JP2006335654A - Ultraviolet-shielding cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet-shielding cosmetic containing 2-ethylhexyl p-methoxycinnamate that has canceled unpleasant odor characteristic of cosmetics obtained by using 2-ethylhexyl p-methoxycinnamate. <P>SOLUTION: The ultraviolet-shielding cosmetic comprises 1-80 mass% of zinc oxide particles having a layer covered with high density silica, and 2-ethylhexyl p-methoxycinnamate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an ultraviolet shielding cosmetic.

In order to prevent the harmful effects of ultraviolet rays on the skin and the human body by protecting the ultraviolet rays, and to prevent the harmful effects of cosmetics caused by the darkening of the skin, ultraviolet shielding ultraviolet-shielding cosmetics are used. ing. In such UV-blocking UV-blocking cosmetics, organic UV absorbers such as benzophenone-based, benzoic acid-based, and methoxycinnamic acid-based are used.

Among these organic ultraviolet absorbers, 2-ethylhexyl paramethoxycinnamate having particularly suitable properties is widely used. However, since 2-ethylhexyl paramethoxycinnamate manufactured and sold industrially has a peculiar unpleasant odor, the UV screening cosmetic containing paramethoxycinnamate 2-ethylhexyl has an unpleasant odor. There is a drawback.

On the other hand, inorganic pigments such as titanium oxide and zinc oxide are also used as ultraviolet absorbers. These inorganic pigments were blended in order to improve the ultraviolet absorbing ability by the ultraviolet absorbing ability of the inorganic pigment itself.

Patent Document 1 describes a zinc oxide particle composition having a high-density coating layer made of silicon oxide on the surface. However, in Cited Document 1, in order to suppress the photocatalytic activity in zinc oxide particles, particularly ultrafine zinc oxide, it is intended to solve the above-mentioned problem in 2-methoxyhexyl paramethoxycinnamate. It was not what I did.

Japanese Patent Laid-Open No. 11-302015

In view of the above, the present invention provides a UV-shielding cosmetic containing 2-ethylhexyl paramethoxycinnamate, which eliminates the unpleasant odor peculiar to cosmetics using 2-methoxyhexyl paramethoxycinnamate. It is for the purpose.

The present invention is an ultraviolet screening cosmetic containing 1 to 80% by mass of zinc oxide particles having a high-density silica coating layer and 2-ethylhexyl paramethoxycinnamate.
The zinc oxide particles preferably have an average particle size of 0.15 μm or less.
The zinc oxide particles preferably have a solubility in pure water of 2 ppm or less as Zn and a solubility in 0.0005 mass% sulfuric acid aqueous solution of 20 ppm or less as Zn.
The zinc oxide particles are preferably those whose surface is further treated with an organopolysiloxane in the range of 1 to 20% by mass with respect to zinc oxide.
The high-density silica coating layer preferably has an aluminum oxide / silicon oxide (mass ratio) of 0.5 or less.
The present invention is described in detail below.

The unpleasant odor peculiar to 2-ethylhexyl paramethoxycinnamate manufactured and sold industrially is generally the odor of 2-ethylhexanol contained as an impurity in 2-ethylhexyl paramethoxycinnamate. Known to. Therefore, if transpiration of 2-ethylhexanol at the time of cosmetic use can be prevented, it is expected that the problem of odor in the ultraviolet screening cosmetic containing 2-methoxyhexyl paramethoxycinnamate can be improved.

The present invention has been completed by finding that the above-mentioned problems are solved by using zinc oxide particles having a high-density silica coating layer on the particle surface in combination with 2-ethylhexyl paramethoxycinnamate. It is. The surface of zinc oxide particles coated with high-density silica coating has a high solid acidity, and transpiration is caused by the strong adsorption of 2-ethylhexanol in a form that neutralizes the acid sites with high acidity. It is estimated that the odor of 2-ethylhexyl paramethoxycinnamate is improved.

The high-density silica coating layer is a silica layer formed more densely than usual on the surface of zinc oxide particles, and formed with a high density enough to sufficiently suppress the surface activity of zinc oxide and elution of zinc compounds. It is preferable. As such a high-density silica coating layer, for example, a coating layer (coating layer 1) formed by adding a water-soluble silicate to an aqueous suspension of zinc oxide particles and neutralizing it by adding an acid thereto. ), Formed by adding water-soluble silicate and acid simultaneously while maintaining basicity in an aqueous suspension of zinc oxide particles and then neutralizing the suspension by adding acid. Examples thereof include a coating layer (coating layer 2).

In forming the coating layer 1, first, a water-soluble silicate is added to zinc oxide in an aqueous suspension of zinc oxide particles. The concentration of the zinc oxide particles in the aqueous suspension is preferably in the range of 50 to 250 g / L. It does not specifically limit as said water-soluble silicate, For example, sodium silicate, potassium silicate, etc. can be used. The addition amount of the water-soluble silicate is preferably 1 to 50 mass% as SiO ₂ with respect to zinc oxide. Moreover, it is preferable that the zinc oxide particles are sufficiently pulverized with a pulverizer such as a sand mill before the treatment.

In the subsequent neutralization step, a silica coating layer is formed by gradually adding an acid to the aqueous suspension for neutralization. The neutralization step is preferably performed by adding the acid over a period of 40 minutes or more while maintaining the temperature of the suspension at 60 ° C or higher. Neutralization is preferably performed until the pH is in the range of 6.0 to 8.0. It does not specifically limit as an acid used for the said neutralization, For example, inorganic acids, such as a sulfuric acid, organic acids, such as an acetic acid and an oxalic acid, etc. can be used.

In the formation of the coating layer 1, the temperature condition in the neutralization step and the time condition (time width) for adding the neutralizing agent are important. That is, while maintaining the temperature of the suspension in this step at 60 ° C. or higher, preferably 80 ° C. or higher, a neutralizing agent is added over a period of 40 minutes or longer, preferably 60 minutes or longer, so that the pH is It is preferred to neutralize the suspension to the range of 6.0 to 8.0.

In forming the coating layer 2, first, a water-soluble silicate and an acid are added to an aqueous suspension of zinc oxide particles. The concentration of the zinc oxide particles in the aqueous suspension is preferably in the range of 50 to 250 g / L. It does not specifically limit as said water-soluble silicate, For example, sodium silicate, potassium silicate, etc. can be used. The addition amount of the water-soluble silicate is preferably 1 to 50 mass% as SiO ₂ with respect to zinc oxide. The addition is preferably performed while maintaining the temperature at 60 ° C. or higher and the pH in the range of 9 to 10.5, and simultaneously adding over 40 minutes or more. The addition temperature is more preferably 80 ° C. or more, and the addition time is more preferably 60 minutes or more.

In the subsequent neutralization step, a silica coating layer is formed by adding an acid to the aqueous suspension for neutralization. The neutralization step is preferably performed until the pH is in the range of 6.0 to 8.0. It does not specifically limit as an acid used for the said neutralization, For example, inorganic acids, such as a sulfuric acid, organic acids, such as an acetic acid and an oxalic acid, etc. can be used.

The zinc oxide particles having the high-density silica coating layer preferably have a coating layer in the range of 1 to 50% by mass with respect to zinc oxide on the surface of the zinc oxide particles. Further, the solubility in pure water is preferably 2 ppm or less as Zn, and the solubility in 0.0005 mass% sulfuric acid aqueous solution is preferably 20 ppm or less as Zn.

The zinc oxide particles used in the present invention preferably have an average primary particle size of 0.15 μm or less. If the average primary particle diameter of the zinc oxide particles is larger than 0.15 μm, the hiding power is large, so that the transparency is low, and it may become white when applied on the skin as a cosmetic. The lower limit of the average primary particle diameter of the zinc oxide particles is not particularly limited, but is preferably 0.01 μm or more. Here, the average primary particle diameter is defined by a constant direction diameter (so-called FERET diameter) in a field of view of 100,000 times that of a transmission electron micrograph.

The zinc oxide particles having a high-density silica coating layer on the particle surface may further have an alumina layer on the high-density silica coating layer. However, even in this case, it is preferable to use the aluminum oxide in such a ratio that the aluminum oxide / silicon oxide (mass ratio) is 0.5 or less. When the ratio is more than 0.5, the adsorption ability of the silica is lowered, so that the object of the present invention of improving odor may not be sufficiently achieved. The formation of the alumina layer can be performed by adding a water-soluble aluminum compound to a suspension of zinc oxide particles having a high-density silica coating layer, and neutralizing by adding an acid or base. The water-soluble compound of aluminum is not particularly limited, and examples thereof include aluminum nitrate, aluminum sulfate, and sodium aluminate. However, in order to realize the effect of reducing the odor at the highest level, it is preferable that the material does not substantially have an alumina coating layer.

The zinc oxide particles having the high-density silica coating layer may be those obtained by further subjecting the high-density silica coating layer to surface treatment with organopolysiloxane. By performing the surface treatment with the above organopolysiloxane, it is possible to improve the dispersibility of the oil in the ultraviolet shielding cosmetic and the water repellency. In the surface treatment, it is preferable that the organopolysiloxane is usually attached in a range of 1 to 20% by mass with respect to zinc oxide. Preferably, it is the range of 3-10 mass%. When the organopolysiloxane is less than 1% by mass with respect to zinc oxide, the effect of improving the dispersibility of the oil in the UV screening cosmetic is poor. Since dispersibility in oils in cosmetics and water repellency are saturated, it is economically disadvantageous. Examples of the organopolysiloxane include dimethylpolysiloxane and methylhydrogenpolysiloxane.

A commercially available thing can also be used as a zinc oxide particle which has the said high-density silica coating layer. As a commercially available thing, FINEX-50W-LP2 (made by Sakai Chemical Industry Co., Ltd.) etc. can be mentioned, for example.

The zinc oxide particles according to the present invention are blended in the ultraviolet shielding cosmetic in the range of 1 to 80% by mass. When the blending amount is less than 1% by mass, the problem of odor improvement is not sufficiently solved, and when 80% by mass or more is blended, it may be difficult to maintain the stability of the cosmetic. The lower limit is more preferably 5% by mass, and the upper limit is more preferably 50% by mass.

The ultraviolet screening cosmetic of the present invention further comprises 2-ethylhexyl paramethoxycinnamate. Industrially produced 2-ethylhexyl paramethoxycinnamate contains a trace amount of 2-ethylhexanol as an impurity. Commercially available 2-ethylhexyl paramethoxycinnamate includes Eusolex 2292 (Merck), Parsol MCX (Roche), Neoheliopan AV (Herman and Reimer), Escalol 557 (ISP Household and Specialties) ), Uvinul MC80 (manufactured by BASF) and the like. These all contain a trace amount of 2-ethylhexanol as impurities. Although the compounding quantity of 2-ethylhexyl paramethoxycinnamate is not specifically limited, It is preferable that they are 2 mass% or more and 10 mass% or less with respect to the composition whole quantity.

The ultraviolet shielding cosmetic of the present invention preferably further contains volatile silicone oil. The zinc oxide particles surface-treated with the high-density silica coating layer and the organopolysiloxane can be used in combination with the volatile silicone oil to make a cosmetic material with excellent dispersibility. It does not specifically limit as volatile silicone oil, For example, well-known things, such as decamethylcyclopentasiloxane and octamethylcyclotetrasiloxane, can be used. These can be used alone or in any combination of two or more. In the ultraviolet shielding cosmetic of the present invention, such a volatile silicone oil can be blended in an amount of 5 to 70% by mass, preferably 10 to 40% by mass, based on the total amount of the composition.

The ultraviolet shielding cosmetic of the present invention may be used in combination with any aqueous component or oily component that can be used in the cosmetic field in addition to the components constituting the above mixture. The aqueous component and the oil component are not particularly limited, and examples thereof include oils, surfactants, humectants, higher alcohols, sequestering agents, natural and synthetic polymers, water-soluble and oil-soluble polymers, ultraviolet absorbers, Various extracts, inorganic and organic pigments, inorganic and organic clay minerals, inorganic and organic pigments treated with metal soaps or silicones, organic dyes and other colorants, preservatives, antioxidants, pigments, thickeners, pH You may contain components, such as a regulator, a fragrance | flavor, a cooling agent, an antiperspirant, a disinfectant, a skin activator. Specifically, it is possible to produce one or more UV shielding cosmetics according to a conventional method by arbitrarily blending one or more of the blending components listed below. The compounding amounts of these compounding components are not particularly limited as long as the effects of the present invention are not impaired.

The oil content is not particularly limited. For example, 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, sasanqua oil, castor Oil, flaxseed oil, safflower oil, cottonseed oil, eno oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnagari oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin, glycerin trioctanoate, Glycerin triisopalmitate, cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, hydrogenated beef tallow, palm kernel oil, pork tallow, beef bone oil, owl kernel oil, hydrogenated oil, cow leg Fat, Owl, Hardened castor oil, Beeswax, Candelilla wax, Cotton wax, Carnauba wax, Bayberry wax, Ibotaro, Whale wax, Montan wax, Nukarou, Norin, Kapok wax, Lanolin acetate, Liquid lanolin, Sugar cane wax, Lanolin fatty acid isopropyl, Hexyl laurate, Reduced lanolin, Jojo wax, Hard lanolin, Shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol POE hydrogenated lanolin alcohol ether, liquid paraffin, ozokerite, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax and the like.

The lipophilic nonionic surfactant is not particularly limited. For example, sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate Sorbitan fatty acid esters such as diglycerol sorbitan tetra-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, mono-cotton oil fatty acid glycerin, glyceryl monoerucate, glyceryl sesquioleate, glyceryl monostearate, α, α ' -Glycerol polyglycerin fatty acids such as glyceryl oleate, glyceryl monooleate, glyceryl monostearate, and propylene glycol such as propylene glycol monostearate Examples include recall fatty acid esters, hardened castor oil derivatives, and glycerin alkyl ethers.

The hydrophilic nonionic surfactant is not particularly limited. For example, POE sorbitan fatty acid esters such as POE sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, POE sorbite fatty acid esters such as POE-sorbite monolaurate, POE-sorbite monooleate, POE-sorbite pentaoleate, POE-sorbite monostearate, POE-glycerol monostearate, POE-glycerol monoisostearate, POE glycerol fatty acid esters such as POE-glycerin triisostearate, POE monooleate, POE distearate, POE monodiolate, PO such as ethylene glycol stearate Fatty acid esters, POE lauryl ether, POE oleyl ether, POE stearyl ether, POE behenyl ether, POE2-octyldodecyl ether, POE alkyl ethers such as POE cholestanol ether, POE octyl phenyl ether, POE nonyl phenyl ether, POE dinonyl POE alkyl phenyl ethers such as phenyl ether, pluronic types such as brulonic, POE / POP cetyl ether, POE / POP2-decyltetradecyl ether, POE / POP monobutyl ether, POE / POP hydrogenated lanolin, POE / POP glycerin ether POE / POP alkyl ethers such as Tetronic, Tetra POE / Tetra POP ethylenediamine condensates such as Tetronic, POE Castor POE hydrogenated castor oil, POE hydrogenated castor oil monoisostearate, POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyroglutamic acid monoisostearic acid diester, POE hydrogenated castor oil maleic acid, etc. Derivatives, POE beeswax / lanolin derivatives such as POE sorbite beeswax, alkanolamides such as coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, POE propylene glycol fatty acid ester, POE alkylamine, POE fatty acid amide, sucrose fatty acid Examples thereof include esters, POE nonylphenyl formaldehyde condensates, alkylethoxydimethylamine oxide, trioleyl phosphoric acid and the like.

Examples of other surfactants include anionic surfactants such as fatty acid soaps, higher alkyl sulfates, POE lauryl sulfate triethanolamine, alkyl ether sulfates, alkyltrimethylammonium salts, alkylpyridinium salts, alkyl quaternary salts. Stabilizes cationic surfactants such as ammonium salts, alkyldimethylbenzylammonium salts, POE alkylamines, alkylamine salts, polyamine fatty acid derivatives, and amphoteric surfactants such as imidazoline-based amphoteric surfactants and betaine-based surfactants. And you may mix | blend in the range which does not have a problem in skin irritation.

The moisturizing agent is not particularly limited, and examples thereof include xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salt, dl- Examples thereof include pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO) PO adduct, Isaiyobara extract, Achillea millefolium extract, and Merirot extract.

The higher alcohol is not particularly limited, and examples thereof include linear alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, monostearyl glycerin ether (batyl alcohol), 2-decyl. Examples thereof include branched chain alcohols such as tetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, and the like.

The sequestering agent is not particularly limited. For example, 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, sodium citrate, sodium polyphosphate, metaphosphoric acid Examples thereof include sodium, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid and the like.

The natural water-soluble polymer is not particularly limited. For example, arabia gum, tragacanth gum, galactan, guar gum, carob gum, caraya gum, carrageenan, pectin, agar, quince seed (malmello), alge colloid (guckweed extract), starch (rice, rice, Corn, potato, wheat), plant polymers such as glycyrrhizic acid, microbial polymers such as xanthan gum, dextran, succinoglucan and pullulan, and animal polymers such as collagen, casein, albumin and gelatin. .

The semi-synthetic water-soluble polymer is not particularly limited. For example, starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch, methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, Examples thereof include cellulose polymers such as hydroxypropylcellulose, sodium carboxymethylcellulose (CMC), crystalline cellulose, and cellulose powder, and alginic acid polymers such as sodium alginate and propylene glycol alginate.

The synthetic water-soluble polymer is not particularly limited, and examples thereof include vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, and polyvinyl pyrrolidone, and polyoxyethylene polymers such as polyethylene glycol 20,000, 40,000, and 60,000. Examples thereof include polymers, polyoxyethylene polyoxypropylene copolymer copolymer polymers, acrylic polymers such as sodium polyacrylate, polyethyl acrylate and polyacrylamide, polyethyleneimine, and cationic polymers.

The inorganic water-soluble polymer is not particularly limited, and examples thereof include bentonite, silicate A1Mg (beegum), laponite, hectorite, and silicic anhydride.

The ultraviolet absorber is not particularly limited. For example, paraaminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N, N-dipropoxy PABA ethyl ester, N, N-diethoxy PABA ethyl ester, N, N-dimethyl Benzoic acid UV absorbers such as PABA ethyl ester and N, N-dimethyl PABA butyl ester; Anthranilic acid UV absorbers such as homomenthyl-N-acetylanthranilate; Amil salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate , Salicylic acid ultraviolet absorbers such as phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate; octylcinnamate, ethyl-4-isopropylcinnamate, methyl-2,5- Isopropyl cinnamate, ethyl-2,4-diisopropyl cinnamate, methyl-2,4-diisopropyl cinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, 2- Ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexa Cinnamic acid UV absorbers such as noyl-diparamethoxycinnamate; 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone , 2, 2 ', 4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4 -Benzophenone ultraviolet absorbers such as phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone; (4'-methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor, urocanic acid, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy- 5-methylphenylbenzoto Riazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenylbenzotriazole), dibenzalazine, dianisoylmethane, 4-methoxy-4′- Examples thereof include t-butyldibenzoylmethane and 5- (3,3-dimethyl-2-norbornylidene) -3-pentan-2-one.

Other drug components are not particularly limited and include, for example, vitamin A oil, retinol, retinol palmitate, inosit, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, nicotinic acid DL-α-tocopherol, magnesium ascorbate phosphate, 2 Vitamins such as -O-α-D-glucopyranosyl-L-ascorbic acid, vitamin D2 (ergocaciferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, biotin; estradiol, ethinylestradiol, etc. Hormones; amino acids such as arginine, aspartic acid, cystine, cysteine, methionine, serine, leucine and tryptophan; anti-inflammatory agents such as allantoin and azulene; whitening agents such as arbutin; zinc oxide and tannic acid斂剤; L-menthol, breath fresheners or sulfur camphor, lysozyme chloride, can be mentioned pyridoxine chloride.

There are no particular limitations on the various extracts, for example, Dokudami extract, Oat extract, Merirot extract, Odorikosou extract, Licorice extract, Peonies extract, Soap extract, Loofah extract, Kina extract, Yukinoshita extract, Clara extract, Kouhone extract, Fennel Extract, Primrose Extract, Rose Extract, Giant Extract, Lemon Extract, Shikon Extract, Aloe Extract, Shobu Root Extract, Eucalyptus Extract, Horsetail Extract, Sage Extract, Thyme Extract, Tea Extract, Seaweed Extract, Cucumber Extract, Clove Extract, Raspberry Extract, Melissa Extract , Carrot extract, horse chestnut extract, peach extract, peach leaf extract, mulberry extract, cornflower extract, hamamelis extract, placenta extract, thymus extract, silk extract, licorice Mention may be made of the kiss and the like.

The ultraviolet screening cosmetics of the present invention can be used as cosmetics such as sunscreen cosmetics such as sunscreen agents, makeup bases, and foundations. Moreover, although it can be set as arbitrary forms of oil-based cosmetics, water-based cosmetics, O / W type cosmetics, and W / O type cosmetics, since water resistance is favorable, W / O type emulsified cosmetics It is preferable that Moreover, it can be set as arbitrary dosage forms, for example, powder, pressed powder, cake form, emulsion, solution form, gel form, etc.

The ultraviolet shielding cosmetic according to the present invention can eliminate unpleasant odors by mixing zinc oxide particles having a high-density coating layer made of silicon oxide with 2-ethylhexyl paramethoxycinnamate.

According to the present invention, it is possible to obtain an ultraviolet shielding cosmetic or the like in which a specific unpleasant odor due to 2-ethylhexyl paramethoxycinnamate is eliminated.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited only to these examples. In the examples, “parts” means “parts by mass” unless otherwise specified.

(Evaluation 1)
Stock solution of Uvinul MC-80 (manufactured by BASF) which is 2-ethylhexyl paramethoxycinnamate and zinc oxide FINEX-50W-LP2 = 1/2 (mass ratio) coated with Uvinul MC-80 / silica (26%) Two samples of the mixture were prepared. Twenty testers (10 males and 10 females) sniff the odor of each sample, and have one of the following choices selected: “○ Smells very weak or not △ Smell is weak × Smell is strong” It was. The results are shown in Table 1.

From the results in Table 1, it is clear that the odor of 2-ethylhexyl paramethoxycinnamate was significantly reduced by adding silica-coated zinc oxide.

(Preparation of emulsion)
Example 1
10 parts of powder, 27 parts of cyclic siloxane, 5 parts of isopropyl myristate, 20 parts of dimethicone, 3 parts of polyether-modified dimethicone and 5 parts of 2-ethylhexyl p-methoxycinnamate are dispersed in a homogenizer for 15 minutes. While stirring the liquid with a homogenizer, 30 parts of pure water was gradually added and further dispersed for 15 minutes to prepare an emulsion. In addition, the said powder gave the surface treatment shown in Table 3.
Example 2 and Comparative Examples 1 to 4
An emulsion was prepared in the same manner as in Example 1 except that the formulations shown in Tables 2 and 3 were changed.

(Evaluation 2)
The obtained emulsion was evaluated based on the following criteria.
20 panelists (10 males and 10 females) were asked to smell each of the sample emulsions, and the numbers were evaluated in order of strong smell (strongest 1 to 6). Sensory tests were performed by averaging the results from sample to sample. The results are shown in Table 4.

From the results in Table 4, it is apparent that the ultraviolet shielding cosmetic of the present invention has a reduced odor.

(Evaluation 3)
Zinc oxide particles shown in Table 5 below were added to and mixed with Uvinul MC-80 (manufactured by BASF), which is 2-ethylhexyl paramethoxycinnamate, at a ratio of Uvinul MC-80 / Zinc oxide = 1/2. Samples were prepared. About Uvinul MC-80 as a blank and each sample, GCmass measurement was performed and content of 2-ethylhexanol was measured. The results are shown in Table 5.

The GC Mass measurement was performed by the headspace method under the conditions shown in Table 6.

It was revealed that the amount of 2-ethylhexanol can be significantly reduced when zinc oxide having the above coating and 2-ethylhexyl paramethoxycinnamate are used in combination.

The ultraviolet shielding cosmetic of the present invention has a reduced odor, and can be used as an ultraviolet shielding cosmetic such as a sunscreen ultraviolet shielding cosmetic such as a sunscreen agent, a makeup base, and a foundation.

Claims (5)

An ultraviolet screening cosmetic comprising 1 to 80% by mass of zinc oxide particles having a high-density silica coating layer and 2-ethylhexyl paramethoxycinnamate. The ultraviolet shielding cosmetic according to claim 1, wherein the zinc oxide particles have an average particle size of 0.15 μm or less. The ultraviolet-shielding cosmetic composition according to claim 1 or 2, wherein the zinc oxide particles have a solubility in pure water of 2 ppm or less as Zn and a solubility in 0.0005 mass% sulfuric acid aqueous solution of 20 ppm or less as Zn. Fee. The ultraviolet shielding cosmetic according to claim 1, 2 or 3, wherein the zinc oxide particles are further treated with an organopolysiloxane having a surface in the range of 1 to 20 mass% with respect to zinc oxide. The ultraviolet shielding cosmetic according to claim 1, 2, 3, or 4, wherein the high-density silica coating layer has an aluminum oxide / silicon oxide (mass ratio) of 0.5 or less.