Oil-in-water emulsion sunscreen cosmetic

Abstract

To provide an oil-in-water emulsion type sunscreen cosmetic that exhibits high UV protection while having a good emulsified state and a refreshing feel. [Solution] The present invention provides an oil-in-water emulsion type sunscreen cosmetic containing (A) to (C). (A) Fine particle titanium dioxide surface-treated with hydrated silica and hydrogen dimethicone (B) Organic UV absorbers (C) Hydrophobic modified polyether urethane

Description

[Technical Field]

[0001] This invention relates to an oil-in-water emulsion type sunscreen cosmetic that exhibits high UV protection while maintaining a good emulsified state and a refreshing feel. [Background technology]

[0002] It has been reported that if a certain amount or more of an oil-in-water emulsion cosmetic containing titanium dioxide coated with a surface treatment agent having aluminum and / or silica, and a water-soluble polymer having sulfonic acid as a constituent unit, is included in the molecule, the thickening effect and changes in appearance can be suppressed. (Patent Document 1)

[0003] Furthermore, it is known that sunscreen cosmetics containing hydrophobized zinc oxide, hydrophobized titanium oxide, hydrophobically modified polyether urethane, and polyacrylamide compounds have high UV protection effects and a refreshing gel-like texture. (Patent Document 2)

[0004] However, when incorporating water-soluble polymers having sulfonic acid constituent units as described in Patent Document 1 or polyacrylamide compounds as described in Patent Document 2 into cosmetics, it is necessary to include surfactants to ensure stable dispersion, and stickiness caused by the surfactants has been a problem. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-117486 [Patent Document 2] Japanese Patent Publication No. 2019-64966 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0006] The present invention aims to solve the above drawbacks and provide an oil-in-water emulsion sunscreen cosmetic that exhibits a high UV protection effect while having a good emulsified state and a fresh feel during use.

Means for Solving the Problems

[0007] The present invention provides an oil-in-water emulsion sunscreen cosmetic containing (A) to (C). (A) Fine particle titanium oxide surface-treated with hydrous silica and hydrogen dimethicone (B) Organic UV absorber (C) Hydrophobically modified polyether urethane is provided.

Effects of the Invention

[0008] The oil-in-water emulsion sunscreen cosmetic of the present invention exhibits the effect of having a fresh feel during use while showing a high UV protection effect.

Modes for Carrying Out the Invention

[0009] Hereinafter, modes for carrying out the present invention will be described.

[0010] (A) Fine particle titanium oxide surface-treated with hydrous silica and hydrogen dimethicone The fine particle titanium oxide surface-treated with hydrous silica and hydrogen dimethicone is not particularly limited as long as it can be usually blended into cosmetics and can be used. It is not particularly limited. The fine particle titanium oxide surface-treated with hydrous silica and hydrogen dimethicone is a powder obtained by coating titanium oxide fine particles in a state close to primary particles with hydrous silica and then performing a hydrophobization treatment using hydrogen dimethicone.

[0011] From the viewpoint of improving the UV protection effect of cosmetics, the average particle size of the fine titanium dioxide particles is preferably 1 nm or more, more preferably 5 nm or more, preferably 100 nm or less, and even more preferably 80 nm or less. Furthermore, from the viewpoint of suppressing stickiness when applying cosmetics and improving smoothness, it is preferably 1 nm or more, more preferably 7 nm or more, even more preferably 8 nm or more, preferably 100 nm or less, more preferably 50 nm or less, and even more preferably 30 nm or less. Here, the average particle size of the fine titanium dioxide particles is obtained by measuring the maximum minor diameter of 300 particles in an image using a transmission electron microscope (TEM) at a magnification of 100,000, and calculating the average value. Here, the maximum minor diameter refers to the minor diameter with the largest diameter among the minor diameters perpendicular to the major diameter.

[0012] "Hydrated silica" refers to silicic acid compounds obtained by neutralizing alkali metal silicates, and means that a variable amount of water (water of hydration) is bonded to it. When such hydrated silica is heated and calcined, it becomes silica through dehydration condensation. However, in the present invention, it is preferable that the material is coated with hydrated silica containing many hydroxyl groups without going through such a heating and calcination process. The amount of hydrated silica coating is preferably 0.1 to 1 part by mass of hydrated silica per 1 part by mass of titanium oxide, and more preferably 0.1 to 5 parts by mass of hydrated silica.

[0013] Fine-particle titanium dioxide surface-treated with hydrated silica and hydrogen dimethicone is obtained by further coating the hydrated silica-coated fine-particle titanium dioxide with hydrogen dimethicone. The hydrogen dimethicone is not particularly limited as long as it can be used in cosmetics. The method for coating the hydrated silica-coated fine-particle titanium dioxide with hydrogen dimethicone is not particularly limited as long as it is a method normally used for cosmetic powders. For example, the hydrated silica-coated fine-particle titanium dioxide and hydrogen dimethicone diluted 10 times with isopropyl alcohol are thoroughly mixed, heated at 105°C for 6 hours, and then pulverized using an atomizer or the like. The coating amount is preferably 0.01 to 0.1 parts by mass per 1 part by mass of the base fine-particle titanium dioxide.

[0014] The titanium dioxide fine particles surface-treated with hydrated silica and hydrogen dimethicone according to the present invention may be processed for cosmetic preparation, or commercially available STR-100W-LP (manufactured by Sakai Chemical Industry Co., Ltd.) may be used. Alternatively, DIS-AB-10W (manufactured by Sakai Chemical Industry Co., Ltd.), which is an aqueous dispersion of titanium dioxide fine particles surface-treated with hydrated silica and hydrogen dimethicone, may be used.

[0015] The amount of titanium dioxide microparticles surface-treated with hydrated silica and hydrogen dimethicone varies depending on the desired SPF value and the amount of organic UV absorber used in combination, but is preferably 1 to 10% by mass of pure titanium dioxide, and more preferably 1 to 5% by mass, relative to the total amount of the oil-in-water emulsion type sunscreen cosmetic.

[0016] (B) Organic UV absorbers Organic UV absorbers are not particularly limited as long as they can be incorporated into cosmetics. For example, cinnamic acid derivatives such as ethylhexyl paramethoxycinnamate, isopropyl methoxycinnamate, and isoamyl methoxycinnamate; PABA derivatives such as para-aminobenzoic acid (hereinafter abbreviated as "PABA"), ethyl PABA, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, and glyceryl PABA; salicylic acid derivatives such as homosalate, ethylhexyl salicylate, dipropylene glycol salicylate, and TEA salicylate; benzophenone-1, benzophenone-2, Benzophenone derivatives such as benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12; benzylidene derivatives such as 3-benzylidene, 4-methylbenzylidene, benzylidene sulfonic acid, benzalkonium methosulfate, terephthalylidene disulfonic acid, polyacrylamide methylbenzylidene; ethylhexyl Triazine derivatives such as triazone, anisotriazine, diethylhexylbutamide triazone, 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine, ethylhexyltriazone, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine; phenylbenzimidazole derivatives such as phenylbenzimidazole sulfonic acid and phenyldibenzimidazole tetrasulfonate disodium; drometrizole trisiloxane Phenylbenzotriazole derivatives such as methylenebis(benzotriazolyltetramethylbutylphenol); anthranil derivatives such as menthyl anthranilate; imidazoline derivatives such as 2-ethylhexyl dimethoxybenzylideneoxoimidazolidinepropionate; benzalmalonate derivatives such as polyorganosiloxanes having a benzalmalonate functional group; 4,4-diarylbutadiene derivatives such as 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene;Examples include octocrylene, hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate, 4-tert-butyl-4'-methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyltriazine, etc. These organic ultraviolet absorbers can be used alone or in combination of two or more kinds. ;

[0017] From the viewpoints of ultraviolet absorption ability and skin safety, it is preferable to use ethylhexyl methoxycinnamate. Further, in order to also have a UVA protection function, it is preferable to use hexyl diethylaminohydroxybenzoyl benzoate and ethylhexyl methoxycinnamate in combination.

[0018] The (B) organic ultraviolet absorber used in the present invention is preferably formulated at 1 to 30% by mass, particularly preferably 3 to 30% by mass, based on the total amount of the water-in-oil type emulsified sunscreen cosmetic. If it is less than 1% by mass, the ultraviolet protection effect may not be sufficiently obtained. Also, if it is formulated in excess of 30% by mass, it may cause stickiness and primary irritation to the skin.

[0019] (C) Hydrophobically modified polyether urethane The component (C) hydrophobically modified polyether urethane is an amphiphilic copolymer having a hydrophilic base as a skeleton and a hydrophobic part at the terminal, and is not particularly limited as long as the hydrophobic parts of the copolymer associate with each other in an aqueous medium to exhibit a thickening effect. Examples include those represented by the following general formula (1). (R 1 -{(O-R 2 ) k -OCONH-R 3 [-NHCOO-(R 4 -O) n -R 5 h} m ···(1) In the above formula (1), R 1 , R 2 and R 4 represent hydrocarbon groups which may be the same or different from each other, and R 3 ​R represents a hydrocarbon group which may have a urethane bond, 5 R represents a linear, branched, or secondary hydrocarbon group, m is a number greater than or equal to 2, h is a number greater than or equal to 1, and k and n are independently numbers in the range of 0 to 1000. 1 , R 2 and R 4 The number of carbon atoms is 2 to 4, R 3 The number of carbon atoms is 1 to 10, R 5 The carbon number of is preferably 8 to 36. Also, m is preferably 2, h is preferably 1, k is preferably 1 to 500, and more preferably 100 to 300. Also, n is preferably 1 to 200, and more preferably 10 to 100.

[0020] The hydrophobic modified polyether urethane represented by the above general formula (1) is, for example, R 1 -[(OR 2 ) k -OH] m One or more polyether polyols represented by R 3 -(NCO) h+1 One or more polyisocyanates represented by and HO-(R 4 -O) n -R 5 It can be obtained by reacting one or more polyether monoalcohols represented by [formula] with [another form].

[0021] In this case, R in general formula (1) 1 ~R 5 R used in the above reaction 1 -[(OR 2 ) k -OH] m , R 3 -(NCO) h+1 , HO-(R 4 -O) n -R 5 This is determined by [the following]. The mixing ratio of these three components is not particularly limited, but it is preferable that the ratio of hydroxyl groups derived from polyether polyol and polyether monoalcohol to isocyanate groups derived from polyisocyanate is NCO / OH = 0.8:1 to 1.4:1.

[0022] Among the hydrophobic modified polyether urethanes represented by the above general formula (1), those having a structure in which both ends of polyethylene glycol are modified with decyltetradecyl alcohol and having an average weight molecular weight of about 50,000 (GPC method) are preferably used. Examples of such hydrophobic modified polyether urethanes include polyethylene glycol (PEG)-240 / decyltetradeceth-20 / hexamethylene diisocyanate (HDI) copolymer. This PEG-240 / decyltetradeceth-20 / HDI copolymer is sold by ADEKA Corporation as Adekanol GT-700. Various hydrophobic modified polyether urethanes may be used in combination.

[0023] The amount of component (C) hydrophobic modified polyether urethane used in this invention is preferably 0.05 to 2% by mass, and more preferably 0.7 to 2% by mass, relative to the total amount of the oil-in-water emulsion type sunscreen cosmetic. Within this range, the product exhibits excellent freshness during use and good stability over time.

[0024] The present invention provides an oil-in-water emulsion type sunscreen cosmetic that is stable without the need for special emulsifiers, by using components (A) to (C) in combination.

[0025] Because the oil-in-water emulsion type sunscreen cosmetic of the present invention is an oil-in-water emulsion, it can be removed from the skin with ordinary cleansing products without the need for special cleansing agents.

[0026] The method for preparing the oil-in-water emulsion type sunscreen cosmetic of the present invention is not particularly limited and can be prepared by the usual method for preparing oil-in-water emulsion type cosmetics.

[0027] The oil-in-water emulsion type sunscreen cosmetic of the present invention may contain water-soluble polysaccharides. Examples of water-soluble polysaccharides include gums (gellan gum, xanthan gum, sclerotium gum, locust bean gum, biosaccharide gum, tamarind gum, quince seed gum, gum arabic, carrageenan, tara gum, guar gum, galactan, gum arabic, tragacanth gum, curdlan, succinoglucan, etc.); carrageenan; heparin-like substances; alginates (alginic acid, sodium alginate, propylene glycol alginate, etc.); agar (including agarose); pectin; pullulan; mannan, etc.

[0028] Gellan gum is produced by Pseudomonas elodea through aerobic fermentation using glucose and other carbon sources, and its constituent sugars are glucose, glucuronic acid, and rhamnose. When gellan gum is produced by fermentation, acetyl and glyceryl groups are present in the glucose molecules linked 1-3 in the main chain. Native gellan gum is obtained by recovering and processing this product, and deacylated gellan gum is obtained by removing the acyl groups (acetyl and glyceryl groups) from this native gellan gum. The type of gellan gum used in this invention is not particularly limited, but native gellan gum is more preferred. The viscosity-average molecular weight of the gellan gum is 10,000 to 5,000,000, preferably 100,000 to 1,000,000, and more preferably 300,000 to 700,000. The oil-in-water emulsion type sunscreen cosmetic of the present invention may use commercially available products and is not particularly limited, but for example, KELCOGEL CG-LA, KELCOGEL CG-HA, Kelcogel HM, Kelcogel DGA (all manufactured by CP Kelco US) can be used.

[0029] Xanthan gum is produced by Xanthomonas bacteria through fermentation using hydrocarbons as a carbon source, and its constituent sugars include glucose, mannose, and glucuronic acid. The oil-in-water emulsion sunscreen cosmetic of the present invention may use commercially available products and is not particularly limited, but for example, KELTROL CG, KELTROL CG-T, KELTROL CG-SFT, KELTROL T (manufactured by CPKelco), Nomcoat ZZ (manufactured by Nisshin Oillio), Echogum T (manufactured by Dainippon Sumitomo Pharma Co., Ltd.) can be used.

[0030] Sclerotium gum is a encapsulated β-D-glucan produced from a fungal species grown in a culture medium containing glucose or sucrose as a carbon source and a complex nitrogen source with an inorganic salt. While not particularly limited, for example, glucans with an estimated degree of polymerization of about 100 can be obtained from Sclerotium glucanicum, and glucans with a degree of polymerization of about 800 can be obtained from Sclerotium rolfsii strain. Various sclerotium gums differ slightly in the number and length of side chains, in addition to the degree of polymerization. Commercially available products may be used for the oil-in-water emulsion sunscreen cosmetic of the present invention, and are not particularly limited; for example, AMIGEL (manufactured by Alban Muller) can be used.

[0031] Gum arabic is an acidic polysaccharide obtained from the sap of acacia plants, which belong to the legume family, and its constituent sugars are galactose, L-arabinose, L-rhamnose, and glucuronic acid. Commercially available products may be used in the oil-in-water emulsion type sunscreen cosmetic of the present invention, but are not limited to these; for example, Arabiccol SS (manufactured by Sanei Pharmaceutical Trading Co., Ltd.) can be used.

[0032] Tamarind seed gum is a xyloglucan whose main chain is glucose and whose side chains are xylose. Commercially available products may be used in the oil-in-water emulsion type sunscreen cosmetic of the present invention, and are not particularly limited, but for example, Glyloid 6C (manufactured by Dainippon Pharmaceutical Co., Ltd.) can be used.

[0033] Biosaccharide gums, specifically biosaccharide gums-1, 2, 3, and 4, are known and are all obtained from sorbitol by fermentation, although the manufacturing method is not particularly limited. Biosaccharide gum-1 is a polysaccharide in which L-fucose, D-galactose, and D-galacturonic acid are continuously linked. Biosaccharide gum-2 is a polysaccharide mainly composed of rhamnose and is a polymer of α-L-Rhap(1→3)-β-D-Galp-(1→2)―α―LRhap(1→4)―β―D-Glep-(1→3)-[α-L-Rhap-(1→2)-]―α―D-Galp-(1). Biosaccharide gum-3 is a polysaccharide in which L-fucose, D-galactose, and D-galacturonic acid are continuously linked, but is more complex than biosaccharide gum-1. These are polysaccharides with a low degree of polymerization and molecular weight. Biosaccharide gum-4 is a deacetylated branched polysaccharide with L-fucose, 2-D-glucose, and glucuronic acid as repeating units. Among these, biosaccharide gum-1 is preferably used in the oil-in-water emulsion type sunscreen cosmetic of the present invention. Commercial products may be used in the oil-in-water emulsion type sunscreen cosmetic of the present invention and are not particularly limited, but for example, FUCOGEL 1.5P and FUCOGEL 1000 PP, which are biosaccharide gum-1; Rhamnosoft HP 1.5P, which is biosaccharide gum-2; and Glicofilm 1.5P, which is biosaccharide gum-4 (all manufactured by Solavia, France) can be used.

[0034] Carrageenan is a natural polymer extracted and purified from red algae. The main chain of carrageenan is composed of galactose, and it is broadly classified into kappa-type carrageenan, iota-type carrageenan, and lambda-type carrageenan depending on the position and number of attached sulfate groups and the presence or absence of an anhydro structure. The type of carrageenan used in this invention is not particularly limited, but kappa-type carrageenan is preferred. For the oil-in-water emulsion type sunscreen cosmetic composition of this invention, GENUVISCO type PJ-JPE (manufactured by CP Kelco), Soagina MV101, Soagina MV201, Soagina MV320M (all manufactured by MRC Polysaccharides) can be used.

[0035] Heparin-like substances are polysulfated mucopolysaccharides such as polysulfated chondroitin. Preferably, each monosaccharide molecule constituting the mucopolysaccharide contains an average of 0.5 to 5 sulfate groups, and more preferably an average of 0.6 to 3 sulfate groups. Heparin-like substances include, for example, heparin, as well as polysulfated chondroitins such as chondroitin sulfate D and chondroitin sulfate E. Among these, heparin-like substances listed in the Japanese Pharmacopoeia (Standards for Non-Official Drugs) are particularly suitable.

[0036] Pectin is a polysaccharide composed of rhamnose and galacturonic acid, in which a portion of the galacturonic acid in the main chain is esterified with methyl or acetyl groups. The molar content (%) of methyl-esterified galacturonic acid is defined as the degree of methyl esterification (DE). Pectin with a DE of 50% or more is called high-methoxyl (HM) pectin, and pectin with a DE of less than 50% is called low-methoxyl (LM) pectin. Either HM pectin or LM pectin may be used in the oil-in-water emulsion type sunscreen cosmetic of the present invention. Commercial products are not particularly limited, but for example, GENU pectin LM-104AS-J, GENU pectin USP-H (manufactured by CP Kelco), etc. can be used.

[0037] Agar is a polysaccharide obtained from the mucilage of red algae such as Gelidium and Gracilaria, and consists of agarose and agaropectin. The oil-in-water emulsion type sunscreen cosmetic of the present invention is not particularly limited in terms of the degree of polymerization and molecular weight of agarose and agaropectin, or the content of sulfate groups and pyruvate groups in the agar, and any of them may be used. Commercial products that can be used are not particularly limited, but for example, Agar AX-30, UP-6, UP-37CS, Ultra Agar UX-30, UX-200 (all manufactured by Ina Food Industry Co., Ltd.) can be used.

[0038] Pullulan is a compound in which maltotriose, consisting of three glucose molecules linked by α-1,4 glucosidic bonds, is repeatedly linked in a chain by α-1,6 glucosidic bonds. The oil-in-water emulsion type sunscreen cosmetic of the present invention may use commercially available products and is not particularly limited, but for example, PU101 and cosmetic pullulan (manufactured by Hayashibara Co., Ltd.) can be used.

[0039] Alginic acids are alginic acid, which is formed by the linear linkage of two types of uronic acids, mannuronic acid and guluronic acid; salts of alginic acid; and derivatives of alginic acid such as propylene glycol alginate. Examples of salts include sodium salts and potassium salts, with sodium salts being preferred. The oil-in-water emulsion type sunscreen cosmetic of the present invention may use commercially available products, and is not limited to these, but examples include DuckAlgin NSPM-R (manufactured by Kikkoman Biochemifa), KimikaAlgin IL-2 (manufactured by Kimika), DuckAlgin NSPH2R, Duckroid FF-50-M (manufactured by Kikkoman Biochemifa), and sodium alginate HG (manufactured by Maikon Kohara Co., Ltd.).

[0040] As the water-soluble polysaccharide, one or two selected from gellan gum and xanthan gum can be used, and by using gellan gum and xanthan gum in combination, The dispersion stability and emulsification stability of the powder are improved.

[0041] The oil-in-water emulsion type sunscreen cosmetic of the present invention may contain fine-particle zinc oxide to improve the feel and enhance UVA shielding ability. The fine-particle zinc oxide can be any type commonly used in cosmetics and is not particularly limited in shape. Examples of commercially available fine-particle zinc oxide include FINEX-25, FINEX-30, FINEX-50 (all manufactured by Sakai Chemical Industry Co., Ltd.), MZ-300, and MZ-500 (all manufactured by Teika Co., Ltd.).

[0042] The zinc oxide particles can be used with their surfaces hydrophilized or hydrophobic as needed. Examples of hydrophilic treatment methods include surface treatments such as treatment with polyhydric alcohols such as glycerin and hyaluronic acid. Examples of hydrophobic treatment methods include surface treatments such as treatment with fluorine compounds, silicone, alkyl, alkylsilane, metal soap, water-soluble polymer, amino acid, N-acyl amino acid, lecithin, organic titanate, polyol, acrylic resin, methacrylic resin, urethane resin, and fatty acid.

[0043] Fine-particle zinc oxide and / or surface-treated fine-particle zinc oxide can be incorporated into cosmetics as is, but if necessary, zinc oxide coated on the surface of other powders such as talc, mica, sericite, silica, or spherical powders can be used.

[0044] Fine-particle zinc oxide and / or surface-treated fine-particle zinc oxide can be incorporated directly into cosmetics as a powder, but they can also be used in which they are pre-dispersed in oils such as silicone oil and hydrocarbon oil, or in aqueous components.

[0045] In addition to the essential and optional components mentioned above, the oil-in-water emulsion sunscreen cosmetic composition of the present invention may appropriately contain, as needed, aqueous components, oily components, humectants, pigments, surfactants, thickeners, beauty ingredients, fragrances, polymers, antibacterial and antimicrobial agents, alcohols, powders, bio-derived components, and the like, which are commonly used in cosmetics.

[0046] The oil-in-water emulsion type sunscreen cosmetic of the present invention can be used in the form of a gel, emulsion, or cream, for example. [Examples]

[0047] The present invention will be specifically described below with reference to examples, but this will not limit the scope of the present invention. Unless otherwise specified, the amounts are given in mass percent.

[0048] First, we will explain the evaluation method for the prepared oil-in-water emulsion type sunscreen cosmetic.

[0049] [Emulsification state immediately after preparation] The emulsification state was observed immediately after preparation, and those with good emulsification were marked with "○", while those with separation or other issues were marked with "×".

[0050] [Usability] The cosmetic product, which was left to stand at room temperature for one day after preparation, was independently evaluated by three sensory evaluation specialists, and the results of the usability evaluation were determined by consensus based on the following criteria. ○: Has a refreshing feel. △: Doesn't seem very fresh. ×: Does not feel fresh.

[0051] [SPF (Sun Protection Factor)] SPF was measured in vitro using an SPF analyzer (UV-2000S, Labsphere). The measurement conditions were as follows: 1 mg / cm of the sample listed in Table 2 was applied to surgical tape (M3 Corporation). 2 After uniformly applying the product in the specified ratio, the SPF value in the range of 290-400 nm was measured using the aforementioned measuring instrument, and the average value of 5 points × 3 measurements was calculated.

[0052] Oil-in-water emulsion sunscreen cosmetics, serving as examples and comparative examples of the present invention, were prepared using the formulations shown below. The examples and comparative examples were prepared by conventional methods.

[0053] [Table 1]

[0054] As shown in Table 1, the oil-in-water emulsion type sunscreen cosmetic of the present invention had a more refreshing feel than Comparative Example 1, which was emulsified using (hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer. Furthermore, Comparative Example 2, which contained (acrylates / C10-30 alkyl acrylate) crosspolymer, exhibited poor emulsification, separation was observed immediately after preparation, and therefore could not be evaluated for usability.

[0055] [Table 2]

[0056] As shown in Table 2, the oil-in-water emulsion type sunscreen cosmetic of the present invention (Example 1) showed a higher SPF value compared to Comparative Example 3, which contained an equivalent amount of fine titanium dioxide, and had a refreshing feel.

[0057] [Table 3]

[0058] As shown in Table 3, the oil-in-water emulsion type sunscreen cosmetic composition according to Example 2 exhibited excellent emulsification stability and usability.

Claims

[Claim 1] Oil-in-water emulsion sunscreen cosmetic containing (A) to (C) (A) Fine particle titanium dioxide surface-treated with hydrated silica and hydrogen dimethicone (B) Organic UV absorbers (C) Hydrophobic modified polyether urethane

Images