JP6012983B2 - Coated powder and method for producing the same - Google Patents

Description

  The present invention relates to a coated powder and a method for producing the same. Moreover, this invention relates to the dispersion and cosmetics containing the said coating powder.

  When the surface of the powder is coated with an organic compound, the dispersibility, storage stability and suitability for use of the powder are improved, and the function of the powder, for example, adhesion to the skin (adhesion), feel (use feeling), Gloss, hiding power, coloring power, transparency, shielding ability of ultraviolet rays and infrared rays, conductivity, fluorescence, luminescence, catalytic activity, etc. can be greatly improved. For this reason, powders coated with organic compounds are widely used in various fields such as cosmetics, plastic additives, inks, paints, toners (magnetic powders, external additives), chemical fibers, packaging materials, and electronic materials. ing.

  For example, Patent Document 1 discloses such an organic compound-coated powder in which a mixture of dimethicone (dimethylpolysiloxane) and dimethicone / methicone copolymer (methylhydrogensiloxane-dimethylsiloxane copolymer) is mixed with a powder using a mixer. Then, it is described that the mixture is coated on the surface of the powder.

  Patent Document 2 discloses a normal surface treatment agent coating layer (A layer) such as a reactive organopolysiloxane formed on the particle surface of a powder at room temperature and a normal temperature such as one-end functional group-modified organopolysiloxane. In the surface treatment powder containing the liquid surface treatment agent coating layer (B layer), after mixing the powder to be treated with a Hensyl mixer or a super mixer and the solid surface treatment agent, A dry method in which a liquid surface treatment agent is mixed and dried, and after the powder to be treated and a solid surface treatment agent are contacted and coated in a high-speed air current such as a JET mill, a liquid surface treatment agent is further added. It describes the method of coating by contact.

JP 2007-56082 A JP 2001-72527 A

In the organic compound-coated powder produced by the methods of Patent Documents 1 and 2, oil-based dispersibility (hydrophobicity) is obtained by coating the organic compound, but the oil-based dispersibility gradually decreases during use. There is a need for coated powders that are excellent in dispersion stability over time.

  Accordingly, the present inventors have conducted various studies on the assumption that if a strong coating is performed with individual particles, the coating of the organic compound is difficult to peel off during use and the dispersion stability can be improved. Forming a first heat-fixed coating of the organic compound formed on the part and a second heat-fixed coating of the organic compound on at least a part of the coating, thereby obtaining a desired coating powder, such as The coated powder includes a step in which the powder and the first coated organic compound are pulverized in an airflow pulverizer, followed by heat treatment to form a first heat fixed coating, and the powder obtained in the above step and the first The present invention was completed by finding that it can be produced by carrying out a step of forming a second heat-fixed coating by heat treatment and pulverizing the two-coated organic compound in an airflow pulverizer.

That is, the present invention provides: (1) a first heat-fixed coating of an organic compound formed on at least a part of the powder surface and a second organic compound formed on at least a part of the first heat-fixed coating. Coated powder having a heat-fixed coating,
(2) The powder and the first coating organic compound are pulverized in an airflow pulverizer and then heat-treated to form a first heat-fixed coating on at least a part of the powder surface; A step of forming the second heat-fixed coating on at least a part of the first heat-fixed coating after the obtained powder and the second coating organic compound are pulverized in an airflow pulverizer and then heat-treated; A method for producing a coated powder,
(3) A dispersion containing the coated powder according to (1),
(4) Cosmetics containing the coated powder according to (1).

The present invention is a powder having a first heat-fixed coating and a second heat-fixed coating of an organic compound, and is excellent in long-term oil dispersion stability, hydrophobic stability, etc. be able to. For example, when the coated powder of the present invention is blended with a dispersion in which a solvent is dispersed or a cosmetic, it can be used stably for a long period of time, and the concentration of the powder can be increased.
Further, the present invention is a method for producing a coated powder, wherein the powder and the organic compound are pulverized in an airflow pulverizer and then heat-treated twice to perform the first heat-fixed coating and the second heat-fixed. By applying the coating, a stronger coating can be obtained.

  The present invention has a first heat-fixed coating of an organic compound formed on at least a part of the powder surface and a second heat-fixed coating of an organic compound formed on at least a part of the first heat-fixed coating. It is a coated powder.

As the powder, various substances can be used. For example, as an extender pigment, mica, sericite, talc, clay, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, magnesium silicate, aluminum silicate, calcium phosphate, Examples thereof include anhydrous silicic acid, alumina, magnesium oxide, zirconium oxide, aluminum hydroxide, barium sulfate, magnesium aluminate silicate, magnesium aluminate metasilicate, boron nitride, zeolite, hydroxyapatite, and ceramic powder. White pigments include basic lead carbonate, basic lead sulfate, titanium oxide, zinc oxide, cerium oxide, zinc phosphate, and aluminum phosphate, and color pigments include bengara, yellow iron oxide, and black iron oxide. , Cobalt oxide, chromium oxide, chromium hydroxide, bitumen, ultramarine, carbon black, low order titanium oxide, mango violet, cuprous oxide, graphite, chrome lead, cadmium yellow, cadmium red, cobalt blue, molybdate orange, etc. As fluorescent pigments, zinc sulfide, zinc silicate, cadmium zinc sulfate, calcium sulfide, strontium sulfide, calcium tungstate, etc., as pearl pigments, bismuth oxychloride, titanium mica, fish scale foil, etc. Fine metallic titanium oxide, fine zinc oxide, fine iron oxide, fine cerium oxide, etc. Aluminum powder, zinc powder, gold powder, silver powder, tin powder, stainless steel powder, diamond powder, copper powder, nickel powder, bronze powder, etc. as the material, zinc sulfide, calcium tungstate, etc. as the fluorescent pigment, and other powders Examples of the body include tin oxide, ATO (antimony-doped tin oxide), ITO (tin-doped indium oxide), and Al-doped zinc oxide. In addition, a composite of these powders or a coating with an inorganic compound can be used as necessary. For example, fine particle powders such as fine particle titanium oxide, fine particle zinc oxide, fine particle iron oxide, fine particle cerium oxide are made of at least aluminum, calcium, magnesium, cerium, silicon, zirconium, titanium, zinc, iron, cobalt, manganese, nickel and tin. Examples thereof include powders coated with one kind of oxide or hydrous oxide, powders coated with inorganic colored pigments such as Bengala with silicic anhydride, and powders coated with extender pigments with fine white pigments.

  The coated powder of the present invention is a coating (hereinafter referred to as heat-fixed coating) in which a specific organic compound is coated on at least a part of the powder surface, and the organic compound is fixed to the powder surface by heating. A first heat-fixed coating and two layers of a second heat-fixed coating formed on at least a part of the first heat-fixed coating are provided. The first heat-fixed coating amount and the second heat-fixed coating amount can be appropriately set, and the total amount is preferably about 5 to 30% by weight, more preferably 10 to 25% by weight based on the weight of the powder, 15 More preferred is ˜25% by weight. Further, the coating ratio of the first heat-fixed coating and the second heat-fixed coating is preferably 5/10 to 10/10, more preferably 5/10 to 8/10, and 5/10 to 7 / in weight ratio. 10 is more preferable.

  The first coating organic compound forming the first heat-fixed coating is polysiloxane, alkoxysilane, alkylsilane, fatty acid or salt thereof, polyolefin, hydrogenated lecithin or salt thereof, N-acyl amino acid or salt thereof, dextrin fatty acid At least one selected from esters is preferred. The first coating organic compound forming the second heat-fixed coating is polysiloxane, alkoxysilane, alkylsilane, fatty acid or salt thereof, polyolefin, hydrogenated lecithin or salt thereof, N-acylamino acid or salt thereof, At least one selected from dextrin fatty acid esters is preferred.

  Polysiloxane is an oligomer or polymer obtained by hydrolyzing silanes such as dichlorodimethylsilane and dehydrating condensation of the generated silanol. Examples of the polysiloxane include organopolysiloxanes such as dimethylpolysiloxane, dimethoxypolysiloxane, modified organopolysiloxane, organohydrogenpolysiloxanes such as methylhydrogenpolysiloxane, and siloxanes such as methylhydrogensiloxane-dimethylsiloxane copolymer. It is a compound containing an oligomer or polymer obtained by dehydration condensation of a silanol such as a copolymer, a silicone polymer, or triorganosiloxysilicic acid.

  Specifically, examples of the organopolysiloxane include dimethylpolysiloxane, which is also called dimethicone, and its basic chemical structure is represented by the following general formula (I). In general formula (I), n is preferably n = 1 to 400, and the viscosity is preferably about 1 to 1000 centistokes.

  Examples of the organohydrogenpolysiloxane include methylhydrogenpolysiloxane, and the polymerization degree n is more preferably an integer of 3 to 7. Examples of the siloxane copolymer include a methylhydrogensiloxane-dimethylsiloxane copolymer, which is also called a dimethicone / methicone copolymer, and its basic chemical structure is represented by the following general formula (II). In the present invention, In the general formula (II), m and n are preferably m = 7 to 14, n = 3 to 8, and m + n is preferably m + n = 10 to 22.

  Examples of the alkoxysilane include methyltrimethoxysilane, ethyltriethoxysilane, octyltriethoxysilane, and the like. Examples of the alkyl silane include methyl silane, ethyl silane, octyl silane and the like. Examples of fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, isomyristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, arachidic acid, undecylenic acid, oleic acid, myristoleic acid, elaidic acid, Examples thereof include linoleic acid, linolenic acid, arachidonic acid, coconut oil fatty acid, beef tallow fatty acid, resin acid (abietic acid), salts thereof, and metal salts thereof. Further, trimethylsiloxysilicic acid is obtained by dissolving water glass sodium obtained by substituting sodium with a trimethylsilyl group in a solvent.

  In addition, polyethylene, polypropylene, and the like can be used as the polyolefin. For example, low molecular polyethylene having a molecular weight of 500 to 20000 and a melting point of 40 ° C. or more, polyethylene oxide obtained by oxidizing polypropylene, maleated polyethylene, polypropylene oxide, and the like. Commercial products can be used.

  Hydrogenated lecithin is a hydrogenated natural lecithin or synthetic lecithin extracted from egg yolk, soybean, corn, rapeseed, etc., and has an iodine value of preferably 30 or less, more preferably 15 or less. And a glyceride having a phosphate group. As the salt form, a water-insoluble hydrogenated lecithin metal salt such as Al, Mg, Ca, Zn, Zr and Ti is preferable.

  N-acylamino acids are those in which the amino group and / or imino group of the amino acid is acylated. Examples of amino acid types include glycine, alanine, β-alanine, valine, leucine, isoleucine, phenylalanine, proline, threonine, serine, arginine, histidine, lysine, aspartic acid, glutamic acid, tyrosine, methionine, cystine, cysteine, etc. Can do.

  The fatty acid constituting the N-acyl is preferably a long-chain fatty acid. Examples thereof include acid, oleic acid, myristoleic acid, elaidic acid, linoleic acid, linolenic acid, arachidonic acid, coconut oil fatty acid, beef tallow fatty acid, and resin acid (abietic acid). As salt forms, metal salts such as Na, K, Ba, Zn, Ca, Mg, Fe, Zr, Co, Al, Zr, Ti, ammonium salts, monoethanolamine, diethanolamine, triethanolamine, 2-amino Examples thereof include various alkanolamine salts such as 2-methyl-propanol, 2-amino-2-methyl-1,3-propanediol, and triisopropanolamine.

  Moreover, as dextrin fatty acid ester, it can select from the ester comprised with dextrin and a fatty acid, or its derivative (s). Preferably, for one dextrin molecule, an ester having at least a partial structure in which one molecule of a fatty acid having 8 to 24 carbon atoms is esterified to one of its hydroxyl groups, or a derivative thereof, such as 8 to 8 carbon atoms for one molecule of dextrin Examples include ester bodies having a structure in which one or a plurality of 24 fatty acids and one or more of the hydroxyl groups are ester-bonded, and derivatives in which the hydroxyl groups are further esterified with another fatty acid. .

  In the present invention, it is more preferable that the first heat-fixed coating is a coating containing at least a methylhydrogensiloxane-dimethylsiloxane copolymer, and the second heat-fixed coating is a coating containing at least dimethylpolysiloxane. Since the methylhydrodienesiloxane-dimethylsiloxane copolymer has hydrogen groups as shown in the general formula (II), the powder surface is coated with hydrogen bonds, and the remaining hydrogen groups and dimethylpolysiloxane are further coated. The bond forms a two-layer strong coating.

  Next, the present invention includes a step of forming the first heat-fixed coating on at least a part of the powder surface by pulverizing the powder and the first coating organic compound in an airflow pulverizer, The powder obtained in the above step and the second coating organic compound are pulverized in an airflow pulverizer and then heat-treated, and the second heat-fixed coating is applied to at least a part of the first heat-fixed coating. Forming a coated powder including a forming step.

  First, the powder and the first coating organic compound are put in an airflow pulverizer and pulverized. An airflow pulverizer is a machine that jets argon gas, nitrogen gas, or the like from a nozzle at high speed, and accelerates powder particles by this gas flow and collides with each other to pulverize them, using a jet mill, a cross jet mill, a selenium mirror, etc. be able to.

  Next, the process which heats a ground material is performed. The temperature and time of the first heat treatment can be appropriately set, and the heating temperature is preferably 50 to 300 ° C, more preferably 100 to 200 ° C, and still more preferably 120 to 170 ° C. The heating time is preferably 0.5 to 12 hours. The heating atmosphere may be any of an oxygen gas, an oxidizing atmosphere such as air, an inert gas atmosphere such as nitrogen gas and argon gas, and a reducing gas atmosphere such as hydrogen gas, and an inert gas atmosphere is particularly preferable. By this first heat treatment, the pulverized product is dried and a first heat-fixed coating is formed.

  Next, the first heat-fixed powder is pulverized in the second coating organic compound and the airflow pulverizer and then subjected to the second heat treatment. The temperature and time of the second heat treatment can be appropriately set, and the heating temperature is preferably 50 to 300 ° C, more preferably 100 to 200 ° C, and still more preferably 120 to 170 ° C. The heating time is preferably 0.5 to 12 hours. The heating atmosphere may be any of an oxygen gas, an oxidizing atmosphere such as air, an inert gas atmosphere such as nitrogen gas and argon gas, and a reducing gas atmosphere such as hydrogen gas, and an inert gas atmosphere is particularly preferable. By this second heat treatment, the pulverized product is dried and a second heat-fixed coating is formed.

  As the first coating organic compound and the second coating organic compound, the above-mentioned organic compounds can be used, and as the first coating organic compound, at least a methylhydrogensiloxane-dimethylsiloxane copolymer is more preferable. The compound is more preferably at least dimethylpolysiloxane.

  In addition, it is preferable to mix the powder and the first coated organic compound or the second coated organic compound before entering the airflow grinder, a mixer such as a Hensyl mixer or a super mixer, a mill such as a ball mill or a sand grinder. Are preferably mixed together. The mixing conditions can be appropriately set. For example, the mixing temperature is preferably room temperature, the mixing atmosphere is an oxygen gas, an oxidizing atmosphere such as air, an inert gas atmosphere such as nitrogen gas or argon gas, and a reducing property such as hydrogen gas. Any gas atmosphere may be used, and an inert gas atmosphere is particularly preferable.

  Next, the present invention is a dispersion containing the above-mentioned coated powder, in which the coated powder is dispersed in a dispersion medium.

  The concentration of the coating powder can be adjusted as appropriate, but a higher concentration is preferable. Specifically, 10 to 75% by weight is preferable, 10 to 65% by weight is more preferable, and 30 to 60% by weight is still more preferable.

  The dispersion medium is not particularly limited, and various types can be used as appropriate, and a lipophilic dispersion medium can be suitably used. Specifically, monohydric alcohol solvents such as ethanol, propyl alcohol, isopropyl alcohol, butanol, amyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol, capryl alcohol, nonyl alcohol, decyl alcohol, phenol and benzyl alcohol, normal Petroleum hydrocarbons such as pentane, normal hexane, normal heptane, normal octane, isohexane, isooctane, gasoline, mineral spirits, aromatic hydrocarbon solvents such as benzene, toluene, xylene, cyclohexane, ethylbenzene, amylbenzene, dipentene , Plant hydrocarbon solvents such as turpentine oil, nitro hydrocarbon solvents such as nitroparaffin and nitrobenzene, acetone, methyl ethyl ketone, Ketone solvents such as til isobutyl ketone, ethyl butyl ketone, diisobutyl ketone, halogenated hydrocarbon solvents such as methylene chloride, chloroform, carbon tetrachloride, perchlorethylene, monochlorobenzene, ethyl ether, isopropyl ether, butyl ether, Ether solvents such as hexyl ether, propylene oxide, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, methyl formate, ethyl formate, butyl formate, methyl acetate, ethyl acetate, butyl acetate, acetic acid Ester solvents such as amyl, ethyl propionate, butyl propionate, isobutyl propionate, ethyl butyrate, butyl butyrate, methyl lactate, ethyl lactate, butyl lactate, amyl lactate, safra -Oil, soybean oil, evening primrose oil, grape seed oil, rosehip oil, cucumber nut oil, almond oil, sesame oil, wheat germ oil, corn oil, cottonseed oil, avocado oil, olive oil, camellia oil, persic oil, castor oil, peanut oil Oils such as hazelnut oil, macadamia nut oil, medofoam oil, cocoa butter, shea butter, tree wax, coconut oil, palm oil, palm kernel oil, beef tallow, horse fat, mink oil, milk fat, egg yolk oil, turtle oil, Liquid paraffin, liquid isoparaffin, squalane, squalene, petrolatum, paraffin, ceresin, microcrystalline wax and other hydrocarbon oils, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, undecylenic acid, Fatty acids such as hydroxystearic acid and lanolin fatty acid, milli Still alcohol, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, aralkyl alcohol, behenyl alcohol, oleyl alcohol, jojoba alcohol, batyl alcohol, higher alcohols such as cholesterol, phytosterol, lanolin alcohol, isostearyl alcohol, isopropyl isostearate, ethyl oleate , Isopropyl myristate, isoisopropyl palmitate, cetyl octanoate, diisostearyl malate, glyceryl tricaprylate, isooctyl isononanoate, isononyl isononanoate, isotridecyl isononanoate, octyldodecyl neopentanoate, isotridecyl neopentanoate, myristyl neopentanoate, diisononane Propylene glycol acid, tri-2- Ester oils such as glyceryl tilhexanoate, trimethylolpropane tri-2-ethylhexanoate, beeswax, candelilla wax, whale wax, cotton wax, carnauba wax, bayberry wax, nukarou, ibotarou, orange luffy oil, montan wax, sugarcane wax, shellac wax, lanolin , Jojoba oil, waxes, methylpolysiloxane, methylphenylpolysiloxane, decamethylcyclotetrasiloxane, alkyl-modified silicone, alcohol-modified silicone, amino-modified silicone, epoxy-modified silicone, olefin-modified silicone, carboxyl-modified silicone, carbinol Modified silicone, phenol modified silicone, methacryl modified silicone, mercapto modified silicone, phosphoric acid modified silicone, fluorine modified silicone Silicones such as corn, higher fatty acid-modified silicone, polyether-modified silicone, perfluoropolyether, hydrofluoroether, perfluoromethylcyclopentane, perfluorodimethylcyclohexane, perfluorodimethylcyclobutane, methoxynonafluorobutane, ethoxynonafluorobutane Fluorine oils such as dodecafluoropentane, tetradecafluorohexane, perfluorodecane, perfluorooctane, 4-trifluoromethylperfluoromorpholine, 4-pentafluoroethylperfluoromorpholine, paraaminobenzoic acid, paraamino as UV absorber Benzoic acid monoglycerin ester, N, N-dimethylparaaminobenzoic acid ethyl ester, N, N-diethoxyparaaminobenzoic acid ethyl Benzoic acids such as ethyl ester, N, N-dipropoxyparaaminobenzoic acid ethyl ester, anthranilic acids such as homomenthyl-N-acetylanthranilate, amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, etc. Salicylic acids, octylcinnamate, ethyl-4-isopropylcinnamate, methyl-2,5-diisopropylcinnamate, ethyl-2,4-diisopropylcinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinna Mate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate, 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate Cinnamic acids such as namate, 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4 -Benzophenones such as phenylbenzophenone and 4-hydroxy-3-carboxybenzophenone, 3-benzylidene-d, l-camphor, urocanic acid, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, dibenzalazine, dianisoyl Examples thereof include methane, 4-tert-butyl-4′-methoxydibenzoylmethane, a silicone-modified ultraviolet absorber, a fluorine-modified ultraviolet absorber. Of these, one or more can be used as the lipophilic solvent in the present invention.

  In addition, pigment dispersions, oils, surfactants, ultraviolet absorbers, preservatives, antioxidants, film forming agents, humectants, thickeners, dyes, pigments, fragrances and the like are appropriately added to the dispersion of the present invention. Can be blended.

  For example, alkyl ether sulfates such as POE lauryl sulfate triethanolamine, alkylbenzene sulfonates such as sodium dodecylbenzenesulfonate, higher alkyl sulfates such as sodium lauryl sulfate and potassium lauryl sulfate, N-acyl sarcosine acid, N- Higher fatty acid amide sulfonates such as sodium myristoyl-N-methyltaurine, higher fatty acid ester sulfates such as hydrogenated coconut oil fatty acid sodium glycerol sulfate, higher fatty acid ester sulfonates, higher fatty acid alkylolamide sulfates, fatty acid soaps , Sulfosuccinate, secondary alcohol sulfate, POE alkyl ether carboxylic acid, POE alkyl allyl ether carboxylate, α-olefin sulfonate, lauroyl mono Anionic surfactants such as sodium tanolamide succinate, N-palmitoyl aspartate diethanolamine, sodium caseinate, alkyltrimethylammonium salts such as stearyltrimethylammonium chloride, alkylpyridinium salts such as distearyldimethylammonium dialkyldimethylammonium chloride, alkyl Quaternary ammonium salt, alkylamine salt, alkyldimethylbenzylammonium salt, alkylisoquinolinium salt, dialkyl morpholinium salt, POE alkylamine, polyamine fatty acid derivative, amyl alcohol fatty acid derivative, benzalkonium chloride, benzethonium chloride, etc. Cationic surfactant, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium Imidazoline-based amphoteric surfactants such as salts, betaine-based amphoteric surfactants such as alkylbetaine, amidebetaine, and lauryldimethylaminoacetic acid betaine, glycerin fatty acid esters such as glyceryl sesquioleate and glyceryl monostearate, hexaglyceryl polyricinoleate Polyglycerin fatty acid esters such as diglyceryl monostearate and decaglyceryl dekaoleate, sorbitan fatty acid esters such as sorbitan monooleate and sorbitan sesquioleate, propylene glycol fatty acid esters such as propylene glycol monostearate, POE sorbitan monooleate, etc. POE glycerin fatty acid ester such as POE sorbitan fatty acid ester, POE glycerin triisostearate, POE monooleate, POE dis POE fatty acid esters such as allate, POE alkyl ethers such as POE lauryl ether and POE stearyl ether, POE POP alkyl ethers such as POE / POP hydrogenated lanolin, hardened castor oil derivatives, glycerin alkyl ethers, alkanolamides, sucrose fatty acid esters, Dextrin fatty acid esters, starch fatty acid esters, nonionic surfactants such as hydroxystearic acid, phospholipids such as lecithin, glycolipids such as trehalose lipid, perfluoroalkyl phosphate, perfluoroalkyl sulfonate, Fluorine surfactants such as fluoroalkyl carboxylates, etc., alkyl methacrylate methacrylate copolymers, natural or synthetic clay minerals such as bentonite, smectite and kaolin, organic amine cuticles Organically-modified clay minerals such as down-modified bentonite, can be exemplified aerosol or the like.

  The method for kneading or mixing and dispersing the coated powder in the dispersion medium in the present invention is not particularly limited as long as a known method is adopted. For example, kneader mixers such as kneader kneading, hensil kneading, roll kneading, extruder kneading, etc. A dispersion can be produced using a mixing and dispersing machine.

  Next, the present invention is a cosmetic containing the above-described coated powder, and the above-mentioned coated powder may be blended to make a cosmetic, or the dispersion may be used to make a liquid cosmetic. For example, powder foundation, liquid foundation, oil foundation, stick foundation, pressed powder, face powder, lipstick, lip gloss, blusher, eye shadow, eyebrow, eyeliner, mascara, aqueous nail enamel, oily nail enamel, emulsified nail enamel, Finishing cosmetics such as enamel top coat, enamel base coat, emollient cream, cold cream, whitening cream, milky lotion, lotion, essence, carmine lotion, liquid facial cleanser, facial cleansing foam, facial cleansing cream, facial cleansing powder, makeup cleansing, body gloss Cosmetics for skin such as hair gloss, hair cream, hair shampoo, hair rinse, hair color, hair brushing agent, etc. Only stop or sunburn cream or milk, can be given soap, bath agent, perfume and the like.

  The blending amount of the coating powder can be appropriately blended according to the form of the cosmetic. For example, for a liquid cosmetic, 1 to 20% by weight is preferable, 1 to 15% by weight is more preferable, and 1 to 10%. More preferred is weight percent. For the cosmetics of the present invention, those usually blended can be used, for example, pigment dispersants, oils, surfactants, ultraviolet absorbers, preservatives, antioxidants, film forming agents, moisturizers, Adhesives, dyes, pigments, fragrances and the like can be appropriately blended.

The coated powder and dispersion of the present invention can be suitably used for applications other than cosmetics, such as plastic additives, inks, paints, toners (magnetic powders, external additives), chemical fibers, packaging materials, Widely used in various fields such as electronic materials.

  Examples of the present invention are shown below, but the present invention is not limited thereto.

Example 1
75g of methylhydrodienesiloxane-dimethylsiloxane copolymer (manufactured by Shin-Etsu Chemical Co., Ltd., KF-9901) is added to 1000g of fine particle titanium oxide (manufactured by Ishihara Sangyo Co., Ltd., TTO-S-3), and Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). Was mixed at 1800 rpm in a nitrogen atmosphere at room temperature for 20 minutes. Next, the mixture was pulverized with an airflow pulverizer (manufactured by Seishin Enterprise Co., Ltd.), then placed in an inert oven (manufactured by Yamato Kagaku Co., DN-4101), and subjected to heat treatment at 150 ° C. for 30 minutes in a nitrogen atmosphere, and first heat fixed A coated powder was obtained.

  Next, 70 g of dimethylpolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., KF-96-100cs) is added to 1000 g of the obtained powder, and the mixture is 20 at 1800 rpm in a nitrogen atmosphere at room temperature using a Henschel mixer (manufactured by Mitsui Mining). Mixed for minutes. Next, after the mixture is pulverized by the airflow pulverizer, the mixture is placed in the inert oven and heat-treated at 150 ° C. for 30 minutes in a nitrogen atmosphere to form a second heat-fixed coating. (Sample A) was obtained.

(Comparative Example 1)
In the first step of Example 1, a mixture of fine particle titanium oxide and methylhydrodienesiloxane-dimethylsiloxane copolymer was pulverized with an airflow pulverizer and then subjected to heat treatment at 150 ° C. for 30 minutes in a nitrogen atmosphere. A coated powder (Sample B) was obtained in the same manner as in Example 1 except that it was not.

(Preparation of dispersion)
100 g of each of Samples A and B prepared by the above method was put in a 225 cc mayonnaise bottle, 100 g of cyclopentasiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., KF-995) and glass beads were added, and dispersed for 30 minutes with a paint shaker. Next, the glass beads were separated by filtration to obtain a dispersion of the present invention (sample C) using sample A and a comparative dispersion (sample D) using sample B.

(Dispersion stability evaluation)
40 ml of each of Samples C and D was placed in a plastic tube, and centrifuged for 1 minute at 5000 rpm with a centrifuge (himac CR21GII manufactured by Hitachi Koki Co., Ltd.).
As a result of visual observation of the sample after centrifugal classification, it was confirmed that Sample C of the present invention was superior to Sample D in terms of long-term oil dispersion stability.

(Ultraviolet shielding evaluation results)
3 g of each of the above dispersions (samples C and D) is put into a 100 cc polypropylene cup, 18.4 g of cyclopentasiloxane is added, and the mixture is used at 5000 rpm using a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd., TK ROBOMICS). Dispersed for 5 minutes. This dispersion was applied onto a TAC film with an applicator so as to have a film thickness of 25.4 μm, and the transmittance was measured at a wavelength of 275 nm to 750 nm using a spectrophotometer (manufactured by JASCO Corporation, V-660). did. The results are shown in Table 1. It was found that the dispersion of the present invention was excellent in ultraviolet shielding ability and had the same visible light transmittance.

  The present invention is a powder having a heat-fixed coating of two layers, and is excellent in long-term oil dispersion stability, hydrophobic stability, etc., and therefore, cosmetics, plastic additives, inks, paints, and toners Widely used in various fields such as (magnetic powder, external additives), chemical fibers, packaging materials, electronic materials, etc.

Claims (5)

The powder and the first coating organic compound are pulverized in an airflow pulverizer and then heat-treated at a temperature of 100 to 200 ° C. in an inert atmosphere to form a first heat-fixed coating on at least a part of the powder surface. And a process of
The powder obtained in the above step and the second coating organic compound are pulverized in an airflow pulverizer , and then heat-treated at a temperature of 100 to 200 ° C. in an inert atmosphere , so that the top of the first heat fixed coating is obtained. Forming a second heat-fixed coating on at least a part of the coating powder. The first coating organic compound is at least one selected from polysiloxane, alkoxysilane, alkylsilane, fatty acid or salt thereof, polyolefin, hydrogenated lecithin or salt thereof, N-acylamino acid or salt thereof, and dextrin fatty acid ester. The manufacturing method of the coating powder of Claim 1 . The second coating organic compound is at least one selected from polysiloxane, alkoxysilane, alkylsilane, fatty acid or salt thereof, polyolefin, hydrogenated lecithin or salt thereof, N-acylamino acid or salt thereof, and dextrin fatty acid ester. The manufacturing method of the coating powder of Claim 1 . The method for producing a coated powder according to claim 1 , wherein the first coated organic compound is at least a methylhydrogensiloxane-dimethylsiloxane copolymer, and the second coated organic compound is at least dimethylpolysiloxane. A method for producing a dispersion containing a coated powder, wherein the coated powder produced by the method according to any one of claims 1 to 4 is kneaded or mixed and dispersed in a lipophilic dispersion medium at a concentration of 10 to 75% by weight. .