Water-in-oil sunscreen cosmetic composition

Abstract

[Problem] To provide a water-in-oil sunscreen cosmetic composition which allows for reduction in the amount of volatile silicone oil used and exhibits excellent water resistance and UV protection efficacy. [Solution] The water-in-oil sunscreen cosmetic composition comprises (A) a hydrocarbon oil or an ester oil; (B) at least one selected from the group consisting of an amino acid-based gelling agent, a wax, a fatty acid solid at room temperature (25°C) or a salt thereof, a glyceryl fatty acid ester, and an organically modified clay mineral; and (C) an ultraviolet absorber.

Description

Water-in-oil sunscreen cosmetics

[0001] The present invention relates to a water-in-oil sunscreen cosmetic.

[0002] Volatile silicone oils are used in water-in-oil sunscreen cosmetics because of their ease of use (see, for example, Patent Document 1). However, silicone oils are generally difficult to decompose and tend to accumulate in the environment. Therefore, for environmental protection, there is a demand for water-in-oil sunscreen cosmetics that do not use volatile silicone oils or that use reduced amounts of volatile silicone oils.

[0003] JP 2015-117236 A

[0004] The present inventors have discovered that a water-in-oil sunscreen cosmetic comprising (A) a hydrocarbon oil or ester oil, (B) at least one selected from the group consisting of an amino acid gelling agent, waxes, fatty acids or salts thereof that are solid at room temperature (25°C), glyceryl fatty acid esters, and organically modified clay minerals, and (C) an ultraviolet absorber, can achieve good water resistance and ultraviolet protection while using less volatile silicone oil than in general cosmetics. The present invention is based on these findings.

[0005] The present invention provides the following inventions. [1] A water-in-oil sunscreen cosmetic comprising (A) a hydrocarbon oil or ester oil, (B) at least one selected from the group consisting of an amino acid-based gelling agent, waxes, a fatty acid or a salt thereof that is solid at room temperature (25°C), a glyceryl fatty acid ester, and an organically modified clay mineral, (C) an ultraviolet absorber, and (D) water, wherein the content of volatile silicone oil is 1% by mass or less, and the content of component (C) is 3% by mass or more based on the total mass of the cosmetic. [2] The water-in-oil sunscreen cosmetic according to [1], comprising, as component (B), (b-1) an organically modified clay mineral, and (b-2) at least one selected from the group consisting of an amino acid-based gelling agent, waxes, a fatty acid or a salt thereof that is solid at room temperature (25°C), and a glyceryl fatty acid ester. [3] The water-in-oil sunscreen cosmetic according to [1] or [2], wherein the organically modified clay mineral is at least one selected from the group consisting of dimethyl distearyl ammonium hectorite, dimethyl alkyl ammonium hectorite, benzyl dimethyl stearyl ammonium hectorite, and distearyl dimethyl ammonium chloride-treated magnesium aluminum silicate. [4] The water-in-oil sunscreen cosmetic according to [2], wherein the component (b-2) is at least one selected from the group consisting of polyamide-8, dibutyl lauroyl glutamide, candelilla wax, microcrystalline wax, hydroxystearic acid, palmitic acid, and glyceryl behenate / eicosanedioate. [5] The water-in-oil sunscreen cosmetic according to any one of [1] to [4], wherein the component (A) is at least one selected from the group consisting of (C9-12) alkanes, (C13,C14) alkanes, (C13-15) alkanes, undecane, tridecane, hydrogenated polyisobutene, hydrogenated didecene, and coconut alkyl caprylate / caprate. [6] The cosmetic according to any one of [1] to [5], wherein the content of the component (A) is 5 to 80% by mass, the content of the component (B) is 0.1 to 10% by mass, and the content of the component (C) is 3 to 30% by mass, based on the total mass of the cosmetic. [7] The cosmetic according to [2], wherein the content of the component (b-2) is 0.01 to 5% by mass, based on the total mass of the cosmetic.[8] The water-in-oil sunscreen cosmetic according to [2], wherein the ratio (b-2) / (b-1), of the content of component (b-2) to the content of component (b-1), is 0.2 to 10. [9] The cosmetic according to any one of [1] to [8], wherein the viscosity measured at 30°C using a Brookfield type rotational viscometer is 12,000 mPa s or less.

[0006] According to the present invention, it is possible to provide a water-in-oil sunscreen cosmetic that has good water resistance and UV protection effect despite having a low content of volatile silicone oil. Specific Description of the Invention

[0007] The water-in-oil sunscreen cosmetic of the present invention (hereinafter sometimes referred to as the cosmetic) comprises (A) a hydrocarbon oil or ester oil, (B) at least one selected from the group consisting of an amino acid gelling agent, waxes, fatty acids or salts thereof that are solid at room temperature (25°C), glyceryl fatty acid esters, and organically modified clay minerals, and (C) an ultraviolet absorber, wherein the content of volatile silicone oil is 1% by mass or less, and the content of component (C) is 3% by mass or more based on the total mass of the cosmetic. Each of these components, as well as further components that can be blended, will be described below.

[0008] (A) Hydrocarbon Oil or Ester Oil The cosmetic preparation according to the present invention comprises (A) a hydrocarbon oil or ester oil. Examples of hydrocarbon oils include alkanes having 9 to 15 carbon atoms, isododecane, isohexadecane, isoparaffin, mineral oil (liquid paraffin), squalane, pristane, squalene, hydrogenated polyisobutene, hydrogenated didecene, and hydrogenated polydecene. Hydrocarbon oils classified as waxes, which are one of the components (B) described below, are excluded from component (A).

[0009] Examples of ester oils include coconut (caprylic / capric acid), octyl octanoate, nonyl nonanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, and isostearic acid Isocetyl, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, tripropylene glycol pivalate, diisostearyl malate, glyceryl di-2-heptylundecanoate, glyceryl diisostearate, trimethylolpropane tri-2-ethylhexanoate, trimethylol triisostearate Propane, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate-2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecanoic acid palmitate undecyl, diisobutyl adipate, N-lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, cetyl ethylhexanoate, macadamia nut fatty acid phytosteryl, and the like.

[0010] The component (A) is preferably at least one selected from the group consisting of a (C9-12) alkane, a (C13,C14) alkane, a (C13-15) alkane, undecane, tridecane, hydrogenated polyisobutene, hydrogenated didecene, and coco-caprylate / coco-caprate, and is particularly preferably at least one selected from the group consisting of a (C9-12) alkane, undecane, tridecane, hydrogenated polyisobutene, hydrogenated didecene, and coco-caprylate / coco-caprate.

[0011] The component (A) may be blended in one or more types. The content of the component (A) is preferably 5 to 80% by mass, more preferably 5 to 50% by mass, relative to the total mass of the cosmetic.

[0012] The cosmetic preparation according to the present invention comprises (B) at least one component selected from the group consisting of amino acid gelling agents, waxes, fatty acids or salts thereof that are solid at room temperature (25°C), glyceryl fatty acid esters, and organically modified clay minerals. In the present invention, these are classified into (b-1) organically modified clay minerals, and (b-2) amino acid gelling agents, waxes, fatty acids or salts thereof that are solid at room temperature (25°C), and glyceryl fatty acid esters.

[0013] Examples of the (b-1) component organically modified clay mineral include clay minerals that are a type of colloidal hydrous aluminum silicate having a three-layer structure and are modified with a quaternary ammonium salt-type cationic surfactant. Specifically, they can be obtained by treating clay minerals such as natural or synthetic montmorillonites such as montmorillonite, saponite, and hectorite (such as Veegum (trade name, manufactured by Vanderbilt), Kunipia (trade name, manufactured by Kunimine Industries Co., Ltd.), and Laponite (trade name, manufactured by BYK Japan KK)), and synthetic micas known as sodium silicic mica and sodium or lithium taeniolite (such as Dimonite (trade name, manufactured by Topy Industries Co., Ltd.)) with a quaternary ammonium salt-type cationic surfactant.

[0014] Examples of quaternary ammonium salt type cationic surfactants include dodecyltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, arachidyltrimethylammonium chloride, behenyltrimethylammonium chloride, myristyldimethylethylammonium chloride, cetyldimethylethylammonium chloride, stearyldimethylethylammonium chloride, arachidyldimethylethylammonium chloride, behenyldimethylethylammonium chloride, myristyldiethylmethylammonium chloride, cetyldiethylmethylammonium chloride, ammonium chloride, stearyl diethylmethyl ammonium chloride, arachyl diethylmethyl ammonium chloride, behenyl diethylmethyl ammonium chloride, benzyl dimethyl myristyl ammonium chloride, benzyl dimethyl cetyl ammonium chloride, benzyl dimethyl stearyl ammonium chloride, benzyl dimethyl behenyl ammonium chloride, benzyl methyl ethyl cetyl ammonium chloride, benzyl methyl ethyl stearyl ammonium chloride, dibehenyl dihydroxyethyl ammonium chloride, and the corresponding bromides, as well as dipalmityl propyl ethyl ammonium methyl sulfate, etc. In carrying out the present invention, one or more of these may be arbitrarily selected.

[0015] As component (b-1), it is preferable to use organically modified hectorite, and it is preferably at least one selected from the group consisting of dimethyl distearammonium hectorite, dimethyl alkyl ammonium hectorite, benzyl dimethyl stearyl ammonium hectorite, and distearyl dimethyl ammonium chloride-treated magnesium aluminum silicate. Dimethyl distearyl ammonium hectorite is particularly preferable.

[0016] As the amino acid gelling agent (b-2), dibutyl lauroyl glutamide, dibutyl ethyl hexanoyl glutamide, polyamide-8, polyamide-3, N-lauroyl-L-glutamic acid dibutylamide, etc. Among these, it is preferable to use polyamide-8 or dibutyl lauroyl glutamide.

[0017] Examples of waxes that can be used include paraffin wax, microcrystalline wax, ceresin wax, carnauba wax, candelilla wax, sunflower seed wax, beeswax, cotton wax, bayberry wax, privet wax, spermaceti wax, montan wax, rice wax, kapok wax, Japan wax, lanolin acetate, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, beeswax, POE (polyoxyethylene) lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, fatty acid glyceride, hydrogenated castor oil, petrolatum, and POE hydrogenated lanolin alcohol ether. Of these, candelilla wax or microcrystalline wax is preferably used.

[0018] Examples of fatty acids or salts thereof that are solid at room temperature (25°C) include myristic acid, palmitic acid, stearic acid, behenic acid, and hydroxystearic acid. Examples of fatty acid salts that can be used include calcium salts, magnesium salts, and aluminum salts of these acids. Here, "solid at room temperature (25°C)" means that the acid can maintain its solid state at room temperature. Of these, it is preferable to use hydroxystearic acid or palmitic acid.

[0019] Glyceryl fatty acid esters are esterification reaction products obtained by reacting glycerin, a dibasic acid having 18 to 28 carbon atoms, and a fatty acid having 8 to 28 carbon atoms (excluding dibasic acids), and any glyceryl fatty acid commonly used in cosmetics can be used without particular limitation. Specific examples include glyceryl (behenate / isostearate / eicosadioate), glyceryl (behenate / eicosadioate), and polyglyceryl-10 (behenate / eicosadioate). Of these, it is preferable to use glyceryl (behenate / eicosadioate).

[0020] It is more preferable that component (B) contains both (b-1) an organically modified clay mineral and (b-2) at least one selected from the group consisting of an amino acid gelling agent, waxes, fatty acids or salts thereof that are solid at room temperature (25° C.), and glyceryl fatty acid esters. Furthermore, it is preferable that component (b-2) is at least one selected from the group consisting of polyamide-8, dibutyl lauroyl glutamide, candelilla wax, microcrystalline wax, hydroxystearic acid, palmitic acid, and glyceryl (behenate / eicosanedioate).

[0021] The blending amount of component (B) is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, relative to the total mass of the cosmetic.

[0022] Furthermore, when component (B) contains component (b-1) and component (b-2), the content of component (b-1) is preferably 0.05 to 3 mass%, and more preferably 0.1 to 1 mass%, based on the total mass of the cosmetic. Furthermore, the content of component (b-2) is preferably 0.01 to 5 mass%, and more preferably 0.05 to 4 mass%, and particularly preferably 0.1 to 3 mass%, based on the total mass of the cosmetic. Furthermore, the ratio of the content of component (b-2) to the content of component (b-1), (b-2) / (b-1), is preferably 0.2 to 10, and particularly preferably 0.3 to 8.

[0023] (C) Ultraviolet Absorbers Examples of ultraviolet absorbers include benzoic acid derivatives such as ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA, PEG-25-PABA, and diethylaminohydroxybenzoylhexyl benzoate; salicylic acid derivatives such as homosalate, ethylhexyl salicylate (octyl salicylate), dipropylene glycol salicylate, and TEA salicylate; cinnamic acid derivatives such as octyl methoxycinnamate, ethylhexyl methoxycinnamate, isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinnoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate; Dibenzoylmethane derivatives such as 4-tert-butyl-4'-methoxydibenzoylmethane; β,β-diphenylacrylate derivatives such as octocrylene; benzophenone derivatives such as benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, and benzophenone-12; benzylidene camphor derivatives such as 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid, benzalkonium camphor methosulfate, terephthalidene discamphorsulfonic acid, and polyacrylamidomethyl benzylidene camphor; phenylbenzimidazole derivatives such as phenylbenzimidazole sulfonic acid and disodium phenyldibenzimidazole tetrasulfonate; triazine derivatives such as bisethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone (for example, "Uvinal T150"; BASF), diethylhexylbutamido triazone, 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine, and 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine;Examples of suitable benzotriazole derivatives include phenylbenzotriazole derivatives such as drometrizole trisiloxane and methylene bis(benzotriazolyltetramethylbutylphenol); anthranil derivatives such as menthyl anthranilate; imidazoline derivatives such as ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate; benzalmalonate derivatives such as polyorganosiloxanes having benzalmalonate functional groups; and 4,4-diarylbutadiene derivatives such as 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene. Of these, bisethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, ethylhexyl salicylate, and octocrylene are preferred. It is also preferred that the benzotriazole derivatives do not contain octyl methoxycinnamate.

[0024] Furthermore, the component (C) is contained in an amount of 3% by mass or more, and preferably 3 to 30% by mass, based on the total mass of the cosmetic.

[0025] (D) Water The cosmetic according to the present invention comprises (D) water. As the water, water used in cosmetics, quasi-drugs, etc. can be used, such as purified water, ion-exchanged water, tap water, etc. The blending amount of water is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, based on the total mass of the cosmetic according to the present invention.

[0026] The cosmetic according to the present invention does not contain volatile silicone oil (content is 0% by mass), or the content of volatile silicone oil is 1% by mass or less based on the total mass of the cosmetic. Here, volatile silicone oil refers to a silicone oil that is volatile at room temperature (25°C) and normal pressure (1 atmosphere, 1013.25 hPa). Examples of volatile silicone oil include chain silicone oils such as dimethicone (1.5 cs, 2 cs) and trisiloxane (1 cs), and cyclic silicone oils such as cyclomethicone. The content of volatile silicone oil is preferably 0.1% by mass or less, more preferably 0.01% by mass or less, based on the total mass of the cosmetic.

[0027] The viscosity of the cosmetic according to the present invention, measured at 30° C. using a Brookfield type rotational viscometer, is 12,000 mPa·s or less, and preferably 10 to 12,000 mPa·s. By achieving such a viscosity, the cosmetic can be easily spread, improving the usability of the cosmetic.

[0028] The water-in-oil sunscreen cosmetic of the present invention allows for a reduced amount of volatile silicone oil to be used, while still providing water resistance and UV protection effects that are equivalent to or even better than those achieved when volatile silicone oil is used.

[0029] In addition to the above components, the cosmetic according to the present invention may further contain components commonly used in cosmetics and pharmaceuticals, such as powder components, oils other than components (A) and (C), moisturizers, pH adjusters, surfactants, preservatives, chelating agents, stabilizers, colorants, fragrances, thickeners, etc. These additives may be blended as appropriate depending on the formulation of the cosmetic.

[0030] The powder component in the present invention can be arbitrarily selected from powder components generally used in cosmetics. Examples of such powder components include inorganic powders (e.g., titanium oxide, silica, talc, kaolin, sericite, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, zeolite, boron nitride, ceramic powder, iron oxide, and sericite); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, and cellulose powder); inorganic white pigments (e.g., zinc oxide); inorganic red pigments (e.g., iron titanate); inorganic purple pigments (e.g., mango violet and cobalt violet); and inorganic green pigments (e.g., chromium oxide, chromium hydroxide, and cobalt titanate). Examples of the pigment include inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); and metal powder pigments. Pearl pigments such as titanium oxide-coated mica (titanium mica), titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, muscovite, synthetic mica, phlogopite, lepidolite, biotite, lepidolite, bismuth oxychloride, and fish scale leaf can also be used. The blending amount of the powder component in the cosmetic according to the present invention is preferably 20% by mass or less, based on the total amount of the cosmetic.

[0031] Examples of oil components other than components (A) and (C) include ester oils and silicone oils other than volatile silicone oils.

[0032] Any conventionally known moisturizing agent can be used as the moisturizing agent, and examples of such moisturizing agents include polyhydric alcohols and glycol ethers, more specifically, ethylene glycol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, hexamethylene glycol, isoprene glycol, polyethylene glycol, hyaluronic acid, xylitol, sorbitol, maltitol, and diglycerin (EO)PO adducts.

[0033] Examples of pH adjusters include commonly used acids or alkalis such as hydrochloric acid and sodium hydroxide.

[0034] The surfactant can be selected from any conventionally known surfactants, and may be any of a nonionic surfactant, a cationic surfactant, an anionic surfactant, an amphoteric surfactant, etc.

[0035] Examples of preservatives include phenoxyethanol, chlorphenesin, benzoic acid, salicylic acid, sorbic acid, alkyl parahydroxybenzoate, hexachlorophene, ε-polylysine, and the like.

[0036] Chelating agents are used to sequester metal ions in cosmetics, and examples thereof include sodium hexametaphosphate and sodium salt of ethylenediaminetetraacetic acid.

[0037] The stabilizer is selected depending on the ingredients to be blended, and for example, sodium pyrosulfite can be used.

[0038] The cosmetic composition according to the present invention can be used as a cosmetic composition that is required to have a sunscreen effect, such as a sunscreen lotion, a skin care lotion, a makeup base, etc. The cosmetic composition according to the present invention can be produced according to a conventional method.

[0039] The present invention will be described in detail based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amounts are expressed in mass % based on the total mass.

[0040] [Examples 1 to 16 and Comparative Examples 1 to 8] Water-in-oil sunscreen cosmetics were prepared according to the formulations shown in Tables 1 to 5 for Examples 1 to 16 and Comparative Examples 1 to 8. The values ​​in the tables indicate mass %. Note that Comparative Example 6 in Tables 3 to 5 is the same.

[0041] Furthermore, the performance of these cosmetics was evaluated as follows, and the evaluation results are shown in Tables 1 to 5.

[0042] [Integrated absorbance value] The integrated absorbance value was calculated by the following procedure. If the integrated absorbance value is 120 or more, the cosmetic product is sufficiently effective as a sunscreen. First, a measurement sample was applied to a plate (S plate) (5 cm x 5 cm V-grooved PMMA plate, SPF MASTER (registered trademark) PA01, manufactured by Shiseido Co., Ltd.) at a concentration of 2 mg / cm. ２ The plate was then applied with a finger for 60 seconds and allowed to dry for 15 minutes. The absorbance of the plate to which the measurement sample had been added was measured at 280 nm to 400 nm using a spectrophotometer (U-3500 model self-recording spectrophotometer, manufactured by Hitachi, Ltd.). The absorbance (Abs) at 280 nm to 400 nm was integrated to calculate the integrated absorbance value.

[0043] [Integrated Value After Water Bath] After measuring the absorbance to obtain the integrated absorbance value, the plate was thoroughly immersed in water with a hardness of 50 to 500 and stirred in water for 30 minutes at 300 rpm using a Three-One motor. The plate was then dried at room temperature (25°C ± 5°C) for approximately 15 to 30 minutes until all water droplets on the plate surface disappeared, and the absorbance was measured again. The absorbance (Abs) at 280 nm to 400 nm was integrated to calculate the integrated value after the water bath.

[0044] [Water Resistance Evaluation] Using the integrated absorbance value and the integrated absorbance value after water bath obtained by the above procedure, the rate of change in absorbance (Abs) before and after water bathing was calculated based on the following formula (1). A higher value of the rate of change in absorbance indicates that the measurement sample has not flowed into the water, and therefore was evaluated as having higher water resistance. <Formula (1)> Rate of change in absorbance before and after water bathing (%) = (integrated absorbance value after water bathing) / (integrated absorbance value before water bathing) × 100

[0045] [Water Resistance Evaluation (Rank)] The rate of change in absorbance before and after bathing in water obtained in the water resistance evaluation above was ranked according to the following criteria. C or higher was evaluated as having sufficient water resistance. S: Rate of change in absorbance is 85% or more A: Rate of change in absorbance is 80% or more but less than 85% B: Rate of change in absorbance is 76% or more but less than 80% C: Rate of change in absorbance is 70% or more but less than 75% D: Rate of change in absorbance is less than 70%

[0046] [Absorbance Evaluation] Using the integrated absorbance values ​​of the Examples and the Comparative Examples, the absorbance ratio was calculated based on the following formula (2). The absorbance ratio was rounded to two decimal places. The comparative examples used for comparison in each Example are listed in Tables 1 to 5. <Formula (2)> Absorbance evaluation = (integrated absorbance value of Example) / (integrated absorbance value of comparative example)

[0047] [Absorbance Evaluation (Rank)] The absorbance evaluation values ​​obtained above were ranked according to the following criteria. B or higher was evaluated as having sufficient absorbance. S: Absorbance evaluation of 1.10 or higher A: Absorbance evaluation of 1.05 or higher but less than 1.10 B: Absorbance evaluation of 0.95 or higher but less than 1.05 C: Absorbance evaluation of 0.90 or higher but less than 0.95 D: Absorbance evaluation of less than 0.90

Claims

1. A water-in-oil sunscreen cosmetic comprising: (A) a hydrocarbon oil or ester oil; (B) at least one member selected from the group consisting of an amino acid gelling agent, waxes, a fatty acid or its salt that is solid at room temperature (25°C), a glyceryl fatty acid ester, and an organically modified clay mineral; (C) an ultraviolet absorber; and (D) water; wherein the content of volatile silicone oil is 1% by mass or less; and the content of component (C) is 3% by mass or more based on the total mass of the cosmetic.

2. The water-in-oil sunscreen cosmetic according to claim 1, comprising, as component (B), (b-1) an organically modified clay mineral, and (b-2) at least one member selected from the group consisting of amino acid gelling agents, waxes, fatty acids or salts thereof that are solid at room temperature (25°C), and glyceryl fatty acid esters.

3. The water-in-oil sunscreen cosmetic according to claim 1 or 2, wherein the organically modified clay mineral is at least one selected from the group consisting of dimethyl distearyl ammonium hectorite, dimethyl alkyl ammonium hectorite, benzyl dimethyl stearyl ammonium hectorite, and distearyl dimethyl ammonium chloride-treated magnesium aluminum silicate.

4. The water-in-oil sunscreen cosmetic according to claim 2, wherein component (b-2) is at least one selected from the group consisting of polyamide-8, dibutyl lauroyl glutamide, candelilla wax, microcrystalline wax, hydroxystearic acid, palmitic acid, and glyceryl behenate / eicosanedioate.

5. The water-in-oil sunscreen cosmetic according to claim 1 or 2, wherein component (A) is at least one selected from the group consisting of (C9-12)alkane, (C13, C14)alkane, (C13-15)alkane, undecane, tridecane, hydrogenated polyisobutene, hydrogenated didecene, and coconut caprylate / caprate.

6. The cosmetic according to claim 1 or 2, wherein, based on the total mass of the cosmetic, the content of component (A) is 5 to 80 mass%, the content of component (B) is 0.1 to 10 mass%, and the content of component (C) is 3 to 30 mass%.

7. The cosmetic according to claim 2, wherein the content of component (b-2) is 0.01 to 5% by mass, based on the total mass of the cosmetic.

8. The water-in-oil sunscreen cosmetic according to claim 2, wherein the ratio (b-2) / (b-1) of the content of component (b-2) to the content of component (b-1) is 0.2 to 10.

9. The cosmetic preparation according to claim 1 or 2, which has a viscosity of 12,000 mPa·s or less as measured at 30°C using a B-type rotational viscometer.

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