Surface hydrophobized inorganic powder aqueous dispersion and cosmetics containing the same

Abstract

The objective is to obtain a dispersion of surface-hydrophobized inorganic powder in water. This dispersion is easy to handle because the dispersion medium is water. When used in cosmetics, it can be suitably used when surface-hydrophobized inorganic powder is incorporated into water-based cosmetics. [Solution] A dispersion is obtained by uniformly dispersing surface-hydrophobically treated inorganic powder in water. By using a dispersion that can stably disperse surface-hydrophobically treated inorganic powder in water by using one or more of sebacoylbislauramidolsin 2Na, coconut oil alkyl glucoside hydroxypropyl phosphate sodium and a polyhydric alcohol in combination, a cosmetic product is provided that has high water resistance and a refreshing feel.

Description

Technical Field

[0001] The present invention relates to an aqueous dispersion in which an inorganic powder subjected to surface hydrophobization treatment is stably dispersed in water and a cosmetic containing the same.

Background Art

[0002] Conventionally, when stably dispersing an inorganic powder in water or an aqueous medium, hydrophilic powders or hydrophilized powders have been used. On the other hand, when formulating a hydrophobized powder in water or an aqueous medium, a large amount of anionic surfactants such as alkyl phosphates, polyoxyethylene-added alkyl ether phosphates, and lecithin are used as dispersants, or surfactants derived from natural products (see Patent Document 1) are used to disperse them in water. Furthermore, as a method for improving the dispersibility of powders in water, there is a method of hydrophilizing the powders, for example, the techniques disclosed in Patent Documents 2 to 4. Patent Documents 2 and 3 disclose techniques related to coating treatment with a water-soluble cationic polymer and a low molecular weight organosilicon derivative, and Patent Document 4 discloses a technique for surface treatment with polyethersilane. When such hydrophilic powders are used, they can be easily added to an aqueous composition and the blending amount can also be increased, so there is an advantage that the characteristics of the powders are easily exhibited.

[0003] In recent years, clean beauty has been popular in the cosmetics market, and natural-concept cosmetics containing plant-derived ingredients have become preferred. Generally, "clean" means that products and services should consider the health of humans and the environment, and it also conforms to the recent trend of SDGs (Sustainable Development Goals). This indicates that the components constituting cosmetics should be made of environmentally friendly components and natural-derived components as much as possible.

[0004] Various surfactants are used in cosmetics, but raw materials derived from petroleum tend to be avoided. For this reason, PEG-based surfactants, which use polyethylene glycol (PEG) as their hydrophilic component, tend to be particularly avoided by consumers. Among consumers, the phrase "PEG-free" is also becoming more widespread, referring to products that do not use PEG-based surfactants. [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 [Overview of the project]

[0006] However, the method of dispersing the hydrophobic treated powder in water or an aqueous medium described in Patent Document 1 does not provide sufficient dispersibility or water resistance of the powder, and the methods described in Patent Documents 2 to 4 have the problem that the powder itself is hydrophilic, making it difficult to obtain a coating film with sufficient water resistance as an inorganic powder aqueous dispersion. Furthermore, if a large amount of the above-mentioned dispersant is added when blending the hydrophobic treated powder with water or an aqueous medium, it is similarly difficult to obtain a coating film with sufficient water resistance. This invention has been made in view of the above circumstances, and aims to provide an inorganic powder aqueous dispersion that has high dispersibility of surface-hydrophobized inorganic powder and high water resistance during use, and a cosmetic composition using said aqueous dispersion that has excellent feel and water resistance.

[0007] To achieve the aforementioned objectives, the present inventors conducted diligent research and found that when one or more of sebacoylbislauramidolsin 2Na and coconut oil alkyl glucoside hydroxypropyl phosphate sodium are used in combination with a specific amount of polyhydric alcohol, surface-hydrophobized inorganic powders can be stably dispersed in water, and that using this aqueous dispersion of inorganic powders yields cosmetics with high water resistance and a good feel (e.g., freshness), thus completing the present invention.

[0008] In other words, the surface hydrophobized inorganic powder aqueous dispersion according to the present invention is characterized by containing the following components (A), (B), (C), and (D). (A) Surface hydrophobic treated inorganic powder (B) Disodium sebacoyl bislauramidylsin and / or sodium coconut oil alkyl glucoside hydroxypropyl phosphate (C) Polyhydric alcohol (D)Water

[0009] Furthermore, the cosmetic composition of the present invention is characterized by containing the surface hydrophobized inorganic powder aqueous dispersion of the present invention. [Modes for carrying out the invention]

[0010] Next, specific embodiments of the surface-hydrophobized inorganic powder aqueous dispersion and the cosmetic composition containing the same according to the present invention will be described. In this specification, "X~Y" indicating a range means "X or more, and Y or less." Unless otherwise specified, the operations are carried out under room temperature (20℃~30℃) / relative humidity of 45~55%RH. <Water dispersion> The surface-hydrophobized inorganic powder aqueous dispersion of the present invention exhibits high dispersibility of the surface-hydrophobized inorganic powder, maintains this dispersibility over time, and has high water resistance during use. Furthermore, cosmetics containing this aqueous dispersion have high water resistance and an excellent refreshing feel.

[0011] (Component (A): Surface hydrophobized inorganic powder) The inorganic powder used in component (A) (the mother powder to be hydrophobized) is not particularly limited, and commonly used examples include zinc oxide, titanium oxide, cerium oxide, iron oxide, barium sulfate, calcium carbonate, silica, aluminum hydroxide, alumina, boron nitride, talc, mica, and kaolin. The inorganic powder is preferably at least one selected from the group consisting of titanium oxide, zinc oxide, iron oxide, cerium oxide, and composites thereof, and an inorganic powder having ultraviolet absorption and scattering ability (ultraviolet shielding effect) (hereinafter also referred to as ultraviolet shielding particles) is particularly preferred. The inorganic powder having an ultraviolet shielding effect is particularly preferably at least one selected from the group consisting of zinc oxide, titanium oxide, and cerium oxide. Since inorganic powders having an ultraviolet shielding effect are commonly used in cosmetic applications, they are also preferred because they facilitate incorporation into water-based cosmetics. Furthermore, they are also preferred because they allow for the easy formation of an inorganic thin film with an ultraviolet shielding effect. Among these, zinc oxide and / or titanium oxide are particularly preferred as the inorganic powder. These inorganic powders may also be used in combination of two or more types of inorganic powders.

[0012] The inorganic powder used in the aqueous dispersion of the present invention may be a composite powder in which the surface is coated with other inorganic materials. In this case, the surface treatment material may be any 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 entire inorganic powder.

[0013] The inorganic powder described above preferably has an average particle diameter (hereinafter, when simply referred to as particle diameter in this specification, it refers to the average particle diameter) of 1 to 200 nm, more preferably 10 to 200 nm, and even more preferably 10 to 100 nm. In particular, if the particles are ultraviolet shielding particles, the above average particle diameter is preferred. Ultraviolet shielding particles having such a particle diameter are particularly preferred because they have high visible light transparency and suitable ultraviolet shielding ability. Furthermore, if the inorganic powder is not an ultraviolet shielding particle or if ultraviolet shielding ability is not required, the particle diameter should be the optimal size for using the particles. The particle diameter of the inorganic powder described above was measured by measuring the particle diameter of 200 randomly selected particles using an electron microscope and calculating the average of their primary particle diameters.

[0014] The shape of the inorganic powder described above is not particularly limited, and any shape such as spherical, rod-shaped, needle-shaped, spindle-shaped, or plate-shaped can be used. For rod-shaped, needle-shaped, and spindle-shaped particles, the average particle diameter is defined by the length of the short axis, while for plate-shaped particles, it is defined by the average length of the diagonal of the surface.

[0015] The type of surface hydrophobic treatment for the inorganic powder described above is not particularly limited, and known methods can be used. Surface hydrophobic treatment is a treatment that reduces the affinity of the inorganic powder surface to water, and surface treatment with a material that is easily soluble in water after the treatment does not fall under the "surface hydrophobic treatment" of the present invention.

[0016] More specifically, the above-mentioned surface hydrophobic treatments include treatment with surface treatment agents such as silicone oil, fatty acids, and alkoxysilanes (e.g., alkylalkoxysilanes). These surface treatments may be performed individually or in combination. A preferred embodiment of the present invention is an inorganic powder that has been surface hydrophobic treated with at least one selected from the group consisting of silicone oil, fatty acids, and alkoxysilanes. Examples of silicone oils include so-called straight silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane (hydrogen dimethicone), as well as so-called branched silicone oils such as triethoxysilylethyl polydimethylsiloxyethyl dimethicone. Examples of fatty acids include stearic acid, isostearic acid, lauric acid, myristic acid, and palmitic acid. Examples of alkoxysilanes include alkylalkoxysilanes and arylalkoxysilanes, and include methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, and decyltrimethoxysilane. 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 a surface treatment agent, as this can improve dispersibility in water. Stearic acid and isostearic acid are particularly preferable because they can be selected from naturally derived sources.

[0017] In the above-mentioned surface hydrophobic treatment of inorganic powder, it is preferable that the surface hydrophobic treatment is applied in a proportion of 1 to 12% by mass or 2 to 12% by mass of the total amount of inorganic powder after treatment. If the proportion is above the lower limit, sufficient hydrophobicity is ensured, and if it is below the upper limit, cost benefits due to saturation of the hydrophobic effect can be enjoyed.

[0018] As a treatment method for obtaining the above-mentioned surface-hydrophobized inorganic powder, a surface treatment agent is dissolved or dispersed in a suitable organic solvent, the mixture is stirred and mixed with the required powder, and then the organic solvent is removed to obtain the surface-hydrophobized powder. Examples of the organic solvents 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.

[0019] The aqueous dispersion of the present invention preferably contains component (A) in a proportion of 10 to 60% by mass, 15 to 55% by mass, or 20 to 50% by mass based on the total amount of the aqueous dispersion. When the proportion of component (A) is within the above range, the dispersibility of the aqueous dispersion becomes even better.

[0020] (Component (B): Surfactant having two alkyl chains) Component (B) can be one or both selected from sodium sebacoyl bislauroyl lysine and sodium coconut alkyl glucoside hydroxypropyl phosphate. Using both is preferable because the stability of the obtained aqueous dispersion over time in terms of the dispersion state becomes good.

[0021] Examples of commercially available products of the above-mentioned preferable surfactants include, for example, Amiseif LL-DS-22 manufactured by Ajinomoto Healthy Supply Co., Ltd. as sodium sebacoyl bislauroyl lysine, and Sugaphos 8600 manufactured by Colonial Chemical Inc. as sodium coconut alkyl glucoside hydroxypropyl phosphate.

[0022] The blending amount of component (B) in the aqueous dispersion of the present invention is appropriately set to disperse the surface-hydrophobized inorganic powder, which is component (A), in water. For example, it is 1% by mass or more and 10% by mass or less, and preferably 3% by mass or more and 8% by mass or less. If it is less than 1% by mass, the dispersibility of the surface-hydrophobized inorganic powder in water may deteriorate. If it exceeds 10% by mass, when the aqueous dispersion is blended into a cosmetic, the feel of use of the cosmetic may become heavy.

[0023] When both of component (B) are used in the aqueous dispersion of the present invention, the blending ratio is preferably in the range of 5:1 to 1:5, and more preferably in the range of 4:1 to 1:4 for better dispersibility of component (A) in water.

[0024] (Component (C): Polyhydric alcohol) The polyhydric alcohol, which is component (C), is any compound that has two or more hydroxyl groups in its molecule and is commonly used in cosmetics. Examples of dihydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, 1,3-propanediol, 1,2-hexanediol, and 1,2-pentanediol. Examples of trihydric alcohols include glycerin and trimethylolpropane.

[0025] The amount of component (C) in the aqueous dispersion of the present invention is set appropriately to disperse the surface-hydrophobized inorganic powder, which is component (A), in water, but is preferably 3% by mass or more and 20% by mass or less, and preferably 5% by mass or more and 15% by mass or less. If it is less than 3% by mass, the dispersibility of the surface-hydrophobized inorganic powder in water may be poor, and if it exceeds 20% by mass, the water resistance of the aqueous dispersion and the cosmetic when the aqueous dispersion is incorporated into the cosmetic may be poor.

[0026] The aqueous dispersion of the present invention preferably contains no components other than components (A), (B), (C), and (D) in proportion to more than 10% by mass. However, other components may be contained in proportion to 10% by mass or less of the aqueous dispersion, as long as the performance of the aqueous dispersion is not impaired. More preferably, the proportion should be 5% by mass or less, and it may also be 3% by mass or less, 1% by mass or less, or 0% by mass. However, it is preferable not to add compounds that may impair the stability of the aqueous dispersion.

[0027] Such additives are not particularly limited, but preservatives are one example. That is, dispersions consisting of the above components may spoil depending on storage conditions and storage period. To prevent such spoilage, preservatives may be added. Preservatives are not particularly limited, but examples include parabenzoic acid esters such as methyl parahydroxybenzoate, sodium benzoate, phenoxyethanol, sodium dehydroacetate, etc. These can be added in a range that exhibits preservative performance for each component without adversely affecting the performance of the dispersant.

[0028] The specific amounts of the preservatives mentioned above may be, for example, 3% by mass or less, 1% by mass or less, or 0.5% by mass or less in total relative to the aqueous dispersion. Furthermore, pH adjusters are an example of components that may be added to the aqueous dispersion. Examples of pH adjusters include buffers such as lactate-sodium lactate, citrate-sodium citrate, and succinate-sodium succinate. pH adjusters may be used individually or in combination of two or more. Additionally, metal ion sequestering agents are an example of components that may be added to the aqueous dispersion. Examples of metal ion sequestering 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. Metal ion sequestering agents may be used individually or in combination of two or more. The pH adjusters and metal ion chelating agents mentioned above can be added in a total amount of, for example, 1% by mass or less, or 0.5% by mass or less, relative to the aqueous dispersion.

[0029] Any known method capable of uniform dispersion is acceptable for obtaining the aqueous dispersion of the present invention. Various dispersers such as wet bead mills, homomixers, dispersers, kneaders, kneading extruders, and roll mills can be used, but a wet bead mill is more preferred.

[0030] <Cosmetics> The aqueous dispersion of the present invention can be directly incorporated into cosmetics. In this case, a cosmetic composition can be obtained by mixing the dispersion with various components used in the cosmetic. The amount of aqueous dispersion incorporated into the cosmetic is preferably 2% to 80% by mass.

[0031] The cosmetic composition obtained in this manner can disperse an aqueous dispersion of inorganic powder that has been suitably surface-hydrophobized in an aqueous composition. This makes it possible to obtain an aqueous composition with stable UV protection performance. Furthermore, even in emulsions, the hydrophobized powder can be dispersed in the aqueous phase. Such a special form of cosmetic composition is preferable because it can provide a different feel from conventional cosmetics in which powder is dispersed in an oil phase. Furthermore, cosmetics containing the above-mentioned dispersion exhibit high water resistance, particularly in systems where the aqueous phase is the outer phase, such as aqueous cosmetics and oil-in-water cosmetics. In aqueous cosmetics and oil-in-water cosmetics, the aqueous dispersion can be uniformly present in the outer phase, and therefore, the hydrophobic treated powder is uniformly present in the outer phase. As a result, when applied to the skin, it is easy to form a uniform hydrophobic coating film due to the hydrophobic treated powder. This is thought to contribute to high water resistance. Moreover, for compositions where the outer phase is the aqueous phase, such as aqueous cosmetics and oil-in-water cosmetics, cosmetics can be easily obtained by preparing the composition other than the dispersion and then adding the dispersion to the aqueous phase of the outer phase.

[0032] The above-mentioned cosmetic composition is not particularly limited, and by mixing cosmetic raw materials as needed with the aqueous dispersion of the present invention, ultraviolet protection cosmetics such as sunscreens, base makeup cosmetics such as foundations, point makeup cosmetics such as lipsticks, etc., can be obtained. Among these, it can be used particularly suitably as a sunscreen.

[0033] The above cosmetic composition may be in any form, such as an aqueous cosmetic, an oil-in-water cosmetic, or an oil-in-water cosmetic.

[0034] The above cosmetic composition 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, oils, surfactants, humectants, higher alcohols, metal ion sequestering agents, natural and synthetic polymers, water-soluble and oil-soluble polymers, UV shielding agents, various extracts, colorants such as organic dyes, preservatives, antioxidants, pigments, thickeners, pH adjusters, fragrances, cooling agents, antiperspirants, disinfectants, skin activators, and various powders.

[0035] 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.

[0036] Examples of the above-mentioned surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants. The above-mentioned lipophilic nonionic surfactants are not particularly limited and include, for example, sorbitan fatty acid esters such as sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, sorbitan diglycerol sorbitan penta-2-ethylhexylate, sorbitan diglycerol sorbitan tetra-2-ethylhexylate, glycerin polyglycerin fatty acids such as monocottonseed oil fatty acid glycerin, monoerucate glycerin, sesquioleate glycerin, monostearate glycerin, α,α'-oleate pyroglutamate glycerin, monostearate glycerin malic acid, propylene glycol fatty acid esters such as monostearate propylene glycol, hydrogenated castor oil derivatives, and glycerin alkyl ethers.

[0037] The hydrophilic nonionic surfactant is not particularly limited, and examples include POE sorbitan fatty acid esters such as POE sorbitan monooleate, POE sorbitan monostearate, and POE sorbitan tetraoleate; POE sorbitan fatty acid esters such as POE sorbitan monolaurate, POE sorbitan monooleate, POE sorbitan pentaoleate, and POE sorbitan monostearate; and POE glycerin monostearate, POE glycerin monoisostearate, and POE glycerin triisostearate. POE fatty acid esters such as serine fatty acid esters, POE monooleate, POE distearate, POE monodioleate, ethylene glycol cystearate, POE alkyl ethers such as POE lauryl ether, POE oleyl ether, POE stearyl ether, POE behenyl ether, POE 2-octyldodecyl ether, POE cholestanol ether, POE alkylphenyl ethers such as POE octylphenyl ether, POE nonylphenyl ether, POE dinonylphenyl ether, and brulonine POE-POP alkyl ethers such as POE-POP cetyl ether, POE-POP 2-decyltetradecyl ether, POE-POP monobutyl ether, POE-POP hydrogenated lanolin, POE-POP glycerin ether, tetra-POE-tetraPOP ethylenediamine condensates such as TETRON, POE castor oil, POE hydrogenated castor oil, POE hydrogenated castor oil monoisostearate, POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyroglutamic acid monoisostearate Examples include sterols, POE hydrogenated castor oil derivatives such as POE hydrogenated castor oil maleic acid, POE beeswax / lanolin derivatives such as POE sorbitan beeswax, alkanolamides such as coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, and fatty acid isopropanolamide, POE propylene glycol fatty acid esters, POE alkylamines, POE fatty acid amides, sucrose fatty acid esters, POE nonylphenylformaldehyde condensate, alkylethoxydimethylamine oxide, and trioleyl phosphate.

[0038] Other surfactants may be included, for example, anionic surfactants such as fatty acid soaps, higher alkyl sulfate esters, POE lauryl sulfate triethanolamine, and alkyl ether sulfate esters; 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 in terms of stability and skin irritation.

[0039] 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.

[0040] 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.

[0041] The metal ion chelating agent is not particularly limited, and as mentioned above, examples 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, trisodium ethylenediaminehydroxyethyl triacetate, and the like.

[0042] The above-mentioned natural water-soluble polymers are not particularly limited and include, for example, plant-derived polymers such as gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), algae colloid (cassia extract), starch (rice, corn, potato, wheat), and glycyrrhizic acid; microbial polymers such as xanthan gum, dextran, succinoglucan, and pullulan; and animal-derived polymers such as collagen, casein, albumin, and gelatin.

[0043] The semi-synthetic water-soluble polymers are not particularly limited and include, for example, starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; cellulose-based polymers such as methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, hydroxypropylcellulose, sodium carboxymethylcellulose (CMC), crystalline cellulose, and cellulose powder; and alginate-based polymers such as sodium alginate and propylene glycol alginate ester.

[0044] The water-soluble polymers used in synthesis are not particularly limited and include, for example, vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, and polyvinylpyrrolidone; polyoxyethylene polymers such as polyethylene glycol 20,000, 40,000, and 60,000; polyoxyethylene polyoxypropylene copolymer polymers; acrylic polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylamide; polyethyleneimine; cationic polymers; carboxyvinyl polymers; alkyl-modified carboxyvinyl polymers; and the like.

[0045] The inorganic water-soluble polymer is not particularly limited, and examples include bentonite, silicic acid (Al / Mg), silicic acid (Li / Mg / Na), hectorite, anhydrous silicic acid, etc.

[0046] 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.

[0047] 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, 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.

[0048] 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.

[0049] 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]

[0050] 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%.

[0051] (Example 1) 50g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co.), 5g of 1,3-butylene glycol, and 25g of purified water were placed in a mayonnaise jar. Then, 20g of fine titanium dioxide (MT-150EX: particle size 15nm, manufactured by Teika Co., Ltd.) surface-treated with isostearic acid and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0052] (Example 2) 12.5g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical), 5g of 1,3-butylene glycol, and 62.5g of purified water were placed in a mayonnaise jar. Then, 20g of fine-particle titanium dioxide (MT-150EX: particle size 15nm, manufactured by Teika Co., Ltd.) surface-treated with isostearic acid and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0053] (Example 3) In a mayonnaise jar, 30g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co., Ltd.), 5g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical Co., Ltd.), 5g of 1,2-hexanediol, and 30g of purified water were added. Furthermore, 30g of isostearic acid-surface-treated fine particle titanium dioxide (MT-150EX: particle size 15nm, manufactured by Teika Co., Ltd.) and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0054] (Example 4) 50g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co.), 10g of 1,3-butylene glycol, and 20g of purified water were placed in a mayonnaise jar. Then, 20g of fine-particle titanium dioxide (MTY-100SAS: particle size 15nm, manufactured by Teika Co., Ltd.) surface-treated with methylhydrogenpolysiloxane and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0055] (Example 5) 12.5g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical), 10g of 1,3-butylene glycol, and 37.5g of purified water were placed in a mayonnaise jar. Then, 40g of surface-treated isostearic acid fine particle zinc oxide (MZY-505EX: particle size 25nm, manufactured by Teika) and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0056] (Example 6) In a mayonnaise jar, 40g of 10% sebacoylbislauramidolsin 2Na (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co.), 2.5g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical Co.), 5g of dipropylene glycol, and 22.5g of purified water were added. Furthermore, 30g of stearic acid-surface-treated fine particle titanium dioxide (MT-100TV: particle size 15nm, manufactured by Teika Co.) and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0057] (Example 7) In a mayonnaise jar, 10g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co., Ltd.), 10g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical Co., Ltd.), 10g of 1,3-butylene glycol, and 30g of purified water were added. Furthermore, 40g of surface-treated isostearic acid fine particle zinc oxide (MZY-505EX: particle size 25nm, manufactured by Teika Co., Ltd.) and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0058] (Example 8) 50g of 10% sebacoylbislauramidol 2Na (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co., Ltd.) and 5g of 1,2-pentanediol were placed in a mayonnaise jar. Then, 45g of yellow iron oxide (OTS-2 YELLOW LL-100P, manufactured by Daito Chemical Industries Co., Ltd.) surface-treated with octyltriethoxysilane and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0059] (Example 9) 30g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co.), 5g of 1,2-hexanediol, and 35g of purified water were placed in a mayonnaise jar. Then, 30g of fine titanium dioxide (MT-150EX: particle size 15nm, manufactured by Teika Co., Ltd.) surface-treated with isostearic acid and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0060] (Example 10) 7.5g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical), 5g of 1,2-hexanediol, and 57.5g of purified water were placed in a mayonnaise jar. 30g of isostearic acid-surface-treated fine titanium dioxide particles (MT-150EX: particle size 15nm, manufactured by Teika) and 100g of φ1.5 glass beads were then added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0061] (Example 11) In a mayonnaise jar, 30g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co.), 10g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical Co.), 5g of 1,3-butylene glycol, and 5g of purified water were added. Furthermore, 50g of isostearic acid-surface-treated fine particle titanium dioxide (MT-150EX: particle size 15nm, manufactured by Teika Co.) and 100g of φ1.5 glass beads were added. The mixture was dispersed using a paint shaker, and after separating the beads, a homogeneous aqueous dispersion was obtained.

[0062] (Comparative Example 1) 50g of 10% sebacoylbislauramidolsin disodium (Amisafe LL-DS-22, manufactured by Ajinomoto Healthy Supply Co.) and 30g of purified water were placed in a mayonnaise jar. Then, 20g of fine titanium dioxide particles (MT-150EX: particle size 15nm, manufactured by Teika Co., Ltd.) surface-treated with isostearic acid and 100g of φ1.5 glass beads were added. Dispersion was performed using a paint shaker, and even after separating the beads, a uniform aqueous dispersion could not be obtained.

[0063] (Comparative Example 2) 12.5g of 40% coconut oil alkyl glucoside hydroxypropyl phosphate sodium (Sugaphos 8600, manufactured by Colonial Chemical) and 67.5g of purified water were placed in a mayonnaise jar. Then, 20g of isostearic acid-surface-treated fine titanium dioxide particles (MT-150EX: particle size 15nm, manufactured by Teika) and 100g of φ1.5 glass beads were added. Dispersion was performed using a paint shaker, and even after separating the beads, a uniform aqueous dispersion could not be obtained.

[0064] (Comparative Example 3) 5g of polyoxyethylene behenyl ether (nonionic B-230, manufactured by NOF Corporation), 5g of 1,3-butylene glycol, and 70g of purified water were placed in a mayonnaise jar. Then, 20g of fine titanium dioxide particles (MT-150EX: particle size 15nm, manufactured by Teika Corporation) surface-treated with isostearic acid and 100g of φ1.5 glass beads were added. Dispersion was performed using a paint shaker, and even after separating the beads, a uniform aqueous dispersion could not be obtained.

[0065] (Comparative Example 4) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with polyoxyethylene lauryl ether sodium phosphate (NIKKOL DLP-10, manufactured by Nikko Chemicals Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0066] (Comparative Example 5) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with sodium lauroyl sarcosinate (Soypon SLP, manufactured by Kawaken Fine Chemicals Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0067] (Comparative Example 6) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with potassium laurate (Nonsal LK-2, manufactured by NOF Corporation), but a homogeneous aqueous dispersion could not be obtained.

[0068] (Comparative Example 7) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with sodium lauryl phosphate (NIKKOL SLP-N, manufactured by Nikko Chemicals Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0069] (Comparative Example 8) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with sodium lauroyl methyl taurate (NIKKOL LMT, manufactured by Nikko Chemicals Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0070] (Comparative Example 9) In Comparative Example 3, the same procedure was followed except that polyoxyethylene behenyl ether was replaced with sodium lauryl sulfate (Sinoline 100, manufactured by Shin-Nippon Rika Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0071] (Comparative Example 10) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with polyglyceryl monolaurate (SY Glister ML-750, manufactured by Sakamoto Pharmaceutical Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0072] (Comparative Example 11) In Comparative Example 3, the preparation was carried out in the same manner except that polyoxyethylene behenyl ether was replaced with PEG-10 dimethicone (KF-6043, manufactured by Shin-Etsu Chemical Co., Ltd.), but a homogeneous aqueous dispersion could not be obtained.

[0073] <Evaluation Method: Appearance (Distribution State)> The dispersion state of the aqueous dispersions obtained in Examples 1-11 and Comparative Examples 1-11 was visually observed immediately after production and after storage at 45°C for one month. A ◎ indicated uniform dispersion, a ○ indicated uniform dispersion with some foaming or clumping, a △ indicated good water absorption but significant foaming or clumping, and a × indicated separation of most of the powder from the water. The results are shown in Table 1.

[0074] <Evaluation method: Water repellency> The aqueous dispersions obtained in Examples 1-11 were applied to artificial leather using an applicator (gap 500 μm) and dried at 40°C for 30 minutes to obtain a coating film. 5 μl of water was dropped onto this coating film, and the contact angle was measured using an automatic contact angle meter DM-501 manufactured by Kyowa Interface Science Co., Ltd. The results are shown in Table 1.

[0075] [Table 1]

[0076] The results shown in Table 1 clearly demonstrate that the aqueous dispersion of the present invention exhibits good dispersion and is suitable for use in cosmetics. Furthermore, when two types of component (B) were used, the dispersion remained better after one month of storage, even in aqueous dispersions with a higher concentration of the inorganic powder surface-hydrophobized with component (A), compared to when only one type was used. In addition, the aqueous dispersion of the present invention exhibited excellent water resistance, with a contact angle of 75-85° in water repellency tests.

[0077] (Example 12: Oil-in-water type sunscreen cream) (component) 1. Polyacrylic acid-based emulsifier (Note 1) 1.5 (%) 2,1,3-Butylene glycol 3.0 3. Preservative 0.1 4.Purified water 62.4 5. Ethylhexyl Methoxycinnamate 7.5 6. Dextrin palmitate 0.5 7. Decamethylcyclopentasiloxane 5.0 8. Cross-linked dimethylpolysiloxane 5.0 9. Aqueous dispersion of Example 1 10.0 10. Aqueous dispersion of Example 5 5.0 (Note 1): Polyacrylic acid-based emulsifier; Simalgel EG (manufactured by SEPPIC) (Manufacturing method) A: Mix ingredients 1-4 until uniform. B: Mix ingredients 5 and 6, then heat until uniform. C: Mix ingredients 7 and 8 until uniform. D: Add B and C to A and emulsify. Ingredients 9 and 10 were added to E:D to obtain an oil-in-water type sunscreen cream. The oil-in-water sunscreen cream obtained as described above spreads easily, provides a refreshing and moisturizing feel, has good makeup retention, and exhibits excellent stability without changing over time.

[0078] (Example 13: Oil-in-water type sunscreen cream) (component) 1. Polyacrylic acid-based emulsifier (Note 1) 1.5 (%) 2,1,3-Butylene glycol 5.0 3. Preservative 0.1 4.Purified water 56.9 5. Ethylhexyl Methoxycinnamate 9.0 6. Dextrin palmitate 0.5 7. Decamethylcyclopentasiloxane 7.0 8. Cross-linked dimethylpolysiloxane 5.0 9. Aqueous dispersion of Example 6 10.0 10. Aqueous dispersion of Example 7 5.0 (Note 1): Polyacrylic acid-based emulsifier; Simalgel EG (manufactured by SEPPIC) (Manufacturing method) A: Mix ingredients 1-4 until uniform. B: Mix ingredients 5 and 6, then heat until uniform. C: Mix ingredients 7 and 8 until uniform. D: Add B and C to A and emulsify. Ingredients 9 and 10 were added to E:D to obtain an oil-in-water type sunscreen cream. The oil-in-water sunscreen cream obtained as described above spreads easily, provides a refreshing and moisturizing feel, has good makeup retention, and exhibits excellent stability without changing over time.

[0079] (Example 14: Water-in-oil sunscreen cream) (component) 1. Ethylhexyl Methoxycinnamate 5.0 (%) 2. Diethylaminohydroxybenzoyl hexyl benzoate 1.0 3. Isotridecyl isononanoate 6.0 4. Decamethylcyclopentasiloxane 7.0 5. Alkyl polyether-modified silicone (Note 1) 1.5 6. Aqueous dispersion of Example 3 5.0 7.1,3-Butylene glycol 5.0 8. Ethanol 8.0 9. Sodium citrate 0.2 10. Magnesium sulfate 0.5 11.Purified water 60.8 (Note 1) Alkyl polyether copromodified silicone; KF-6038 (manufactured by Shin-Etsu Chemical Co., Ltd.) (Manufacturing method) A: Mix ingredients 1-5 until uniform. B: Mix and dissolve ingredients 6-11 until uniform. C:B was added to A and emulsified to obtain a water-in-oil screen cream. The water-in-oil screen cream obtained as described above spreads easily, provides a refreshing and moisturizing feel, has excellent staying power, and exhibits superior stability with no changes over time.

[0080] (Example 15: Oil-in-water emulsion foundation) (component) 1. Decamethylcyclopentasiloxane 20.0 (%) 2. Ethylhexyl Methoxycinnamate 3.0 3. Dimethylpolysiloxane (10cs) 5.0 4. Silicone-treated titanium oxide 8.0 5. Silicone-treated red iron oxide 0.4 6. Silicone-treated yellow iron oxide 1.0 7. Silicone-treated black iron oxide 0.1 8. Stearoxyhydroxypropylmethylcellulose (Note 1) 0.3 9. Preservative 0.1 10.Purified water 49.1 11.1,3-Butylene glycol 3.0 12. Aqueous dispersion of Example 2 10.0 (Note 1) Stearoxyhydroxypropylmethylcellulose; Sanjelose 90L (manufactured by Daido Chemical Industries, Ltd.) (Manufacturing method) A: Mix ingredients 8-11 and heat to dissolve. B: Mix components 1-3, add components 4-7 to this mixture, and disperse and mix with a disperser. C: Add B to A and emulsify, then add component 12 to obtain an oil-in-water foundation. The oil-in-water foundation obtained in this manner exhibited excellent usability, including smooth application, non-stickiness, and long-lasting wear, as well as good storage stability.

[0081] (Example 16: Water-in-oil emulsion foundation) (component) 1. Decamethylcyclopentasiloxane 16.6% 2. Isotridecyl isononanoate 4.0 3. Ethylhexyl Methoxycinnamate 4.0 4. Polyether-modified silicone (Note 1) 2.0 5. Cross-linked dimethylpolysiloxane 1.0 6. Silicone-treated titanium oxide 8.0 7. Silicone-treated red iron oxide 0.4 8. Silicone-treated yellow iron oxide 1.0 9. Silicone-treated black iron oxide 0.1 10. POE sorbitan monooleate (20EO) 0.3 11.1,3-Butylene glycol 4.0 12. Dispersion of Example 10 5.0 13. Glycerin 4.0 14. Magnesium sulfate 1.0 15. Ethanol 5.0 16. Preservative 0.1 17.Purified water 43.5 (Note 1) Polyether-modified silicone; ES-5612 (manufactured by Toray Dow Corning Co., Ltd.) (Manufacturing method) A: Mix ingredients 1-5 until uniform. B: Add 6-9 to ingredients 10 and 11 and disperse using a roller. Mix C:B and ingredients 12-17 until uniform. D:C was added to A and emulsified to obtain a water-in-oil foundation. The water-in-oil foundation obtained in this manner exhibited excellent usability, including smooth application, non-stickiness, and long-lasting wear, as well as good storage stability. [Industrial applicability]

[0082] The aqueous dispersion of the present invention exhibits excellent dispersion, providing a refreshing and invigorating feel, and offers good dispersibility and long-lasting wear, thus possessing great industrial potential.

Claims

1. A surface-hydrophobized inorganic powder aqueous dispersion containing the following components (A), (B), (C), and (D) as essential components. (A) Surface hydrophobic treated inorganic powder (B) Sebacoylbislauramidylsin disodium or / and coconut oil alkyl glucoside hydroxypropyl phosphate sodium (C) Polyhydric alcohol (D) Water

2. The surface-hydrophobized inorganic powder aqueous dispersion according to claim 1, wherein component (A) is an inorganic powder that has been surface-hydrophobized with at least one compound selected from the group consisting of silicone oil, alkoxysilane, and fatty acid.

3. A cosmetic composition comprising an aqueous dispersion of surface-hydrophobized inorganic powder as described in claim 1 or claim 2.

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