Oil-in-water type cosmetic

Abstract

To provide an oil-in-water type cosmetic that has improved feel in use, water resistance, and stability, and that is capable of stably containing a sufficient amount of hydrophobic powder.SOLUTION: An oil-in-water type cosmetic comprising: component (A): silylated silica having an average particle diameter of 100 to 500 nm, component (B): a polyhydric alcohol having an IOB of 3.0 or less, component (C): a hydrocarbon oil and / or a silicone oil, component (D): a hydrophobic powder, and component (E): a pH adjuster, wherein the component (D) hydrophobic powder is contained in the internal phase.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water cosmetic that contains silica silylate and a hydrophobic powder in its internal phase, and that has excellent water resistance, a feeling of use, and stability. [Background technology]

[0002] Many makeup cosmetics are water-in-oil type, which has high water resistance from the viewpoint of cosmetic durability. However, because the outer phase is oily, there is a problem to be solved in that it feels sticky when used.

[0003] To address this issue, several oil-in-water makeup cosmetics have been proposed, the external phase of which is composed of aqueous components.

[0004] However, when oil-in-water cosmetics contain powder in the external phase, there are problems to be solved, such as a squeaky feeling during use and poor water resistance.

[0005] Additionally, oil-in-water cosmetics have been proposed that contain hydrophobic powder in the internal phase to reduce the squeaky feeling during use (Patent Documents 1 and 2).

[0006] However, the cosmetics of Patent Documents 1 and 2 use highly hydrophilic emulsifiers and dispersants to emulsify oils, and therefore have problems to be solved, such as stickiness during use and water resistance.

[0007] In addition, oil-in-water cosmetics have been proposed that use powder emulsification with silica silylate, which emulsifies without using highly hydrophilic surfactants or with only small amounts of them (Patent Document 3, Patent Document 4).

[0008] However, the cosmetics of Patent Documents 3 and 4 have a problem to be solved, in that they cannot stably contain a sufficient amount of hydrophobic powder as a makeup cosmetic. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 6599987 [Patent Document 2] Patent No. 5851724 [Patent Document 3] Patent No. 6831737 [Patent Document 4] Patent No. 6632977 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0010] The present invention has been made in view of the above-mentioned prior art, and the problem to be solved by the present invention is to provide an oil-in-water cosmetic that has improved usability, water resistance, and stability, and can stably contain a sufficient amount of hydrophobic powder. [Means for solving the problem]

[0011] As a result of extensive research conducted by the present inventors in order to achieve the above-mentioned object, the present inventors have discovered that an oil-in-water cosmetic having excellent water resistance, feel in use, and stability can be obtained by including silica silylate having an average particle size of 100 to 500 nm, a polyhydric alcohol having an IOB of 3.0 or less, a hydrocarbon oil and / or a silicone oil, a hydrophobic powder, and a pH adjuster, and by incorporating the hydrophobic powder in the internal phase (oil phase), thereby completing the present invention.

[0012] That is, the present invention is Component (A) Silica silylate with an average particle size of 100 to 500 nm Component (B) Polyhydric alcohol with an IOB of 3.0 or less Component (C) Hydrocarbon oil and / or silicone oil Component (D) Hydrophobic powder Component (E) pH adjuster and wherein the internal phase contains component (D) a hydrophobic powder. Also, in the oil-in-water cosmetic, the content of component (A) is 3 to 10% by mass. In addition, in the oil-in-water cosmetic, the content of component (B) in the polyhydric alcohol contained in the composition is 10% by mass or more. In addition, in the oil-in-water cosmetic, the content of component (C) is 60 mass % or more of the total oils contained in the composition. Also, in the oil-in-water cosmetic, the content of component (D) is 0.1 to 10.0% by mass. Also, in the oil-in-water cosmetic, the content of component (E) is 0.0001 to 1.0% by mass. The oil-in-water cosmetic further comprises a component (F) a thickener. In the oil-in-water cosmetic, it is also desirable that component (F) be one or more thickeners selected from sodium hyaluronate, xanthan gum, hydroxyethyl cellulose, plankton extract, and acrylic polymers, more preferably sodium hyaluronate, hydroxyethyl cellulose, and plankton extract. Also, in the oil-in-water cosmetic, the content of component (F) is 0.3 to 2.0% by mass. The oil-in-water cosmetic is also characterized in that it is a makeup cosmetic. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide an oil-in-water cosmetic that is excellent in usability, water resistance, and stability, and can stably contain a sufficient amount of hydrophobic powder. [Brief explanation of the drawings]

[0014] [Figure 1] 1 shows micrographs of the oil-in-water cosmetic composition of Example 12 immediately after preparation and after stress testing. [Figure 2] 1 shows micrographs of the oil-in-water cosmetic composition of Comparative Example 6 immediately after preparation and after a stress test. BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Preferred embodiments of the present invention will now be described. The oil-in-water cosmetic of the present invention contains component (A) silica silylate having an average particle size of 100 to 500 nm, component (B) a polyhydric alcohol having an IOB of 3.0 or less, component (C) a hydrocarbon oil and / or silicone oil, component (D) a hydrophobic powder, and component (E) a pH adjuster.

[0016] The average particle size of the component (A) silylated silica (hereinafter referred to as "component (A)") according to the present invention is preferably 100 to 500 nm, more preferably 100 to 300 nm. For example, an example of a silylated silica having an average particle size of 300 nm is Soliemer manufactured by Sanyo Chemical Industries, Ltd.

[0017] The content of component (A) according to the present invention is preferably 3 to 10% by mass in the oil-in-water cosmetic.

[0018] Although not particularly limited, the content ratio of component (A) to the oil phase containing hydrophobic powder is preferably silica silylate:oil phase containing hydrophobic powder=1:2 to 1:7.

[0019] Examples of polyhydric alcohols having an IOB of 3.0 or less as component (B) according to the present invention (hereinafter referred to as "component (B)") include ethylhexylglycerin, caprylyl glycol, 1,2-hexanediol, dipropylene glycol, 1,2-pentanediol, isopentyldiol, and 1,3-butanediol.

[0020] The content of component (B) according to the present invention is preferably 1 to 20% by mass in the oil-in-water cosmetic. Furthermore, the content of component (B) is preferably 10% by mass or more, more preferably 20% by mass or more, of the total polyhydric alcohols contained in the composition. If it is less than 10% by mass, the water resistance, usability, and stability may be poor.

[0021] Component (C) hydrocarbon oil and / or silicone oil (hereinafter referred to as "component (C)") according to the present invention includes, as hydrocarbon oils, for example, liquid paraffin, mineral oil, squalane, squalene, hydrogenated polybutene, hydrogenated polyisobutene, hydrogenated polydecene, hydrogenated polyolefin (C6-12), hydrogenated polyolefin (C6-20), hydrogenated poly(C6-12 olefin), hydrogenated poly(C6-14 olefin), hydrogenated poly(C6-20 olefin), Examples include (C9-12) alkanes, (C10-13) alkanes, (C13-15) alkanes, (C14-20) alkanes, (C14-22) alkanes, (C15-19) alkanes, (C15-23) alkanes, (C16-23) alkanes, (C18-21) alkanes, (C21-28) alkanes, petrolatum, ozokerite, paraffin, ceresin, microcrystalline wax, polyethylene, polypropylene, and synthetic waxes. 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, various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), and acrylic silicones.

[0022] The content of component (C) according to the present invention is preferably 6 to 20% by mass in the oil-in-water cosmetic. The content of component (C) in the total amount of oils contained in the composition is preferably 60% by mass or more, and more preferably 70% by mass or more. If the content is less than 60% by mass, the water resistance, feeling in use and stability may be poor.

[0023] The hydrophobic powder (hereinafter referred to as "component (D)") of the present invention refers to a powder that does not sink when sprinkled on the surface of purified water, or if it does sink, does not easily disperse uniformly in the purified water. Examples of powders that are themselves hydrophobic include pigments such as carbon black, Red 226, Blue 404, Yellow 205, and Yellow 401, resin powders such as silicone resin powder, polylactic acid powder, nylon powder, PMMA powder, polyurethane powder, polyethylene powder, polystyrene powder, polypropylene powder, and tetrafluoroethylene powder, and amino acid powders such as lauroyl lysine. Hydrophilic powders such as titanium oxide, iron oxide, and silica that have been subjected to hydrophobic treatment may also be used. Examples of hydrophilic powders include inorganic powders such as 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, boron nitride, cerium oxide, titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, titanium-titanium oxide sintered product, iron titanate, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt titanate, ultramarine, and Prussian blue. Examples of metal soaps include zinc myristate, calcium palmitate, and aluminum stearate. Examples of pearl pigments include titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, bismuth oxychloride, and fish scale foil. Examples of metal powder pigments include aluminum powder and copper powder. Examples of organic pigments such as zirconium, barium, or aluminum lakes include Red 201, Red 202, Red 204, Red 205, Red 220, Red 226, Red 228, Red 405, Orange 203, Orange 204, Yellow 205, Yellow 401, and Blue 404, as well as Red 3, Red 104, Red 106, Red 227, Red 230, Red 401, Red 505, Orange 205, Yellow 4, Yellow 5, Yellow 202, Yellow 203, Green 3, and Blue 1. Examples of natural pigments include chlorophyll and β-carotene. The hydrophobic treatment is not particularly limited as long as it is a treatment that is applied to ordinary cosmetic powders, and examples thereof include silicone treatment using dimethylpolysiloxane, methylhydrogenpolysiloxane, dimethiconol, amodimethicone, aminopropyltriethoxysilane, carboxydecyltrisiloxane, carboxydecyldimethicone, silicone elastomer, etc.; alkylalkoxysilane treatment using methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, etc.; fluorine compound treatment using perfluoroalkylphosphate, perfluoropolyether, perfluoropolyether alkylphosphate, etc.; Examples of hydrophobic treatments include amino acid treatments using N-acyl glutamic acid, N-acylaspartic acid, N-acyl lysine, N-acyl proline, N-acyl sarcosine, lysine, etc.; lecithin treatments using lecithin, hydrogenated lecithin, etc.; metal soap treatments using magnesium stearate, zinc stearate, calcium stearate, aluminum dimyristate, etc.; ester oil treatments such as sebacate esters, isostearate esters, diisostearyl malate, dimer dilinoleate (phytosteryl / isostearyl / cetyl / stearyl / behenyl), beeswax, candelilla wax, and carnauba wax; and organic titanate treatments using isopropyl titanium triisostearate, etc. These hydrophobic treatments can be carried out singly or in combination. These hydrophobic treatments can be carried out by conventional methods. Examples of hydrophilic powders that have been hydrophobized include silane-treated titanium oxide, silane-treated yellow iron oxide, silane-treated red iron oxide, silane-treated black iron oxide, etc. These are commercially available as ALT-TSR-10, ALT-RHP-10, ALT-YHP-10, and ALT-BHP-10 (manufactured by Miyoshi Chemicals Co., Ltd.).

[0024] The content of component (D) in the composition is preferably 0.1 to 10.0% by mass. If the content is less than 0.1% by mass or more than 10.0% by mass, the feeling of use and stability may be poor.

[0025] Component (D) is preferably contained in the internal phase (oil phase).

[0026] Examples of component (E) pH adjusters (hereinafter referred to as "component (E)") according to the present invention include citric acid, lactic acid, sodium citrate, sodium lactate, potassium hydroxide, sodium hydroxide, disodium phosphate, potassium phosphate, triethanolamine, aminomethylpropanol, aminomethylpropanediol, arginine, and aspartic acid.

[0027] The content of component (E) is preferably 0.0001 to 1.0 mass %, more preferably 0.001 to 0.5 mass %. If the content is more than 1.0 mass %, the stability may be poor. In the present invention, it has been found that the dispersibility of silylated silica in water is improved by adding silica silylated to an aqueous phase containing a polyhydric alcohol that is alkaline (pH higher than 7.0) and has an IOB of 3.0 or less. It is believed that emulsification occurs when an oil phase containing a specific content of hydrocarbon oil and / or silicone oil is added to the aqueous phase and emulsified, with the silica silylated acting on the interface between the aqueous and oil phases. Furthermore, it is believed that emulsion stability is improved by adding an acidic pH adjuster such as citric acid to the aqueous phase (external phase) after emulsification to adjust the pH to 5.0 to 7.0.

[0028] Examples of the thickener component (F) (hereinafter referred to as "component (F)") according to the present invention include sodium hyaluronate, xanthan gum, hydroxyethyl cellulose, plankton extract, and acrylic polymers, and more preferably sodium hyaluronate, hydroxyethyl cellulose, and plankton extract.

[0029] From the viewpoint of suppressing sedimentation of the silica silylate and hydrophobic powder and of emulsion stability, the content of component (F) is preferably 0.3 to 2.0% by mass.

[0030] In addition to the above-mentioned essential components, the oil-in-water cosmetic of the present invention can contain appropriate components that are typically used in oil-in-water cosmetic compositions for cosmetics and quasi-drugs, and is produced according to conventional methods. Specific components that can be contained are listed below.

[0031] The oily components that can be contained in the present invention include liquid oils and fats, such as 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, Japanese kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, germ oil, and triglycerin.

[0032] Examples of solid fats and oils include shea butter, 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 foot fat, Japan wax, and hardened castor oil.

[0033] 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.

[0034] 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).

[0035] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetanol, 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.

[0036] Ester oils include isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethylethylhexanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate Ingredients: Glycerin Tri-2-Ethylhexanoate, Glycerin Triethylhexanoate, 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, 2-Heptyl Palmitate Examples of the alkyl acrylate copolymer include 2-hexylundecyl lauroyl glutamate, 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.

[0037] Examples of moisturizing agents include chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, melilot extract, and cyclic amino acids.

[0038] Examples of powder components 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, tungstate metal salts, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluoroapatite, hydroxyapatite, ceramics, etc.) black powder, metal soap (e.g., zinc myristate, calcium palmitate, aluminum stearate), boron nitride, etc.), organic powder (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 pigment (e.g., zinc oxide, etc.), inorganic red pigment (e.g., iron titanate, etc.), inorganic purple pigment (e.g., manganese violet, cobalt violet, etc.), inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.), inorganic blue pigments (e.g., ultramarine, iron 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.), organic pigments such as zirconium, barium or aluminum lake (e.g., Examples include 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; and natural pigments (e.g., chlorophyll, β-carotene, etc.).

[0039] 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 (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.), higher fatty acid ester sulfate salts (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 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, sodium caseinate, etc.

[0040] Examples of cationic surfactants include alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.), alkylpyridinium salts (e.g., cetylpyridinium chloride, etc.), dialkyldimethylammonium salts (e.g., distearyldimethylammonium chloride), 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.

[0041] 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.), and betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine, etc.).

[0042] 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.

[0043] Examples of hydrophilic nonionic surfactants include POE-sorbitan fatty acid esters (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.), POE sorbit fatty acid esters (e.g., POE-sorbitan monolaurate, POE-sorbit monooleate, POE-sorbitan pentaoleate, POE-sorbit monostearate, etc.), POE-glycerin fatty acid esters (e.g., POE-glycerin POE-monooleates such as POE-glycerol monoisostearate, POE-glycerol triisostearate, etc.), POE-fatty acid esters (e.g., POE-distearate, POE-monodioleate, ethylene glycol distearate, etc.), POE-alkyl ethers (e.g., POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE-cholestanol ether, 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-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, etc.), Examples of suitable oleic acid esters include coconut oil monopyroglutamic acid monoisostearate diester, POE-hydrogenated castor oil maleic acid, etc., POE-beeswax and 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, and trioleyl phosphate.

[0044] Examples of oil-based thickeners include organically modified clay minerals such as stearalkonium hectorite, disteardimonium hectorite, and quaternium-18 hectorite; sugar esters such as dextrin palmitate, dextrin myristate, (palmitate / 2-ethylhexanoate) dextrin, sucrose palmitate, fructooligosaccharide stearate, and inulin stearate; fatty acids such as 12-hydroxystearic acid; esters such as trihydroxystearin; dibutyl lauroyl glutamide; and dibutyl ethylhexanoyl glutamide. Examples of the polymers include amino acid derivatives of the above, polyamide resins such as polyamide-3 and polyamide-8, polymers such as (styrene / isoprene) copolymer, (ethylene / propylene / styrene) copolymer, (styrene / butadiene) copolymer, (styrene / ethylene / butylene) copolymer, (styrene / propylene / butylene) copolymer, (styrene / butylene) copolymer, (ethylene / propylene) copolymer, and hydrogenated (styrene / isoprene) copolymer, and fumed silicic anhydride such as hydrophobized silica, and the like. These may be used alone or in combination. Examples of the treatment method for the hydrophobized fumed silicic anhydride include trimethylsiloxy treatment with trimethylsilyl chloride or hexamethyldisilazane, octylsilanization treatment, coating and baking treatment using methylhydrogenpolysiloxane, and coating with metal soap.

[0045] Examples of aqueous thickeners include natural water-soluble polymers, such as plant-based polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, locust bean gum, tamarind gum, carrageenan, pectin, agar, quince seed (quince), algae colloid (cassow extract), starch (rice, corn, potato, wheat), glycyrrhizic acid), microbial polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.), and animal-based polymers (e.g., collagen, casein, albumin, gelatin, etc.).

[0046] Examples of semi-synthetic water-soluble polymers that can be used as aqueous thickeners include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, dextrin, etc.), cellulose-based polymers (e.g., methyl cellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, dialkyldimethylammonium cellulose sulfate, crystalline cellulose, cellulose powder, etc.), and alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

[0047] Examples of synthetic water-soluble polymers used as aqueous thickeners include 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, etc.), polyoxyethylene polyoxypropylene copolymer polymers (e.g., PEG / PPG-450 / 50 trimethylolpropane dodecyl ether, etc.), acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylate crosspolymer, polyacrylamide, (dimethylacrylamide), etc.), and the like. Examples of the copolymer include (acrylic acid / sodium acryloyldimethyltaurate) crosspolymer, (dimethylacrylamide / sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (acrylates / C10-30 alkyl acrylate) crosspolymer, (alkyl acrylate / steareth-20 methacrylate) copolymer, (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, polyethyleneimine, cationic polymer, PEG-240 / decyltetradeceth-20 / hexamethylene diisocyanate copolymer, and polyurethane polymers.

[0048] Other aqueous thickeners include, for example, sodium pectinate, sodium alginate, aluminum magnesium silicate, bentonite, hectorite, AlMg silicate (veegum), laponite, and fumed anhydrous silicic acid.

[0049] Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0050] Examples of polyhydric alcohols include dihydric alcohols (e.g., ethylene glycol, propylene glycol, trimethylene glycol, 1,2-butanediol, 1,3-butanediol, tetramethylene glycol, 1,2-pentanediol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, etc.), trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.), tetrahydric alcohols (e.g., pentaerythritol, 1,2,6-hexanetriol, etc.), pentahydric alcohols (e.g., xylitol, etc.), and hexahydric alcohols (e.g., hexahydric alcohols). Alcohols (e.g., sorbitol, mannitol, etc.), polyalcohol polymers (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerin, tetraglycerin, polyglycerin, etc.), dihydric alcohol alkyl ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether ... diethylene 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 (for example, 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 ether Examples of suitable glycerols include glycerol ethers (e.g., xyl alcohol, selachyl alcohol, batyl alcohol, etc.), sugar alcohols (e.g., sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch-decomposed sugars, maltose, xylitose, starch-decomposed sugar-reduced alcohols, inositol, 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, and polyglycerin.

[0051] Examples of the ultraviolet absorber include benzoic acid-based ultraviolet absorbers (e.g., 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., amyl salicylate, menthyl salicylate, etc.), and the like. methyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.), cinnamic acid-based ultraviolet absorbers (e.g., 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 salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.), Ctyl-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,Examples include 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, and 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one.

[0052] 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- Examples of sugars include heptoses (e.g., aldoheptose, heptose), octose (e.g., octulose), deoxysugars (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose), aminosugars (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid), and uronic acids (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid).

[0053] Examples of oligosaccharides include sucrose, guanthianose, umbelliferose, lactose, planteose, isolychnoses, α,α-trehalose, raffinose, lychnoses, umbilicin, stachyose, and verbascoses. Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.), basic amino acids (e.g., hydroxylysine, etc.), etc. Examples of amino acid derivatives include sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

[0054] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0055] 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.

[0056] 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.

[0057] Other ingredients that may be contained include, for example, preservatives (ethylparaben, butylparaben, etc.), whitening agents (for example, placenta extract, saxifrage extract, arbutin, etc.), blood circulation promoters (nicotinic acid, benzyl nicotinate, tocopherol nicotinate, β-butoxy nicotinic acid ester, minoxidil or its analogs, vitamin E, γ-oryzanol, alkoxycarbonylpyridine N-oxide, carpronium chloride, and acetylcholine or its derivatives, etc.), various extracts (for example, , ginger, Phellodendron bark, Coptis chinensis, Lithospermum root, Birch, Loquat, carrot, aloe, mallow, iris, grape, loofah, lily, saffron, Cnidium rhizome, Angelica acutiloba, St. John's wort, Ononis, garlic, chili pepper, Tangerine peel, Angelica acutiloba, Peony, seaweed, etc.), activators (e.g., panthenyl ethyl ether, nicotinamide, biotin, pantothenic acid, royal jelly, cholesterol derivatives, etc.), antiseborrheic agents (e.g., pyridoxines, thianthol, etc.), etc. [Example]

[0058] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples. Contents are expressed in mass % unless otherwise specified.

[0059] Preparation of oil-in-water cosmetic compositions: Oil-in-water cosmetics of the Examples and Comparative Examples were prepared with the compositions shown in Tables 1 to 7 below, and the resulting cosmetics were evaluated for usability, water resistance, and stability according to the following criteria. The results are also shown in the tables.

[0060] (Feeling of use) For each sample, a panel of 10 expert sensory evaluators judged and scored the feel of use (non-stickiness upon application, non-squeakiness) on a 5-point scale using the following evaluation criteria. The average score was calculated from the total scores of all panelists for each sample and judged using the following 4-point scale. "Evaluation Criteria" 5 points: Good 4 points: Fairly good 3 points: Average 2 points: slightly poor 1 point: Defective 4-level evaluation scale (Judgment): (Average score) ◎: 4 points or more ○: 2.5 points or more and less than 4 points △: 1.5 points or more and less than 2.5 points ×: Less than 1.5 points

[0061] (water resistance) For each sample, 10 expert panelists judged whether the cosmetic product had smeared or smudged due to tears or sweat six hours after application and assigned a score on a 5-point scale according to the following evaluation criteria. The average score of all panelists for each sample was calculated and judged according to the 4-point scale below. (Score) (Content) 5 points: Very good (does not smudge or bleed) 4 points: Fairly good 3 points: Average 2 points: Somewhat bad 1 point: Very bad (Judgment): (Average score) ◎: 4 points or more ○: 2.5 points or more and less than 4 points △: 1.5 points or more and less than 2.5 points ×: Less than 1.5 points

[0062] (stability) Each cosmetic product obtained in the Examples and Comparative Examples was filled into two standard bottles (50 ml), and one bottle was subjected to a stress test in which it was rotated horizontally at 45 rpm for 6 hours. The state of the emulsion particles in the composition immediately after preparation and after the stress test was observed at 200x magnification using an optical microscope (BX53: manufactured by Olympus Corporation). The appearance was also visually inspected for the presence or absence of separation. "Evaluation Criteria" ◎: No separation was observed before or after the severe test, and the state of the emulsified particles remained unchanged. ○: No separation was observed before or after the severe test, but some aggregation of emulsified particles was observed. △: No separation was observed before or after the severe test, but aggregation of emulsified particles was observed. ×: Separation was observed before and after the severe test, and significant aggregation of emulsified particles was observed. In this stability test, △ is preferable, ◯ is more preferable, and ⊚ is even more preferable, and test examples that received an evaluation of △ or higher (◎, ○, △) were judged to be at a practical level.

[0063] First, the inventors prepared oil-in-water cosmetics of Examples and Comparative Examples with the compositions shown in Table 1, evaluated the water resistance, feel in use, and stability of the obtained oil-in-water cosmetics, and investigated publicly used silica silylate.

[0064] (Method for preparing oil-in-water cosmetic compositions in Table 1) (1) Mix ingredients 1 to 6. (2) Mix ingredients 7 to 11. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 12 to 15 to (3) and mix.

[0065] [Table 1] *1 Soliemer (manufactured by Sanyo Chemical Industries, Ltd.) *2 AEROSIL R976 (manufactured by Nippon Aerosil Co., Ltd.) *3 AEROSIL RX300 (manufactured by Nippon Aerosil Co., Ltd.) *4 ALT-TSR-10 (Miyoshi Chemicals Co., Ltd.) *5 ALT-YHP-10 (manufactured by Miyoshi Kasei) *6 ALT-RHP-10 (Miyoshi Chemicals Co., Ltd.) *7 ALT-BHP-10 (Miyoshi Chemicals Co., Ltd.)

[0066] As is clear from Table 1, Example 1, which used silica silylate with an average particle size of 300 nm, provided an oil-in-water cosmetic that had a good feel when used, free from squeaky or sticky sensations, and also had excellent water resistance and stability. On the other hand, the oil-in-water cosmetics of Comparative Examples 1 and 2, which used silica silylate with an average particle size of 7 nm, were excellent in water resistance, but were inferior in feel and stability. For this reason, the average particle size of silica silylate is preferably 100 to 500 nm, more preferably 100 to 300 nm.

[0067] Next, oil-in-water cosmetics of Examples and Comparative Examples were prepared with the compositions shown in Table 2, and the resulting cosmetics were evaluated for usability, water resistance, and stability, and suitable polyhydric alcohols were investigated.

[0068] (Method for preparing oil-in-water cosmetic compositions in Table 2) (1) Mix ingredients 1 to 13. (2) Mix ingredients 14 to 18. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 19 to 22 to (3) and mix.

[0069] [Table 2]

[0070] As is clear from the results in Table 2, in Examples 1 to 8, in which the polyhydric alcohols with an IOB of 3.0 or less contained in the composition accounted for 20 mass% or more of the total amount of polyhydric alcohols, oil-in-water cosmetics were obtained that had good water resistance and stability and a good, non-sticky feel when used. On the other hand, in Comparative Examples 3 to 5, which did not contain a polyhydric alcohol with an IOB of 3.0 or less in the composition, the water resistance, feel in use, and stability were poor. For this reason, the content of polyhydric alcohols having an IOB of 3.0 or less in the composition is preferably 10% by mass or more, and more preferably 20% by mass or more, of the total polyhydric alcohols.

[0071] Next, the inventors investigated suitable ingredients and their ratios in the oil agent in the water-based cosmetic composition with the composition shown in Table 3.

[0072] (Method for preparing oil-in-water cosmetic compositions in Table 3) (1) Mix ingredients 1 to 4. (2) Mix ingredients 5 to 13. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 14 to 17 to (3) and mix.

[0073] [Table 3] *8 DOWSIL SH 200 C Fluid 6cSt (Dow Toray) *9 DOWSIL SH 556 Fluid (Dow Toray)

[0074] As is clear from the results in Table 3, Comparative Example 6, in which the content of component (C) was 50 mass % or less of the total oil contained in the composition, was poor in water resistance, feel in use, and stability. On the other hand, in Examples 1 and 9 to 13, in which the content of component (C) was 70 mass % or more of the total oil contained in the composition, oil-in-water cosmetics with excellent water resistance, feel in use, and stability were obtained. For this reason, the content of component (C) is preferably 60% by mass or more, and more preferably 70% by mass or more, of the total amount of oil contained in the composition.

[0075] Next, the inventors investigated the phase containing component (D) and the inclusion of hydrophobic powder and hydrophilic powder in the compositions shown in Table 4.

[0076] (Method for preparing oil-in-water cosmetic of Example 1) (1) Mix ingredients 1 to 4. (2) Mix ingredients 5 to 9. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 14 to 18 to (3) and mix.

[0077] (Method for preparing oil-in-water cosmetic of Comparative Example 7) (1) Mix ingredients 1 to 4. (2) Mix ingredients 6 to 9 and 16. (3) Add ingredient 5 to (1) and emulsify using a homomixer. (4) Add (2), ingredients 14, 15, 17, and 18 to (3) and mix.

[0078] (Method for preparing oil-in-water cosmetic of Comparative Example 8) (1) Mix ingredients 1 to 4. (2) Add ingredient 5 to (1) and emulsify using a homomixer. (3) Add ingredients 10 to 18 to (2) and mix.

[0079] [Table 4] *10 DOWSIL ES-5373 Formulation Aid (manufactured by Dow Toray)

[0080] As is clear from the results in Table 4, in Example 1, in which component (D) was contained in the internal phase, an oil-in-water cosmetic preparation excellent in water resistance, feel during use, and stability was obtained. On the other hand, Comparative Example 7, which contained component (D) in the external phase, required a highly hydrophilic dispersant to stably disperse the hydrophobic powder in the external phase, and was therefore inferior in water resistance and usability. Furthermore, Comparative Example 8, which contained a hydrophilic powder in the outer phase, was inferior in water resistance, feel during use, and stability. For this reason, it is preferable to contain component (D) in the internal phase.

[0081] Next, the inventors investigated the pH before and after emulsification and the content of the pH adjuster in the oil-in-water cosmetic composition of the present invention using the composition shown in Table 5.

[0082] (Method for preparing oil-in-water cosmetic compositions in Table 5) (1) Mix ingredients 1 to 4. (2) Mix ingredients 5 to 9. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 10 to 13 to (3) and mix.

[0083] [Table 5]

[0084] As is clear from Table 5, in Comparative Example 9 in which the pH before emulsification was lower than 7, the dispersion of the silica silylate was insufficient, and emulsification itself was not possible. In Comparative Examples 10 and 11, which contained a pH adjuster, had a pH of 7 or higher before emulsification, and had a pH higher than 7 immediately after preparation, the emulsion particles progressed to coalescence after the stability test, resulting in poor stability. Examples 1, 14, and 15, which contained a pH adjuster and had a pH of 7 or higher before emulsification and a pH of 7 or lower immediately after preparation, showed excellent stability. From the above results, it is preferable that the pH before emulsification is higher than 7 and the pH immediately after preparation is 7 or less, from the viewpoint of dispersibility of silica silylate. Furthermore, regarding the content of the pH adjuster, since excellent stability was shown in Example 14, which contained 0.0002% by mass of the pH adjuster, it is preferable that the pH adjuster be contained in an amount of 0.0001% by mass or more.

[0085] Next, the inventors investigated the content of silica silylate in the oil-in-water cosmetic composition according to the present invention using the composition shown in Table 6.

[0086] (Method for preparing oil-in-water cosmetic compositions in Table 6) (1) Mix ingredients 1 to 4. (2) Mix ingredients 5 to 9. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 10 to 13 to (3) and mix.

[0087] [Table 6]

[0088] As is clear from Table 6, Examples 1 and 16 to 18, in which the content of silica silylate was 3 to 10 mass %, were excellent in water resistance, feeling in use, and stability. On the other hand, in Comparative Examples 12 and 13, in which the silica content was 1% by mass or less, emulsions could not be obtained due to poor emulsification. Comparative Example 14, in which the silica content was 15% by mass, was excellent in water resistance and stability, but the feeling of use was poor. From the above results, the content of silica silylate is preferably 3 to 10 mass %.

[0089] Next, the inventors investigated the type of thickener in the oil-in-water cosmetic composition according to the present invention using the composition shown in Table 7.

[0090] (Method for preparing oil-in-water cosmetic compositions in Table 7) (1) Mix ingredients 1 to 4. (2) Mix ingredients 5 to 9. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 10 to 18 to (3) and mix.

[0091] [Table 7] *11 SeaBalance 2000 CH (Carbonwave) *12 Aristoflex AVC (Clariant Japan)

[0092] As is clear from Table 7, in Comparative Example 15 using carbomer, poor emulsification occurred and no emulsion was obtained. The other thickeners were excellent in water resistance, usability, and stability. Furthermore, from the viewpoint of suppressing sedimentation of the silica silylate and hydrophobic powder and of emulsion stability, the content of the thickener was preferably 0.3 to 2.0 mass %.

[0093] Formulation examples of the oil-in-water cosmetic preparations of the present invention are given below, but the technical scope of the present invention is not limited to these. All of the obtained oil-in-water cosmetic preparations were excellent in water resistance, feel during use, and stability.

[0094] Example 23 A liquid foundation was prepared according to the following formulation and preparation method. (Prescription) Component name Mass (%) 1. Silica silylate*1 5.00 2.1,2-Pentanediol 5.00 3.Wednesday 20.00 4. Aminomethylpropanol 0.01 5. Phenyl trimethicone *9 4.00 6. Caprylyl Methicone *13 3.00 7. Dimethicone *8 3.00 8. Triethylhexanoin 1.00 9. Titanium dioxide treated with isopropyl triisostearate 7.50 10. Isopropyl titanium triisostearate treated red iron oxide 0.60 11. Yellow iron oxide treated with isopropyl titanium triisostearate 0.30 12. Isopropyl titanium triisostearate treated black iron oxide 0.15 13. Silane-treated silica (Al / Ca / Na) *14 1.00 14. Aspartic acid 0.01 15. Phenoxyethanol 0.50 16. Xanthan gum 0.20 17. Hydroxyethylcellulose 0.30 18.Water Residual Total 100 *13 DOWSIL SS-3408 (Dow Toray) *14 MiyoHAZE BB-ALT (Miyoshi Chemicals Co., Ltd.)

[0095] (Preparation method) (1) Mix ingredients 1 to 4. (2) Mix ingredients 5 to 13. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 14 to 18 to (3) and mix.

[0096] The resulting liquid foundation had excellent water resistance, feel in use, and stability.

[0097] Example 24 A makeup base was prepared according to the following formulation and preparation method. (Prescription) Component name Mass (%) 1. Silica silylate*1 5.00 2.1,2-Hexanediol 2.00 3. Dipropylene Glycol 3.00 4.Wednesday 20.00 5. Triethanolamine 0.01 6. Phenyl trimethicone *9 6.00 7. Triethylhexanoin 1.00 8. Ethylhexyl methoxycinnamate 2.00 9. Diethylaminohydroxybenzoylhexyl benzoate 1.00 10. Amino acid-treated titanium dioxide*15 2.60 11. Amino acid-treated yellow iron oxide*16 0.20 12. Amino acid-treated red iron oxide*17 0.10 13. Amino acid-treated black iron oxide*18 0.05 14. Stearic acid-treated titanium dioxide fine particles*19 1.00 15. Silane-treated zinc oxide fine particles*20 3.00 16. Citric acid 0.01 17. Phenoxyethanol 0.50 18. Plankton Extract *11 1.00 19. Sodium hyaluronate 0.20 20.Water Residual Total 100 *15 NAI-Titanium CR-50 (manufactured by Miyoshi Chemicals Co., Ltd.) *16 NAI-Yellow LL-100P (manufactured by Miyoshi Kasei) *17 NAI-Red R-516PS (Miyoshi Chemicals Co., Ltd.) *18 NAI-Black BL-100P (Miyoshi Kasei Co., Ltd.) *19 STR-100C-LF (Sakai Chemical Industry Co., Ltd.) *20 FINEX-30-OTS (Sakai Chemical Industry Co., Ltd.)

[0098] (Preparation method) (1) Mix ingredients 1 to 5. (2) Mix ingredients 6 to 15. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 16 to 20 to (3) and mix.

[0099] The resulting makeup base was excellent in water resistance, feel in use, and stability.

[0100] Example 25 A liquid blush was prepared according to the following formulation and preparation method. (Prescription) Component name Mass (%) 1. Silica silylate*1 5.00 2.1,2-Hexanediol 2.00 3. Dipropylene Glycol 3.00 4.Wednesday 10.00 5. Ethanol 10.00 6. Triethanolamine 0.01 7. Phenyl trimethicone *9 6.00 8. Caprylyl Methicone *11 3.00 9. Squalane 3.00 10. Triethylhexanoin 1.00 11. Hydrogenated (styrene / isoprene) copolymer *21 2.00 12. Metal soap-treated titanium dioxide*22 1.00 13. Red No. 226 0.55 14. Silane-treated Yellow No. 4 0.15 15. Citric acid 0.01 16. Phenoxyethanol 0.50 17. Sodium Polyacroyldimethyltaurate*23 0.15 18. Sodium hyaluronate 0.20 19.Water Residual Total 100 *21 PIONEIR GEL 12 PAO (manufactured by Hansen&Rosenthal KG) *22 MI-Titanium CR-50 (Miyoshi Chemicals Co., Ltd.) *23 Aristoflex Silk (Clariant Japan)

[0101] (Preparation method) (1) Mix ingredients 1 to 6. (2) Mix ingredients 7 to 14. (3) Add (2) to (1) and emulsify using a homomixer. (4) Add ingredients 15 to 19 to (3) and mix.

[0102] The resulting liquid blush had excellent water resistance, feel in use, and stability. [Industrial Applicability]

[0103] The oil-in-water cosmetic of the present invention is excellent in usability, water resistance, and stability, and can stably contain a sufficient amount of hydrophobic powder.

Claims

1. Component (A) silica silylate having an average particle size of 100 to 500 nm; Component (B) a polyhydric alcohol having an IOB of 3.0 or less; Component (C) hydrocarbon oil and / or silicone oil, Component (D) hydrophobic powder, Component (E) pH adjuster, and containing component (D) a hydrophobic powder in the internal phase.

2. 2. The oil-in-water cosmetic according to claim 1, wherein the content of component (A) is 3 to 10% by mass.

3. 2. The oil-in-water cosmetic according to claim 1, wherein the content of component (B) is 10% by mass or more of the total polyhydric alcohols contained in the composition.

4. 2. The oil-in-water cosmetic according to claim 1, wherein the content of component (C) is 60% by mass or more of the total oils contained in the composition.

5. 2. The oil-in-water cosmetic according to claim 1, wherein the content of component (D) is 0.1 to 10.0% by mass.

6. 2. The oil-in-water cosmetic according to claim 1, wherein the content of component (E) is 0.0001 to 1.0% by mass.

7. The oil-in-water cosmetic according to claim 1, further comprising a component (F) a thickener.

8. 8. The oil-in-water cosmetic according to claim 7, wherein component (F) is one or more thickeners selected from sodium hyaluronate, xanthan gum, hydroxyethyl cellulose, plankton extract, and acrylic polymers, more preferably sodium hyaluronate, hydroxyethyl cellulose, and plankton extract.

9. 8. The oil-in-water cosmetic according to claim 7, wherein the content of component (F) is 0.3 to 2.0% by mass.

10. 2. The oil-in-water cosmetic according to claim 1, which is a makeup cosmetic.

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