Spherical composite particles of barium sulfate and silica and cosmetics containing the same

Abstract

To provide spherical composite particles of barium sulfate and silica that give improvements in the feel of compounded cosmetics, the sedimentation resistance in emulsions and the drop strength of press formulations.SOLUTION: Spherical composite particles of barium sulfate and silica are characterized by being spherical composite particles surface-treated with two or more compounds selected from fatty acids and metal soaps.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to spherical composite particles of barium sulfate and silica, and to cosmetics containing the same. [Background technology]

[0002] Many cosmetics incorporate spherical particles to impart spreadability, high haze, scrubbing effects, and the like. These spherical particles can be broadly divided into those constructed from organic polymers (resins) such as nylon, polystyrene, and polyorganosilsesquioxanes, and those constructed from inorganic compounds such as silica and calcium carbonate. Recently, the so-called microplastic problem has become a hot topic, where spherical resin particles incorporated into cosmetics are released into the natural environment through sewage, concentrating harmful substances when plankton or fish ingest the resin particles that have adsorbed them. For this reason, active efforts are being made to develop powders and cosmetic formulations that utilize inorganic spherical particles that have a high specific gravity and therefore do not float easily in the ocean.

[0003] For example, Patent Document 1 proposes inorganic spherical particles for use in cosmetics, such as silica particles with excellent feel, smoothness, and dispersibility due to the presence of protrusions scattered across the entire surface of the spherical silica particles. Patent Document 2 also proposes a powder in which spherical calcium carbonate with an average particle diameter of 200 μm or less is treated with wax to improve adhesion to the skin and usability. Patent Document 3 also proposes spherical composite particles in which fine barium sulfate and silica are combined, proposing particles with superior mechanical strength and a high haze effect compared to particles composed of a single compound. It is described that these spherical composite particles of barium sulfate and silica are smooth yet moist, and that when incorporated into cosmetics, they can impart a unique feel to the skin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-080118 [Patent Document 2] JP 2019-172600 A [Patent Document 3] Japanese Patent Application Publication No. 2018-140921 Summary of the Invention [Problem to be solved by the invention]

[0005] The spherical composite particles of barium sulfate and silica described in Patent Document 3 were excellent particles with a moist feel and a high haze effect, but had the problem of being prone to settling when incorporated into emulsions, etc., due to their high specific gravity. Patent Document 3 also describes surface treatment with silicone or alkylsilane, but in the case of spherical composite particles surface-treated with these, there was also the problem of poor drop strength after press molding, possibly due to poor adhesion between particles.

[0006] In view of the above-mentioned current situation, an object of the present invention is to provide spherical composite particles of barium sulfate and silica that have improved feel in the cosmetic preparation to which they are blended, improved resistance to sedimentation in emulsions, and improved drop strength in pressed preparations. [Means for solving the problem]

[0007] As a result of extensive research, the present inventors have discovered that by subjecting spherical composite particles of barium sulfate and silica to a specific surface treatment, the feel of the incorporated cosmetic preparation, the resistance to sedimentation in emulsions, and the drop strength of pressed preparations can be improved.

[0008] That is, the present invention relates to spherical composite particles of barium sulfate and silica, characterized in that the spherical composite particles have been surface-treated with two or more compounds selected from fatty acids and metal soaps.

[0009] It is preferable that at least one of the compounds used in the surface treatment is a solid compound at 20°C, and at least one is a liquid compound at 20°C.

[0010] The mass ratio of the compound that is solid at 20° C. to the compound that is liquid at 20° C. used in the surface treatment is preferably 9:1 to 1:9.

[0011] The present invention also relates to a cosmetic containing the spherical composite particles of barium sulfate and silica of the present invention. [Effects of the Invention]

[0012] The spherical composite particles of barium sulfate and silica of the present invention provide an excellent feel to the cosmetic when blended into the cosmetic, and also have excellent sedimentation resistance in emulsions and drop strength of pressed formulations, making them suitable for use in cosmetics of various formulations. DETAILED DESCRIPTION OF THE INVENTION

[0013] Preferred embodiments of the present invention will be specifically described below, but the present invention is not limited to the following description and can be modified and applied as appropriate within the scope that does not change the gist of the present invention.

[0014] 1. Spherical composite particles of barium sulfate and silica The spherical composite particles of barium sulfate and silica of the present invention are characterized by being surface-treated with two or more compounds selected from fatty acids and metal soaps. The two or more compounds used in the surface treatment may all be fatty acids or all be metal soaps, or a fatty acid and a metal soap may be used in combination.

[0015] Any method can be used to prepare spherical composite particles of barium sulfate and silica before surface treatment, including the method described in JP 2018-140921 A. The ratio of barium sulfate to silica can also be determined arbitrarily, but to achieve a high haze effect, it is preferable for the barium sulfate content to be 55 to 99% by mass relative to the total of barium sulfate and silica. This results in favorable physical properties such as the strength, feel, and haze of the particles themselves. The proportion of barium sulfate is more preferably 70 to 98% by mass, and even more preferably 80 to 95% by mass, relative to the total of barium sulfate and silica.

[0016] The amount of the surface treatment with two or more compounds selected from fatty acids and metal soaps applied to the spherical composite particles of barium sulfate and silica is preferably 1 to 20 parts by mass per 100 parts by mass of the treated powder, regardless of the number of compounds used in the surface treatment. If the amount is less than 1 part by mass, the effect of the surface treatment will be too weak, and if the amount is more than 20 parts by mass, the high haze effect of the spherical composite particles will be reduced.

[0017] It is more preferable that at least one of the two or more compounds used in the surface treatment is a solid at 20°C and at least one is a liquid at 20°C. Surface treatment with a solid fatty acid or metal soap at 20°C can give cosmetics containing the spherical composite particles a pleasant feel. Surface treatment with a liquid fatty acid or metal soap at 20°C can also give the spherical composite particles excellent affinity for lipophilic liquids and excellent dispersibility in liquid cosmetics. By using both of these as two or more compounds used for surface treatment, greater effects can be obtained than when each compound is used alone.

[0018] Examples of fatty acids that are solid at 20°C include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and eicosapentaenoic acid. Examples of metal soaps that are solid at 20°C include zinc stearate, aluminum stearate, calcium stearate, magnesium stearate, zinc myristate, aluminum myristate, calcium myristate, magnesium myristate, zinc palmisate, aluminum palmisate, magnesium palmisate, calcium palmisate, zinc laurate, aluminum laurate, calcium laurate, magnesium laurate, zinc palmitate, aluminum palmitate, calcium palmitate, magnesium palmitate, and the like. Furthermore, examples of fatty acids that are liquid at 20°C include isostearic acid, oleic acid, linoleic acid, linolenic acid, and docosahexaenoic acid. Examples of metal soaps that are liquid at 20°C include zinc octylate. Among these, it is preferable to select one or more of lauric acid, myristic acid, palmitic acid, stearic acid, or metal salts thereof, which are solid at 20° C., and it is also preferable to select isostearic acid, which is liquid at 20° C. By doing so, spherical composite particles with little concern about odor, skin irritation, etc. can be obtained.

[0019] The mass ratio of the compound that is solid at 20°C to the compound that is liquid at 20°C is preferably between 1:9 and 9:1, more preferably between 3:7 and 7:3, and even more preferably between 4:6 and 6:4. If either is too much, the effects of improving sedimentation resistance and drop strength will be the same as when only solid or liquid compounds at 20°C are used.

[0020] The surface treatment method may be any method that does not destroy the spherical composite particles, such as a method of mixing with a high-speed mixer to uniformly adhere the agent to the particle surface, or a method of dispersing the spherical composite particles in a solvent and then adding the surface treatment agent. Heating or cooling may also be performed as needed, as long as it does not adversely affect the physical properties.

[0021] 2. Cosmetics The present invention also relates to a cosmetic comprising the surface-treated spherical composite particles. The cosmetic may be in any form, such as a W / O emulsion, an O / W emulsion, a lotion, an alcohol-based preparation, a loose powder, or a pressed powder.

[0022] In the above-mentioned cosmetic, the spherical composite particles of barium sulfate and silica treated with two or more compounds selected from fatty acids and metal soaps are preferably blended in so as to account for 1 to 50% by mass, and more preferably 2 to 30% by mass, of the total cosmetic. If the amount is less than this range, the effect of adding the composite particles will be too weak, and if the amount is more than this range, the amount of other materials blended will be too small, making it difficult to impart other functions.

[0023] By incorporating the surface-treated spherical composite particles of the present invention, it is possible to obtain cosmetics that have a pleasant feel, can obscure skin imperfections such as blemishes, and have good storage stability. In addition, the incorporation of spherical composite particles with improved drop strength and suppressed sedimentation, resulting in improved dispersibility, can provide an SPF booster effect.

[0024] In addition to the above-mentioned components, the cosmetic of the present invention may contain one or more of the following components commonly used in cosmetics and quasi-drugs, such as powder components, non-polar oils, liquid oils and fats, solid oils and fats, waxes, higher fatty acids, higher alcohols, surfactants, thickeners, UV screening agents, sugars, moisturizers, drugs, etc. Examples of components that can be added are listed below.

[0025] Examples of powder components include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, lepidolite, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, tungstate metal salts, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, etc. -, metal soaps (e.g., zinc myristate, calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); inorganic white pigments (e.g., titanium oxide, zinc oxide, etc.); inorganic red pigments (e.g., iron titanate, etc.); inorganic purple pigments (e.g., mango violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); pearl pigments (e.g., titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium or aluminum lake ( For example, organic pigments such as Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404; Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1; natural pigments (e.g., chlorophyll, β-carotene, etc.), and the like.

[0026] Examples of non-polar oils include hydrocarbon oils such as silicone oil, liquid paraffin, squalane, squalene, paraffin, isohexadecane, isododecane, α-olefin oligomer, polybutene, and polyisobutylene.

[0027] Examples of silicone oils include chain silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, caprylyl methicone, diphenylsiloxyphenyl trimethicone, and methylhydrogenpolysiloxane, and cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0028] Ester oils include cetyl octanoate, ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, propylene glycol isostearate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, caprylic / capric triglyceride, isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, pentaerythrityl tetraisostearate, and diisostearate malate. Examples of suitable alkyl acrylates include tearyl, erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, dipentaerythrityl hexa(hydroxystearate / stearic acid / rosinate), dipentaerythrityl tetra(hydroxystearate / isostearate), dipentaerythrityl hexahydroxystearate, glyceryl (ethylhexanoate / stearic acid / adipic acid), glyceryl tri(caprylate / capric acid / myristic acid / stearic acid), dipentaerythrityl hexa(behenate / benzoate / ethylhexanoate), and C12-15 alkyl benzoate.

[0029] 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, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0030] 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 trotter fat, Japan wax, and hardened castor oil.

[0031] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, Ibota wax, whale wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, 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.

[0032] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0033] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.); branched-chain alcohols (e.g., monostearyl glycerin ether (batyl alcohol), 2-decyltetradecynol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and the like.

[0034] Examples of surfactants include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. Examples of nonionic surfactants include glycerin fatty acid esters and alkylene glycol adducts thereof, polyglycerin fatty acid esters and alkylene glycol adducts thereof, propylene glycol fatty acid esters and alkylene glycol adducts thereof, sorbitan fatty acid esters and alkylene glycol adducts thereof, sorbitol fatty acid esters and alkylene glycol adducts thereof, polyalkylene glycol fatty acid esters, sucrose fatty acid esters, polyoxyalkylene alkyl ethers, glycerin alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene hydrogenated castor oil, alkylene glycol adducts of lanolin, polyoxyalkylene alkyl co-modified silicones, polyether-modified silicones, polyglycerin-modified silicones, and glyceryl-modified silicones.

[0035] Examples of anionic surfactants include inorganic and organic salts of fatty acids such as stearic acid and lauric acid, alkylbenzene sulfates, alkyl sulfonates, α-olefin sulfonates, dialkyl sulfosuccinates, α-sulfonated fatty acid salts, acylmethyl taurines, N-methyl-N-alkyl taurines, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl phenyl ether sulfates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkyl phenyl ether phosphates, N-acyl amino acid salts, N-acyl-N-alkyl amino acid salts, o-alkyl-substituted malates, alkyl sulfosuccinates, and polyhydroxystearic acid.

[0036] Examples of cationic surfactants include alkylamine salts, polyamine and alkanolamine fatty acid derivatives, alkyl quaternary ammonium salts, and cyclic quaternary ammonium salts.

[0037] Amphoteric surfactants include amino acid and betaine types of carboxylic acid, sulfate, sulfonic acid, and phosphate esters, and those that are considered safe for the human body can be used. Examples include N,N-dimethyl-N-alkyl-N-carboxylmethylammonium betaine, N,N-dialkylaminoalkylenecarboxylic acid, N,N,N-trialkyl-N-sulfoalkyleneammonium betaine, N,N-dialkyl-N,N-bis(polyoxyethylene sulfate)ammonium betaine, 2-alkyl-1-hydroxyethyl-1-carboxymethylimidazolinium betaine, and lecithin.

[0038] Examples of thickeners include, for example, aqueous gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed, casein, gelatin, sodium pectinate, sodium alginate, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, sodium polyacrylate, sodium acrylate grafted starch, carboxyvinyl polymer, acrylic acid / (meth)acrylic acid alkyl copolymer or crosspolymer, polyacrylamide, acrylic acid alkyl or acrylamide / acryloyldimethyltaurate copolymer and other acrylic polymers, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium sulfide, Examples of thickeners include acid cellulose, xanthan gum, magnesium aluminum silicate, and oil-based montmorillonite clay minerals such as bentonite, hectorite-montmorillonite, beidellite, nontronite, saponite, and hectorite; organically modified clay minerals obtained by modifying clay minerals such as vermiculite and bentonite with quaternary ammonium compounds such as alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, and benzalkonium chloride; fumed silica; hydrophobic fumed silica; polysaccharide fatty acid esters such as dextrin fatty acid esters, sucrose fatty acid esters, and starch fatty acid esters; 12-hydroxystearic acid; highly polymerized methylpolysiloxanes; and crosslinked methylpolysiloxanes. These thickeners can be used singly or in combination.

[0039] Examples of UV screening agents are not particularly limited as long as they are compounds that are normally blended as thickeners in cosmetics, but specific examples of inorganic UV scattering agents include fine particle titanium oxide, fine particle zinc oxide, fine particle cerium oxide, fine particle iron oxide, as well as those supported on extender pigment powder such as mica or talc, those supported on the surface of spherical organic powder such as polymethyl methacrylate or spherical inorganic powder such as silica, and those in which other metals such as iron have been introduced into the lattice defects of fine particle metal oxides. Furthermore, commonly known surface treatment agents such as fluorine compounds, silicone compounds, metal soaps, coupling agents, waxes, surfactants, oils and fats, hydrocarbons, etc. may be surface treated by commonly known methods and then blended. As the organic UV absorber, any of those usually used in cosmetics can be blended, and specific examples thereof include 2-hydroxy-4-methoxybenzophenone, 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, 2-ethylhexyl salicylate, ethyl para-dihydroxypropylbenzoate, 2-ethylhexyl para-methoxycinnamate, 4-tert-4'-methoxydibenzoylmethane, 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoic acid hexyl ester, dimethoxybenzylidene dioxane, ...-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4- Examples include 2-ethylhexyl soimidazolidinepropionate, 2,2'-methylenebis[6-(2H-benzotriazol-2yl)-4-(1,1,3,3-tetramethylbutyl)phenol], bisethylhexyloxyphenol methoxyphenyl triazine, methylenebisbenzotriazolyltetramethylbutylphenol, 2-cyano-3,3-diphenylprop-2-enoic acid 2-ethylhexyl ester, dimethicodiethyl benzalmalonate, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and its sodium salt, and these can be used alone or in combination.

[0040] Examples of monosaccharides include trioses (e.g., D-glyceraldehyde, dihydroxyacetone, etc.); tetraoses (e.g., D-erythrose, D-erythrulose, D-threose, etc.); pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.); hexoses (e.g., D-glucose, D-talose, D-busicose, D-galactose, D-fructose, L-galactose, L-mannoside, etc.); heptose, D-tagatose, etc.); heptoses (e.g., aldoheptose, heptose, etc.); octooses (e.g., octulose, etc.); deoxysugars (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.); aminosugars (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, muramic acid, etc.); uronic acids (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.), etc.

[0041] Examples of oligosaccharides include sucrose, gunthianose, umbelliferose, lactose, planteose, isolichinoses, α,α-trehalose, raffinose, lychinoses, umbilicin, stachyose, verbascoses, and the like.

[0042] Examples of moisturizing agents include polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, melilot extract, and the like.

[0043] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.), basic amino acids (e.g., hydroxylysine, etc.), etc. Examples of amino acid derivatives include sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, etc.

[0044] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0045] Examples of alkylene oxide derivatives include POE (9) POP (2) dimethyl ether, POE (14) POP (7) dimethyl ether, POE (10) POP (10) dimethyl ether, POE (6) POP (14) dimethyl ether, POE (15) POP (5) dimethyl ether, POE (25) POP (25) dimethyl ether, POE (7) POP (12) dimethyl ether, POE (22) POP (40) dimethyl ether, and POE (35) POP (40) dimethyl. ether, POE(50)POP(40) dimethyl ether, POE(55)POP(30) dimethyl ether, POE(30)POP(34) dimethyl ether, POE(25)POP(30) dimethyl ether, POE(27)POP(14) dimethyl ether, POE(55)POP(28) dimethyl ether, POE(36)POP(41) dimethyl ether, POE(7)POP(12) dimethyl ether, POE(17)POP(4) dimethyl ether, etc.

[0046] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, edetate disodium, edetate trisodium, edetate tetrasodium, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, and ethylenediaminehydroxyethyltriacetate trisodium salt.

[0047] Examples of antioxidant aids include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, and ethylenediaminetetraacetic acid.

[0048] Other ingredients that can be added include, for example, preservatives (ethylparaben, butylparaben, etc.); whitening agents (for example, placenta extract, saxifrage extract, ascorbic acid or its derivatives, tranexamic acid, arbutin, etc.); blood circulation promoters (nicotinic acid, benzyl nicotinate, tocopherol nicotinate, β-butoxy nicotinic acid ester, minoxidil or its analogs, γ-oryzanol, alkoxycarbonylpyridine N-oxide, carpronium chloride, and acetylcholine or its derivatives, etc.). Various extracts (e.g., ginger, Uba, Coptis Rhizome, Lithospermum Root, Birch, Loquat, Carrot, Aloe, Mallow, Iris, Grape, Luffa, Lily, Saffron, Cnidium Rhizome, Angelica Root, St. John's Wort, Ononis, Garlic, Chili Pepper, Tangerine Peel, Angelica Root, Peony, Seaweed, etc.); Enhancing agents (e.g., panthenyl ethyl ether, nicotinamide, biotin, pantothenic acid, royal jelly, cholesterol derivatives, etc.); Antiseborrheic agents (e.g., pyridoxines, thianthol, etc.), etc. [Example]

[0049] Specific examples are given below to explain the present invention in detail, but the present invention is not limited to these examples. Unless otherwise specified, "%" and "wt%" mean "% by weight (% by mass)."

[0050] 1. Preparation of spherical composite particles Spherical composite particles of barium sulfate and silica were prepared by the method of Test Example 2 described in JP 2018-140921 A. The weight ratio of barium sulfate to silica was 83:17, the average particle diameter was 2.7 μm, and the sphericity was 1.05.

[0051] Example 1 10 kg of spherical composite particles of barium sulfate and silica were placed in a 20 L high-speed mixer, and then 400 g of stearic acid and 350 g of isostearic acid were added as surface treatment agents, followed by stirring and mixing at 1000 rpm. 10 minutes after the temperature of the mixing tank reached 120°C, rotation was stopped to obtain Powder 1, which was fatty acid-treated spherical composite particles.

[0052] Comparative Example 1 Surface treatment was carried out in the same manner as in Example 1, except that the surface treatment agents added, 400 g of stearic acid and 350 g of isostearic acid, were changed to 750 g of stearic acid, to obtain Powder 2, which is fatty acid-treated spherical composite particles.

[0053] Comparative Example 2 Surface treatment was carried out in the same manner as in Example 1, except that the surface treatment agents added, 400 g of stearic acid and 350 g of isostearic acid, were changed to 750 g of isostearic acid, to obtain Powder 3, which is fatty acid-treated spherical composite particles.

[0054] Comparative Example 3 Surface treatment was carried out in the same manner as in Example 1, except that the 400 g of stearic acid and 350 g of isostearic acid added as surface treatment agents were changed to 750 g of triethoxyoctylsilane. After removing the mixture from the mixer, the mixture was heat-treated at 120°C for 24 hours to obtain Powder 4, which is alkylsilane-treated spherical composite particles.

[0055] Comparative Example 4 Surface treatment was carried out in the same manner as in Example 1, except that 400 g of stearic acid and 350 g of isostearic acid added as surface treatment agents were changed to 750 g of hydrogen dimethicone. Further, after taking out from the mixer, heat treatment was performed at 120 ° C for 24 hours to obtain Powder 5 which is silicone-treated spherical composite particles.

[0056] Comparative Example 5 The operation was carried out in the same manner as in Example 1 except that no surface treatment agent was added, and Powder 6 which is untreated spherical composite particles was obtained.

[0057] 2. Evaluation Using Powders 1 to 6 of the spherical composite particles obtained in Example 1 and Comparative Examples 1 to 5, cosmetics of Formulation Examples 1 to 5 shown below were prepared, and various evaluations shown below were performed. The results are shown in Tables 1 to 5. <Touch feeling> After each sample was applied to the skin by a panel (10 persons), evaluation was carried out on a 5 - point scale from 5: good to 1: bad from the viewpoint of the feeling of use (moist, no sticky feeling, uniform and no unevenness), and evaluated by the average score.

[0058] <Sedimentation resistance> 100 ml of the sample was put into a 110 ml screw tube bottle, and after standing at 25 ° C for 1 week, the amount of sediment was visually confirmed and evaluated based on the following evaluation criteria. [Evaluation criteria] ◎: No sedimentation is confirmed 〇: Sedimentation is confirmed thinly at the bottom of the bottle, but there is no thickness △: There is sedimentation, and the thickness is less than 2 mm ×: There is sedimentation, and the thickness is 2 mm or more

[0059] <SPF value> The sample was applied to a slide glass with a bar coater #6, dried at 50 ° C for 3 hours, and the transmittance at a light wavelength of 290 - 500 nm was measured with an ultraviolet - visible near - infrared spectrophotometer (manufactured by JASCO Corporation, V - 770). From the obtained transmittance, the SPF value (A) was calculated by SPF calculation software.

[0060] [[ID=4f1]] <Drop strength> The molded product was dropped from a height of 50 cm, the number of times it took to break was counted, and the average values ​​(n=5) were compared.

[0061] Prescription example 1 Six types of O / W emulsion foundations were prepared with different powder compositions as shown below. (component) (wt%) 1. Stearic acid 0.7 2. Behenyl alcohol 0.5 3. Glyceryl stearate 0.5 4. Squalane 8.0 5. Caprylic / Capric Triglyceride 4.0 6. Isotridecyl isononanoate 2.0 7. Sorbitan sesquioleate 0.5 8. (Acrylates / C10-30 alkyl acrylate) crosspolymer (2% gel) 5.0 9. Polysorbate 80 1.2 10. Carbomer (2% gel) 15.0 11. Xanthan gum (2% gel) 2.0 12. 1,3-butylene glycol 7.0 13. Triethanolamine 0.75 14.Wednesday 20.65 15. Powder 1~6 5.0 16. Titanium oxide dispersion (Note 1) 11.2 17. Iron oxide (yellow) dispersion (Note 2) 2.2 18. Iron oxide (red) dispersion (Note 3) 0.6 19. Iron oxide (black) dispersion (Note 4) 0.2 20.Wednesday 13.0 (Note 1) DIP-T1(N) (Sakai Chemical Industry Co., Ltd.): Titanium dioxide 75 wt%, hydrogen dimethicone 1 wt%, 1,3-butylene glycol 22 wt%, PEG-9 dimethicone 3 wt% (Note 2) DIP-Y1(N) (Sakai Chemical Industry Co., Ltd.): Yellow iron oxide 59 wt%, hydrogen dimethicone 1 wt%, 1,3-butylene glycol 37.5 wt%, PEG-9 dimethicone 2.5 wt% (Note 3) DIP-R1(N) (Sakai Chemical Industry Co., Ltd.): Bengala 49 wt%, Hydrogen Dimethicone 1 wt%, 1,3-Butylene Glycol 48.5 wt%, PEG-9 Dimethicone 1.5 wt% (Note 4) DIP-K1(N) (Sakai Chemical Industry Co., Ltd.): Black iron oxide 59 wt%, hydrogen dimethicone 1 wt%, 1,3-butylene glycol 37.5 wt%, PEG-9 dimethicone 2.5 wt%

[0062] (Manufacturing method) A: 1 to 7 were mixed uniformly and heated to 80°C. B: 8 to 14 were mixed uniformly and heated to 80°C. C: A was added to B and emulsified. D: 16 to 20 were mixed uniformly. E: 15 and D were added to C at 60°C or less and mixed uniformly.

[0063] [Table 1]

[0064] It was found that the O / W emulsion containing Powder 1 had excellent resistance to settling and texture.

[0065] Prescription example 2 Six types of W / O creams with different powder compositions were prepared as follows. (component) (wt%) 1. Dimethylpolysiloxane 5.0 2. Methylphenylpolysiloxane 5.0 3. Squalane 8.0 4. Neopentyl glycol dioctanoate 3.0 5. PEG-10 Dimethicone 3.0 6. Powder 1~6 5.0 7. Glycerin 10.0 8.Wednesday 61.0

[0066] (Manufacturing method) A: 1 to 5 were mixed and homogenized, and then 6 was added and mixed homogenously. B: 7 and 8 were mixed and stirred. C: B was gradually added to A while stirring.

[0067] [Table 2]

[0068] It was found that the W / O cream containing powder 1 had excellent settling resistance and texture.

[0069] Prescription example 3 Six types of W / O sunscreen emulsions with different powder compositions were prepared as follows. (component) (wt%) 1. Cyclopentasiloxane 15.0 2. Olefin Oligomer 10.0 3. Dimethylpolysiloxane 2.0 4. PEG-9 Dimethicone 1.0 5. Neopentyl glycol dioctanoate 5.0 6. Diisopropyl sebacate 5.0 7. 4-tert-butyl-4'-methoxydibenzoylmethane 2.5 8. Trimethylstearylammonium Bentonite 0.2 9. Powder 1~6 5.0 10. Silicone-treated zinc oxide (Note 5) 15.0 11.Wednesday 35.3 12. Glycerin 3.0 13. Hydroxyethylcellulose 0.5 14. Phenoxyethanol 0.5 (Note 5) FINEX-52W-LP2 (Sakai Chemical Industry Co., Ltd.): Zinc oxide 86 wt%, silica 10 wt%, hydrogen dimethicone 4 wt%

[0070] (Manufacturing method) A: 1 to 5 were mixed uniformly. B: 6 and 7 were heated to 80°C, mixed and dissolved, and added to A. C: Add 8 to 10 to B and mix vigorously to disperse thoroughly. D: 11 to 14 were heated to 95°C, mixed and dissolved, and gradually mixed into C while stirring. E: After thoroughly mixing uniformly, the mixture was cooled to 25°C to obtain a sunscreen emulsion.

[0071] [Table 3]

[0072] It was found that the W / O sunscreen emulsion using Powder 1 exhibited an SPF booster effect and was excellent in both settling resistance and feel.

[0073] Prescription example 4 Six types of powder foundations were prepared with different powder compositions as shown below. (component) (wt%) 1. Powder 1~6 10.5 2. Metal soap-treated barium sulfate plate (Note 6) 30.0 3. Silicone-treated zinc oxide (Note 7) 2.5 4. Silicone-treated titanium dioxide (Note 8) 5.5 5. Silicone-treated mica (Note 9) 13.0 6. Silicone-treated synthetic phlogopite (Note 10) 12.5 7. Silicone-treated talc (Note 11) 8.1 8. Lauroyl Lysine 5.0 9. Silicone-treated oxidized iron oxide (Note 12) 0.4 10. Silicone-treated yellow iron oxide (Note 13) 1.8 11. Silicone-treated black iron oxide (Note 14) 0.2 12. Squalane 2.5 13. (Dimethicone / Phenylvinyldimethicone) Crosspolymer, Diphenylsiloxyphenyl Trimethicone 6.0 14. (Acrylates / Stearyl Acrylate / Dimethicone Methacrylate) Copolymer 2.0 (Note 6) HG-LFP (Sakai Chemical Industry Co., Ltd.): Barium sulfate 98.9 wt%, palmitic acid 1.0 wt%, magnesium hydroxide 0.1 wt% (Note 7) FINEX-50S-LP2 (Sakai Chemical Industry Co., Ltd.): Zinc oxide 96 wt%, Hydrogen dimethicone 4 wt% (Note 8) MKR-1S (Sakai Chemical Industry Co., Ltd.): Titanium dioxide 98.5 wt%, hydrogen dimethicone 1.5 wt% (Note 9) Y-2300X (Yamaguchi Mica Co., Ltd.): 98% mica by weight, 2% hydrogen dimethicone by weight (Note 10) PDM-5L(S) (Topy Industries): Phlogopite 98wt%, Hydrogen Dimethicone 2wt% (Note 11) SA-Talc JA-46R (Miyoshi Chemicals): 98% talc, 2% hydrogen dimethicone by weight (Note 12) SI-Red R-516PS LHC (Miyoshi Chemicals): Bengala 98% by weight, Cialis dimethicone 2% by weight (Note 13) SI-Yellow LL-100P LHC (Miyoshi Chemicals): Yellow iron oxide 98 wt%, Cialis dimethicone 2 wt% (Note 14) SI-Black BL-100P LHC (Miyoshi Chemicals): Black iron oxide 98 wt%, Cialis dimethicone 2 wt%

[0074] (Manufacturing method) A: 1 to 14 were mixed in a mixer. B: Pressed using a press.

[0075] [Table 4]

[0076] The powder foundation made with Powder 1 had a pleasant feel and was also found to have strong drop strength.

[0077] Prescription Example 5 Six types of powder foundations were prepared with different powder compositions as shown below. (component) (wt%) 1. Powder 1~6 10.0 2. Silicone-treated mica (see note 9 above) 30.8 3. Silicone-treated talc (see note 11 above) 15.0 4. Silicone-treated titanium dioxide (see note 8 above) 10.0 5. Silicone-treated synthetic phlogopite (see note 10) 10.0 6. Silicone-treated red iron oxide (see note 12) 0.5 7. Silicone-treated yellow iron oxide (see note 13) 2.0 8. Silicone-treated black iron oxide (see note 14) 0.2 9. Polymethyl methacrylate 10.0 10. Dimethicone (500cst) 5.0 11. Isononyl isononanoate 3.0 12. Squalane 2.0 13. Vaseline 1.0 14. Phenoxyethanol 0.5

[0078] (Manufacturing method) A: 1 to 14 were mixed in a mixer. B: 50 parts of light liquid isoparaffin was added to 100 parts by weight of A, and mixed uniformly in a mixer. C: The slurry of B was filled into a dish and compression molded while suctioning with vacuum. D: The molded product of C was dried at 70°C for 10 hours to obtain a powder foundation.

[0079] [Table 5]

[0080] The powder foundation made with Powder 1 had a pleasant feel and was also found to have strong drop strength.

Claims

1. Spherical composite particles of barium sulfate and silica, the spherical composite particles are surface-treated with two or more compounds selected from fatty acids and metal soaps, The spherical composite particles of barium sulfate and silica are characterized in that at least one of the compounds used for the surface treatment is a solid compound at 20°C and at least one is a liquid compound at 20°C.

2. The spherical composite particles of barium sulfate and silica according to claim 1, characterized in that the mass ratio of the compound that is solid at 20 ° C. to the compound that is liquid at 20 ° C. used for the surface treatment is 9:1 to 1:

9.

3. A cosmetic comprising the spherical composite particles of barium sulfate and silica according to claim 1 or 2.

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