Oil-in-water emulsion type skin topical composition

Abstract

To provide a water-in-oil emulsified composition for external application to skin that does not cause stickiness during its application and spreads well on the skin, and has excellent stability over time and temperatures.SOLUTION: A water-in-oil emulsified composition for external application to skin contains (A) a volatile hydrocarbon and (B) amorphous silica.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-in-oil emulsion type composition for external use on the skin. [Background technology]

[0002] One of the formulations of external skin preparations such as cosmetics is the water-in-oil emulsion type. Water-in-oil emulsion compositions have advantages such as a high occlusive effect due to the presence of an oily component in the continuous phase, and high moisturizing properties.

[0003] There is a demand for cosmetics to be spread thinly and evenly on the skin, and in oil-based cosmetics this has been achieved by blending powders such as inorganic amorphous plate-like particles (Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-164448 Summary of the Invention [Problem to be solved by the invention]

[0005] While water-in-oil emulsion compositions are preferred for their moisturizing feel after application, they may feel sticky when applied to the skin or may not spread well. In view of the above circumstances, an object of the present invention is to provide a water-in-oil emulsion type external skin composition that is not sticky when applied, is easy to spread, and has excellent stability over time and temperature. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have discovered that the above-mentioned problems can be solved by using a volatile hydrocarbon in combination with irregular amorphous silica, and have thus completed the present invention.

[0007] That is, the present invention is as follows. [1] A water-in-oil emulsion type topical skin composition containing the following components (A) and (B): (A) Volatile hydrocarbons (B) Irregular amorphous silica [2] The composition according to [1], wherein component (A) is one or more selected from the group consisting of branched alkanes having 8 to 16 carbon atoms and branched esters having 8 to 16 carbon atoms. [3] The composition according to [1] or [2], wherein component (A) is isododecane. [4] The composition according to any one of [1] to [3], wherein the content of component (A) is 0.1% by mass or more and 10% by mass or less. [5] The composition according to any one of [1] to [4], wherein component (B) is amorphous silica that has not been subjected to a hydrophobic treatment. [6] The composition according to any one of [1] to [5], wherein the content of component (B) is 0.1% by mass or more and 10% by mass or less. [7] The mass ratio (A) / (B) of the component (A) to the component (B) is 0.1 to 10. The composition according to any one of [1] to [6]. [Effects of the Invention]

[0008] The water-in-oil emulsion type external skin composition of the present invention is not sticky when applied and is easy to spread. It is also stable over time and temperature. Therefore, the present invention is suitable for use as an external skin preparation. A water-in-oil emulsion type external skin composition is provided. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in detail below. In this specification, the symbol "to" means a range including the numerical values ​​before and after it. The water-in-oil emulsion type external skin composition of the present invention contains (A) a volatile hydrocarbon and (B) irregular amorphous silica.

[0010] (A) Volatile hydrocarbons In the present invention, "volatile hydrocarbons" refer to compounds that fall under the category of "volatile organic compounds (VOCs)" and generally refer to compounds with a boiling point of less than 260°C under atmospheric pressure. Preferred examples of such volatile hydrocarbon oils include alkanes having 8 to 28 carbon atoms which may have a branched chain, esters having 8 to 28 carbon atoms which may have a branched chain, light liquid paraffin, squalane, hydrogenated poly(C6-12)olefins, and hydrogenated polyisobutene. Of these, one or more selected from alkanes having a branched chain of 8 to 16 carbon atoms and esters having a branched chain of 8 to 16 carbon atoms are more preferred. Particularly preferred examples of alkanes having a branched chain of 8 to 16 carbon atoms include isododecane and isohexadecane, and particularly preferred examples of esters having a branched chain of 8 to 16 carbon atoms include isohexyl neopentanoate.

[0011] The content of (A) volatile hydrocarbons in the composition of the present invention is preferably 0.1 to 10 mass %, more preferably 0.2 to 5 mass %, even more preferably 0.3 to 3 mass %, and particularly preferably 0.5 to 2 mass %, of the total composition. By using the composition in such a range, the composition becomes less sticky when applied and is easier to spread, and the composition is more likely to be stable over time and temperature.

[0012] (B) Irregular amorphous silica can be any silica commonly used in cosmetics. The specific surface area of ​​the amorphous silica is preferably 700 m 2 / g, more preferably less than 600m 2 / g or less, more preferably 500m 2 / g or less, and preferably 100m 2 / g or more, more preferably 200m 2 / g or more, more preferably 280m 2 / g or more. Such a specific surface area is determined by a nitrogen absorption method known as the BET (Brunauer-Emmett-Teller) method. The measurement value shall be in accordance with (JIS Z 8830). The average primary particle size of the irregular amorphous silica is preferably 10 nm to 25 μm, more preferably 100 nm to 15 μm, even more preferably 1 to 10 μm, and particularly preferably 2 to 5 μm. Here, the average primary particle size is a value calculated by repeatedly measuring the volume average of 30 particles selected from an arbitrary field of view in a transmission electron microscope photograph. The arithmetic mean of the major and minor axes of the particles is considered to be the particle size.

[0013] The amorphous silica (B) may be hydrophobized or hydrophilized, but is preferably not hydrophobized. That is, it is preferable to use silica that has not been surface-treated or that has been hydrophilized. The hydrophobic treatment is not limited to treatments that are applied to ordinary cosmetic powders, and examples thereof include dry treatments and wet treatments using surface treatment agents such as fluorine compounds, silicone compounds, metal soaps, amino acid compounds, lecithin, alkylsilanes, oils, and organic titanates. Specific examples of surface treatment agents include fluorine compounds such as perfluoropolyethers, perfluoroalkyl phosphate esters, perfluoroalkylalkoxysilanes, and fluorine-modified silicones; silicone compounds such as dimethylpolysiloxanes, methylhydrogenpolysiloxanes, cyclic silicones, organopolysiloxanes modified with trialkoxy groups at one or both ends, crosslinked silicones, silicone resins, fluorine-modified silicone resins, and acrylic-modified silicones; metal soaps such as aluminum stearate, aluminum myristate, zinc stearate, and magnesium stearate; proline, hydroxyproline, and alanine. Examples of suitable organic solvents include: amino acid compounds such as glycine, sarcosine, glutamic acid, aspartic acid, lauroyl lysine, lysine and their derivatives, and acylated amino acids; lecithin, hydrogenated lecithin; alkyl silanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltriethoxysilane, and triethoxycaprylylsilane; oils such as polyisobutylene, waxes, oils and fats, and fatty acids; and organic titanates such as isopropyl triisostearoyl titanate.

[0014] The hydrophilization treatment is not limited to any treatment that is applied to ordinary cosmetic powders. For example, plant-based polymers such as gum arabic, tragacanth, arabinogalactan, locust bean gum (carob gum), guar gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), starch (rice, corn, potato, wheat), algae colloid, tolanthus gum, and locust bean gum; microbial-based polymers such as xanthan gum, dextran, succinoglucan, and pullulan; animal-based polymers such as collagen, casein, albumin, deoxyribonucleic acid (DNA) and salts thereof; starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; methylcellulose, ethylcellulose, methylhydroxypropylcellulose, carboxymethylcellulose, hydroxymethylcellulose, Examples of suitable surface treatment agents include cellulose-based polymers such as hydroxypropyl cellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethyl cellulose, crystalline cellulose, and cellulose powder; alginic acid-based polymers such as sodium alginate and propylene glycol alginate; vinyl-based polymers such as polyvinyl methyl ether, polyvinylpyrrolidone, and carboxyvinyl polymer; polyoxyethylene-based polymers such as polyethylene glycol and polyethylene glycol silane; polyoxyethylene-polyoxypropylene copolymer-based polymers; and acrylic polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylic acid amide. Examples of suitable surface treatment agents include inorganic silicic acid compounds such as silica, and dry treatments and wet treatments.

[0015] The total content of (B) irregular amorphous silica in the composition of the present invention is preferably 0.1 to 10 mass %, more preferably 0.2 to 5 mass %, even more preferably 0.3 to 3 mass %, and particularly preferably 0.5 to 2 mass %, of the total composition. By using it in such a range, the composition becomes less sticky when applied and is easier to spread.

[0016] In the composition of the present invention, the mass ratio (A) / (B) of the content of the volatile hydrocarbon (A) to the content of the amorphous amorphous (B) is preferably 0.1 to 10, more preferably 0.1 to 8, even more preferably 0.2 to 5, and particularly preferably 0.5 to 2.5. By incorporating a combination of these components at such a mass ratio, the composition is less sticky when applied and is easier to spread.

[0017] The composition of the present invention is in the form of a water-in-oil emulsion. In the present invention, the dosage form is not particularly limited as long as the outermost phase is an oil phase, and may be a W / O type, an O / W / O type, a (W1+W2) / O type, or the like.

[0018] The composition of the present invention typically contains an aqueous component and an oily component. The aqueous component may be any component that dissolves in water at 25 to 90°C, and typically also includes a surfactant. The oily component may be any component that undergoes phase separation from water after being suspended in water at 25 to 90°C and left to stand for 1 hour, and examples of such components include oils. In the emulsion composition of the present invention, the mass ratio of the aqueous component to the oily component is not particularly limited, but is preferably 30:70 to 90:10, more preferably 60:40 to 85:15.

[0019] The composition of the present invention is less sticky when applied. It also spreads smoothly on the skin, providing a pleasant feel. Furthermore, it has excellent stability, such as no separation of the emulsion system or discoloration even after storage over time or at different temperatures.

[0020] Therefore, the composition of the present invention can be preferably applied to external skin preparations. The topical skin preparation is preferably in the form of a cosmetic or quasi-drug, and more preferably includes skin care cosmetics, sunscreen cosmetics, and makeup cosmetics. Preferred examples of skin care cosmetics include emulsions, essences, and serums. Sunscreen cosmetics may be for the face or body. Preferred examples of makeup cosmetics include makeup bases, foundations, concealers, BB creams, CC creams, mascaras, eye colors, blushes, eyebrow colors, and the like. Note that eyeliners are excluded from makeup cosmetics.

[0021] The water-in-oil emulsion composition of the present invention can be produced according to a conventional method.

[0022] The composition of the present invention may optionally contain other ingredients commonly used in cosmetics, provided that the effects of the present invention are not impaired. Examples of such optional ingredients include oils other than (A), alcohols, ethers, powders other than (B), humectants, surfactants, sequestering agents, pearlescent agents, amino acids, organic amines, polymer emulsions, pH adjusters, vitamins, antioxidants, preservatives, water-soluble polymers, fragrances, and various active ingredients.

[0023] Other oil agents include silicone oil, polar oil, natural oil, and the like.

[0024] Silicone oils include dimethylpolysiloxane (dimethicone), cyclopentasiloxane, decamethylcyclopentasiloxane, caprylyl methicone, trimethylsiloxysilicate, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, and the like.

[0025] Polar oils include synthetic ester oils such as 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-ethylhexylate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaneerythritol tetra-2-ethylhexylate, glyceryl tri-2-ethylhexanoate, trime triisostearate, Tyrolpropane, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, 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, isononyl isononanoate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, octyl methoxycinnamate, 2-ethylhexyl paramethoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, and the like.

[0026] Examples of natural oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, Japanese kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, sunflower oil, triglycerin, glyceryl trioctanoate, and glyceryl triisopalmitate.

[0027] Examples of alcohols include monohydric alcohols such as cetanol, batyl alcohol, behenyl alcohol, palmitoleic alcohol, heptadecanol, 1-heptadecanol, stearyl alcohol, isostearyl alcohol, elaidyl alcohol, oleyl alcohol, linoleyl alcohol, elaidolinoleyl alcohol, linolenyl alcohol, elaidolinolenyl alcohol, ricinoleyl alcohol, nonadecyl alcohol, arachidyl alcohol, heneicosanol, behenyl alcohol, and erucyl alcohol; ethylene glycol, 1,3-butylene glycol, trimethylene glycol, and 1,2-butylene glycol; Dihydric alcohols such as ethylene glycol, propylene glycol, dipropylene glycol, propanediol, 1,2-pentanediol, 3-methyl-1,3-butanediol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, and octylene glycol; trihydric alcohols such as trimethylolpropane; tetrahydric alcohols such as pentaerythritol; pentahydric alcohols such as xylitol; polyhydric alcohol polymers such as triglycerin, tetraglycerin, and polyglycerin; sugar alcohols such as starch-decomposed sugar-reduced alcohols; and polyglycerin. alcohol alkyl ethers such as 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, and ethylene glycol isopropyl ether; alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl 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, and dipropylene glycol butyl ether; glycerin monoalkyl ethers such as xyl alcohol, selachyl alcohol, and batyl alcohol; Alcohol polymers such as diethylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, and polyethylene glycol; Examples include glycerol; 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, etc.

[0028] In addition to the above alcohols, ethers include: Ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, 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, and the like.

[0029] The powder may be spherical, needle-like, plate-like, or any other suitable shape, 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 other than (B), alumina, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, Hydroxyapatite, ceramic powder, boron nitride, etc.); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, poly(methyl meth)acrylate powder, polystyrene powder, styrene and acrylic acid copolymer resin powder, silicone resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); metal soaps (e.g., zinc myristate, calcium palmitate, aluminum stearate); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide ( red iron oxide, iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments inorganic black pigments (e.g., black iron oxide, low-order titanium dioxide, etc.); inorganic purple pigments (e.g., mango violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); pearl pigments (e.g., titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); zirconium, barium, or aluminum Examples of organic pigments include 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, as well as Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1); natural pigments (e.g., chlorophyll, β-carotene, etc.); and organically modified clay minerals (e.g., organically modified bentonite, organically modified hectorite, etc.).

[0030] Examples of moisturizing agents include chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, and melilot extract.

[0031] Surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

[0032] 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 triethanolamine lauryl sulfate, POE sodium lauryl sulfate, etc.); N-acyl sarcosinates (e.g., sodium lauroyl sarcosinate, etc.); higher fatty acid amide sulfonates (e.g., sodium N-myristoyl-N-methyl taurate, coconut oil fatty acid Sodium methyl tauride, sodium lauryl methyl tauride, etc.; phosphate ester salts (sodium POE oleyl ether phosphate, sodium POE stearyl ether phosphate, etc.); sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol sulfosuccinate, etc.); alkylbenzene sulfonates (e.g., sodium linear dodecyl benzene sulfonate, triethanolamine linear dodecyl benzene sulfonate, linear dodecyl benzene sulfonic acid, etc.); higher fatty acid ester sulfate ester salts (e.g., hard sodium hydroxylated coconut oil fatty acid glycerin sulfate, etc.); N-acyl glutamates (e.g., monosodium N-lauroyl glutamate, disodium N-stearoyl glutamate, monosodium N-myristoyl-L-glutamate, etc.); sulfated oils (e.g., turmeric oil, etc.); POE alkyl ether carboxylic acids; POE alkyl allyl ether carboxylates; α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkylolamide sulfates; sodium lauroyl monoethanolamide succinate; N-palmitoyl aspartic acid ditriethanolamine; sodium caseinate, etc.

[0033] 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; Alkyl quaternary ammonium salts; Alkyl dimethyl benzoates Examples of the alkylamine salt include benzylammonium salts; alkylisoquinolinium salts; dialkylmorphonium salts; POE alkylamines; alkylamine salts; polyamine fatty acid derivatives; amyl alcohol fatty acid derivatives; benzalkonium chloride; and benzethonium chloride.

[0034] 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.).

[0035] Examples of nonionic surfactants include polyether-modified silicones (e.g., polyethylene glycol-10 dimethicone, polyethylene glycol-12 dimethicone, etc.); polyglycerin-modified silicones (e.g., polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, etc.); sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monostearate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, penta-2- diglycerol sorbitan ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, etc.); glycerin fatty acids (e.g., glyceryl monocottonseed oil fatty acid, glyceryl monoerucate, glyceryl sesquioleate, glyceryl monostearate, glyceryl α,α'-oleate pyroglutamate, glyceryl (monostearate / malate), etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); POE castor oil / hydrogenated castor oil derivatives (POE castor oil, POE hydrogenated castor oil, etc.); non-hydrophilic nonionic surfactants such as glycerin alkyl ethers. Also, polyglycerin fatty acid esters (e.g., polyglyceryl monooleate, polyglyceryl monostearate, etc.); POE sorbitan fatty acid esters (e.g., POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan tetraoleate, etc.); POE sorbitan fatty acid esters (e.g., POE sorbitan POE monolaurate, POE sorbitol monooleate, POE sorbitol pentaoleate, POE sorbitol monostearate, etc.); POE glycerin fatty acid esters (e.g., POE monooleates such as POE glycerin monostearate, POE glycerin monoisostearate, POE glycerin 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 oleate, etc.); ether, POE stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, POE cholestanol ether, etc.); POE alkyl phenyl ethers (for example, POE nonylphenyl ether, etc.); Pluronic types (for example, Pluronic (registered trademark), etc.); POE·POP alkyl ethers (for example, POE·POP cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP monobutyl ether, POE·POP hydrogenated lanolin, POE·POP glycerin ether, etc.); tetraPOE·tetraPOP ethylenediamine condensates (for example, , Tetronic, etc.); POE castor oil hydrogenated castor oil derivatives (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 (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; alkyl glucosides; alkylethoxydimethylamine oxide; and hydrophilic nonionic surfactants such as trioleyl phosphate.

[0036] 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.

[0037] Examples of pearlescent agents include glycol distearate and titanium mica.

[0038] Examples of the amino acid include neutral amino acids (e.g., threonine, cysteine, etc.); basic amino acids (e.g., hydroxylysine, etc.); and the amino acid derivatives include, for example, acyl sarcosine sodium (sodium lauroyl sarcosine), acyl sarcosine sodium (sodium lauroyl sarcosine), Examples of the anti-inflammatory agent include glutamic acid salts, acyl β-alanine sodium, glutathione, and pyrrolidone carboxylic acid.

[0039] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0040] 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.

[0041] Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate, and are usually used to adjust the pH of the internal phase (aqueous component).

[0042] Vitamins include, for example, vitamins A, B1, B2, B6, C, E and their derivatives. , pantothenic acid and its derivatives, biotin, etc.

[0043] Examples of antioxidants include tocopherols, dibutylhydroxytoluene (BHT), butylhydroxyanisole, pyrosulfite, gallic acid ester, phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0044] Examples of preservatives include parabens and phenoxyethanol.

[0045] Examples of water-soluble polymers include plant-based polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (marmelo), algae colloid (cassow extract), starch (coconut oil), and the like. (corn, potato, wheat), glycyrrhizic acid); microbial polymers (e.g. natural water-soluble polymers such as xanthan gum, dextran, succinoglucan, pullulan, etc.; animal polymers (e.g., collagen, casein, albumin, gelatin, etc.); semi-synthetic water-soluble polymers such as starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, ethylcellulose, hydroxypropylmethylcellulose stearoxy ether, sodium cellulose sulfate, carboxymethylcellulose, sodium carboxymethylcellulose, crystalline cellulose, cellulose powder, etc.); alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.), etc. Examples include synthetic water-soluble polymers such as 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.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); polyethyleneimine; and cationic polymers.

[0046] Examples of various active ingredients include anti-inflammatory agents (e.g., salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); whitening agents (e.g., placenta extract, saxifrage extract, arbutin, resorcinol derivatives, etc.); various extracts (e.g., Phellodendron bark, Coptis chinensis, Lithospermum root, Peony, Swertia japonica, Birch, sage, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Job's tears, Luffa, Lily, Saffron, Cnidium rhizome, Angelica acutiloba, Garlic, Chili pepper, Citrus fruit, Angelica acutiloba, Seaweed, etc.), activators (e.g., Royal jelly, Photosensitizer, Cholesterol derivative, etc.), conductors, 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, glycyrrhetinic acid derivatives, etc.), etc. [Example]

[0047] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples as long as it does not depart from the gist of the invention.

[0048] <Production example and evaluation> Using the formulation components shown in Table 1, the oil phase components and the aqueous phase components were each heated to 70°C to dissolve, the aqueous phase was added to the oil phase components, and the mixture was emulsified while stirring with a homomixer to prepare a water-in-oil emulsion composition. The resulting compositions were evaluated according to the following criteria, and the results are shown in Table 1.

[0049] (Stability over time) Each composition was left standing at 50°C for 30 days, after which 10 expert evaluators visually inspected the composition for separation and discoloration, rating them on a 5-point scale as shown below, and the total of the scores given by the 10 evaluators was used as the evaluation result. 5: No separation or discoloration occurs 4: Almost no separation or discoloration 3: Slight separation and discoloration have occurred, but this does not affect use. 2: Separation and discoloration have occurred 1: Severe separation and discoloration

[0050] (non-sticky) Ten expert evaluators each applied the composition to the skin and evaluated the stickiness of the skin during application on the following five-point scale, and the total of the scores from the 10 experts was used as the evaluation result. 5: No sticky feeling during application 4: Almost no stickiness during application 3: Feels slightly sticky during application 2: Feels sticky during application 1: I feel a strong stickiness during application

[0051] (Ease of stretching) Ten expert evaluators each applied the composition to the skin and evaluated the spread on the skin during application using the following five-point scale, and the total of the scores from the 10 experts was used as the evaluation result. 5: Very good 4: Good 3: Fairly good 2: Somewhat bad 1: Very bad

[0052] [Table 1]

Claims

1. A water-in-oil emulsion type topical skin composition containing the following components (A) and (B): (A) Isododecane and / or isohexyl neopentanoate (B) Irregular amorphous silica

2. The composition according to claim 1, wherein the content of component (A) is 0.1% by mass or more and 10% by mass or less.

3. 3. The composition according to claim 1, wherein component (B) is amorphous silica that has not been hydrophobized.

4. The composition according to any one of claims 1 to 3, wherein the content of component (B) is 0.1% by mass or more and 10% by mass or less.

5. The composition according to any one of claims 1 to 4, wherein the mass ratio (A) / (B) of component (A) to component (B) is 0.1 to 10.

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