples 1 to 2 were obtained by the following production method using the compositions in Table 1. The units of the numerical values in the table are % by weight. (Production Method) 1. Stir A and B respectively to make them uniform. 2. While stirring A, add B little by little and mix uniformly.

[0068]

Table 1

[0069] <Evaluation method: UV protection effect> For the examples and comparative examples, a film with a thickness of 20 μm was formed on quartz glass using an applicator and dried at 35 °C for 60 minutes, and the absorbance was measured with an ultraviolet-visible spectrophotometer (JASCO V-650 spectrophotometer). The results are shown in Figure 1.

[0070] From the results shown in Figure 1, it can be seen that in the emulsified sunscreen cosmetics of the present invention, the ultraviolet protection effect is higher than that in the emulsified sunscreen cosmetics in which the two kinds of fine particle metal oxides are blended in the same phase, either the internal phase (dispersed substance) or the external phase (dispersion medium).

[0071] (Examples 3, Comparative Examples 3-4: Oil-in-water sunscreen) Sunscreens of Example 3 and Comparative Examples 3-4 were obtained by the following production method using the compositions in Table 2. The units of the numerical values in the table are mass%. (Production method) 1. A and B are each uniformly stirred and heated to 80 °C. 2. While B is being stirred, A is gradually added thereto and uniformly mixed. 3. The mixture is cooled to room temperature, and C and D are added thereto and uniformly mixed.

[0072]

Table 2

[0073] The absorbance results of Example 3 and Comparative Examples 3-4 measured by the evaluation method of the ultraviolet protection effect used in Examples 1-2 above are shown in Figure 2.

[0074] From the results shown in Fig. 2, it can be seen that in the emulsified sunscreen cosmetic of the present invention, the ultraviolet protection effect is higher than that in the emulsified sunscreen cosmetic in which the two types of fine particle metal oxides are both incorporated in the same phase, either the internal phase (dispersed phase) or the external phase (dispersion medium), as described above.

[0075] (Example 4: Water-in-oil sunscreen) (Components) 1. Distearyldimonium hectorite 0.6 (%) 2. Decamethylcyclopentasiloxane 24.4 3. Cetyl ethylhexanoate 5.0 4. Oil dispersion of Production Example 3 20.0 5. Purified water 29.5 6. Glycerin 2.5 7. Propanediol 2.5 8. Phenoxyethanol 0.5 9. Aqueous dispersion of Production Example 2 15.0 (Production method) A: Mix Components 1 to 4 and make them uniform. B: Mix Components 5 to 9 and make them uniform. C: While stirring A, add B little by little and mix uniformly. The water-in-oil sunscreen obtained as above had a high ultraviolet protection effect.

[0076] (Example 5: Water-in-oil sunscreen) (Components) 1. Oil dispersion of Production Example 4 60.0 (%) 2. Aqueous dispersion of Production Example 1 40.0 (Production method) While stirring Component 1, add Component 2 little by little and mix uniformly. The water-in-oil sunscreen obtained as above had a high ultraviolet protection effect.

[0077] (Example 6: Oil-in-water foundation) (Components) 1. Polyglyceryl-10 pentastearate 0.8 (%) 2. Sorbitan sesquisoisostearate 0.2 3. Behenyl alcohol 2.0 4. Alkyl benzoate 10.0 5. Oil dispersion of Production Example 6 15.0 6. Water 20.0 7. Sodium stearoyl methyl taurate 0.5 8. 2% xanthan gum aqueous solution (Note 2) 15.0 9. Glycerin 3.0 10. Propanediol 3.0 11. Phenoxyethanol 0.5 12. Aqueous dispersion of Production Example 1 25.0 13. Aqueous dispersion of Production Example 8 (white) 4.3 14. Aqueous dispersion of Production Example 9 (red) 0.5 15. Aqueous dispersion of Production Example 10 (yellow) 0.1 16. Aqueous dispersion of Production Example 11 (black) 0.1 (Note 2): Echo Gum T (manufactured by CP Kelco U.S.) (Production method) A: Mix components 1 to 5, make them uniform, and heat to 80°C. B: Mix components 6 to 10, make them uniform, and heat to 80°C. C: Gradually add A to B while stirring and mix uniformly. D: Cool the mixture to room temperature, add components 11 to 16 thereto, and mix uniformly. The oil-in-water type foundation obtained as described above had a high ultraviolet ray protection effect.

[0078] (Example 7: Oil-in-water type foundation) (Components) 1. Polyglyceryl-10 stearate 1.1 (%) 2. Sorbitan sesquistearate 0.9 3. Cetearyl alcohol 4.0 4. Cetyl ethylhexanoate 10.0 5. Oil dispersion of Production Example 5 15.0 6. Water 27.5 7. 7.2% Aqueous xanthan gum solution (Note 3) 15.0 8. Glycerin 3.0 9. Propanediol 3.0 10. Phenoxyethanol 0.5 11. Aqueous dispersion of Production Example 7 15.0 12. Aqueous dispersion of Production Example 8 (white) 4.3 13. Aqueous dispersion of Production Example 9 (red) 0.5 14. Aqueous dispersion of Production Example 10 (yellow) 0.1 15. Aqueous dispersion of Production Example 11 (black) 0.1 (Note 3): ECO-GUM T (manufactured by CP Kelco U.S.) (Production method) An oil-in-water foundation was obtained by the same production method as in Example 6. The oil-in-water foundation obtained as described above had a high UV protection effect.

Industrial applicability

[0079] The emulsified sunscreen cosmetic of the present invention can provide an emulsified sunscreen cosmetic with a high UV shielding effect in which fine particle metal oxides are dispersed in both the internal phase and the external phase, and has great industrial applicability.

Claims

1. The following components (A) and (B): (A) the following components (a1) to (a3): (a1) Fine particle metal oxide with hydrophobic surface treatment (a2) Dialkyl sulfosuccinate or alkyl sulfoacetate (a3) water Aqueous dispersion composition comprising (B) Oil-based dispersion composition containing fine metal oxide particles subjected to surface hydrophobic treatment 1. An emulsion-type sunscreen cosmetic comprising:

2. 13. A method for producing an emulsion-type sunscreen cosmetic, comprising the steps of: mixing component (A) as claimed in claim 1 with a cosmetic component to form an aqueous phase, or using component (A) as is as the aqueous phase; mixing component (B) as claimed in claim 1 with a cosmetic component to form an oil phase, or using component (B) as is as the oil phase, and mixing the aqueous phase with the oil phase.

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