WO2026004590A1 - Oil-in-water emulsion composition - Google Patents

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

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

In recent years, there has been a trend in several countries toward using safer ingredients in cosmetics. For example, Patent Document 1 discloses an oil-in-water emulsion cosmetic that contains t-butyl methoxydibenzoylmethane, a UV absorber with UVA protection and no safety issues, and titanium powder, an UV scattering agent.

Japanese Patent Application Laid-Open No. 2022-125258

However, in Patent Document 1, the titanium powder is not silica-coated, which could result in metal ions leaching from the core metal and causing a red discoloration. It is also possible to incorporate t-butyl methoxydibenzoylmethane into the oil-in-water emulsion composition along 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 high-temperature environments, which could result in poor usability.

An object of one embodiment of the present invention is to provide an oil-in-water emulsion composition that is highly safe, inhibits thickening at high temperatures, and is easy to use.

In order to solve the above problem, a first aspect of the present invention is
(A) silica-coated titanium oxide powder treated with dimethicone;
(B) a cationic substance;
The present invention provides an oil-in-water emulsion composition comprising:

In order to solve the above problem, a second aspect of the present invention is
(A) silica-coated titanium oxide powder treated with dimethicone;
(C) zinc oxide powder;
The present invention provides an oil-in-water emulsion composition comprising:

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

The oil-in-water emulsion composition of the first embodiment of the present invention is described in detail below.

(Oil-in-water emulsion composition of the first embodiment)
The oil-in-water emulsion composition of the first aspect 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 aspect, it is possible to provide an oil-in-water emulsion composition that is highly safe, can suppress thickening at high temperatures, and is excellent in usability. The oil-in-water emulsion composition of the first aspect of the present invention may further contain components other than those described above.

<(A) Silica-coated titanium oxide powder treated with dimethicone>
The oil-in-water emulsion composition of the first embodiment of the present invention contains, as component (A), a silica-coated titanium oxide powder treated with dimethicone. 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.

In silica-coated titanium oxide powder treated with dimethicone, it is preferable that the silica coating be present in one or more layers over the entire surface of the titanium powder, and more preferably in two or more layers. When silica-coated titanium oxide powder treated with dimethicone has a silica coating, the surface of the titanium powder is covered with silica, which suppresses the catalytic activity of the metal, improves stability when used in combination with ultraviolet absorbers, inhibits discoloration, and improves the feel when used. Furthermore, if the silica coating is in two or more layers, the effect can be further enhanced.

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.

In the first embodiment of the present invention, the content of (A) silica-coated titanium oxide powder treated with dimethicone is not particularly limited, but is preferably, for example, 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, emulsion stability can be easily maintained.

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 include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, and block-like. 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.

Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniform dispersion 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" refers to the diameter of the circle equivalent to the projected area of the primary particles in a transmission electron microscope (TEM) image.

<(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 at least one cationic substance selected from the group consisting of amino-modified silicones and distearyldimonium chloride.

As mentioned 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 alkyl trimethyl ammonium salts (e.g., stearyl trimethyl ammonium chloride, lauryl trimethyl ammonium chloride, etc.); alkyl pyridinium salts (e.g., cetyl pyridinium chloride, etc.); distearyl dimethyl ammonium chloride dialkyl dimethyl ammonium salts; poly(N,N'-dimethyl-3,5-methylene piperidinium) chloride; alkyl dimethyl benzyl ammonium salts; alkyl isoquinolinium salts; dialkyl morphonium salts; POE-alkyl amines; alkyl amine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; benzethonium chloride; and the like. 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.

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.

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.

<<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 contains at least one selected from the group consisting of amodimethicone, aminoethylaminopropyl dimethicone, and aminopropyl dimethicone.

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).

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

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

Furthermore, the amino-modified silicone contained in the oil-in-water emulsion composition of the first embodiment 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. 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 greater, and more preferably integers of 1 or greater.

The functional group equivalent weight of the amino-modified silicone represented by the above general formula (1) is preferably 1 to 20,000, and more preferably 1,000 to 15,000. When the functional group equivalent weight of the amino-modified silicone represented by the above 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.

<<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.

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

<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., diethylaminohydroxybenzoyl hexyl 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., methyl-N-acetylanthranilate, etc.); For example, ethylhexyl salicylate, amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.); cinnamic acid-based ultraviolet absorbers (for example, 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 cinnamate, methyl-2,5-diisopropyl cinnamate, ethyl-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 cinnamate, methyl-2,5-diisopropyl cinnamate, methyl ...methyl-2,4-diisopropyl cin hexyl-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-hydroxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxybenzophenone-5-sulfonate, 2-hydroxybenzophenone-4-methyl-4-hydroxybenzophenone ... hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.); 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole;2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole;2-(2'-hydroxy-5'-methylphenylbenzotriazole, drometrizole trisiloxane; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, octocrylene, phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, and the like.

The content of the ultraviolet absorber contained in the oil-in-water emulsion composition of the first embodiment 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.

In terms of high UVA protection effect, t-butylmethoxydibenzoylmethane is preferred as the UV absorber contained in the oil-in-water emulsion composition of the first embodiment of the present invention. The content of t-butylmethoxydibenzoylmethane 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-butylmethoxydibenzoylmethane contained in the oil-in-water emulsion composition of the first embodiment is 0.1% by mass or more, UV absorption effect can be ensured, and when it is 2% by mass or less, stickiness is less likely to occur and the feel when applied is good.

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 Corporation).

<Other ingredients>
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 conventional methods according to 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.

Thickeners include, for example, gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed, casein, dextrin, gelatin, sodium pectinate, sodium allaginate, methylcellulose, ethylcellulose, CMC, hydroxyethylcellulose, hydroxypropylcellulose, PVA, PVM, PVP, sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, xanthan gum, magnesium aluminum silicate, bentonite, Examples include culletite, magnesium silicate A1 (Veegum), Laponite, silicic anhydride, dimethylacrylamide/sodium acryloyldimethyltaurate copolymer, cellulose gum, succinoglycan, stearoxyhydroxypropylmethylcellulose, carbomer, acrylates/C10-30 alkyl acrylate crosspolymer, stearoxyhydroxypropylmethylcellulose, succinoglycan, gellan gum, ammonium acryloyldimethyltaurate/VP copolymer, and ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer. Acrylates/C10-30 alkyl acrylate crosspolymer and ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer also function as surfactants and emulsifiers.

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.

Dispersants, particularly powder dispersants other than component (B), include, for example, 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, and more preferably 1:0.1 to 1:0.25.

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, caprylic/capric triglyceride, isododecane, isohexadecane, undecane, tridecane, liquid paraffin, squalane, hydrogenated didecene, hydrogenated polydecene, dimethicone (6 cst), dimethicone (20 cst), dimethicone (50 cst), etc.

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

Powder components include, for example, 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 soaps (e.g., sulfuric acid, magnesium myristate, magnesium carbonate, magnesium silicate, strontium silicate, tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (e.g., sulfuric acid, magnesium silicate, strontium silicate, magnesium silicate, tungstate, magnesium silicate, strontium silicate, tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (e.g., sulfuric acid, magnesium silicate, strontium silicate ... lead, calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, yellow ochre, etc.); inorganic 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 oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); zirconium, barium organic pigments such as sodium or aluminum lakes (for example, 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 (for example, chlorophyll, beta-carotene, etc.), etc.

In addition, the "zinc oxide powder" described as component (C) in the second embodiment may also be used as the powder component.

Examples of liquid oils 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.

Examples of solid fats and oils include cocoa butter, coconut oil, horse tallow, 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 foot fat, Japan wax, and hardened castor oil.

Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, privet wax, spermaceti, montan wax, 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, POE hydrogenated lanolin alcohol ether, etc.

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

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).

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-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and others.

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 ester, 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 Examples include lauroyl undecyl, diisobutyl adipate, N-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.

Examples of silicone oils include linear 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 (amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc.).

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.

Anionic surfactants include, for example, 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-triethanolamine lauryl sulfate, sodium POE-lauryl 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 sulfonate, etc.); sodium succinate, etc.); alkylbenzenesulfonates (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfates (e.g., sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (e.g., monosodium N-lauroylglutamate, disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (e.g., turmeric oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylates; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkylolamide sulfates; sodium lauroyl monoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; and sodium caseinate.

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.); and the like.

Examples of nonionic surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants.

Lipophilic nonionic surfactants include, for example, 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; glycerin alkyl ethers, etc.

Hydrophilic nonionic surfactants include, for example, POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE sorbitol fatty acid esters (e.g., POE-sorbitol monolaurate, POE-sorbitol monooleate, POE-sorbitol pentaoleate, POE-sorbitol monostearate, etc.); POE-glycerin fatty acid esters (e.g., POE-glycerin monostearate, POE-monooleates such as POE-glycerol monoisostearate, POE-glycerol 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 (e.g., POE-sorbitol beeswax, etc.); alkanolamides (e.g., 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.

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

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

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

Semi-synthetic water-soluble polymers include, for example, 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 alginate-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

Synthetic water-soluble polymers include, for example, vinyl polymers (e.g., polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyethylene glycol 20,000, 40,000, 60,000 polyoxyethylene polyoxypropylene copolymers, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; cationic polymers, etc.

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

Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

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, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetraglycerin, polyglycerin, etc.); glycerin, 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 diol 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, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch hydrolysis sugars, maltose, xylitose, starch hydrolysis 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.

Examples of sugars include monosaccharides, oligosaccharides, polysaccharides, etc.

Monosaccharides include, for example, trioses (e.g., D-glyceraldehyde, 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 -mannose, D-tagatose, etc.); heptoses (e.g., aldoheptose, heptose, etc.); octooses (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.

Examples of oligosaccharides include sucrose, gunthianose, umbelliferose, lactose, planteose, isolichinoses, α,α-trehalose, raffinose, lychinoses, umbilicin, stachyose, verbascoses, etc.

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.

Amino acids include, for example, neutral amino acids (e.g., threonine, cysteine, etc.); basic amino acids (e.g., hydroxylysine, etc.); and amino acid derivatives include, for example, sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

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

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.

Neutralizing agents 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.

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.

Examples of vitamins include vitamins A, B1, B2, B6, C, E and their derivatives, pantothenic acid and its derivatives, biotin, etc.

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

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.

Stabilizers include, for example, sodium pyrosulfite and EDTA-2Na.

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, Swertia japonica, Birch, sage, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Job's tears, Loofah, Lily, Saffron, Cnidium officinalis, Angelica juncea , St. John's wort, Ononis, garlic, chili pepper, tangerine peel, angelica tree, seaweed, etc.), activators (e.g., royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (e.g., 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 (e.g., sulfur, thianthol, etc.); anti-inflammatory agents (e.g., tranexamic acid, thiotaurine, hypotaurine, etc.), etc.

(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 ordinary cosmetics. 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, gradually adding the oil phase component to the aqueous phase, and emulsifying the composition using an emulsifier or the like as needed.

The oil-in-water emulsion composition according to the first aspect of the present invention can be suitably used in a variety of formulations, including creams, emulsions, and liquids. Product forms include skin care cosmetics such as sunscreens, and makeup cosmetics such as makeup bases and foundations.

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

(Second embodiment of oil-in-water emulsion composition)
The oil-in-water emulsion composition of the second aspect of the present invention comprises:
(A) silica-coated titanium oxide powder treated with dimethicone;
(C) zinc oxide powder;
The oil-in-water emulsion composition comprises:

The oil-in-water emulsion composition of the second aspect of the present invention can provide an oil-in-water emulsion composition that is highly safe, inhibits thickening at high temperatures, and is excellent in usability.

<(A) Silica-coated titanium oxide powder treated with dimethicone>
The oil-in-water emulsion composition of the second embodiment of the present invention contains, as component (A), a silica-coated titanium oxide powder treated with dimethicone. 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.

In silica-coated titanium oxide powder treated with dimethicone, it is preferable that the silica coating be present in one or more layers over the entire surface of the titanium powder, and more preferably in two or more layers. When silica-coated titanium oxide powder treated with dimethicone has a silica coating, the surface of the titanium powder is covered with silica, which suppresses the catalytic activity of the metal, improves stability when used in combination with ultraviolet absorbers, inhibits discoloration, and improves the feel when used. Furthermore, if the silica coating is in two or more layers, the effect can be further enhanced.

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.

In the second embodiment of the present invention, the content of (A) silica-coated titanium oxide powder treated with dimethicone is not particularly limited, but is preferably, for example, 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, emulsion stability can be easily maintained.

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 include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, and block-like. 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.

Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniform dispersion 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" refers to the diameter of the circle equivalent to the projected area of the primary particles in a transmission electron microscope (TEM) image.

<(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.

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

The particle shape of the zinc oxide powder (component (C)) is not particularly limited, and examples include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, and block-like shapes. 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.

Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniform dispersion state, so zinc oxide powder with an average primary particle size of 2 nm to 500 nm is preferred, 20 nm to 500 nm is more preferred, and 20 nm to 250 nm is even more preferred.

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, it can exert an ultraviolet protection effect, and when it is 10% by mass or less, it is less likely to feel powdery when applied.

<Ultraviolet absorber>
The oil-in-water emulsion composition of the second 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., diethylaminohydroxybenzoyl hexyl 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., methyl-N-acetylanthranilate, etc.); For example, ethylhexyl salicylate, amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.); cinnamic acid-based ultraviolet absorbers (for example, 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 cinnamate, methyl-2,5-diisopropyl cinnamate, ethyl-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 cinnamate, methyl-2,5-diisopropyl cinnamate, methyl ...methyl-2,4-diisopropyl cin hexyl-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-hydroxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxybenzophenone-5-sulfonate, 2-hydroxybenzophenone-4-methyl-4-hydroxybenzophenone ... hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.); 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole;2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole;2-(2'-hydroxy-5'-methylphenylbenzotriazole, drometrizole trisiloxane; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, octocrylene, phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, and the like.

The content of the ultraviolet absorber contained in the oil-in-water emulsion composition of the second embodiment 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.

In terms of high UVA protection effect, t-butylmethoxydibenzoylmethane is preferred as the UV absorber contained in the oil-in-water emulsion composition of the second embodiment of the present invention. The content of t-butylmethoxydibenzoylmethane 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-butylmethoxydibenzoylmethane contained in the oil-in-water emulsion composition of the second embodiment is 0.1% by mass or more, UV absorption effect can be ensured, and when it is 2% by mass or less, stickiness is less likely to occur and the feel when applied is good.

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 Corporation).

<Other ingredients>
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 conventional methods according to 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.

Thickeners include, for example, gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed, casein, dextrin, gelatin, sodium pectinate, sodium allaginate, methylcellulose, ethylcellulose, CMC, hydroxyethylcellulose, hydroxypropylcellulose, PVA, PVM, PVP, sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, xanthan gum, magnesium aluminum silicate, bentonite, Examples include culletite, magnesium silicate A1 (Veegum), Laponite, silicic anhydride, dimethylacrylamide/sodium acryloyldimethyltaurate copolymer, cellulose gum, succinoglycan, stearoxyhydroxypropylmethylcellulose, carbomer, acrylates/C10-30 alkyl acrylate crosspolymer, stearoxyhydroxypropylmethylcellulose, succinoglycan, gellan gum, ammonium acryloyldimethyltaurate/VP copolymer, and ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer. Acrylates/C10-30 alkyl acrylate crosspolymer and ammonium acryloyldimethyltaurate/beheneth-25 methacrylate crosspolymer also function as surfactants and emulsifiers.

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.

Dispersants, particularly powder dispersants, include, for example, isostearic acid, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, and polyhydroxystearic acid. Furthermore, the "cationic substance" described as component (B) in the first embodiment may also be used as a powder dispersant.

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, caprylic/capric triglyceride, isododecane, isohexadecane, undecane, tridecane, liquid paraffin, squalane, hydrogenated didecene, hydrogenated polydecene, dimethicone (6 cst), dimethicone (20 cst), dimethicone (50 cst), etc.

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

Powder components include, for example, 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 soaps (e.g., sulfuric acid, magnesium myristate, magnesium carbonate, magnesium silicate, strontium silicate, tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (e.g., sulfuric acid, magnesium silicate, strontium silicate, magnesium silicate, tungstate, magnesium silicate, strontium silicate, tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (e.g., sulfuric acid, magnesium silicate, strontium silicate ... lead, calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, yellow ochre, etc.); inorganic 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 oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); zirconium, barium organic pigments such as sodium or aluminum lakes (for example, 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 (for example, chlorophyll, beta-carotene, etc.), etc.

Examples of liquid oils 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.

Examples of solid fats and oils include cocoa butter, coconut oil, horse tallow, 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 foot fat, Japan wax, and hardened castor oil.

Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, privet wax, spermaceti, montan wax, 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, POE hydrogenated lanolin alcohol ether, etc.

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

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).

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-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and others.

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 ester, 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 Examples include lauroyl undecyl, diisobutyl adipate, N-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.

Examples of silicone oils include linear 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 (amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc.).

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.

Anionic surfactants include, for example, 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-triethanolamine lauryl sulfate, sodium POE-lauryl 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 sulfonate, etc.); sodium succinate, etc.); alkylbenzenesulfonates (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); higher fatty acid ester sulfates (e.g., sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); N-acylglutamates (e.g., monosodium N-lauroylglutamate, disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (e.g., turmeric oil, etc.); POE-alkyl ether carboxylic acids; POE-alkyl allyl ether carboxylates; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkylolamide sulfates; sodium lauroyl monoethanolamide succinate; ditriethanolamine N-palmitoyl aspartate; and sodium caseinate.

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; benzethonium chloride, etc.

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.); and the like.

Examples of nonionic surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants.

Lipophilic nonionic surfactants include, for example, 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; glycerin alkyl ethers, etc.

Hydrophilic nonionic surfactants include, for example, POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE sorbitol fatty acid esters (e.g., POE-sorbitol monolaurate, POE-sorbitol monooleate, POE-sorbitol pentaoleate, POE-sorbitol monostearate, etc.); POE-glycerin fatty acid esters (e.g., POE-glycerin monostearate, POE-monooleates such as POE-glycerol monoisostearate, POE-glycerol 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 (e.g., POE-sorbitol beeswax, etc.); alkanolamides (e.g., 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.

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

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

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

Semi-synthetic water-soluble polymers include, for example, 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 alginate-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

Synthetic water-soluble polymers include, for example, vinyl polymers (e.g., polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyethylene glycol 20,000, 40,000, 60,000 polyoxyethylene polyoxypropylene copolymers, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; cationic polymers, etc.

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

Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

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, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetraglycerin, polyglycerin, etc.); glycerin, 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 diol 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, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch hydrolysis sugars, maltose, xylitose, starch hydrolysis 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.

Examples of sugars include monosaccharides, oligosaccharides, polysaccharides, etc.

Monosaccharides include, for example, trioses (e.g., D-glyceraldehyde, 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 -mannose, D-tagatose, etc.); heptoses (e.g., aldoheptose, heptose, etc.); octooses (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.

Examples of oligosaccharides include sucrose, gunthianose, umbelliferose, lactose, planteose, isolichinoses, α,α-trehalose, raffinose, lychinoses, umbilicin, stachyose, verbascoses, etc.

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.

Amino acids include, for example, neutral amino acids (e.g., threonine, cysteine, etc.); basic amino acids (e.g., hydroxylysine, etc.); and amino acid derivatives include, for example, sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

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

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.

Neutralizing agents 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.

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.

Examples of vitamins include vitamins A, B1, B2, B6, C, E and their derivatives, pantothenic acid and its derivatives, biotin, etc.

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

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.

Stabilizers include, for example, sodium pyrosulfite and EDTA-2Na.

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, Swertia japonica, Birch, sage, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Job's tears, Loofah, Lily, Saffron, Cnidium officinalis, Angelica juncea , St. John's wort, Ononis, garlic, chili pepper, tangerine peel, angelica tree, seaweed, etc.), activators (e.g., royal jelly, photosensitizers, cholesterol derivatives, etc.); blood circulation promoters (e.g., 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 (e.g., sulfur, thianthol, etc.); anti-inflammatory agents (e.g., tranexamic acid, thiotaurine, hypotaurine, etc.), etc.

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

The oil-in-water emulsion composition according to the second aspect of the present invention can be suitably used in a variety of formulations, including creams, emulsions, and liquids. The product form can be skin care cosmetics such as sunscreens, or makeup cosmetics such as makeup bases and foundations.

The present invention will be explained in more detail below using examples, but the present invention is not limited to these. Unless otherwise specified, all contents are expressed as mass % of the total amount.

(Regarding the oil-in-water emulsion composition of the first embodiment)
After preparing the aqueous phase components and oil phase components according to the formulations in Table 1, 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 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 type, and after preparation, they were uniformly emulsified without any floating oil or the like.

<High temperature viscosity increase>
-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 rotor number 4 at a rotation speed of 12 rpm and a temperature of 30°C.

- 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 after high-temperature treatment 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.

The viscosity after high-temperature treatment of each of the oil-in-water emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 8 was calculated by subtracting the initial viscosity, and the high-temperature thickening properties were evaluated based on the following evaluation criteria. The results are shown in Table 1.

[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 less than 10,000 mPa·s. C: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is more than 10,000 mPa·s.

<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 of each composition was comprehensively evaluated by a panel of three experts based on the following evaluation criteria. The results are shown in Table 1.

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

Oil-in-water emulsion compositions that are rated "A" or "B" for high-temperature thickening and "A" or "B" for usability have been determined to be applicable as oil-in-water emulsion compositions of the first embodiment of the present invention.

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

Comparative Examples 1 to 8 did not contain the cationic substance (B) amodimethicone or distearyldimonium chloride, and therefore had poor dispersibility, high-temperature thickening was rated "C," and usability was rated "C."

From the above, it has been demonstrated that the oil-in-water emulsion composition satisfying the constitution of 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 has excellent usability.
Furthermore, it has been shown that an oil-in-water emulsion composition that satisfies the constitution of the first aspect of the present invention can provide an oil-in-water emulsion composition that places less strain on the natural environment.

(Regarding the oil-in-water emulsion composition of the second embodiment)
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 using the methods described below. Examples 5 to 8 had the configuration of the oil-in-water emulsion composition of the second type, and after preparation, they were uniformly emulsified without any floating oil or the like.

<High temperature viscosity increase>
-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 rotor number 4 at a rotation speed of 12 rpm and a temperature of 30°C.

- 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 after high-temperature treatment 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.

For the oil-in-water emulsion compositions of Examples 5-8 and Comparative Examples 9-12, the viscosity after high-temperature treatment was calculated by subtracting the initial viscosity, and the high-temperature thickening properties were evaluated based on the following evaluation criteria. The results are shown in Table 2.

[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 less than 10,000 mPa·s. C: The value obtained by subtracting the initial viscosity from the viscosity after high-temperature treatment is more than 10,000 mPa·s.

<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 of each composition was comprehensively evaluated by a panel of three experts based on the following evaluation criteria. The results are shown in Table 2.

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

Oil-in-water emulsion compositions that are rated "A" or "B" for high-temperature thickening and "A" or "B" for usability have been determined to be applicable as oil-in-water emulsion compositions of the second embodiment of the present invention.

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

Comparative Examples 9 to 12 did not contain zinc oxide powder (component (C)), and therefore received a "C" for high-temperature thickening. Furthermore, Comparative Examples 11 and 12 received a "C" for usability.

From the above, it has been demonstrated that the oil-in-water emulsion composition satisfying the constitution of 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 has excellent usability.
Furthermore, it was also shown that an oil-in-water emulsion composition that satisfies the constitution of the second aspect of the present invention can provide an oil-in-water emulsion composition that places less strain on the natural environment.

Aspects of the present invention include, for example, the following:

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

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

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

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

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

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

<8> The oil-in-water emulsion composition according to <6> above, wherein the zinc oxide powder (C) has been hydrophobized.

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

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

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

The oil-in-water emulsion composition described in any of items <1> to <11> above can solve the various problems encountered in the past and achieve the object of the present invention.

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

Claims (11)

(A) silica-coated titanium oxide powder treated with dimethicone;
(B) a cationic substance;
An oil-in-water emulsion composition comprising: The oil-in-water emulsion composition according to claim 1, wherein the (B) cationic substance comprises at least one selected from the group consisting of amino-modified silicone and distearyldimonium chloride. 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. 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. The oil-in-water emulsion composition according to claim 1 or 2, further comprising t-butyl methoxydibenzoylmethane. (A) silica-coated titanium oxide powder treated with dimethicone;
(C) zinc oxide powder;
An oil-in-water emulsion composition comprising: The oil-in-water emulsion composition according to claim 6, wherein the zinc oxide powder (C) has not been subjected to a hydrophobic treatment. The oil-in-water emulsion composition according to claim 6, wherein the zinc oxide powder (C) has been hydrophobized. The oil-in-water emulsion composition according to claim 8, wherein the hydrophobic treatment is a dimethicone treatment or a triethoxycaprylylsilane treatment. The oil-in-water emulsion composition according to any one of claims 6 to 9, wherein the average primary particle diameter of the zinc oxide powder (C) is 20 nm to 500 nm. The oil-in-water emulsion composition according to any one of claims 6 to 9, further comprising t-butyl methoxydibenzoylmethane.