Oil-in-water emulsion composition

Abstract

Provided is an oil-in-water emulsion composition containing (A) a silica-coated titanium oxide powder treated with dimethicone, and (B) a cationic substance.

Description

Oil-in-water emulsion composition

[0001] The present invention relates to an oil-in-water emulsion composition.

[0002] In recent years, there has been a trend in several countries toward the use of safer materials in cosmetics. For example, Patent Document 1 discloses an oil-in-water emulsion cosmetic that contains t-butyl methoxydibenzoylmethane, an ultraviolet absorber that has a safe and UVA protective effect, and titanium powder, an ultraviolet scattering agent.

[0003] Japanese Patent Application Laid-Open No. 2022-125258

[0004] However, in Patent Document 1, the titanium powder is not silica-coated, which may result in the elution of metal ions from the core metal, causing a red discoloration. It is also conceivable to incorporate t-butyl methoxydibenzoylmethane into an oil-in-water emulsion composition together with dimethicone-surface-treated silica-coated titanium oxide powder that has been hydrophobized with dimethicone, which is safe. However, in this case, the viscosity of the oil-in-water emulsion composition increases in a high-temperature environment, which may result in poor usability.

[0005] An object of one embodiment of the present invention is to provide an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and has excellent usability.

[0006] In order to solve the above problems, a first aspect of the present invention provides an oil-in-water emulsion composition containing: (A) silica-coated titanium oxide powder treated with dimethicone; and (B) a cationic substance.

[0007] In order to solve the above-mentioned problems, a second aspect of the present invention provides an oil-in-water emulsion composition containing: (A) silica-coated titanium oxide powder treated with dimethicone; and (C) zinc oxide powder.

[0008] According to a first aspect of the present invention, an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and has excellent usability can be provided. Also, according to a second aspect of the present invention, an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and has excellent usability can be provided.

[0009] The oil-in-water emulsion composition of the first embodiment of the present invention will be described in detail below.

[0010] (Oil-in-water emulsion composition of the first embodiment) The oil-in-water emulsion composition of the first embodiment of the present invention is an oil-in-water emulsion composition containing (A) silica-coated titanium oxide powder treated with dimethicone, and (B) a cationic substance. According to this embodiment, it is possible to provide an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and has excellent usability. The oil-in-water emulsion composition of the first embodiment of the present invention may further contain components other than those described above.

[0011] <(A) Silica-coated titanium oxide powder treated with dimethicone> The oil-in-water emulsion composition of the first embodiment of the present invention contains silica-coated titanium oxide powder treated with dimethicone as component (A). The silica-coated titanium oxide powder treated with dimethicone is a titanium oxide powder having a silica coating on the surface thereof, which has been hydrophobized with dimethicone, and acts as an ultraviolet scattering agent in the oil-in-water emulsion composition of the present invention.

[0012] In the silica-coated titanium oxide powder that is treated with dimethicone, silica coating preferably exists on the entire surface of titanium powder in one layer or more, more preferably in two layers or more.By having silica coating in the silica-coated titanium oxide powder that is treated with dimethicone, the surface of titanium powder is covered with silica, so that the catalytic activity of metal can be suppressed, and when used in combination with ultraviolet absorber, the stability is good, discoloration can be suppressed, and the feeling of use can be improved.In addition, when silica coating exists in two layers or more, the effect can be further enhanced.

[0013] The silica-coated titanium oxide powder treated with dimethicone is stable in oil and contributes to the emulsion stability of the oil-in-water emulsion composition of the present invention.

[0014] The content of the silica-coated titanium dioxide powder (A) treated with dimethicone in the first embodiment of the present invention is not particularly limited, but is preferably 1% by mass or more and 10% by mass or less, more preferably 2% by mass or more and 7% by mass or less, and even more preferably 3% by mass or more and 5% by mass or less. If it is 1% by mass or more, the effect as an ultraviolet scattering agent can be sufficiently ensured, and if it is 10% by mass or less, it is easy to maintain emulsion stability.

[0015] The particle shape of the silica-coated titanium oxide powder treated with dimethicone in the first embodiment of the present invention is not particularly limited, and examples thereof include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, massive, etc. The particle size is also not particularly limited, and the average primary particle size may be 2 nm to 5 μm, 2 nm to 1 μm, or 2 nm to 500 nm.

[0016] Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniformly dispersed state, so the silica-coated titanium oxide powder treated with dimethicone preferably has an average primary particle size of 2 nm to 500 nm, more preferably 20 nm to 500 nm, and even more preferably 20 nm to 250 nm. In this specification, "average primary particle size" means the diameter of the circle equivalent to the projected area of ​​the primary particles in a transmission electron microscope (TEM) image.

[0017] <(B) Cationic Substance> The oil-in-water emulsion composition of the first embodiment of the present invention contains a cationic substance as component (B). The cationic substance acts as a dispersant and suppresses an increase in viscosity of the oil-in-water emulsion composition in a high-temperature environment. The cationic substance may be one or more of cationic silicones and alkyl quaternary ammonium salts. Examples of cationic silicones include amino-modified silicones. Examples of alkyl quaternary ammonium salts include monoalkyl quaternary ammonium salts and dialkyl quaternary ammonium salts. In particular, the oil-in-water emulsion composition of the above embodiment preferably contains, as the cationic substance, at least one selected from the group consisting of amino-modified silicones and distearyldimonium chloride.

[0018] As described above, the cationic substance may be a substance that functions as a cationic surfactant. Examples of cationic surfactants other than one or more of the above-mentioned cationic silicones and alkyl quaternary ammonium salts include alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.); alkylpyridinium salts (e.g., cetylpyridinium chloride, etc.); distearyldimethylammonium chloride dialkyldimethylammonium salts; poly(N,N'-dimethyl-3,5-methylenepiperidinium) chloride; alkyldimethylbenzylammonium salts; alkylisoquinolinium salts; dialkylmorphonium salts; POE-alkylamines; alkylamine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; benzethonium chloride, etc. One or more of these cationic surfactants may be used in combination with at least one selected from the group consisting of cationic silicones and alkyl quaternary ammonium salts.

[0019] The content of the cationic substance in the oil-in-water emulsion composition of the first embodiment of the present invention is preferably 0.1% by mass to 0.5% by mass, more preferably 0.13% by mass to 0.4% by mass, and even more preferably 0.15% by mass to 0.3% by mass. When the content of the cationic substance in the oil-in-water emulsion composition of the first embodiment is 0.1% by mass or more, the dispersibility of the UV scattering agent is improved, and when it is 0.5% by mass or less, emulsion stability is easily maintained.

[0020] In the oil-in-water emulsion composition of the first embodiment of the present invention, the mass ratio [(B) / (A)] of the cationic substance (B) to the silica-coated titanium oxide powder (A) treated with dimethicone is preferably 0.01 to 0.4, and more preferably 0.05 to 0.3. When the mass ratio [(B) / (A)] of component (B) to component (A) is 0.01 or more, the silica-coated titanium oxide powder treated with dimethicone is easily dispersed sufficiently, and when it is 0.4 or less, stickiness is less likely to occur, resulting in a good feel when applied.

[0021] <<Amino-Modified Silicone>> In the oil-in-water emulsion composition of the first embodiment of the present invention, the amino-modified silicone is used as a powder dispersant and acts as a dispersant for the silica-coated titanium oxide powder treated with dimethicone. The amino-modified silicone contained in the oil-in-water emulsion composition of the first embodiment of the present invention preferably includes at least one selected from the group consisting of amodimethicone, aminoethylaminopropyl dimethicone, and aminopropyl dimethicone.

[0022] Commercially available amodimethicone products include, for example, Silicone KF8004 (manufactured by Shin-Etsu Chemical Co., Ltd.), Silicone KF867S (manufactured by Shin-Etsu Chemical Co., Ltd.), BELSIL (registered trademark) ADM 1650 (manufactured by Wacker Asahi Kasei Silicones Co., Ltd.), BELSIL (registered trademark) ADM 6057 E (manufactured by Wacker Asahi Kasei Silicones Co., Ltd.), SF1708 fluid (manufactured by Momentive), and XF42-B1989 (manufactured by Momentive).

[0023] Commercially available aminoethylaminopropyl dimethicone products include, for example, Silicone KF8005S (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0024] Commercially available aminopropyl dimethicone products include, for example, KF-8015 (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0025] The amino-modified silicone contained in the oil-in-water emulsion composition of the first aspect of the present invention preferably contains a side-chain amino-modified silicone represented by the following general formula (1) having a functional group equivalent of 1 to 20,000, and in the following general formula (1), X is preferably an alkyl group having 1 to 18 carbon atoms, and R and R' are preferably alkyl groups (alkylene groups) having 1 to 6 carbon atoms. m and n are positive numbers, preferably numbers of 1 or more, and more preferably integers of 1 or more.

[0026]

[0027] The functional group equivalent of the amino-modified silicone represented by the general formula (1) is preferably 1 to 20,000, and more preferably 1,000 to 15,000. When the functional group equivalent of the amino-modified silicone represented by the general formula (1) is 1 to 20,000, the silica-coated titanium oxide powder treated with dimethicone is easily dispersed sufficiently in the oil-in-water emulsion composition.

[0028] <<Distearyldimonium Chloride>> Distearyldimonium chloride is used as a dispersant for powders, and acts as a dispersant for the silica-coated titanium oxide powder treated with dimethicone.

[0029] Commercially available distearyldimonium chloride products include, for example, Cation 2ABT (manufactured by NOF Corporation), NIKKOL CA-3475V (manufactured by Nikko Chemicals Co., Ltd.), and VARISOFT TA 100 (manufactured by Evonik).

[0030] <Ultraviolet Absorber> The oil-in-water emulsion composition of the first aspect of the present invention preferably further contains an ultraviolet absorber. Examples of the ultraviolet absorber include t-butyl methoxydibenzoylmethane, ethylhexyl triazine, bisethylhexyloxyphenol methoxyphenyl triazine, benzoic acid-based ultraviolet absorbers (e.g., diethylaminohydroxybenzoylhexyl benzoate, 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, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based ultraviolet absorbers (e.g., ethylhexyl salicylate, amyl salicylate, menthyl salicylate, homomenthyl salicylate, o-methyl salicylate, ... octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.); cinnamic acid-based ultraviolet absorbers (e.g., 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-methoxycinnamate, isopropyl -p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-para-methoxycinnamate, etc.);Benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.); 3-(4'- Examples of suitable benzotriazoles include 2-(2-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, drometrizole trisiloxane, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, octocrylene, phenylbenzimidazole sulfonic acid, and terephthalylidene dicamphor sulfonic acid.

[0031] The content of the ultraviolet absorber in the oil-in-water emulsion composition of the first aspect of the present invention is preferably 1% by mass to 30% by mass, more preferably 5% by mass to 20% by mass, and even more preferably 10% by mass to 15% by mass.

[0032] As the ultraviolet absorber contained in the oil-in-water emulsion composition of the first embodiment of the present invention, t-butyl methoxydibenzoylmethane is preferred from the viewpoint of high UVA protection effect. The content of t-butyl methoxydibenzoylmethane contained in the oil-in-water emulsion composition of the first embodiment of the present invention is preferably 0.1% by mass to 2% by mass, more preferably 0.3% by mass to 1.5% by mass, and even more preferably 0.5% by mass to 1% by mass. When the content of t-butyl methoxydibenzoylmethane contained in the oil-in-water emulsion composition of the first embodiment is 0.1% by mass or more, the ultraviolet absorption effect can be ensured, and when it is 2% by mass or less, stickiness is unlikely to occur and the feel when applied is good.

[0033] Commercially available t-butyl methoxydibenzoylmethane products include CHEM 1789 (manufactured by Toa Kasei Co., Ltd.), Eusolex (registered trademark) 9020 (manufactured by Merck), and Parsol (registered trademark) 1789 (manufactured by DSM K.K.).

[0034] <Other Components> The oil-in-water emulsion composition of the first embodiment of the present invention may contain other components in addition to those described above, such as thickeners, emulsifiers, dispersants such as powder dispersants other than component (B), oils, moisturizers, powder components, liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, silicones, surfactants other than cationic surfactants, such as anionic surfactants, amphoteric surfactants, nonionic surfactants, active agents other than surfactants, water-soluble polymers, sequestering agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, polymer emulsions, neutralizing agents, pH adjusters, vitamins, antioxidants, antioxidant aids, stabilizers, transdermal absorption inhibitors, fragrances, water, etc., which may be appropriately blended as needed, and the composition may be produced by a conventional method depending on the desired dosage form. Specific components that can be blended into the oil-in-water emulsion composition of the first embodiment of the present invention are listed below.

[0035] Examples of thickeners include gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed (marmelo), casein, dextrin, gelatin, sodium pectinate, sodium alginate, methylcellulose, ethylcellulose, CMC, hydroxyethylcellulose, hydroxypropylcellulose, PVA, PVM, PVP, sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, xanthan gum, aluminum magnesium silicate, bentonite, hexahydroxybenzoate, hydroxypropyl cellulose ... Examples of suitable surfactants include tritrite, magnesium silicate A1 (Veegum), laponite, silicic anhydride, dimethylacrylamide / sodium acryloyldimethyltaurate copolymer, cellulose gum, succinoglycan, stearoxyhydroxypropyl methylcellulose, carbomer, acrylates / C10-30 alkyl acrylate crosspolymer, stearoxyhydroxypropyl methylcellulose, succinoglycan, gellan gum, ammonium acryloyldimethyltaurate / VP copolymer, and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer. Note that acrylates / C10-30 alkyl acrylate crosspolymer and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer also function as surfactants and emulsifiers.

[0036] Examples of emulsifiers include PEG-60 hydrogenated castor oil, PEG-100 hydrogenated castor oil, beheneth-20, beheneth-10, beheneth-30, and PPG-8 ceteth-20.

[0037] Examples of dispersants, particularly powder dispersants other than component (B), include isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, polyhydroxystearic acid, etc. These powder dispersants can be used alone or in combination of two or more. Furthermore, when such powder dispersants other than component (B) are used, the mass ratio of the powder dispersant other than component (B) to component (B) is preferably 1:0.05 to 1:0.3, more preferably 1:0.1 to 1:0.25.

[0038] Examples of oils include diisopropyl sebacate, alkyl benzoate (C12-15), dextrin palmitate, dimethicone (1.5 cst), diphenylsiloxyphenyl trimethicone, cetyl ethylhexanoate, isopropyl myristate, isopropyl palmitate, octyl palmitate, 2-ethylhexyl palmitate, glycol distearate, myristyl myristate, isononyl isononanoate, tri(caprylic acid / capric acid)glyceryl, isododecane, isohexadecane, undecane, tridecane, liquid paraffin, squalane, hydrogenated didecene, hydrogenated polydecene, dimethicone (6 cst), dimethicone (20 cst), dimethicone (50 cst), and the like.

[0039] Examples of moisturizing agents include glycerin, dynamite glycerin, dipropylene glycol, 1,3-butylene glycol, cholesteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, urea, diglycerin ethylene oxide-propylene oxide adduct, and in particular, when an acidic mucopolysaccharide such as chondroitin sulfate or hyaluronic acid is added, the whitening effect of the alkoxysalicylic acid and / or its salt is enhanced.

[0040] Examples of the powder component include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, lepidolite, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soap (e.g., zinc myristate), , calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (for example, polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); inorganic white pigments (for example, titanium dioxide, zinc oxide, etc.); inorganic red pigments (for example, iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (for example, γ-iron oxide, etc.); inorganic yellow pigments (for example, yellow iron oxide, yellow ochre, etc.); inorganic Black pigments (e.g., black iron oxide, low-order titanium oxide, etc.); inorganic purple pigments (e.g., mango violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); pearl pigments (e.g., titanium dioxide-coated mica, titanium dioxide-coated bismuth oxychloride, titanium dioxide-coated talc, colored titanium dioxide-coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); zirconium, barium organic pigments such as sodium or aluminum lakes (e.g., organic pigments such as Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1); natural pigments (e.g., chlorophyll, β-carotene, etc.).

[0041] As the powder component, the "zinc oxide powder" explained as component (C) in the second embodiment may be used.

[0042] Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0043] Examples of solid fats and oils include cacao butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef trotter fat, Japan wax, and hardened castor oil.

[0044] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivory wax, whale wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0045] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0046] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0047] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.); branched-chain alcohols (e.g., monostearyl glycerin ether (batyl alcohol), 2-decyltetradecynol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and the like.

[0048] Examples of synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, Glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptyl palmitate lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0049] Examples of silicone oils include chain polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins that form a three-dimensional network structure, silicone rubber, and various modified polysiloxanes (e.g., amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc.).

[0050] Examples of silicones include alkyl and alkoxy silicone waxes such as stearyl-modified dimethicone and behenyl-modified dimethicone, silicone resins that form a three-dimensional network structure, and silicone rubber.

[0051] Examples of anionic surfactants include fatty acid soaps (e.g., sodium laurate, sodium palmitate, etc.); higher alkyl sulfates (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfates (e.g., POE-lauryl triethanolamine sulfate, POE-lauryl sodium sulfate, etc.); N-acyl sarcosinates (e.g., sodium lauroyl sarcosinate, etc.); higher fatty acid amide sulfonates (e.g., sodium N-myristoyl-N-methyl taurate, sodium coconut oil fatty acid methyl tauride, sodium lauryl methyl tauride, etc.); phosphate salts (sodium POE-oleyl ether phosphate, POE-stearyl ether phosphate, etc.); sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol ... sodium succinate, etc.); alkylbenzenesulfonates (for example, sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfate salts (for example, sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (for example, monosodium N-lauroylglutamate, disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (for example, turmeric oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylate salts; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfate salts; higher fatty acid alkylolamide sulfate salts; sodium lauroylmonoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; and sodium caseinate.

[0052] Examples of amphoteric surfactants include imidazoline-based amphoteric surfactants (e.g., 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine, etc.).

[0053] Examples of nonionic surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants.

[0054] Examples of lipophilic nonionic surfactants include sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, etc.); glycerin polyglycerin fatty acids (e.g., glycerin monocottonseed oil fatty acid, glycerin monoerucate, glycerin sesquioleate, glycerin monostearate, glycerin α,α'-oleic acid pyroglutamate, glycerin monostearate malate, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; and glycerin alkyl ethers.

[0055] Examples of hydrophilic nonionic surfactants include POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE sorbit fatty acid esters (e.g., POE-sorbitan monolaurate, POE-sorbitan monooleate, POE-sorbitan pentaoleate, POE-sorbit monostearate, etc.); POE-glycerin fatty acid esters (e.g., POE-glycerin monostearate, POE-monooleates such as POE-glycerin monoisostearate, POE-glycerin triisostearate, etc.); POE-fatty acid esters (for example, POE-distearate, POE-monodioleate, ethylene glycol distearate, etc.); POE-alkyl ethers (for example, POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE-cholestanol ether, etc.); Pluronic® types (for example, Pluronic POE·POP-alkyl ethers (for example, POE·POP-cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP-monobutyl ether, POE·POP-hydrogenated lanolin, POE·POP-glycerin ether, etc.); tetraPOE·tetraPOP-ethylenediamine condensates (for example, Tetronic, etc.); POE-castor oil hydrogenated castor oil derivatives (for example, POE-castor oil, POE-hydrogenated castor oil, POE-hydrogenated castor oil monoisostearate, POE-hydrogenated castor oil triisostearate, etc.); POE-hydrogenated castor oil monopyroglutamic acid monoisostearate diester, POE-hydrogenated castor oil maleic acid, etc.); POE-beeswax / lanolin derivatives (for example, POE-sorbitol beeswax, etc.); alkanolamides (for example, coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, etc.); POE-propylene glycol fatty acid esters; POE-alkylamines; POE-fatty acid amides; sucrose fatty acid esters; alkylethoxydimethylamine oxide; trioleyl phosphate, etc.

[0056] Examples of active agents other than surfactants include active agents that emulsify by fine particles, specifically active agents for Pickering emulsification. Examples of active agents for Pickering emulsification include (acrylamide / DMAPA acrylate / methoxy PEG methacrylate) copolymer, hydrophobic silica, etc. Since (acrylamide / DMAPA acrylate / methoxy PEG methacrylate) copolymer is water-resistant, it can be suitably used when water resistance is required for the oil-in-water emulsion composition.

[0057] Examples of water-soluble polymers include natural water-soluble polymers, semi-synthetic water-soluble polymers, and synthetic water-soluble polymers.

[0058] Examples of natural water-soluble polymers include plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (marmelo), algae colloid (cassowia extract), starch (rice, corn, potato, wheat), glycyrrhizic acid); microbial-derived polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.); and animal-derived polymers (e.g., collagen, casein, albumin, gelatin, etc.).

[0059] Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methyl cellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, etc.); and alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

[0060] Examples of synthetic water-soluble polymers include vinyl polymers (e.g., polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyoxyethylene polypropylene copolymers of polyethylene glycol 20,000, 40,000, 60,000, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; cationic polymers, etc.

[0061] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, disodium edetate, trisodium edetate, tetrasodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, and trisodium ethylenediaminehydroxyethyltriacetate.

[0062] Examples of the lower alcohol include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0063] Examples of polyhydric alcohols include dihydric alcohols (e.g., ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, etc.); trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.); tetrahydric alcohols (e.g., pentaerythritol such as 1,2,6-hexanetriol, etc.); pentahydric alcohols (e.g., xylitol, etc.); hexahydric alcohols (e.g., sorbitol, mannitol, etc.); polyhydric alcohol polymers (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, etc.); dihydric alcohol alkyl ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, etc.);Dihydric alcohol alkyl ethers (e.g., diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether, etc.); dihydric alcohol ether esters (e.g., ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diadipate, ethylene glycol disuccinate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monophenyl ether acetate, etc.); glycerin monoalkyl ethers (e.g., xyl alcohol, selachyl alcohol, batyl alcohol, etc.); sugar alcohols (e.g., sorbitol, maltitol, maltodextrin, etc.); Examples of such sugars include erythritol, mannitol, sucrose, erythritol, glucose, fructose, starch-decomposed sugars, maltose, xylitose, starch-decomposed sugar-reduced alcohols, etc.; glysolid; tetrahydrofurfuryl alcohol; POE-tetrahydrofurfuryl alcohol; POP-butyl ether; POP·POE-butyl ether; tripolyoxypropylene glycerin ether; POP-glycerin ether; POP-glycerin ether phosphate; POP·POE-pentaneerythritol ether, polyglycerin, etc.;

[0064] Examples of sugars include monosaccharides, oligosaccharides, and polysaccharides.

[0065] Examples of monosaccharides include trioses (e.g., D-glyceryl aldehyde, dihydroxyacetone, etc.); tetraoses (e.g., D-erythrose, D-erythrulose, D-threose, erythritol, etc.); pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.); hexoses (e.g., D-glucose, D-talose, D-busicose, D-galactose, D-fructose, L-galactose, L- heptoses (e.g., aldoheptose, heptose, etc.); octose (e.g., octulose, etc.); deoxysugars (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.); aminosugars (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid, etc.); uronic acids (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.), etc.

[0066] Examples of oligosaccharides include sucrose, gunthianose, umbelliferose, lactose, planteose, isolychnoses, α,α-trehalose, raffinose, lychnoses, umbilicin, stachyose, verbascoses, and the like.

[0067] Examples of polysaccharides include cellulose, quince seed, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, tragacanth gum, keratan sulfate, chondroitin, xanthan gum, mucoitin sulfate, guar gum, dextran, keratosulfate, locust bean gum, succinoglucan, and caronic acid.

[0068] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.) and basic amino acids (e.g., hydroxylysine, etc.). Examples of amino acid derivatives include sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

[0069] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0070] Examples of polymer emulsions include acrylic resin emulsion, polyethyl acrylate emulsion, acrylic resin liquid, polyacrylic alkyl ester emulsion, polyvinyl acetate resin emulsion, and natural rubber latex.

[0071] Examples of the neutralizing agent include inorganic bases such as sodium hydroxide and potassium hydroxide; and organic amines such as monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0072] Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid, sodium citrate, citric acid-sodium citrate, and succinic acid-sodium succinate.

[0073] Examples of vitamins include vitamins A, B1, B2, B6, C, E and derivatives thereof, pantothenic acid and derivatives thereof, biotin, etc.

[0074] Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0075] Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0076] Examples of the stabilizer include sodium pyrosulfite and EDTA-2Na.

[0077] Other ingredients that can be added include, for example, preservatives (phenoxyethanol, ethylparaben, butylparaben, chlorphenesin, etc.); anti-inflammatory agents (for example, glycyrrhizinic acid derivatives, glycyrrhetinic acid derivatives, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); whitening agents (for example, placenta extract, saxifrage extract, arbutin, vitamin C, magnesium ascorbyl phosphate, ascorbic acid glucoside, arbutin, alkoxysalicylic acid and its salts, etc.); various extracts (for example, Phellodendron bark, Coptis chinensis, Lithospermum root, Peony root, Swertia japonica, Birch, sage, Loquat, Carrot, Aloe vera, Mallow, Iris, Grape, Job's tears, Loofah, Lily, Saffron, Cnidium rhizome, Angelica juncea , St. John's wort, Ononis, garlic, chili pepper, tangerine peel, angelica tree, seaweed, etc.), activators (for example, royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (for example, nonylic acid valenylamide, nicotinic acid benzyl ester, nicotinic acid β-butoxyethyl ester, capsaicin, zingerone, cantharides tincture, ichthammol, tannic acid, α-borneol, tocopherol nicotinate, inositol hexanicotinate, cyclandelate, cinnarizine, tolazoline, acetylcholine, verapamil, cepharanthine, γ-oryzanol, etc.); antiseborrheic agents (for example, sulfur, thianthol, etc.); anti-inflammatory agents (for example, tranexamic acid, thiotaurine, hypotaurine, etc.), etc.

[0078] (Production of the oil-in-water emulsion composition of the first embodiment) The oil-in-water emulsion composition of the first embodiment can be produced by a method for preparing a conventional cosmetic product. For example, the oil-in-water emulsion composition of the first embodiment of the present invention can be produced by preparing an aqueous phase component and an oil phase component, respectively, and then gradually adding the oil phase component to the aqueous phase, and emulsifying the mixture using an emulsifier or the like as needed.

[0079] The oil-in-water emulsion composition according to the first aspect of the present invention can be suitably used in various dosage forms such as cream, emulsion, liquid, etc. The product form can be skin care cosmetics such as sunscreen, or makeup cosmetics such as makeup base and foundation.

[0080] Next, the oil-in-water emulsion composition of the second embodiment of the present invention will be described in detail.

[0081] (Second embodiment of oil-in-water emulsion composition) The second embodiment of the oil-in-water emulsion composition of the present invention is an oil-in-water emulsion composition containing: (A) silica-coated titanium oxide powder treated with dimethicone; and (C) zinc oxide powder.

[0082] According to the oil-in-water emulsion composition of the second aspect of the present invention, it is possible to provide an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and has excellent usability.

[0083] <(A) Silica-coated titanium oxide powder treated with dimethicone> The oil-in-water emulsion composition of the second embodiment of the present invention contains silica-coated titanium oxide powder treated with dimethicone as component (A). The silica-coated titanium oxide powder treated with dimethicone is a titanium oxide powder core having a silica coating on the surface thereof, which has been hydrophobized with dimethicone, and acts as an ultraviolet scattering agent in the oil-in-water emulsion composition of the present invention.

[0084] In the silica-coated titanium oxide powder that is treated with dimethicone, silica coating preferably exists on the entire surface of titanium powder in one layer or more, more preferably in two layers or more.By having silica coating in the silica-coated titanium oxide powder that is treated with dimethicone, the surface of titanium powder is covered with silica, so that the catalytic activity of metal can be suppressed, and when used in combination with ultraviolet absorber, the stability is good, discoloration can be suppressed, and the feeling of use can be improved.In addition, when silica coating exists in two layers or more, the effect can be further enhanced.

[0085] The silica-coated titanium oxide powder treated with dimethicone is stable in oil and contributes to the emulsion stability of the oil-in-water emulsion composition of the present invention.

[0086] The content of the silica-coated titanium dioxide powder (A) treated with dimethicone in the second embodiment of the present invention is not particularly limited, but is preferably 1% by mass or more and 10% by mass or less, more preferably 2% by mass or more and 7% by mass or less, and even more preferably 3% by mass or more and 5% by mass or less. If it is 1% by mass or more, the effect as an ultraviolet scattering agent can be sufficiently ensured, and if it is 10% by mass or less, it is easy to maintain emulsion stability.

[0087] The particle shape of the silica-coated titanium oxide powder treated with dimethicone in the second embodiment of the present invention is not particularly limited, and examples thereof include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, massive, etc. The particle size is also not particularly limited, and the average primary particle size may be 2 nm to 5 μm, 2 nm to 1 μm, or 2 nm to 500 nm.

[0088] Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniformly dispersed state, so the silica-coated titanium oxide powder treated with dimethicone preferably has an average primary particle size of 2 nm to 500 nm, more preferably 20 nm to 500 nm, and even more preferably 20 nm to 250 nm. In this specification, "average primary particle size" means the diameter of the circle equivalent to the projected area of ​​the primary particles in a transmission electron microscope (TEM) image.

[0089] <(C) Zinc oxide powder> The oil-in-water emulsion composition of the second embodiment of the present invention contains zinc oxide powder as component (C). The zinc oxide powder acts as an ultraviolet scattering agent in the oil-in-water emulsion composition of the second embodiment of the present invention. Furthermore, the zinc oxide powder suppresses an increase in viscosity of the oil-in-water emulsion composition in a high-temperature environment.

[0090] The zinc oxide powder of component (C) may or may not be hydrophobized. Examples of hydrophobization treatments for zinc oxide powder include dimethicone treatment and triethoxycaprylylsilane treatment.

[0091] The particle shape of the zinc oxide powder of component (C) is not particularly limited, and examples thereof include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, massive, etc. The particle size is also not particularly limited, and the average primary particle size may be 2 nm to 5 μm, 2 nm to 1 μm, or 2 nm to 500 nm.

[0092] Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniformly dispersed state. Therefore, the zinc oxide powder preferably has an average primary particle size of 2 nm to 500 nm, more preferably 20 nm to 500 nm, and even more preferably 20 nm to 250 nm.

[0093] The content of zinc oxide powder in the oil-in-water emulsion composition of the second embodiment of the present invention is preferably 1% by mass to 10% by mass, more preferably 1.5% by mass to 8% by mass, and even more preferably 2% by mass to 6% by mass. When the content of zinc oxide powder in the oil-in-water emulsion composition of the second embodiment is 1% by mass or more, an ultraviolet protection effect can be exerted, and when it is 10% by mass or less, the composition is less likely to feel powdery when applied.

[0094] <Ultraviolet Absorber> The oil-in-water emulsion composition of the second aspect of the present invention preferably further contains an ultraviolet absorber, and examples of the ultraviolet absorber include t-butyl methoxydibenzoylmethane, ethylhexyl triazine, bisethylhexyloxyphenol methoxyphenyl triazine, benzoic acid-based ultraviolet absorbers (e.g., diethylaminohydroxybenzoylhexyl benzoate, 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, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based ultraviolet absorbers (e.g., ethylhexyl salicylate, amyl salicylate, menthyl salicylate, homomenthyl salicylate, o-methyl salicylate, ... octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.); cinnamic acid-based ultraviolet absorbers (e.g., 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-methoxycinnamate, isopropyl -p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-para-methoxycinnamate, etc.);Benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.); 3-(4'- Examples of suitable benzotriazoles include 2-(2-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, drometrizole trisiloxane, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, octocrylene, phenylbenzimidazole sulfonic acid, and terephthalylidene dicamphor sulfonic acid.

[0095] The content of the ultraviolet absorber in the oil-in-water emulsion composition of the second aspect of the present invention is preferably 1% by mass to 30% by mass, more preferably 5% by mass to 20% by mass, and even more preferably 10% by mass to 15% by mass.

[0096] As the ultraviolet absorber contained in the oil-in-water emulsion composition of the second embodiment of the present invention, t-butyl methoxydibenzoylmethane is preferred from the viewpoint of high UVA protection effect. The content of t-butyl methoxydibenzoylmethane contained in the oil-in-water emulsion composition of the second embodiment of the present invention is preferably 0.1% by mass to 2% by mass, more preferably 0.3% by mass to 1.5% by mass, and even more preferably 0.5% by mass to 1% by mass. When the content of t-butyl methoxydibenzoylmethane contained in the oil-in-water emulsion composition of the second embodiment is 0.1% by mass or more, the ultraviolet absorption effect can be ensured, and when it is 2% by mass or less, stickiness is unlikely to occur and the feel when applied is good.

[0097] Commercially available t-butyl methoxydibenzoylmethane products include CHEM 1789 (manufactured by Toa Kasei Co., Ltd.), Eusolex (registered trademark) 9020 (manufactured by Merck), and Parsol (registered trademark) 1789 (manufactured by DSM K.K.).

[0098] <Other Components> The oil-in-water emulsion composition of the second embodiment of the present invention may contain other components in addition to those described above, such as thickeners, emulsifiers, dispersants such as powder dispersants, oils, moisturizers, powder components, liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, silicones, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, active agents other than surfactants, water-soluble polymers, sequestering agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, polymer emulsions, neutralizing agents, pH adjusters, vitamins, antioxidants, antioxidant aids, stabilizers, transdermal absorption inhibitors, fragrances, water, etc., which may be appropriately blended as needed, and the composition may be produced by a conventional method depending on the desired dosage form. Specific components that can be blended into the oil-in-water emulsion composition of the second embodiment of the present invention are listed below.

[0099] Examples of thickeners include gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed (marmelo), casein, dextrin, gelatin, sodium pectinate, sodium alginate, methylcellulose, ethylcellulose, CMC, hydroxyethylcellulose, hydroxypropylcellulose, PVA, PVM, PVP, sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, xanthan gum, aluminum magnesium silicate, bentonite, hexahydroxybenzoate, hydroxypropyl cellulose ... Examples of suitable surfactants include tritrite, magnesium silicate A1 (Veegum), laponite, silicic anhydride, dimethylacrylamide / sodium acryloyldimethyltaurate copolymer, cellulose gum, succinoglycan, stearoxyhydroxypropyl methylcellulose, carbomer, acrylates / C10-30 alkyl acrylate crosspolymer, stearoxyhydroxypropyl methylcellulose, succinoglycan, gellan gum, ammonium acryloyldimethyltaurate / VP copolymer, and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer. Note that acrylates / C10-30 alkyl acrylate crosspolymer and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer also function as surfactants and emulsifiers.

[0100] Examples of emulsifiers include PEG-60 hydrogenated castor oil, PEG-100 hydrogenated castor oil, beheneth-20, beheneth-10, beheneth-30, and PPG-8 ceteth-20.

[0101] Examples of dispersants, particularly powder dispersants, include isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, polyhydroxystearic acid, etc. Furthermore, the "cationic substance" described as component (B) in the first embodiment may also be used as the powder dispersant.

[0102] Examples of oils include diisopropyl sebacate, alkyl benzoate (C12-15), dextrin palmitate, dimethicone (1.5 cst), diphenylsiloxyphenyl trimethicone, cetyl ethylhexanoate, isopropyl myristate, isopropyl palmitate, octyl palmitate, 2-ethylhexyl palmitate, glycol distearate, myristyl myristate, isononyl isononanoate, tri(caprylic acid / capric acid)glyceryl, isododecane, isohexadecane, undecane, tridecane, liquid paraffin, squalane, hydrogenated didecene, hydrogenated polydecene, dimethicone (6 cst), dimethicone (20 cst), dimethicone (50 cst), and the like.

[0103] Examples of moisturizing agents include glycerin, dynamite glycerin, dipropylene glycol, 1,3-butylene glycol, cholesteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, urea, diglycerin ethylene oxide-propylene oxide adduct, and in particular, when an acidic mucopolysaccharide such as chondroitin sulfate or hyaluronic acid is added, the whitening effect of the alkoxysalicylic acid and / or its salt is enhanced.

[0104] Examples of the powder component include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, lepidolite, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soap (e.g., zinc myristate), , calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (for example, polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); inorganic white pigments (for example, titanium dioxide, zinc oxide, etc.); inorganic red pigments (for example, iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (for example, γ-iron oxide, etc.); inorganic yellow pigments (for example, yellow iron oxide, yellow ochre, etc.); inorganic Black pigments (e.g., black iron oxide, low-order titanium oxide, etc.); inorganic purple pigments (e.g., mango violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); pearl pigments (e.g., titanium dioxide-coated mica, titanium dioxide-coated bismuth oxychloride, titanium dioxide-coated talc, colored titanium dioxide-coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); zirconium, barium organic pigments such as sodium or aluminum lakes (e.g., organic pigments such as Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1); natural pigments (e.g., chlorophyll, β-carotene, etc.).

[0105] Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0106] Examples of solid fats and oils include cacao butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef trotter fat, Japan wax, and hardened castor oil.

[0107] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivory wax, whale wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0108] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0109] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0110] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.); branched-chain alcohols (e.g., monostearyl glycerin ether (batyl alcohol), 2-decyltetradecynol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and the like.

[0111] Examples of synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, Glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptyl palmitate lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0112] Examples of silicone oils include chain polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins that form a three-dimensional network structure, silicone rubber, and various modified polysiloxanes (e.g., amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc.).

[0113] Examples of silicones include alkyl and alkoxy silicone waxes such as stearyl-modified dimethicone and behenyl-modified dimethicone, silicone resins that form a three-dimensional network structure, and silicone rubber.

[0114] Examples of anionic surfactants include fatty acid soaps (e.g., sodium laurate, sodium palmitate, etc.); higher alkyl sulfates (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfates (e.g., POE-lauryl triethanolamine sulfate, POE-lauryl sodium sulfate, etc.); N-acyl sarcosinates (e.g., sodium lauroyl sarcosinate, etc.); higher fatty acid amide sulfonates (e.g., sodium N-myristoyl-N-methyl taurate, sodium coconut oil fatty acid methyl tauride, sodium lauryl methyl tauride, etc.); phosphate salts (sodium POE-oleyl ether phosphate, POE-stearyl ether phosphate, etc.); sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol ... sodium succinate, etc.); alkylbenzenesulfonates (for example, sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfate salts (for example, sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (for example, monosodium N-lauroylglutamate, disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (for example, turmeric oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylate salts; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfate salts; higher fatty acid alkylolamide sulfate salts; sodium lauroylmonoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; and sodium caseinate.

[0115] Examples of cationic surfactants include alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.); alkylpyridinium salts (e.g., cetylpyridinium chloride, etc.); distearyldimethylammonium chloride dialkyldimethylammonium salts; poly(N,N'-dimethyl-3,5-methylenepiperidinium) chloride; alkyl quaternary ammonium salts; alkyldimethylbenzylammonium salts; alkylisoquinolinium salts; dialkylmorphonium salts; POE-alkylamines; alkylamine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; and benzethonium chloride.

[0116] Examples of amphoteric surfactants include imidazoline-based amphoteric surfactants (e.g., 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine, etc.).

[0117] Examples of nonionic surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants.

[0118] Examples of lipophilic nonionic surfactants include sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, etc.); glycerin polyglycerin fatty acids (e.g., glycerin monocottonseed oil fatty acid, glycerin monoerucate, glycerin sesquioleate, glycerin monostearate, glycerin α,α'-oleic acid pyroglutamate, glycerin monostearate malate, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives; and glycerin alkyl ethers.

[0119] Examples of hydrophilic nonionic surfactants include POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE sorbit fatty acid esters (e.g., POE-sorbitan monolaurate, POE-sorbitan monooleate, POE-sorbitan pentaoleate, POE-sorbit monostearate, etc.); POE-glycerin fatty acid esters (e.g., POE-glycerin monostearate, POE-monooleates such as POE-glycerin monoisostearate, POE-glycerin triisostearate, etc.); POE-fatty acid esters (for example, POE-distearate, POE-monodioleate, ethylene glycol distearate, etc.); POE-alkyl ethers (for example, POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE-cholestanol ether, etc.); Pluronic® types (for example, Pluronic POE·POP-alkyl ethers (for example, POE·POP-cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP-monobutyl ether, POE·POP-hydrogenated lanolin, POE·POP-glycerin ether, etc.); tetraPOE·tetraPOP-ethylenediamine condensates (for example, Tetronic, etc.); POE-castor oil hydrogenated castor oil derivatives (for example, POE-castor oil, POE-hydrogenated castor oil, POE-hydrogenated castor oil monoisostearate, POE-hydrogenated castor oil triisostearate, etc.); POE-hydrogenated castor oil monopyroglutamic acid monoisostearate diester, POE-hydrogenated castor oil maleic acid, etc.); POE-beeswax / lanolin derivatives (for example, POE-sorbitol beeswax, etc.); alkanolamides (for example, coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, etc.); POE-propylene glycol fatty acid esters; POE-alkylamines; POE-fatty acid amides; sucrose fatty acid esters; alkylethoxydimethylamine oxide; trioleyl phosphate, etc.

[0120] Examples of active agents other than surfactants include active agents that emulsify by fine particles, specifically active agents for Pickering emulsification. Examples of active agents for Pickering emulsification include (acrylamide / DMAPA acrylate / methoxy PEG methacrylate) copolymer, hydrophobic silica, etc. Since (acrylamide / DMAPA acrylate / methoxy PEG methacrylate) copolymer is water-resistant, it can be suitably used when water resistance is required for the oil-in-water emulsion composition.

[0121] Examples of water-soluble polymers include natural water-soluble polymers, semi-synthetic water-soluble polymers, and synthetic water-soluble polymers.

[0122] Examples of natural water-soluble polymers include plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (marmelo), algae colloid (cassowia extract), starch (rice, corn, potato, wheat), glycyrrhizic acid); microbial-derived polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.); and animal-derived polymers (e.g., collagen, casein, albumin, gelatin, etc.).

[0123] Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methyl cellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, etc.); and alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

[0124] Examples of synthetic water-soluble polymers include vinyl polymers (e.g., polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyoxyethylene polypropylene copolymers of polyethylene glycol 20,000, 40,000, 60,000, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; cationic polymers, etc.

[0125] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, disodium edetate, trisodium edetate, tetrasodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, and trisodium ethylenediaminehydroxyethyltriacetate.

[0126] Examples of the lower alcohol include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0127] Examples of polyhydric alcohols include dihydric alcohols (e.g., ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, etc.); trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.); tetrahydric alcohols (e.g., pentaerythritol such as 1,2,6-hexanetriol, etc.); pentahydric alcohols (e.g., xylitol, etc.); hexahydric alcohols (e.g., sorbitol, mannitol, etc.); polyhydric alcohol polymers (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, etc.); dihydric alcohol alkyl ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, etc.);Dihydric alcohol alkyl ethers (e.g., diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether, etc.); dihydric alcohol ether esters (e.g., ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diadipate, ethylene glycol disuccinate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monophenyl ether acetate, etc.); glycerin monoalkyl ethers (e.g., xyl alcohol, selachyl alcohol, batyl alcohol, etc.); sugar alcohols (e.g., sorbitol, maltitol, maltodextrin, etc.); Examples of such sugars include erythritol, mannitol, sucrose, erythritol, glucose, fructose, starch-decomposed sugars, maltose, xylitose, starch-decomposed sugar-reduced alcohols, etc.; glysolid; tetrahydrofurfuryl alcohol; POE-tetrahydrofurfuryl alcohol; POP-butyl ether; POP·POE-butyl ether; tripolyoxypropylene glycerin ether; POP-glycerin ether; POP-glycerin ether phosphate; POP·POE-pentaneerythritol ether, polyglycerin, etc.;

[0128] Examples of sugars include monosaccharides, oligosaccharides, and polysaccharides.

[0129] Examples of monosaccharides include trioses (e.g., D-glyceryl aldehyde, dihydroxyacetone, etc.); tetraoses (e.g., D-erythrose, D-erythrulose, D-threose, erythritol, etc.); pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.); hexoses (e.g., D-glucose, D-talose, D-busicose, D-galactose, D-fructose, L-galactose, L- heptoses (e.g., aldoheptose, heptose, etc.); octose (e.g., octulose, etc.); deoxysugars (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.); aminosugars (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid, etc.); uronic acids (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.), etc.

[0130] Examples of oligosaccharides include sucrose, gunthianose, umbelliferose, lactose, planteose, isolychnoses, α,α-trehalose, raffinose, lychnoses, umbilicin, stachyose, verbascoses, and the like.

[0131] Examples of polysaccharides include cellulose, quince seed, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, tragacanth gum, keratan sulfate, chondroitin, xanthan gum, mucoitin sulfate, guar gum, dextran, keratosulfate, locust bean gum, succinoglucan, and caronic acid.

[0132] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.) and basic amino acids (e.g., hydroxylysine, etc.). Examples of amino acid derivatives include sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

[0133] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0134] Examples of polymer emulsions include acrylic resin emulsion, polyethyl acrylate emulsion, acrylic resin liquid, polyacrylic alkyl ester emulsion, polyvinyl acetate resin emulsion, and natural rubber latex.

[0135] Examples of the neutralizing agent include inorganic bases such as sodium hydroxide and potassium hydroxide; and organic amines such as monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0136] Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid, sodium citrate, citric acid-sodium citrate, succinic acid-sodium succinate, magnesium chloride, calcium chloride, and potassium hydroxide.

[0137] Examples of vitamins include vitamins A, B1, B2, B6, C, E and derivatives thereof, pantothenic acid and derivatives thereof, biotin, etc.

[0138] Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0139] Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0140] Examples of the stabilizer include sodium pyrosulfite and EDTA-2Na.

[0141] Other ingredients that can be added include, for example, preservatives (phenoxyethanol, ethylparaben, butylparaben, chlorphenesin, etc.); anti-inflammatory agents (for example, glycyrrhizinic acid derivatives, glycyrrhetinic acid derivatives, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); whitening agents (for example, placenta extract, saxifrage extract, arbutin, vitamin C, magnesium ascorbyl phosphate, ascorbic acid glucoside, arbutin, alkoxysalicylic acid and its salts, etc.); various extracts (for example, Phellodendron bark, Coptis chinensis, Lithospermum root, Peony root, Swertia japonica, Birch, sage, Loquat, Carrot, Aloe vera, Mallow, Iris, Grape, Job's tears, Loofah, Lily, Saffron, Cnidium rhizome, Angelica juncea , St. John's wort, Ononis, garlic, chili pepper, tangerine peel, angelica tree, seaweed, etc.), activators (for example, royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (for example, nonylic acid valenylamide, nicotinic acid benzyl ester, nicotinic acid β-butoxyethyl ester, capsaicin, zingerone, cantharides tincture, ichthammol, tannic acid, α-borneol, tocopherol nicotinate, inositol hexanicotinate, cyclandelate, cinnarizine, tolazoline, acetylcholine, verapamil, cepharanthine, γ-oryzanol, etc.); antiseborrheic agents (for example, sulfur, thianthol, etc.); anti-inflammatory agents (for example, tranexamic acid, thiotaurine, hypotaurine, etc.), etc.

[0142] (Production of the oil-in-water emulsion composition of the second form) The oil-in-water emulsion composition of the second form can be produced based on a method for preparing ordinary cosmetics. For example, the oil-in-water emulsion composition of the second form of the present invention can be produced by preparing the aqueous phase component and the oil phase component, respectively, and then gradually adding the oil phase component to the aqueous phase, and emulsifying the mixture using an emulsifier or the like as needed.

[0143] The oil-in-water emulsion composition according to the second aspect of the present invention can be suitably used in various formulations such as cream, emulsion, liquid, etc. The product form can be skin care cosmetics such as sunscreen, or makeup cosmetics such as makeup base and foundation.

[0144] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, all contents are expressed in mass % relative to the total amount.

[0145] (Regarding the oil-in-water emulsion composition of the first form) After preparing the aqueous phase component and the oil phase component according to the formulations in Table 1, the oil phase component was gradually added to the aqueous phase and emulsified using an emulsifier or the like as necessary, to prepare the oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8. The high-temperature thickening property and usability of each oil-in-water emulsion composition were evaluated by the following methods. Examples 1 to 4 had the configuration of the oil-in-water emulsion composition of the first form, and were uniformly emulsified after preparation without any floating oil or the like.

[0146] <High-Temperature Viscosity> -Initial Viscosity- The initial viscosity of the oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8 was measured using a Brookfield viscometer with a rotor number 4 at a rotation speed of 12 rpm and a temperature of 30°C.

[0147] - Viscosity after high-temperature treatment - The oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8 were allowed to stand in a thermostatic bath at 70°C for 3 days, and then the viscosity of the oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8 after high-temperature treatment was measured using a Brookfield viscometer with a rotor number 4 at a rotation speed of 12 rpm and a temperature of 30°C.

[0148] The oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8 were evaluated for high-temperature thickening properties based on the following criteria, with the viscosity after high-temperature treatment being calculated by subtracting the initial viscosity from the viscosity after high-temperature treatment. The results are shown in Table 1.

[0149] [Evaluation criteria] A: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is 5,000 mPa·s or less. B: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is more than 5,000 mPa·s and 10,000 mPa·s or less. C: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is more than 10,000 mPa·s.

[0150] <Usability> The oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8 were left to stand in a thermostatic bath at 70°C for 3 days, and then directly applied to the face. The usability was comprehensively evaluated by a panel of three experts based on the following evaluation criteria. The results are shown in Table 1.

[0151] [Evaluation criteria] A: No sticky feeling B: Slightly sticky feeling C: Sticky feeling

[0152] An oil-in-water emulsion composition that is evaluated as "A" or "B" for high-temperature thickening property and "A" or "B" for usability is determined to be applicable as the oil-in-water emulsion composition of the first embodiment of the present invention.

[0153]

[0154] Examples 1 to 4 contained dimethicone-treated silica-coated titanium powder as component (A) and amodimethicone or distearyldimonium chloride, which is a cationic substance as component (B), and had a high-temperature thickening property of "A" or "B" and usability of "A" or "B."

[0155] Comparative Examples 1 to 8 did not contain amodimethicone or distearyldimonium chloride, which are the cationic substances of component (B), and therefore had poor dispersibility, high-temperature thickening was rated "C," and usability was rated "C."

[0156] From the above, it has been demonstrated that an oil-in-water emulsion composition satisfying the first aspect of the present invention provides an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and is excellent in usability. Furthermore, it has also been demonstrated that an oil-in-water emulsion composition satisfying the first aspect of the present invention can provide an oil-in-water emulsion composition that has a low environmental impact.

[0157] (Regarding the oil-in-water emulsion composition of the second form) After preparing the aqueous phase components and oil phase components according to the formulations in Table 2, the oil phase components were gradually added to the aqueous phase and emulsified using an emulsifier or the like as necessary, to prepare the oil-in-water emulsion compositions of Examples 5 to 8 and Comparative Examples 9 to 12. The high-temperature thickening property and usability of each oil-in-water emulsion composition were evaluated by the following methods. Examples 5 to 8 had the configuration of the oil-in-water emulsion composition of the second form, and were uniformly emulsified after preparation without any floating oil or the like.

[0158] <High-Temperature Viscosity> -Initial Viscosity- The initial viscosity of the oil-in-water emulsion compositions of Examples 5 to 8 and Comparative Examples 9 to 12 was measured using a Brookfield viscometer with a rotor number 4 at a rotation speed of 12 rpm and a temperature of 30°C.

[0159] —Viscosity after high-temperature treatment— The oil-in-water emulsion compositions of Examples 5 to 8 and Comparative Examples 9 to 12 were allowed to stand in a thermostatic bath at 70°C for 3 days, and then the viscosity of the oil-in-water emulsion compositions of Examples 5 to 8 and Comparative Examples 9 to 12 after high-temperature treatment was measured using a Brookfield viscometer with a rotor number 4 at a rotation speed of 12 rpm and a temperature of 30°C.

[0160] The oil-in-water emulsion compositions of Examples 5 to 8 and Comparative Examples 9 to 12 were evaluated for high-temperature thickening properties based on the following criteria, with the viscosity after high-temperature treatment being calculated by subtracting the initial viscosity from the viscosity after high-temperature treatment. The results are shown in Table 2.

[0161] [Evaluation criteria] A: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is 5,000 mPa·s or less. B: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is more than 5,000 mPa·s and 10,000 mPa·s or less. C: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is more than 10,000 mPa·s.

[0162] <Usability> The oil-in-water emulsion compositions of Examples 5 to 8 and Comparative Examples 9 to 12 were left to stand in a thermostatic bath at 70°C for 3 days, and then directly applied to the face. The usability was comprehensively evaluated by a panel of three experts based on the following evaluation criteria. The results are shown in Table 2.

[0163] [Evaluation criteria] A: No sticky feeling B: Slightly sticky feeling C: Sticky feeling

[0164] An oil-in-water emulsion composition that is evaluated as "A" or "B" for high-temperature thickening property and "A" or "B" for usability is determined to be applicable as an oil-in-water emulsion composition of the second embodiment of the present invention.

[0165]

[0166] Examples 5 to 8 contained dimethicone-treated silica-coated titanium powder as component (A) and zinc oxide powder as component (C), and had a high-temperature thickening property of "A" or "B" and usability of "A" or "B."

[0167] In Comparative Examples 9 to 12, the high-temperature thickening property was rated as "C" because the zinc oxide powder of component (C) was not contained. In Comparative Examples 11 and 12, the usability was rated as "C".

[0168] From the above, it has been demonstrated that an oil-in-water emulsion composition satisfying the second aspect of the present invention provides an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and is excellent in usability. Furthermore, it has also been demonstrated that an oil-in-water emulsion composition satisfying the second aspect of the present invention can provide an oil-in-water emulsion composition that has a low environmental impact.

[0169] The present invention includes, for example, the following aspects.

[0170] <1> An oil-in-water emulsion composition containing (A) silica-coated titanium oxide powder treated with dimethicone and (B) a cationic substance.

[0171] <2> The oil-in-water emulsion composition according to the above <1>, wherein the (B) cationic substance comprises at least one selected from the group consisting of amino-modified silicones and distearyldimonium chloride.

[0172] <3> The oil-in-water emulsion composition according to the above <2>, wherein the amino-modified silicone contains at least one selected from the group consisting of amodimethicone, aminoethylaminopropyl dimethicone, and aminopropyl dimethicone.

[0173] <4> The oil-in-water emulsion composition according to the above item <1>, <2>, or <3>, wherein the mass ratio [(B) / (A)] of the cationic substance (B) to the silica-coated titanium oxide powder (A) treated with dimethicone is 0.01 to 0.4.

[0174] <5> The oil-in-water emulsion composition according to the above <1>, <2>, <3>, or <4>, further comprising t-butyl methoxydibenzoylmethane.

[0175] <6> An oil-in-water emulsion composition containing (A) silica-coated titanium oxide powder treated with dimethicone and (C) zinc oxide powder.

[0176] <7> The oil-in-water emulsion composition according to the above <6>, wherein the zinc oxide powder (C) has not been subjected to a hydrophobic treatment.

[0177] <8> The oil-in-water emulsion composition according to the above <6>, wherein the zinc oxide powder (C) has been subjected to a hydrophobic treatment.

[0178] <9> The oil-in-water emulsion composition according to the above <8>, wherein the hydrophobic treatment is a dimethicone treatment or a triethoxycaprylylsilane treatment.

[0179] <10> The oil-in-water emulsion composition according to the above <6>, <7>, <8>, or <9>, wherein the average primary particle size of the zinc oxide powder (C) is 20 nm to 500 nm.

[0180] <11> The oil-in-water emulsion composition according to the above <6>, <7>, <8>, <9>, or <10>, further comprising t-butyl methoxydibenzoylmethane.

[0181] According to any one of the oil-in-water emulsion compositions <1> to <11> above, the conventional problems can be solved and the object of the present invention can be achieved.

[0182] This application claims priority based on Japanese Patent Application No. 2024-101570, filed on June 24, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. An oil-in-water emulsion composition comprising: (A) silica-coated titanium oxide powder treated with dimethicone; and (B) a cationic substance.

2. The oil-in-water emulsion composition according to claim 1, wherein the cationic substance (B) comprises at least one selected from the group consisting of amino-modified silicones and distearyldimonium chloride.

3. The oil-in-water emulsion composition according to claim 2, wherein the amino-modified silicone comprises at least one selected from the group consisting of amodimethicone, aminoethylaminopropyl dimethicone, and aminopropyl dimethicone.

4. The oil-in-water emulsion composition according to claim 1 or 2, wherein the mass ratio [(B) / (A)] of the cationic substance (B) to the silica-coated titanium oxide powder (A) treated with dimethicone is 0.01 to 0.

4.

5. The oil-in-water emulsion composition according to claim 1 or 2, further comprising t-butyl methoxydibenzoylmethane.

6. An oil-in-water emulsion composition comprising: (A) silica-coated titanium oxide powder treated with dimethicone; and (C) zinc oxide powder.

7. The oil-in-water emulsion composition according to claim 6, wherein the zinc oxide powder (C) has not been subjected to a hydrophobic treatment.

8. The oil-in-water emulsion composition according to claim 6, wherein the zinc oxide powder (C) has been subjected to a hydrophobic treatment.

9. The oil-in-water emulsion composition according to claim 8, wherein the hydrophobic treatment is a dimethicone treatment or a triethoxycaprylylsilane treatment.

10. The oil-in-water emulsion composition according to any one of claims 6 to 9, wherein the zinc oxide powder (C) has an average primary particle size of 20 nm to 500 nm.

11. The oil-in-water emulsion composition according to any one of claims 6 to 9, further comprising t-butyl methoxydibenzoylmethane.

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