Oil-in-water emulsion composition

Abstract

This oil-in-water emulsion composition contains a hydrophobized silica-coated titanium oxide powder, wherein the average particle diameter of the emulsified particles is 2-12.5 μm, the amount of oil phase component excluding powder in the oil-in-water emulsion composition is 20 mass% or more, and the amount of volatile oil component in the oil phase component excluding the powder is 15 mass% or less.

Description

Oil-in-water emulsion composition

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

[0002] Consumers are seeking cosmetics that combine a fresh feel with high UV protection effects. Oil-in-water emulsion cosmetics are widely used as base materials that provide a refreshing feel when used. For example, Patent Document 1 discloses an oil-in-water emulsion cosmetic that has a fresh feel when used and excellent UV protection ability due to the use of an UV scattering agent.

[0003] Patent No. 7150411

[0004] However, when a powder, particularly a powder such as a hydrophobized UV scattering agent, is blended into the oil phase, which is the internal phase of an oil-in-water emulsion cosmetic, the powder may escape from the internal phase, causing a significant change in the viscosity of the oil-in-water emulsion cosmetic at high temperatures and resulting in poor usability.

[0005] An object of one embodiment of the present invention is to provide an oil-in-water emulsion composition that has high viscosity stability at high temperatures and is easy to use.

[0006] In order to solve the above-mentioned problems, one embodiment of the present invention provides an oil-in-water emulsion composition containing hydrophobized silica-coated titanium oxide powder, wherein the average particle size of the emulsified particles is 2 μm to 12.5 μm, the amount of oil phase components excluding the powder in the oil-in-water emulsion composition is 20 mass% or more, and the amount of volatile oil in the oil phase components excluding the powder is 15 mass% or less.

[0007] According to one embodiment of the present invention, it is possible to provide an oil-in-water emulsion composition that has high viscosity stability at high temperatures and is excellent in usability.

[0008] The oil-in-water emulsion composition according to an embodiment of the present invention will be described in detail below.

[0009] (Oil-in-water emulsion composition) An oil-in-water emulsion composition according to one embodiment of the present invention is an oil-in-water emulsion composition containing hydrophobized silica-coated titanium oxide powder, wherein the average particle size of the emulsified particles is 2 μm to 12.5 μm, the amount of oil phase components excluding the powder in the oil-in-water emulsion composition is 20 mass% or more, and the amount of volatile oil in the oil phase components excluding the powder is 15 mass% or less. According to the present invention, it is possible to provide an oil-in-water emulsion composition that has high viscosity stability at high temperatures and is excellent in usability. The oil-in-water emulsion composition according to one embodiment of the present invention may contain components other than those described above.

[0010] <Emulsified Particles> One embodiment of the present invention is an oil-in-water emulsion composition in which an oil phase component and an aqueous phase component are emulsified, and the internal phase of the oil-in-water emulsion composition is an oil phase, and the external phase is an aqueous phase.

[0011] The average particle size of the emulsified particles in the oil-in-water emulsion composition according to one embodiment of the present invention is 2 μm to 12.5 μm, or may be 2.25 μm to 12 μm, 2.5 μm to 11.5 μm, 2.75 μm to 11.5 μm, 3 μm to 11.5 μm, 4 μm to 11.5 μm, 5 μm to 11.5 μm, 5.5 μm to 11.5 μm, 5.5 μm to 11 μm, 6 μm to 11 μm, 6.5 μm to 11 μm, 6.5 μm to 10.5 μm, 6.5 μm to 10 μm, 7 μm to 10.5 μm, or 7 μm to 10 μm. It may also be 2 μm to 10 μm or 3 μm to 8 μm. If the average particle size of the emulsion particles is less than 2 μm, the powder in the oil phase will aggregate when exposed to high-energy conditions such as high temperatures, and the powder will be more likely to escape from the emulsion particles, which will make the viscosity of the oil-in-water emulsion composition more likely to change.If the average particle size of the emulsion particles is more than 12.5 μm, it will be difficult to maintain the shape of the emulsion particles, and in this case too, it is thought that the viscosity will be more likely to change at high temperatures.

[0012] <Oil Phase Components> The oil phase of the oil-in-water emulsion composition according to one embodiment of the present invention can contain any oily component that can be normally used, within a range that does not impair emulsion stability. Examples of components contained in the oil phase of the oil-in-water emulsion composition according to one embodiment of the present invention include powder, oil, dispersant, and ultraviolet absorber.

[0013] The amount of oil phase components excluding powder in the oil-in-water emulsion composition is 20% by mass or more, preferably 23% by mass or more, and more preferably 25% by mass or more. When the amount of oil phase components excluding powder in the oil-in-water emulsion composition is 20% by mass or more, the viscosity is less likely to change at high temperatures and the viscosity stability is likely to be good. Furthermore, the amount of oil phase components excluding powder in the oil-in-water emulsion composition is not particularly limited as long as the oil-in-water properties are maintained, but is preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 35% by mass or less, and even more preferably 32% by mass or less.

[0014] Powder The powder contained in the oil phase of the oil-in-water emulsion composition according to one embodiment of the present invention includes a metal oxide. The metal oxide powder acts as an ultraviolet scattering agent. Furthermore, among powders other than metal oxides, those that have the ability to scatter ultraviolet light also act as ultraviolet scattering agents.

[0015] The shape of the powder particles in one 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 of the powder is not particularly limited, and the average primary particle size of the powder may be 2 nm to 50 μm, 500 nm to 50 μm, 1 μm to 50 μm, 2 μm to 50 μm, 5 μm to 50 μm, 5 μm to 40 μm, 5 μm to 30 μm, 8 μm to 30 μm, 10 μm to 30 μm, 10 μm to 20 μm, or 10 μm to 15 μm.

[0016] In this specification, the term "average primary particle diameter" refers to the diameter of a circle equivalent to the projected area of ​​a primary particle in a transmission electron microscope (TEM) image.

[0017] --Metal Oxide Powder-- The oil phase of the oil-in-water emulsion composition according to one embodiment of the present invention contains titanium oxide powder as a metal oxide powder, and may also contain other metal oxide powders. Examples of other metal oxide powders include, but are not limited to, powders of zinc oxide, iron oxide, cerium oxide, etc.

[0018] The titanium oxide powder contained in the oil-in-water emulsion composition according to one embodiment of the present invention has a silica coating. By providing the titanium oxide powder with a silica coating, the emulsion stability of the oil-in-water emulsion composition is more likely to be maintained even if there are areas that have not been hydrophobized. In the silica-coated titanium oxide powder, the silica coating is preferably present in one or more layers over the entire surface of the titanium powder, and more preferably in two or more layers. By providing the titanium oxide powder with a silica coating, the titanium powder surface is covered with silica, thereby suppressing the catalytic activity of the metal, improving stability when used in combination with an ultraviolet absorber, inhibiting discoloration, and improving the feel when used. Furthermore, having two or more silica coating layers can further enhance this effect.

[0019] When the oil-in-water emulsion composition according to one embodiment of the present invention contains a metal oxide other than titanium oxide, the metal oxide may be coated with silica for the same reasons as above, or may be coated with, for example, silicone, aluminum hydroxide, dextrin fatty acid ester, higher alcohol, fatty acid, etc.

[0020] The titanium oxide powder contained in the oil-in-water emulsion composition according to one embodiment of the present invention has been hydrophobized. Examples of hydrophobization treatments include dimethicone treatment, hydrogen dimethicone treatment, silicone treatment such as methyl hydrogen polysiloxane or methyl polysiloxane, fluorine treatment using perfluoroalkyl phosphate esters or perfluoroalcohols, amino acid treatment using N-acyl glutamic acid, and other treatments, such as lecithin treatment, metal soap treatment, fatty acid treatment, alkyl phosphate ester treatment such as monoalkyl phosphate ester treatment (e.g., cetyl phosphate treatment), aluminum hydroxide treatment, cetyl phosphate treatment, silane treatment, and cationic surfactant treatment such as distearyldimonium chloride treatment. One or more of these treatments may be used. Of these, dimethicone treatment, hydrogen dimethicone treatment, monoalkyl phosphate ester treatment, silane treatment, and cationic surfactant treatment are preferred. In particular, dimethicone treatment and cetyl phosphate treatment are preferred from the standpoints of high safety, low environmental impact, and emulsion stability.

[0021] When the oil-in-water emulsion composition according to one embodiment of the present invention contains a metal oxide other than titanium oxide, the metal oxide may be subjected to the above-mentioned hydrophobization treatment.

[0022] ---Hydrophobically Treated Silica-Coated Titanium Oxide Powder--- The content of hydrophobically treated silica-coated titanium oxide powder, which is obtained by hydrophobizing a titanium oxide powder having a silica coating on the surface thereof, in an oil-in-water emulsion composition is not particularly limited, but is preferably, for example, 1% by mass or more and 20% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and even more preferably 3% by mass or more and 8% by mass or less. When it is 1% by mass or more, the effect as an ultraviolet scattering agent can be sufficiently ensured, and when it is 20% by mass or less, the emulsion stability of the oil-in-water emulsion composition can be easily maintained, improving usability and maintaining freshness.

[0023] The hydrophobized silica-coated titanium oxide powder is present in the oil phase of the oil-in-water emulsion composition. The hydrophobized silica-coated titanium oxide powder is preferably silica-coated titanium oxide powder whose entire surface has been hydrophobized. When the entire surface of the silica-coated titanium oxide powder has been hydrophobized, it is easier to maintain the dispersion state of the hydrophobized silica-coated titanium oxide powder in the oil phase, and the powder is more likely to remain in the emulsified particles. It is presumed that even when the oil-in-water emulsion composition according to one embodiment of the present invention is exposed to high-energy conditions such as high temperatures, the powder is less likely to pop out of the oil phase, which is the internal phase, and the viscosity is less likely to change at high temperatures.

[0024] --Powder other than metal oxides-- The powder other than metal oxides is not particularly limited, and examples thereof 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, etc.) -, metal soaps (for example, 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 (e.g., yellow iron oxide, 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, aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium 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 202, Yellow No. 203, Green No. 3, and Blue No. 1, etc.);Natural pigments (e.g., chlorophyll, β-carotene, etc.);

[0025] -Oil- The oil that can be contained in the oil phase of the oil-in-water emulsion composition according to one embodiment of the present invention mainly includes non-volatile oils, such as liquid oils and fats, solid oils and fats, hydrocarbon oils, synthetic ester oils, silicone oils, and other oils.

[0026] 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.

[0027] 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.

[0028] Examples of hydrocarbon oils include hydrogenated polydecene, liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0029] Examples of synthetic ester oils include alkyl benzoate (C12-15), triethylhexanoin, 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, tetra-2-ethyl Pentaerythritol hexanoate, glycerin tri-2-ethylhexanoate, glycerin trioctanoate, glycerin triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, palmitate 2-heptylundecyl phosphate, 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.

[0030] 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.).

[0031] The oil phase of the oil-in-water emulsion composition according to one embodiment of the present invention may include a volatile oil, such as isododecane, dimethicone (1 cst, 1.5 cst, or 2 cst), caprylyl methicone, hydrogenated polyisobutene, undecane, tridecane, or isohexadecane.

[0032] In an oil-in-water emulsion composition according to one embodiment of the present invention, the amount of volatile oil in the oil phase components excluding powder, i.e., the amount of volatile oil relative to 100% by mass of the oil phase components excluding powder, is 15% by mass or less, preferably 12% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less. In an oil-in-water emulsion composition according to one embodiment of the present invention, when the amount of volatile oil in the oil phase components excluding powder is 15% by mass or less, oil separation during emulsification is unlikely, oil floating is unlikely to occur, resulting in a non-uniform emulsified state, and emulsified particles are unlikely to coalesce. It is preferable that the oil phase components excluding powder are substantially free of volatile oil, or that the oil-in-water emulsion composition is substantially free of volatile oil. In this specification, "substantially free of a specified component" means that the specified component is not intentionally blended, and in this case, the specified component may be unavoidably mixed in as an impurity. When a specified component is contained as an unavoidable impurity, the content thereof may be preferably 1% by mass or less, more preferably 0.5% by mass or less, and even more preferably 0% by mass, relative to the target component or composition.

[0033] -Dispersant- The oil-in-water emulsion composition according to one embodiment of the present invention preferably contains a dispersant. As used herein, the term "dispersant" refers to a substance for dispersing a powder in an oil phase. The dispersant is contained in the oil phase of the oil-in-water emulsion composition. Examples of dispersants include sorbitan sesquiisostearate, isostearic acid, PEG-12 dimethicone, bisbutyldimethicone polyglyceryl-3, polyhydroxystearic acid, polyglyceryl-6 polyricinoleate, sorbitan sesquiisostearate, distearyldimonium chloride, and amodimethicone. The content of the dispersant in the oil-in-water emulsion composition according to one embodiment of the present invention is preferably 0.1% to 3% by mass, more preferably 0.1% to 2% by mass, and even more preferably 0.1% to 1% by mass.

[0034] -Ultraviolet Absorber- From the viewpoint of enhancing the ultraviolet protection function, the oil-in-water emulsion composition according to one embodiment of the present invention preferably contains an ultraviolet absorber. The ultraviolet absorber is mainly contained in the oil phase of the oil-in-water emulsion composition.

[0035] Examples of ultraviolet absorbers include t-butyl methoxydibenzoylmethane, ethylhexyl triazone, 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, 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-methoxy cinnamate, 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'-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; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and the like.

[0036] <Aqueous Phase Components> The aqueous phase of the oil-in-water emulsion composition according to one embodiment of the present invention may contain aqueous components that are generally usable, within the range that does not impair emulsion stability, and includes, for example, a thickener.

[0037] -Thickener- The thickener used in the oil-in-water emulsion composition according to one embodiment of the present invention is not particularly limited, but is preferably a polymer thickener. When the thickener is a polymer, it becomes easier to produce an oil-in-water emulsion composition with a large emulsion particle size.

[0038] Furthermore, the thickener used in the oil-in-water emulsion composition according to one embodiment of the present invention is preferably one having a hydrophobic group, for example, one having a hydrophobic group such as a stearyl group, a behenyl group, or an alkyl group having 10 or more carbon atoms. When a thickener having a hydrophobic group is used, the thickener also acts as an emulsifier, making it easier to produce an oil-in-water emulsion composition with a large emulsion particle size.

[0039] Examples of thickeners include stearoxyhydroxypropylmethylcellulose, (acrylates / C10-30 alkyl acrylate) crosspolymer, xanthan gum, (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, (dimethylacrylamide / Na acryloyldimethyltaurate) crosspolymer, gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed, casein, dextrin, gelatin, sodium pectinate, Examples of suitable cellulose acetate copolymers include sodium alginate, methylcellulose, ethylcellulose, CMC, hydroxyethyl cellulose, hydroxypropyl cellulose, PVA, PVM, PVP, sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, magnesium aluminum silicate, bentonite, hectorite, magnesium aluminum silicate (Bee Gum), laponite, silicic anhydride, (dimethylacrylamide / sodium acryloyldimethyltaurate) copolymer, cellulose gum, succinoglycan, and carbomer.

[0040] <Surfactant> The oil-in-water emulsion composition according to one embodiment of the present invention may contain a surfactant. When the oil-in-water emulsion composition according to one embodiment of the present invention contains a surfactant, the surfactant content is preferably low, and is preferably 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, or 0.1% by mass or less. When the surfactant content in the oil-in-water emulsion composition according to one embodiment of the present invention is 5% by mass or less, good emulsion stability and a refreshing feel when used can be easily maintained.

[0041] The surfactant in the oil-in-water emulsion composition according to one embodiment of the present invention is not particularly limited as long as the object of the present invention can be achieved, and examples thereof include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

[0042] 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.

[0043] 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.

[0044] 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.).

[0045] Examples of nonionic surfactants include lipophilic nonionic surfactants and hydrophilic nonionic surfactants.

[0046] 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.

[0047] Examples of hydrophilic nonionic surfactants include PEG-100 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-40 hydrogenated castor oil, Beheneth-20, POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.); POE sorbitan fatty acid esters (e.g., POE-sorbitan monolaurate, POE-sorbitan monooleate, POE-sorbitan pentaoleate, POE-sorbitan monostearate, etc.); stearates, etc.); POE-glycerin fatty acid esters (for example, POE-monooleates such as POE-glycerin monostearate, 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, etc.); ether, POE-cholestanol ether, etc.); Pluronic (registered trademark) types (e.g., Pluronic (registered trademark), etc.); POE·POP-alkyl ethers (e.g., 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 (e.g., Tetronic, etc.); POE-castor oil hydrogenated castor oil derivatives (e.g., POE-castor oil, POE- hydrogenated castor oil, POE-hydrogenated castor oil monoisostearate, POE-hydrogenated castor oil triisostearate, 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;Examples include sucrose fatty acid esters; alkylethoxydimethylamine oxide; trioleyl phosphate;

[0048] <Other Components> The oil-in-water emulsion composition according to one embodiment of the present invention may contain other components in addition to those described above. Examples of other components include oil phase thickeners, humectants, waxes, higher fatty acids, higher alcohols, silicones, 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, and water. The composition can be produced by conventional methods according to the desired dosage form. Of the other components, oily components are present in the oil phase, and aqueous components are present in the aqueous phase. Specific components that can be incorporated into the oil-in-water emulsion composition according to one embodiment of the present invention are listed below.

[0049] Examples of oil phase thickeners include sugar fatty acid esters, solid oils, metal soaps, 12-hydroxystearic acid, bentonite, hectorite (e.g., dimethyl distearyl ammonium hectorite), and other inorganic polymers. Examples of sugar fatty acid esters include esters of fatty acids having 10 to 22 carbon atoms with dextrin, sucrose (e.g., sucrose tetrastearate triacetate), inulin, and the like, and specific examples include dextrin palmitate, dextrin myristate, dextrin (palmitate / ethylhexanoate), dextrin stearate, dextrin behenate, dextrin laurate, coconut oil fatty acid dextrin, sucrose palmitate, sucrose stearate, and inulin stearate.

[0050] Examples of moisturizing agents include glycerin, PEG-6, 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.

[0051] 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.

[0052] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Examples of water-soluble polymers include natural water-soluble polymers, semi-synthetic water-soluble polymers, and synthetic water-soluble polymers.

[0057] 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.).

[0058] 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.).

[0059] 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.

[0060] 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.

[0061] Examples of the lower alcohol include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0062] 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.;

[0063] Examples of sugars include monosaccharides, oligosaccharides, and polysaccharides.

[0064] 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.

[0065] Examples of oligosaccharides include sucrose, gunthianose, umbelliferose, lactose, planteose, isolychnoses, α,α-trehalose, raffinose, lychnoses, umbilicin, stachyose, verbascoses, and the like.

[0066] 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.

[0067] 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.

[0068] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Examples of vitamins include vitamins A, B1, B2, B6, C, E and derivatives thereof, pantothenic acid and derivatives thereof, biotin, etc.

[0073] Examples of antioxidants include tocopherols, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0074] 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.

[0075] Examples of the stabilizer include sodium pyrosulfite, EDTA-2Na, and dibutylhydroxytoluene (BHT).

[0076] Examples of percutaneous absorption inhibitors include polypropylene glycol (17).

[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, Mallow, Iris, Grape, Job's tears, Loofah, Lily, Saffron, Cnidium rhizome, Angelica acutiloba, Hypericum perforatum, Onion nonis, garlic, chili pepper, tangerine peel, angelica acutiloba, 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.); wrinkle improving agents (nicotinamide, etc.).

[0078] (Production of oil-in-water emulsion composition) The oil-in-water emulsion composition according to one embodiment of the present invention can be produced by a method for preparing a conventional cosmetic product. For example, after preparing the aqueous phase component and the oil phase component, the oil phase component is gradually added to the aqueous phase, and emulsified using an emulsifier or the like as needed, thereby producing the oil-in-water emulsion composition according to one embodiment of the present invention.

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

[0080] 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.

[0081] (Oil-in-water emulsion compositions) After preparing the aqueous phase components and oil phase components according to the formulations shown in Tables 1 to 5, the oil phase components were gradually added to the aqueous phase and emulsified using an emulsifier or the like as necessary to produce the oil-in-water emulsion compositions of Examples 1 to 18 and Comparative Examples 1 to 4. In Examples 8 to 10 and Comparative Examples 3 and 4, a surfactant was also added to the aqueous phase along with the oil phase components. The average emulsion particle size of each oil-in-water emulsion composition was measured, and the emulsion stability, viscosity stability, and usability were evaluated using the methods described below. The amount of volatile oil (% by mass) in the oil phase components excluding the powder is shown in Tables 1 to 5, rounded to the nearest whole number.

[0082] <Measurement of Average Emulsion Particle Size> The average emulsion particle size of the oil-in-water emulsion compositions of Examples 1 to 18 and Comparative Examples 1 to 4 was measured using a particle size measuring device Partica LA-950V2 (Horiba, Ltd.). The measurement was performed by diluting each oil-in-water emulsion composition with ion-exchanged water and adding it to a cell, adjusting the concentration so that the transmittance with a semiconductor laser was 80 to 90%, and setting the circulation / stirring speed conditions of the particle size measuring device to a circulation speed of 3 and a stirring speed of 1. The results are shown in Tables 1 to 5.

[0083] <Emulsion Stability> Immediately after preparation of the oil-in-water emulsion compositions of Examples 1 to 18 and Comparative Examples 1 to 4, the appearance and emulsion particles were observed under a microscope, and the emulsion stability was evaluated based on the following evaluation criteria. The results are shown in Tables 1 to 5.

[0084] [Evaluation criteria] A: The appearance is uniform and no coalescence of emulsified particles is observed. B: The emulsified state is non-uniform, with oil floating on the surface, or enlargement of emulsified particles is observed.

[0085] <Viscosity Stability> Two screw tubes (50 ml) filled with each of the oil-in-water emulsion compositions of Examples 1 to 18 and Comparative Examples 1 to 4 were prepared, and one tube was placed in a thermostatic bath at 25°C and the other in a thermostatic bath at 50°C. After standing for two weeks, the viscosity of each oil-in-water emulsion composition at each temperature was measured using a rotational viscometer. The viscosity ratio of each oil-in-water emulsion composition (viscosity ratio = viscosity after standing for two weeks at 50°C / viscosity after standing for two weeks at 25°C) was determined, and the degree of thickening or thinning of each oil-in-water emulsion composition upon temperature change was evaluated based on the following evaluation criteria. The results are shown in Tables 1 to 5.

[0086] [Evaluation criteria] A: Viscosity increase or decrease is within 15% (viscosity ratio is 0.85 or more and 1.15 or less) B: Viscosity increase or decrease is more than 15% and within 30% (viscosity ratio is 0.70 or more and less than 0.85, or more than 1.15 and 1.30 or less) C: Viscosity increase or decrease is more than 30% (viscosity ratio is less than 0.70 or more than 1.30)

[0087] <Usability> The smoothness, lightness of spreadability, and non-stickiness of the oil-in-water emulsion compositions of Examples 1 to 18 and Comparative Examples 1 to 4 were collectively defined as freshness, and a five-member expert panel rated the freshness of the compositions when directly applied to the face at 25°C according to the following [Evaluation of Freshness]. The scores given by each panelist were averaged, and the usability of the oil-in-water emulsion compositions of Examples 1 to 18 and Comparative Examples 1 to 4 was evaluated according to the following [Evaluation Criteria for Usability]. The results are shown in Tables 1 to 5.

[0088] [Evaluation of freshness] 5 points: Very fresh 4 points: Fresh 3 points: Somewhat fresh 2 points: Not very fresh 1 point: Not fresh at all

[0089] [Evaluation criteria for usability] A: Average score of 3.5 points or more B: Average score of 1.5 points or more and less than 3.5 points C: Average score of less than 1.5 points

[0090] An oil-in-water emulsion composition having a viscosity stability evaluation of "A" or "B" and a usability evaluation of "A" or "B" was determined to be applicable as an oil-in-water emulsion composition according to one embodiment of the present invention.

[0091]

[0092]

[0093]

[0094]

[0095]

[0096] Examples 1 to 18 were rated "A" or "B" for viscosity stability and "A" or "B" for usability.

[0097] In Comparative Example 1, the ultraviolet scattering agent was not coated with silica, and the viscosity stability was rated "C."

[0098] In Comparative Example 2, the amount of volatile oil in the oil phase components excluding the powder exceeded 15% by mass, resulting in an uneven emulsification state, such as oil floating immediately after emulsification, and coalescence of the emulsified particles, and the emulsion stability was rated as "B." Furthermore, due to poor emulsification, the viscosity stability could not be evaluated, and the average emulsion particle size could not be measured.

[0099] In Comparative Examples 3 and 4, the average emulsified particle size was less than 2 μm, the viscosity was prone to change at high temperatures, and the viscosity stability was rated "C."

[0100] From the above, it has been demonstrated that the oil-in-water emulsion composition according to one embodiment of the present invention can provide an oil-in-water emulsion composition that has high viscosity stability at high temperatures and is excellent in usability.

[0101] Examples of embodiments of the present invention include the following. <1> An oil-in-water emulsion composition containing hydrophobized silica-coated titanium oxide powder, wherein the average particle size of the emulsified particles is 2 μm to 12.5 μm, the amount of oil phase components excluding the powder in the oil-in-water emulsion composition is 20% by mass or more, and the amount of volatile oil in the oil phase components excluding the powder is 15% by mass or less. <2> The oil-in-water emulsion composition according to <1> above, which contains a thickener having a hydrophobic group. <3> The oil-in-water emulsion composition according to <1> or <2> above, which contains an ultraviolet absorber. <4> The oil-in-water emulsion composition according to <1>, <2> or <3> above, wherein the hydrophobized silica-coated titanium oxide powder comprises dimethicone-treated silica-coated titanium oxide powder.

[0102] According to any one of the oil-in-water emulsion compositions <1> to <4> above, the conventional problems can be solved and the object of the present invention can be achieved.

[0103] This application claims priority based on Japanese Patent Application No. 2024-101571, filed on June 24, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. An oil-in-water emulsion composition containing hydrophobically treated silica-coated titanium dioxide powder, wherein the average particle size of the emulsified particles is 2 μm to 12.5 μm, the amount of oil phase components excluding the powder in the oil-in-water emulsion composition is 20% by mass or more, and the amount of volatile oil in the oil phase components excluding the powder is 15% by mass or less.

2. The oil-in-water emulsion composition according to claim 1, which contains a thickener having a hydrophobic group.

3. The oil-in-water emulsion composition according to claim 1 or 2, which contains an ultraviolet absorber.

4. The oil-in-water emulsion composition according to claim 1 or 2, wherein the hydrophobically treated silica-coated titanium oxide powder comprises dimethicone-treated silica-coated titanium oxide powder.

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