Sunscreen cosmetic

Abstract

To provide a sunscreen cosmetic that is less sticky and have excellent smoothness when applied.SOLUTION: Provided is a sunscreen cosmetic comprising (A) an ultraviolet absorber that is solid at a room temperature and (B) an ester oil, a content of the (A) ultraviolet absorber that is solid at a room temperature being 4.5 mass% or more, the total amount of all ultraviolet absorbers relative to the total amount of the sunscreen cosmetic being 12 mass% or more, the (B) ester oil comprising both (B-1) an ester oil that is solid at a room temperature and (B-2) an ester oil having spreadability, measured by a specific measurement method, of 550 (mm2 / 10 min) or less, a content of the (B-2) ester oil per 1 pt.mass of the (B-1) ester oil being 7 to 15 pts.mass, the total content of the (B-1) ester oil and the (B-2) ester oil being 3 to 8 mass%, relative to the total amount of the sunscreen cosmetic, and the sunscreen cosmetic being an O / W Pickering emulsion.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a sunscreen cosmetic. [Background technology]

[0002] Topical compositions containing metal oxide powders are widely known. For example, finely divided powders of metal oxides such as titanium oxide, zinc oxide, zirconium oxide, and cerium oxide have the ability to scatter, absorb, and reflect ultraviolet rays, and are therefore incorporated as ultraviolet shielding materials into topical sunscreen compositions (e.g., Patent Document 1). Also known are Pickering emulsions that are stabilized by adsorbing metal oxides such as silica to the emulsion interface (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-014300 [Patent Document 2] Special Publication No. 2017-503643 [Non-patent literature]

[0004] [Non-Patent Document 1] Von U. Zeidler et al., FETTE SEIFEN ANSTRICHMITTEL, (1985) 87, 10, 403-408 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a solid ultraviolet absorber is contained in a sunscreen cosmetic that is a Pickering emulsion, there is a problem that the preparation is very sticky and lacks smoothness when applied, making it difficult to apply.

[0006] Therefore, an object of the present invention is to provide a sunscreen cosmetic that is at least less sticky or has excellent smoothness when applied. [Means for solving the problem]

[0007] As a result of intensive research, the present inventors have discovered that by blending a specific ester oil into a sunscreen cosmetic which is a Pickering emulsion containing a solid ultraviolet absorber, a sunscreen cosmetic which is less sticky or has excellent smoothness when applied can be obtained, and have completed the present invention.

[0008] That is, the present invention, which solves the above problems, (A) an ultraviolet absorber that is solid at room temperature; (B) an ester oil, The (B) ester oil is (B-1) an ester oil that is solid at room temperature; and / or (B-2) The ductility measured by the following method is 550 (mm 2 / 10min) or less, It is a Pickering emulsion. It is a sunscreen cosmetic. (Measurement method) At room temperature, 4 mg of the ester oil to be measured and 4 mg of the standard tetradecanoate were dropped onto the forearm, and the area (mm 2 ) is measured, and the spreadability of the ester oil is calculated according to the following formula 1. (Formula 1) (Ductility of measurement object) = (area of ​​measurement object / area of ​​standard product) x 780

[0009] The sunscreen cosmetic of the present invention contains a solid ultraviolet absorber, yet has little stickiness and is excellent in smoothness when applied.

[0010] In a preferred embodiment of the present invention, (B) includes both (B-1) and (B-2). The ester oil is solid at room temperature, and the extensibility measured by the above measurement method is 550 (mm 2 A sunscreen cosmetic containing both an ester oil and an ester oil having a viscosity of 1000 saturations (10 min) or less has a less sticky feeling and is excellent in smoothness upon application.

[0011] In a preferred embodiment of the present invention, the content of the component (B) is 3% by mass or more.

[0012] In a preferred embodiment of the present invention, The content of the component (B-1) is 3 to 20 mass %, The content of the component (B-2) is 0.1 to 3% by mass.

[0013] In a preferred embodiment of the present invention, the composition further contains (C) silica-based fine particles.

[0014] In a preferred embodiment of the present invention, The (C) is a silylated silica fine particle.

[0015] In a preferred embodiment of the present invention, The sunscreen cosmetic is substantially free of surfactants. [Effects of the Invention]

[0016] The sunscreen cosmetic of the present invention has little stickiness and is excellent in smoothness when applied. DETAILED DESCRIPTION OF THE INVENTION

[0017] The sunscreen cosmetic of the present invention contains (A) an ultraviolet absorber that is solid at room temperature and (B) a specific ester oil. Each component will be described in detail below.

[0018] (1)(A) UV absorber that is solid at room temperature In this specification, "solid at room temperature" means that the substance is solid in an environment of 25°C and atmospheric pressure. Examples of such ultraviolet absorbers include, but are not limited to, benzoic acid derivatives such as diethylaminohydroxybenzoylhexylbenzoate, paraaminobenzoic acid, and dimethylparaaminobenzoic acid ethyl ester, and triazine derivatives such as bisethylhexyloxyphenol methoxyphenyl triazine and trianilinocarboethylhexyloxytriazine. In addition, anthranilic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, etc. can be used as long as they are solid at room temperature. One or more types of ultraviolet absorbents that are solid at room temperature may be contained.

[0019] Furthermore, the sunscreen cosmetic of the present invention may contain an ultraviolet absorber that is semi-solid or liquid at room temperature, so long as it contains an ultraviolet absorber that is solid at room temperature.

[0020] The content of the ultraviolet absorber that is solid at room temperature is preferably 3% by mass or more, more preferably 4% by mass or more, even more preferably 4.5% by mass or more, and particularly preferably 5% by mass or more, based on the total amount of the sunscreen cosmetic. The content of the ultraviolet absorber that is solid at room temperature is preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 6% by mass or less, based on the total amount of the sunscreen cosmetic.

[0021] The content of the ultraviolet absorber that is solid at room temperature is preferably 22% by mass or more, more preferably 23% by mass or more, even more preferably 24% by mass or more, particularly preferably 24.5% by mass or more, and most preferably 25% by mass or more, based on the total amount of ultraviolet absorbers in the sunscreen cosmetic. Furthermore, the content of the ultraviolet absorber that is solid at room temperature is preferably 30% by mass or less, more preferably 28% by mass or less, and even more preferably 26% by mass or less, based on the total amount of ultraviolet absorbers in the sunscreen cosmetic.

[0022] The total amount of all ultraviolet absorbers relative to the total amount of the sunscreen cosmetic is preferably 12% by mass or more, more preferably 15% by mass or more, even more preferably 18% by mass or more, and particularly preferably 20% by mass or more. Furthermore, the total amount of all ultraviolet absorbers relative to the total amount of the sunscreen cosmetic is preferably 35% by mass or less, more preferably 30% by mass or less, even more preferably 28% by mass or less, and particularly preferably 25% by mass or less.

[0023] The sunscreen cosmetic of the present invention preferably has an SPF value of 50+, and preferably contains an ultraviolet absorber or an ultraviolet scattering agent so that the SPF value becomes 50+. The sunscreen cosmetic of the present invention is excellent in that it is non-sticky and has excellent smoothness when applied, even when it contains an ultraviolet absorber, particularly a solid ultraviolet absorber, so as to achieve a high SPF value of 50+.

[0024] (2)(B) Ester oil The sunscreen cosmetic of the present invention comprises (B-1) an ester oil that is solid at room temperature, and / or (B-2) an ester oil having a spreadability of 550 (mm 2 / 10min) or less ester oil. Preferably, both the component (B-1) and the component (B-2) are contained.

[0025] By blending an ester oil that is solid at room temperature or an ester oil with low spreadability together with a solid ultraviolet absorber, the ester oil covers the ultraviolet absorber in the formulation, improving the stickiness caused by the ultraviolet absorber that is solid at room temperature or the smoothness during application.

[0026] The content of the ester oil relative to the total amount of the sunscreen cosmetic is preferably 5 to 30 mass%, more preferably 8 to 25 mass%, even more preferably 10 to 25 mass%, and particularly preferably 10 to 20 mass%.

[0027] The content of the ester oil relative to the total amount of the oily base in the sunscreen cosmetic is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, particularly preferably 80% by mass or more, and most preferably 90% by mass or more. The entire amount of the oily base may be ester oil.

[0028] (2-1) (B-1) Ester oil that is solid at room temperature One embodiment of the present invention includes an ester oil that is solid at room temperature. Examples of ester oils that are solid at room temperature include fatty acid esters containing a fatty acid residue having 14 or more carbon atoms. Fatty acid esters are preferably fatty acid alkyl esters.

[0029] The fatty acid alkyl ester is not particularly limited as long as it is solid at room temperature, but the number of carbon atoms in the alkyl chain of the alcohol residue of the ester is preferably 1 to 22, more preferably 4 to 20, even more preferably 6 to 18, and particularly preferably 8 to 18.

[0030] Examples of the ester oil (B-1) include myristyl myristate, cetyl palmitate, stearyl stearate, and hexyldecyl stearate.

[0031] The content of the ester oil (B-1) is preferably 0.05 to 3 mass%, more preferably 0.1 to 3 mass%, even more preferably 0.1 to 2 mass%, particularly preferably 0.3 to 1.5 mass%, and most preferably 0.5 to 1 mass%, relative to the total amount of the sunscreen cosmetic. The content of the ester oil (B-1) is preferably 1 to 10 mass %, more preferably 1 to 8 mass %, and even more preferably 3 to 7 mass %, based on the total amount of the ester oil.

[0032] (2-2)(B-2) Spreadability is 550(mm) 2 / 10min) or less ester oil In one embodiment of the present invention, the extensibility measured by the following measurement method with reference to the method of Non-Patent Document 1 is 550 (mm 2 / 10min) or less ester oil.

[0033] (Measurement method) At room temperature, 4 mg of the ester oil to be measured and 4 mg of the standard tetradecanoate were dropped onto the forearm, and the area (mm 2 ) is measured, and the spreadability of the ester oil is calculated according to the following formula 1. (Formula 1) (Ductility of measurement object) = (area of ​​measurement object / area of ​​standard product) x 780

[0034] Spreadability is 550(mm) 2 / 10min or less, pentaerythritol tetraethylhexanoate (490 (mm 2 / 10min)), isocetyl stearate (450 (mm 2 / 10min)), octyldodecyl myristate (450 (mm 2 / 10min)), alkyl benzoate with 12 to 15 carbon atoms (400 (mm 2 / 10min)), oleyl erucate (350 (mm 2 / 10 min)) can be exemplified.

[0035] Spreadability of ester oil (B-2) (mm 2 / 10 min) is preferably 540 or less, more preferably 520 or less, even more preferably 500 or less, and particularly preferably 490 or less.

[0036] The content of the ester oil (B-2) is preferably 1 to 20 mass % relative to the total amount of the sunscreen cosmetic, more preferably 3 to 18 mass %, even more preferably 4 to 15 mass %, particularly preferably 5 to 12 mass %, and most preferably 5 to 10 mass %. The content of the ester oil (B-2) is preferably 20% by mass or more, more preferably 25% by mass or more, and even more preferably 30% by mass or more, based on the total amount of ester oil. The content of the ester oil (B-2) is preferably 90% by mass or less, more preferably 80% by mass or less, even more preferably 75% by mass or less, and particularly preferably 70% by mass or less, based on the total amount of ester oil.

[0037] When both ester oils (B-1) and (B-2) are contained, their total content is preferably 1 to 20% by mass, more preferably 2 to 18% by mass, even more preferably 3 to 15% by mass, particularly preferably 4 to 12% by mass, and most preferably 5 to 12% by mass, based on the total amount of the sunscreen cosmetic. Alternatively, the total content is preferably 2 to 10% by mass, more preferably 3 to 8% by mass, and even more preferably 4 to 6% by mass.

[0038] When both the ester oils (B-1) and (B-2) are contained, the total content thereof is preferably 20% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, and particularly preferably 35% by mass or more, based on the total amount of ester oils contained in the sunscreen cosmetic. Furthermore, when the sunscreen cosmetic contains both the ester oils (B-1) and (B-2), the total content thereof is preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, particularly preferably 50% by mass or less, and most preferably 45% by mass or less, based on the total amount of ester oils contained in the sunscreen cosmetic.

[0039] When both the ester oils (B-1) and (B-2) are contained, the content of the ester oil (B-2) per part by mass of the ester oil (B-1) is preferably 1 to 30 parts by mass, more preferably 3 to 25 parts by mass, even more preferably 5 to 20 parts by mass, particularly preferably 7 to 15 parts by mass, and most preferably 8 to 12 parts by mass.

[0040] The sunscreen cosmetic of the present invention may contain an ester oil other than the ester oil (B-1) and the ester oil (B-2). Examples of ester oils other than (B-1) and (B-2) include caprylic / capric triglyceride, oleyl erucate, octyldodecanol, decyl oleate, ethylhexyl stearate, ethylhexyl palmitate, isopropyl palmitate, isopropyl myristate, dicaprylyl carbonate, and propylheptyl caprylate.

[0041] (3) Sunscreen cosmetics The sunscreen cosmetic of the present invention is a Pickering emulsion containing the above-mentioned components (A) and (B). A Pickering emulsion is an emulsion composition stabilized by particles. If the particles contribute to emulsion stability, the emulsion composition is called a Pickering emulsion even if it contains other surfactants. However, it is preferable that the sunscreen cosmetic of the present invention is substantially free of surfactants. The content of surfactant is preferably 1% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, based on the total amount of the sunscreen cosmetic, and most preferably none is contained.

[0042] As the particles that contribute to the emulsion stability of the Pickering emulsion, either organic particles or inorganic particles can be used. In the present invention, it is preferable to use metal oxide particles. The metal oxides referred to here also include oxides of metalloids such as silicon. Examples of metal oxide particles include silica, titanium dioxide, zinc oxide, iron oxide, zirconium oxide, and cerium oxide. In the present invention, it is preferable to use (C) silica-based fine particles.

[0043] When silica-based fine particles are used, either so-called dry silica particles produced by vapor phase oxidation of silicon halide or so-called wet silica particles produced from water glass or the like may be used. Examples of dry silica particles that can be used include the Aerosil series (Nippon Aerosil Co., Ltd.), CAB-O-SIL series (Cabot Corporation), and HDK series (Wacker Asahi Kasei Silicone Co., Ltd.), and examples of wet silica powders that can be used include commercially available products such as the Nipsil series (Tosoh Silica Corporation) and HI-SIL series (PPG).

[0044] Many other metal oxide powders are also commercially available, and commercially available products can be used as they are. Specific examples of such commercially available products include fine particle titanium dioxide, such as "MTY-110M3S" (manufactured by Teika Corporation), "MTY-02" (manufactured by Teika Corporation), "MT-100TV" (manufactured by Teika Corporation), "MT-500HSA" (manufactured by Teika Corporation), "MT-100T" (manufactured by Teika Corporation), "MT-01" (manufactured by Teika Corporation), "MT-10EX" (manufactured by Teika Corporation), "MT-05" (manufactured by Teika Corporation), "MT-100Z" (manufactured by Teika Corporation), "MT-150EX" (manufactured by Teika Corporation), "MT-100AQ" (manufactured by Teika Corporation), "MT-100WP" (manufactured by Teika Corporation), and Examples of suitable sintering agents include "MT-100SA" (manufactured by Teika Corporation), "MT-500B" (manufactured by Teika Corporation), "MT-500SA" (manufactured by Teika Corporation), "MT-600B" (manufactured by Teika Corporation), "MT-500SAS" (manufactured by Teika Corporation), "Tipaque CR-50" (manufactured by Ishihara Sangyo Kaisha), "Tipaque TTO-M-1" (manufactured by Ishihara Sangyo Kaisha), "Tipaque TTO-V4" (manufactured by Ishihara Sangyo Kaisha), "ST-455" (manufactured by Titanium Kogyo Co., Ltd.), "STT-65C-S" (manufactured by Titanium Kogyo Co., Ltd.), "STT-30EHS" (manufactured by Titanium Kogyo Co., Ltd.), and "Bayer Titanium R-KB-1" (manufactured by Bayer).

[0045] Examples of fine particle zinc oxide include "MZ-300" (manufactured by Teika Corporation), "MZY-303S" (manufactured by Teika Corporation), "MZ-306X" (manufactured by Teika Corporation), "MZ-500" (manufactured by Teika Corporation), "MZY-505S" (manufactured by Teika Corporation), "MZ-506X" (manufactured by Teika Corporation), "MZ-510HPSX" (manufactured by Teika Corporation), "WSX-MZ-700" (manufactured by Teika Corporation), "SANT-UFZO-450" (manufactured by Miyoshi Chemicals Co., Ltd.), "SANT-UFZO-500" (manufactured by Miyoshi Chemicals Co., Ltd.), "FZO-50" (manufactured by Ishihara Sangyo Kaisha), "Maxlite ZS-032" (manufactured by Showa Denko K.K.), and "Maxlite ZS-032D" (manufactured by Showa Denko K.K.). The surfaces of the metal oxide particles are preferably hydrophobized. The hydrophobized metal oxide particles can be prepared by reacting the metal oxide particles with a hydrophobizing agent to add hydrophobic groups to hydroxyl groups present on the surfaces of the powder through covalent bonds, or by physically attaching the hydrophobizing agent to the surfaces of the metal oxide particles to coat them.

[0046] The hydrophobic treatment may be carried out by treating the metal oxide powder with a hydrophobic treatment agent such as an organosilicon compound, silicone, hydrocarbon oil, fatty acid, fatty acid amide, fatty acid ester, higher alcohol, or polyoxyalkylene compound. It is particularly preferred to treat the metal oxide particles with an organosilicon compound or silicone as a hydrophobic treatment agent.

[0047] Examples of organosilicon compounds include hexamethyldisilazane, monomethylsilane, dimethylsilane, trimethylsilane, trimethylethoxysilane, isobutyltrimethoxysilane, trimethylchlorosilane, dimethyldichlorosilane, methyltrichlorosilane, dimethylethoxysilane, dimethyldimethoxysilane, diphenyldiethoxysilane, hexamethyldisiloxane, palmitylsilane, etc. These may be used alone or in combination of two or more.

[0048] In a preferred embodiment of the present invention, hydrophobic metal oxide particles are used, in which metal oxide particles are treated with trimethylsilane and trimethylsilyl groups are added to the surface thereof, and particularly preferably, partially hydrophobic silica is used, in which silica particles are treated with trimethylsilane and trimethylsilyl groups are added to the surface thereof.

[0049] When silicone is used as the hydrophobic treatment agent, examples include dimethyl silicone, methylphenyl silicone, α-methylstyrene-modified silicone, chlorophenyl silicone, and fluorine-modified silicone.

[0050] There are no particular limitations on the average primary particle size of the metal oxide particles, and it can be, for example, 1 to 1000 nm, preferably 3 to 100 nm, and more preferably 5 to 30 nm.

[0051] The average secondary particle size of the metal oxide particles is not particularly limited, but is preferably 1 μm or less, more preferably 500 nm or less, even more preferably 200 nm or less, and even more preferably 50 nm or less.

[0052] Here, the average primary particle size and average secondary particle size can be determined by measuring the maximum diameters of 2500 or more particles on a scanning electron microscope image and calculating the number average. The average secondary particle size can be adjusted by the stress applied during preparation of the topical composition.

[0053] The lower limit of the particle content is not particularly limited, but is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. The upper limit of the particle content is not particularly limited, but is preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2% by mass or less.

[0054] The emulsion form of the sunscreen cosmetic of the present invention is not particularly limited, and may be a W / O type or an O / W type.

[0055] The oil phase in the sunscreen cosmetic of the present invention may contain an oily base other than the above-mentioned ester oil. Examples of oily bases include liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, and silicone oils.

[0056] Examples of liquid oils and fats 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, meadowfoam oil, soybean oil, peanut oil, tea seed oil, Japanese kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, triglycerin, glycerin trioctanoate, and glycerin triisopalmitate.

[0057] Examples of solid fats and oils include cacao butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef foot fat, Japan wax, and hardened castor oil.

[0058] Waxes include beeswax, candelilla wax, cotton wax, carnauba wax, and bayberry wax. Examples of suitable lanolins include lanolin wax, ivory wax, spermaceti wax, montan wax, bran wax, lanolin, kapok wax, acetated lanolin, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0059] Examples of hydrocarbon oils include liquid paraffin, ozokerite, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0060] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, 12-hydroxystearic acid, undecylenic acid, and tall acid.

[0061] Examples of higher alcohols include cetyl alcohol, stearyl alcohol, behenyl alcohol, batyl alcohol, myristyl alcohol, and cetostearyl alcohol.

[0062] Examples of silicone oils include chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and diphenylsiloxyphenyltrimethicone, and cyclic polysiloxanes such as pentasiloxane, decamethylpolysiloxane, dodecamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane.

[0063] The aqueous phase in the Pickering emulsion of the present invention can contain any component typically used in cosmetics without any particular limitation, but it is preferable that it contains, for example, the following components: Examples of polyols include polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4-hexylene glycol, 1,2-hexanediol, and 1,2-octanediol, and among these, glycerin, 1,3-butylene glycol, and sorbitol are preferred.

[0064] The composition may also contain a thickener, such as xanthan gum, gellan gum, guar gum, quince seed, carrageenan, galactan, gum arabic, pectin, mannan, starch, curdlan, methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methylhydroxypropyl cellulose, chondroitin sulfate, dermatan sulfate, glycogen, heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratan sulfate, chondroitin, mucoitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, dextran, keratosulfuric acid, locust bean gum, succinoglucan, caronic acid, chitin, chitosan, carboxymethyl chitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, sodium polyacrylate, polyethylene glycol, sodium acrylate-grafted starch, stearoxyhydroxypropylmethylcellulose, or bentonite.

[0065] In addition to the above-mentioned components, the sunscreen cosmetic of the present invention may contain optional components commonly used in cosmetics to the extent that the effects of the invention are not impaired. Examples of such optional components include anionic surfactants such as fatty acid soaps (sodium laurate, sodium palmitate, etc.), potassium lauryl sulfate, and alkyl sulfate triethanolamine ethers; cationic surfactants such as stearyltrimethylammonium chloride, benzalkonium chloride, and laurylamine oxide; imidazoline-based amphoteric surfactants (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); betaine-based surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), amphoteric surfactants such as acylmethyl taurine, sorbitan fatty acid esters (sorbitan monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (glycerin monostearate, etc.), propylene glycol fatty acid esters (propylene glycol monostearate, etc.), hydrogenated castor oil derivatives, glycerin alkyl ether, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbitan POE fatty acid esters (POE-sorbitol monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE 2-octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonylphenyl ether, etc.), Pluronic (registered trademark) types, POE·POP alkyl ethers (POE·POP 2-decyltetradecyl ether, etc.), etc.), Tetronics, POE castor oil / hydrogenated castor oil derivatives (POE castor oil, POE hydrogenated castor oil etc.), sucrose fatty acid esters, nonionic surfactants such as alkyl glucosides, moisturizing ingredients such as sodium pyrrolidone carboxylate, lactic acid, sodium lactate, powders such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, barium sulfate etc. which may be surface-treated, inorganic pigments such as ultramarine and iron blue etc. which may be surface-treated, composite pigments such as sintered iron oxide and titanium dioxide etc.Pearling agents such as titanium dioxide, fish phosphate foil, and bismuth oxychloride, which may be surface-treated; organic pigments such as Red No. 202, Red No. 228, Red No. 226, Yellow No. 4, Blue No. 404, Yellow No. 5, Red No. 505, Red No. 230, Red No. 223, Orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green No. 201, Purple No. 201, and Red No. 204, which may be laked; organic powders such as polyethylene powder, polymethyl methacrylate, nylon powder, and organopolysiloxane elastomer; Preferred examples of the vitamin B12 include lower alcohols such as ethanol and isopropanol, vitamin A or a derivative thereof, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or a derivative thereof, vitamin B12, vitamin B15 or a derivative thereof, vitamin E such as α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E acetate, vitamin D, vitamin H, pantothenic acid, pantethine, pyrroloquinoline quinone, and the like.

[0066] The sunscreen cosmetic of the present invention can be produced by dispersing emulsifying particles in an aqueous phase, mixing the resulting dispersion with an oily phase, and emulsifying the resulting dispersion. [Example]

[0067] Test Example 1: Preparation of sunscreen cosmetics According to the formulations shown in Table 1, sunscreen cosmetics, which are O / W Pickering emulsions of Examples 1 to 3 and Comparative Examples 1 to 3, were prepared.

[0068] <Test Example 2> Measurement of SPF value Each sunscreen cosmetic was applied to an SPF analyzer measurement PMMA HD6 plate at a concentration of 2 mg / cm2 and allowed to dry for 10 minutes. The SPF value was then calculated using an SPF analyzer (UV2000, manufactured by Labspire). The results are shown in Table 1.

[0069] <Test Example 3> Evaluation test of stickiness, smoothness during application, and emulsion stability Each sunscreen cosmetic thus prepared was applied to the forearm, and the stickiness and smoothness upon application were evaluated. Furthermore, each sunscreen cosmetic was left to stand at 60°C for two weeks, and the emulsion stability was evaluated. The evaluations were made according to the following criteria, and the results are shown in Table 1.

[0070] <Evaluation criteria> (sticky feeling) ◎ (Example) No stickiness at all 〇···(Example) I don't mind stickiness △ Stickiness is a concern ×: Sticky and uncomfortable when applied (Smoothness when applied) ◎ Smooth spread with no resistance 〇···Smoothly spreads, but there is some resistance △···It does not stretch smoothly and there is some resistance. ×...It does not spread smoothly and there is an unpleasant resistance when applying it. Emulsion stability 〇 60℃ Even after leaving it for 2 weeks, the emulsified state does not change and no oil floating is observed. × When left at 60°C for 2 weeks, the emulsion droplets coalesced and oil floated on top.

[0071] [Table 1]

[0072] From the results of Comparative Example 1, the extensibility was 550 (mm 2 It was found that sunscreen cosmetics in the form of Pickering emulsions that do not contain ester oils (amount of application time of 10 min or less) have a strong sticky feeling and lack smoothness when applied. A comparison between Comparative Example 1 and Comparative Example 2 revealed that stickiness and smoothness during application could be improved by reducing the content of the solid ultraviolet absorber and sacrificing the SPF value. A comparison of Comparative Example 1 and Comparative Example 3 revealed that the addition of silicone oil can improve to some extent the stickiness and lack of smoothness during application that are caused by the solid UV absorber, but significantly reduces emulsion stability.

[0073] Comparison of Examples 1 to 4 with Comparative Example 1 reveals that by blending the ester oil (B-1) and / or the ester oil (B-2) together with a solid UV absorber, a sunscreen cosmetic can be obtained that is smooth to the touch upon application without the stickiness associated with the solid UV absorber, even when the content of the solid UV absorber is high, i.e., while maintaining a high SPF value. Furthermore, the sunscreen cosmetics of Examples 1 to 4 had excellent emulsion stability. [Industrial Applicability]

[0074] The present invention can be applied to a variety of UV care products.

Claims

[Claim 1] (A) an ultraviolet absorber that is solid at room temperature; (B) an ester oil, The content of the (A) ultraviolet absorber that is solid at room temperature is 4.5% by mass or more, the total amount of all ultraviolet absorbers relative to the total amount of the sunscreen cosmetic is 12 mass% or more; The (B) ester oil is (B-1) an ester oil that is solid at room temperature, and (B-2) an ester oil having a spreadability of 550 (mm ２ / 10 min) or less, the content of the ester oil (B-2) relative to 1 part by mass of the ester oil (B-1) is 7 to 15 parts by mass, the total content of the ester oil (B-1) and the ester oil (B-2) is 3 to 8% by mass based on the total amount of the sunscreen cosmetic; It is an O / W type Pickering emulsion. Sunscreen cosmetics. (Measurement method) At room temperature, 4 mg of the ester oil to be measured and 4 mg of the standard tetradecanoate were dropped onto the forearm, and the area (mm ２ ) is measured, and the spreadability of the ester oil is calculated by the following formula 1. (Formula 1) (Diameter of measurement object) = (area of ​​measurement object / area of ​​standard product) × 780

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