Water-in-oil emulsified cosmetic

Abstract

To provide a water-in-oil emulsified cosmetic having a superior ultraviolet protection effect, stability, and usability.SOLUTION: A water-in-oil emulsified cosmetic comprises (A) an oil-soluble acrylic ester-based homopolymer, (B) an organic ultraviolet absorber, and (C) a phenyl-modified silicone oil.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Conventionally, in order to protect the skin from the adverse effects of ultraviolet rays, various cosmetics containing ultraviolet absorbers have been developed. However, when a large amount of ultraviolet absorber is blended, there is a problem that the feeling of use is impaired due to precipitation, stickiness, and irritation of the ultraviolet absorber. An oil-based liquid skin cosmetic that exhibits a high SPF value and has an excellent feeling of use has been developed (Patent Document 1). However, there is a problem with the dissolution stability of the ultraviolet absorber. In addition, there is still room for improvement in terms of the SPF value and the feeling of use.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a water-in-oil emulsion cosmetic having a high ultraviolet protection effect, excellent stability, and excellent feeling of use.

Means for Solving the Problems

[0005] Provided is a water-in-oil emulsion cosmetic containing the following (A) to (C). (A) Oil-soluble acrylate-based homopolymer (B) Organic ultraviolet absorber (C) Phenyl-modified silicone oil

Effects of the Invention

[0006] The water-in-oil type emulsified cosmetic of the present invention exhibits effects such as high ultraviolet ray protection effect, excellent stability, and good usability.

Mode for Carrying Out the Invention

[0007] Hereinafter, a mode for carrying out the present invention will be described.

[0008] [Oil-soluble acrylate-based homopolymer] The (A) oil-soluble acrylate-based homopolymer used in the present invention means an oil-soluble polymer composed of one or more repetitions of structural units derived from acrylate. As the residue of the fatty acid in the acrylate, a linear or branched saturated fatty acid residue is preferable. Further, from the viewpoints of ultraviolet ray protection effect and stability, the number of carbon atoms of the fatty acid residue is preferably 8 to 32, more preferably 10 to 30. As the acrylate, an alkyl acrylate is preferable. For example, decyl acrylate, isodecyl acrylate, lauryl acrylate, stearyl acrylate, isostearyl acrylate, behenyl acrylate, etc. can be mentioned. Among these, from the viewpoints of ultraviolet ray protection effect and stability, it is preferable to use stearyl acrylate and behenyl acrylate.

[0009] Examples of commercially available products of the oil-soluble acrylate-based homopolymer include "TEGO SP 13-1" (stearyl-modified acrylate homopolymer), "TEGO SP 13-6" (behenyl-modified acrylate homopolymer), and "TEGO SP 13 SUNUP" (both stearyl and behenyl-modified acrylate homopolymer) (manufactured by Evonik Corporation), etc.

[0010] Note that the oil-soluble acrylate-based homopolymer may be used alone as one kind or in combination of two or more kinds.

[0011] The oil-soluble acrylic ester homopolymer (A) used in the present invention is preferably blended in an amount of 0.01 to 3 mass% based on the total amount of the water-in-oil emulsion cosmetic, and more preferably 0.05 to 3 mass%. If the blending amount is less than 0.01 mass%, problems with emulsion stability may occur.

[0012] [Organic UV absorbers] The organic ultraviolet absorber (B) used in the present invention is not particularly limited, and can be a known organic ultraviolet absorber.As the organic ultraviolet absorber, for example, ethylhexyl methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, octyl salicylate, polysilicone-15, t-butyl methoxydibenzoylmethane, oxybenzone, methylene bisbenzotriazolyl tetramethyl butyl phenol, bisethylhexyloxyphenol methoxyphenyl triazine and octocrylene are exemplified, and one or more selected from these can be used.

[0013] From the viewpoint of ultraviolet absorbing ability and safety to the skin, it is preferable to use ethylhexyl methoxycinnamate. In addition, in order to provide UVA protection function, it is preferable to use diethylamino hydroxybenzoyl hexyl benzoate and ethylhexyl methoxycinnamate in combination, and it is also preferable to use bisethylhexyloxyphenol methoxyphenyl triazine in combination.

[0014] The organic ultraviolet absorber (B) used in the present invention is preferably blended in an amount of 1 to 30% by mass, and more preferably 3 to 30% by mass, based on the total amount of the water-in-oil emulsion cosmetic. If it is blended in an amount of less than 1% by mass, the ultraviolet protection effect may not be sufficient. On the other hand, if it is blended in an amount of more than 30% by mass, it may cause stickiness or primary irritation to the skin.

[0015] [Phenyl-modified silicone oil] The (C) phenyl-modified silicone oil used in the present invention is a compound in which at least a part of the side chain of a silicone oil having a siloxane bond is substituted with a phenyl group. The (C) phenyl-modified silicone oil used in the present invention is not particularly limited, and known phenyl-modified silicones can be used. For example, one or more of diphenyldimethylsilicone, phenylpropyldimethylsiloxysilicic acid, bisphenylpropyldimethylsilicone, phenyltrimethicone, trimethylpentaphenyltrisiloxane, diphenylsiloxyphenyltrimethicone, trimethylsiloxyphenyldimethylsilicone, etc. can be used in combination. Among these, from the viewpoint of stability, it is preferable to use diphenylsiloxyphenyltrimethicone.

[0016] The blending amount of the phenyl-modified silicone oil is preferably 0.5 to 30% by mass, more preferably 0.5 to 20% by mass, based on the total amount of the water-in-oil emulsion cosmetic.

[0017] The water-in-oil emulsion cosmetic of the present invention can suppress the squeaking when applied to the skin by using (D) a water-soluble polymer in addition to the above components (A) to (C). Such a water-soluble polymer is not particularly limited as long as it can be used as a cosmetic. For example, acrylic acid-based water-soluble polymers, gum-based water-soluble polymers, etc. can be mentioned. Examples of acrylic acid-based water-soluble polymers include polyacrylic acid and its salts, carbomers, (acrylates / acrylic acid alkyl (C10-30)) cross-polymers, acrylamide / acrylamide-2-methylpropanesulfonate copolymer, hydroxyethyl acrylate / acryloyldimethyltaurine salt copolymer, acrylate / acryloyldimethyltaurine copolymer, acrylamide / acrylic acid-2-methylpropanesulfonate copolymer, acryloyldimethyltaurine salt / vinylpyrrolidone copolymer, etc. Examples of gum-based water-soluble polymers include gum arabic, tragacanth gum, guar gum, gellan gum, cyam gum, carob gum, karaya gum, xanthan gum, etc. In the water-in-oil type emulsified cosmetic of the present invention, one of these can be used alone, or two or more of them can be used in combination. From the viewpoint of effects, it is preferable to use one or more selected from gum-based water-soluble polymers. Among them, it is preferable to use one or more selected from gum arabic and xanthan gum, and it is more preferable to use gum arabic and xanthan gum in combination.

[0018] When blending the water-soluble polymer into the water-in-oil type emulsified cosmetic of the present invention, the blending amount is preferably 0.01 to 5% by mass, more preferably 0.01 to 2.5% by mass, based on the total amount of the cosmetic. If the blending amount exceeds 5% by mass, it may cause stickiness.

[0019] Other components that can be blended into the water-in-oil type emulsified cosmetic of the present invention will be described.

[0020] (Humectant component) A water-in-oil emulsion cosmetic of the present invention can contain a moisturizing component. Such a moisturizing component is not particularly limited as long as it can be formulated in cosmetics. Generally, it is not particularly limited as long as it can be formulated in cosmetics, but examples include polyols and their polymers such as glycerin, 1,3-butylene glycol, propylene glycol, 3-methyl-1,3-butanediol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-pentanediol, trimethylolpropane, pentaerythritol, hexylene glycol, diglycerin, polyglycerin, diethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, ethylene glycol-propylene glycol copolymer; glycol alkyl ethers such as diethylene glycol monoethyl ether (ethoxydiglycol), ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol dibutyl ether; sugar alcohols such as sorbitol, xylitol, erythritol, mannitol, maltitol; sugars and their derivatives such as glucose, fructose, galactose, mannose, threose, xylose, arabinose, fucose, ribose, deoxyribose, maltose, trehalose, sucrose, lactose, raffinose, gluconic acid, glucuronic acid, cyclodextrins (α-, β-, γ-cyclodextrin, and modified cyclodextrins such as maltosylated, hydroxyalkylated cyclodextrin), β-glucan, chitin, chitosan, heparin and its derivatives, pectin, arabinogalactan, dextrin, dextran, glycogen, ethyl glucoside, glucosyl ethyl methacrylate polymer or copolymer; natural-derived polysaccharides such as hyaluronic acid, sodium hyaluronate, acetylated hyaluronic acid, sodium chondroitin sulfate, mucoitin sulfate, caronin sulfate, keratosulfate, dermatan sulfate, jellyfish polysaccharide, fucoidan, tuberose polysaccharide; organic acids such as citric acid, tartaric acid, lactic acid and their salts; urea, 2-pyrrolidone-5-carboxylic acid and its salts such as sodium salt; betaine (trimethylglycine), proline, hydroxyproline, arginine, lysine, serine, glycine, alanine, phenylalanine, tyrosine, β-alanine,Amino acids such as threonine, glutamic acid, glutamine, asparagine, aspartic acid, cysteine, cystine, methionine, leucine, isoleucine, valine, tryptophan, histidine, taurine and their salts, collagen and its derivatives and hydrolysates, elastin and its hydrolysates, hydrolyzed keratin, hydrolyzed conchiolin, silk proteolytic peptides, hydrolyzed silk, sodium lauroyl hydrolyzed silk, soy proteolytic peptides, wheat proteolytic peptides, hydrolyzed wheat protein, caseinolytic peptides, hydrolyzed eggshell membrane protein, acylated peptides and other protein peptides and their derivatives, rice fermentation broth, rice bran fermentation broth, sake lees extract, Japanese sake extract, palmitoyl oligopeptide, palmitoyl pentapeptide, palmitoyl tetrapeptide and other acylated peptides, silylated peptides, lactic acid bacteria culture solution, yeast extract, bovine submandibular gland mucin, hypotaurine, sesame lignan glycoside, glutathione, albumin, whey, choline chloride, phosphorylcholine, placenta extract, etc. can be mentioned. Among these water-soluble humectants, one or more selected from glycerin, 1,3-butylene glycol, dipropylene glycol, propylene glycol, betaine, rice fermentation broth, rice bran fermentation broth, sake lees extract, Japanese sake extract can be used.

[0021] (Liquid oil) In the water-in-oil emulsion cosmetic of the present invention, a liquid oil can be blended. Such liquid oils are those commonly used in cosmetics and can be used without particular limitation as long as they are liquid at 25°C. Such liquid oils include rapeseed oil, avocado oil, almond oil, olive oil, kukui nut oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, rice oil, safflower oil, sunflower oil, soybean oil, evening primrose oil, corn oil, rapeseed oil, peach kernel oil, palm oil, palm kernel oil, castor oil, jojoba oil, grape seed oil, macadamia nut oil, meadowfoam oil, mink oil, coconut oil and other vegetable oils; Animal oils such as liquid horse oil, mink oil, liquid lanolin, etc.; Straight-chain or branched-chain hydrocarbon oils such as liquid paraffin, light isoparaffin, squalane, squalene, etc.; Higher fatty acids such as oleic acid, isostearic acid, etc. Higher alcohols such as isostearyl alcohol, octyldodecanol, and hexyl decanol; Alkyl glyceryl ethers such as isostearyl glyceryl ether; Ester oils of linear fatty acids and lower alcohols such as isopropyl myristate, butyl myristate, isopropyl palmitate, ethyl stearate, butyl stearate, ethyl oleate, ethyl linoleate, and isopropyl linoleate; Ester oils of linear fatty acids and linear higher alcohols such as cetyl caprate, hexyl laurate, decyl myristate, myristyl myristate, cetyl myristate, cetyl palmitate, stearyl stearate, decyl oleate, and oleyl oleate; Ester oils of linear fatty acids and branched-chain alcohols such as isostearyl laurate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, octyldodecyl myristate, 2-ethylhexyl palmitate, isocetyl palmitate, isostearyl palmitate, 2-ethylhexyl stearate, isocetyl stearate, isodecyl oleate, octyldodecyl oleate, and octyldodecyl ricinoleate; Ester oils of branched-chain fatty acids and lower alcohols such as ethyl isostearate and isopropyl isostearate; Ester oils of branched-chain fatty acids and linear higher alcohols such as cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, hexyl isostearate, and 2-hexyldecyl isostearate; Esters of fatty acids and polyhydric alcohols such as ethylene glycol dioctanoate, ethylene glycol dioleate, propylene glycol dicaprylate, propylene glycol di(caprylate / caprate), propylene glycol dicaprate, dipropylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol dioctanoate, glyceryl tricaprylate, glyceryl tri(2-ethylhexanoate), glyceryl tri(caprylate / caprate), glyceryl triisopalmitate, glyceryl diisostearate, trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate, pentaerythritol tetra(2-ethylhexanoate), pentaerythritol tetraisostearate, pentaerythritol tetra(2-ethylhexanoate); Esters of branched-chain fatty acids and branched-chain alcohols such as octyldodecyl neopentanoate, isocetyl octanoate, isostearyl octanoate, 2-ethylhexyl isopalmitate, hexyldecyl dimethyloctanoate, octyldodecyl dimethyloctanoate, 2-ethylhexyl isopalmitate, isostearyl isocetyl isostearate, isostearyl octyldodecyl isostearate; Esters with hydroxyl groups such as lauryl lactate, myristyl lactate, cetyl lactate, octyldodecyl lactate, trioctyl citrate, triisocetyl citrate, trioctyldodecyl citrate, diisostearyl malate; Esters of dibasic acids such as dioctyl succinate, diisopropyl adipate, diisobutyl adipate, dioctyl adipate, diethyl sebacate, diisopropyl sebacate, dioctyl sebacate; Silicone oils such as dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, silicone oil modified with higher alcohols; Fluorine oils such as fluoropolyethers, perfluoroalkyl ether silicones, etc. can be mentioned.

[0022] (Oil thickener) In the water-in-oil type emulsified cosmetic of the present invention, an oil thickener other than an oil-soluble acrylic acid ester-based homopolymer can be blended. Examples of such oil thickeners include those used in ordinary cosmetics, such as solid waxes, organically modified clay minerals, fumed silica, colloidal silica, dextrin fatty acid esters, metal soaps, sucrose fatty acid esters, amino acid-based gelling agents, and the like. Among these, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., it is preferably at least one selected from the group consisting of solid waxes, organically modified clay minerals, dextrin fatty acid esters, and amino acid-based gelling agents, and more preferably at least one selected from the group consisting of solid waxes, organically modified clay minerals, and dextrin fatty acid esters.

[0023] Examples of the solid wax include waxes having a melting point of 61°C or higher. Waxes having a melting point of 61°C or higher exhibit a solid state at 25°C. In the present invention, the melting point is measured by any one of the specifications for raw materials of quasi-drugs, Method 1, Method 2, or Method 3 of the general test methods. Which method to adopt depends on each component. If there is a description of the measurement method in the specifications for raw materials of quasi-drugs, follow it. If there is no description, select the measurement method in consideration of the melting point. Specifically, when the melting point is extremely high, exceeding 80°C significantly, Method 1 is generally used; for solid fats with a lower melting point than this, Method 2 is used; and for those called paste oils in catalogs, etc., Method 3 is generally used. However, any method that can be measured may be used as long as it is a measurable method.

[0024] The waxes with a melting point of 61°C or higher are not particularly limited as long as they are those commonly used in cosmetics. For example, mineral waxes such as ozokerite and ceresin; petroleum waxes such as paraffin and microcrystalline wax; synthetic hydrocarbons such as Fischer-Tropsch wax, polyethylene wax, and synthetic hydrocarbon wax; vegetable waxes such as carnauba wax, candelilla wax, rice wax, and sunflower wax; animal waxes such as beeswax and whale wax; synthetic waxes such as silicone wax and synthetic beeswax; and the like can be mentioned. Among these, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., one or more selected from the group consisting of petroleum waxes and silicone waxes are preferable. Also, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., these waxes preferably have a melting point of 65°C or higher and 140°C or lower, more preferably 70°C or higher and 110°C or lower.

[0025] The organically modified clay minerals are not particularly limited as long as they are those commonly used in cosmetics. For example, cation-modified clay minerals obtained by treating layered clay minerals such as bentonite, laponite, hectorite, montmorillonite, and magnesium aluminum silicate with a quaternary ammonium salt type cationic surfactant can be mentioned. Specifically, one or more selected from the group consisting of benzyl dimethyl stearyl ammonium chloride and dimethyl distearyl ammonium chloride are preferable, and dimethyl distearyl ammonium chloride is more preferable. Commercially available products of organically modified clay minerals include "Benton 38", "Benton 38VCG", "Benton 27" (manufactured by Elementis Japan Co., Ltd.), and the like.

[0026] The organically modified clay minerals can also be used as a premix gel diluted with a solvent from the viewpoints of improving workability and enhancing the thickening effect. Specifically, a premix gel in which an organically modified clay mineral is previously dispersed in a solvent is preferred. The solvent is not limited as long as it can be gelled by the organically modified clay mineral, and octyldodecanol, mineral oil, etc. are preferred from the viewpoint of improving the thickening effect. Further, from the viewpoint of efficiently dispersing the organically modified clay mineral, it is preferable to further contain polar additives such as propylene carbonate, ethanol, water, and various surfactants. From the viewpoints of improving workability and thickening effect, and suppressing oil separation of the premix gel itself, the content of the organically modified clay mineral in the premix gel is preferably 5% by mass or more, more preferably 8% by mass or more, still more preferably 10% by mass or more, and preferably 25% by mass or less, more preferably 20% by mass or less, still more preferably 18% by mass or less. Examples of commercially available products of the premix gel include "Benton Gel EUGV", "Benton Gel MIOV", "Benton Gel VS-5 PCV", "Benton Gel PTM V", "Benton Gel GTCC V" (manufactured by Elementis Japan Co., Ltd.), etc.

[0027] The dextrin fatty acid ester is not particularly limited as long as it is used in ordinary cosmetics. From the viewpoint of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., an ester of a fatty acid having 8 to 24 carbon atoms and dextrin is preferred, and an ester of a fatty acid having 14 to 20 carbon atoms and dextrin is more preferred. Further, it is preferable that the average degree of polymerization of dextrin is 3 or more and 150 or less. Specifically, examples include dextrin palmitate, dextrin stearate, dextrin palmitate / stearate, dextrin oleate, dextrin isopalmitate, dextrin isostearate, dextrin myristate, dextrin palmitate / 2-ethylhexanoate, etc. Among these, from the viewpoints of facilitating viscosity adjustment, enhancing uniform coatability, and enhancing the protective effects against ultraviolet rays, infrared rays, etc., dextrin palmitate, dextrin myristate, and dextrin palmitate·2-ethylhexanoate are preferable, and those containing at least dextrin palmitate are more preferable. Examples of commercially available dextrin fatty acid esters include dextrin palmitate (「Leopal KL2」, 「Leopal KS2」, 「Leopal TL2」), dextrin palmitate·2-ethylhexanoate 「Leopal TT2」, dextrin myristate 「Leopal MKL2」 (all manufactured by Chiba Flour Milling Co., Ltd.), etc.

[0028] The amino acid-based gelling agent can be used without particular limitation as long as it is a commonly used one in ordinary cosmetics. Specifically, dibutyl lauroyl glutamide and dibutyl ethylhexanoyl glutamide are preferable. Examples of commercially available amino acid-based gelling agents include dibutyl lauroyl glutamide 「GP-1」, dibutyl ethylhexanoyl glutamide 「EB-21」 (both manufactured by Ajinomoto Co., Inc.), etc.

[0029] From the viewpoints of improving workability and enhancing the thickening effect, the amino acid-based gelling agent can also be used as a premix gel diluted and dissolved with a solvent. Specifically, a premix gel in which the amino acid-based gelling agent is previously dissolved in a solvent is preferable. The solvent is not limited as long as it can be gelled by the amino acid-based gelling agent, but from the viewpoint of enhancing the thickening effect, octyldodecanol, isostearic acid, etc. are preferable. The content of the amino acid-based gelling agent in the premix gel is preferably 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, and preferably 45% by mass or less, more preferably 40% by mass or less, still more preferably 36% by mass or less, from the viewpoints of improving workability and enhancing the thickening effect, and suppressing oil separation of the premix gel itself. Examples of commercially available premix gels include "AJK-OD2046" (containing 20% by mass of an amino acid-based gelling agent), "AJK-IS3613" (containing 36% by mass of an amino acid-based gelling agent) (both manufactured by Kao Alcohol Industries Co., Ltd.), and the like.

[0030] The water-in-oil type emulsified cosmetic of the present invention can contain metal fine particle oxides for the purpose of imparting an ultraviolet ray protection function. As such metal oxide fine particles, those having an average particle diameter of 1 μm or less, preferably 0.1 μm or less, more preferably 0.1 to 0.01 μm as measured by a laser diffraction particle size distribution measurement method are preferred. Also, as the metal oxide, zinc oxide, titanium oxide, iron oxide, cerium oxide, etc. are preferably used. For such metal oxide fine particles, metal oxide fine particles whose surface activity has been reduced with an inorganic compound such as silica or alumina may be used.

[0031] Examples of commercially available zinc oxide fine particles as such metal oxide fine particles include FINEX-50 (manufactured by Sakai Chemical Industry Co., Ltd.), ZnO-350 (manufactured by Sumitomo Osaka Cement Co., Ltd.), Zinc Oxide FZO-50 (manufactured by Ishihara Sangyo Co., Ltd.), Fine Particle Zinc Oxide MZ-500 (manufactured by Teika Co., Ltd.), and the like. Examples of commercially available titanium oxide fine particles include STR-60, STR-100 (both manufactured by Sakai Chemical Industry Co., Ltd.), MT-500B (manufactured by Teika Co., Ltd.), and the like.

[0032] In addition to the above-described components, the water-in-oil type emulsified cosmetic of the present invention can contain optional components used in ordinary cosmetics and quasi-drugs to such an extent that the effects of the present invention are not impaired. Specifically, examples include oils, surfactants, thickeners, preservatives, fragrances, moisturizers, antioxidants, anti-inflammatory agents, antibacterial agents, whitening agents, and the like.

[0033] The water-in-oil type emulsified cosmetic of the present invention can be prepared by a conventional method.

[0034] As the dosage form of the water-in-oil emulsion cosmetic of the present invention, non-solid forms such as liquid, emulsion, cream, and multi-layer type including at least two layers of an aqueous layer and an oil layer can be mentioned. Among these, it is preferably in a water-in-oil emulsified state during use, and more preferably a two-layer separation type that is shaken and used during use. In the present invention, the "two-layer separation type" refers to a state in which it is separated into two layers, an oil layer and an emulsified layer in which powder is dispersed, during standing before use, and is a cosmetic used in a water-in-oil emulsified state by shaking during use. When the water-in-oil emulsion cosmetic of the present invention is of the two-layer separation type, it is preferably made into a water-in-oil emulsified state by shaking during use (that is, before application to the skin).

Examples

[0035] Hereinafter, the present invention will be specifically described by way of examples, but the scope of the present invention is not limited thereby. The blending amounts are in mass % unless otherwise specified.

[0036] [Stability Evaluation (Precipitation)] To confirm the dissolution stability of the organic ultraviolet absorber in the oil phase, after allowing the test examples shown in Table 1 to stand at 5°C for 1 month, the presence or absence of precipitation of the organic ultraviolet absorber was visually confirmed and evaluated as follows. The results are shown in Table 1. 〇: No precipitation △: Slight precipitation ×: Precipitation

[0037]

Table 1

[0038] As shown in Table 1, Test Example 1 containing an oil-soluble acrylate-based homopolymer and a phenyl-modified silicone oil was shown to be excellent in the dissolution stability (precipitation) of the organic ultraviolet absorber in the oil phase.

[0039] The evaluation methods of the examples and comparative examples of the present invention are shown. The examples and comparative examples were prepared by a conventional method.

[0040] [Ultraviolet Protection Effect] The ultraviolet protection effect was measured in vitro using an SPF analyzer (UV-2000S, manufactured by Labsphere). The measurement conditions were as follows: each sample shown in Table 2 was uniformly applied to Blender Surgical Tape (manufactured by 3M) at a rate of 2 mg / cm 2 . After application, the average value of the SPF values measured at five points in the range of 290 to 400 nm was calculated using the above-mentioned measuring instrument, and the evaluation was performed as follows. The results are shown in Table 2. 〇: SPF 70 or higher △: SPF 55 - 70 ×: Less than SPF 55

[0041] [Stability Evaluation (Redispersibility)] Each sample shown in Table 2 was filled into a transparent container, a stirring ball with a diameter of 6 mm (made of stainless steel) was put in, and centrifugation was performed at 3000 rpm for 10 minutes to reproduce the separation state during standing. Then, the redispersibility when shaken was observed, and the evaluation was performed as follows. The results are shown in Table 2. 〇: Redispersed homogeneously within 20 shakes or less △: Redispersed homogeneously within 21 - 50 shakes ×: Not redispersed after 50 shakes

[0042] [Evaluation of Use Feeling] Each sample shown in Table 3 was evaluated by a panel of three professional sensory evaluators regarding the ease of spreading and the presence of a crunching sound when applied to the skin as follows. The results are shown in Table 3. ◎: Very good spreading, no crunching sound at all 〇: Good spreading, no crunching sound △: Poor spreading, slightly crunchy ×: Poor spreading, crunchy

[0043]

Table 2

[0044] As shown in Table 2, Examples 1 and 2, which are the water-in-oil emulsified cosmetics of the present invention, were shown to be excellent in ultraviolet protection effect and stability (redispersibility).

[0045]

Table 3

[0046] As shown in Table 3, Examples 1 and 2, which are water-in-oil emulsified cosmetics of the present invention, were shown to have excellent usability.

[0047] From the above results, the water-in-oil emulsified cosmetics of the present invention exhibit the effects of excellent ultraviolet protection effect, stability, and usability.

Claims

【Claim 1】 An oil-in-water type emulsified cosmetic containing the following (A) to (C). (A) An oil-soluble acrylate homopolymer (B) An organic ultraviolet absorber (C) A phenyl-modified silicone oil

Images