Surface treatment agent for powder, surface-treated powder and powder composition containing same, composite powder and powder composition containing same, method for producing powder, and method for surface-treating powder

Abstract

The present invention provides a surface treatment agent for powder that can be used to prepare a hydrophobized powder having a good texture. The present invention relates to a powder comprising (A) an oil gelling agent and (B) at least one molten mixture selected from acylamino acids or salts and fatty acid metal salts thereof.

Description

Surface treatment agent for powder, surface-treated powder and powder composition containing same, composite powder and powder composition containing same, method for producing powder, and method for surface-treating powder

[0001] The present invention relates to a surface treatment agent for powder, a surface-treated powder and a powder composition containing the same, a composite powder and a powder composition containing the same, a method for producing powder, and a method for surface-treating powder.

[0002] Silicone-treated powders are popular and widely used due to their pleasant feel and water-repellent properties (Patent Documents 1 and 2). However, in recent years, interest in reducing environmental impact has grown, and there has been a trend toward silicone-free products. Alternatives to conventional silicone treatments are being sought that offer properties such as adhesion, water-repellency, and minimal agglomeration due to treatment. Furthermore, N-acylamino acids and their salts have been used as treatments with excellent biodegradability (Patent Document 3). However, the use of N-acylamino acids as treatments poses performance and feel challenges. Furthermore, gelling agents are used in cosmetics such as lipstick (Patent Documents 4 and 5). However, gelling agents lack water-repellency, produce a distinctive squeaky feeling, and pose feel challenges.

[0003] Japanese Patent No. 2719303 Japanese Patent Laid-Open No. 7-196946 Japanese Patent Laid-Open No. 58-72512 Japanese Patent Laid-Open No. 2002-316971 Japanese Patent Laid-Open No. 2017-214314

[0004] An object of the present invention is to provide a surface treatment agent for powder that can be used to prepare hydrophobic powders that have a good feel.

[0005] As a result of extensive research, the present inventors have found for the first time that the above-mentioned problems can be solved by using an oil gelling agent and an acylamino acid or a salt thereof, and have completed the present invention based on this finding. That is, the present invention is as follows. [1] A powder containing a molten mixture of (A) an oil gelling agent and (B) one or more selected from an acylamino acid or a salt thereof and a fatty acid metal salt. [2] The powder according to [1] above, wherein the mass ratio ((A):(B)) of (A) the oil gelling agent and (B) the acylamino acid or a salt thereof is 10:90 to 80:20. [3] The powder according to [1] or [2] above, wherein the (A) oil gelling agent contains an acylamino acid dialkylamide. [4] The powder according to any one of [1] to [3] above, further containing (C) an oil agent. [5] The powder according to [4] above, wherein the (C) oil agent has polarity. [6] The powder according to any one of [1] to [5], having an average particle size of 1 μm to 200 μm. [7] A surface treatment agent for powder, comprising the powder according to any one of [1] to [6]. [8] A surface treatment agent for powder, comprising (A) an oil gelling agent and (B) one or more selected from an acylamino acid or a salt thereof and a fatty acid metal salt. [9] The surface treatment agent according to [8], which is a surface treatment agent for treating powder by melting and pulverizing.

[10] The surface treatment agent according to [8] or [9], further comprising at least one selected from (C) an oil agent, (D) a nonionic surfactant, and (E) a polyol.

[11] The surface treatment agent according to

[10] , wherein the oil agent (C) has polarity.

[12] The surface treatment agent according to

[10] , wherein the organicity value of the nonionic surfactant (D) is 300 to 2800.

[13] A powder surface-treated with the surface treatment agent according to any one of [7] to

[12] above.

[14] A powder composition comprising the powder according to

[13] above.

[15] A composite powder comprising the surface treatment agent according to any one of [7] to

[12] above and a powder, wherein the surface treatment agent is present on the surface of the powder.

[16] A powder composition comprising the composite powder according to

[15] above.

[17] A method for producing a surface-treated powder, comprising the following step (X): Step (X): mixing the surface treatment agent for powder according to any one of [7] to

[12] above with a powder.

[18] The production method according to

[17] above, wherein the step (X) is carried out under conditions of 95°C or less.

[19] The production method according to

[17] or

[18] above, wherein the step (X) does not include heating using a heating device.

[20] A method for surface treating a powder, comprising the following step (X): Step (X): mixing a powder surface treatment agent containing (A) an oil gelling agent and (B) an acylamino acid or a salt thereof with the powder.

[21] The method according to

[20] above, wherein the step (X) is carried out under conditions of 95°C or less.

[22] The method according to

[20] or

[21] above, wherein the step (X) does not include heating using a heating device.

[0006] The powder surface treatment agent of the present invention comprises (A) an oil gelling agent and (B) one or more selected from an acylamino acid or a salt thereof and a fatty acid metal salt. The powder surface treatment agent of the present invention can be used for powder surface treatment and is preferably melted and powdered before use. The average particle size of the powdered powder surface treatment agent is preferably 1 μm to 200 μm, more preferably 5 μm to 150 μm. The average particle size of the powdered powder surface treatment agent may be 106 μm or less or 180 μm or less. The average particle size may be the average particle size of a number-based distribution or the average particle size of a volume-based distribution. Here, the average particle size of the volume-based distribution of the powder surface treatment agent is specified according to JIS standard (Z8819-2:2019). The powder surface treatment agent of the present invention may also comprise a powder comprising a molten mixture of (A) an oil gelling agent and (B) one or more selected from an acylamino acid or a salt thereof and a fatty acid metal salt.

[0007] The powder to be surface-treated with the surface treatment agent is not particularly limited as long as it is used for industrial purposes or cosmetics (pigments, coloring matter, resins, pearls), and examples thereof include organic powders and inorganic powders. Examples of inorganic powders include yellow iron oxide, red iron oxide, black iron oxide, fine iron oxide particles, bismuth oxychloride, zirconium oxide, magnesium oxide, chromium oxide, cobalt oxide, tin oxide, carbon black, ultramarine, Prussian blue, zinc oxide, fine zinc oxide particles, titanium oxide, fine titanium oxide particles, silica, porous silica, hollow silica, alumina, cerium oxide, boron nitride, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate, magnesium silicate, silicon carbide, pigments, lake, sericite, mica, talc, sericite, synthetic fluorphlogopite, kaolin, clay, bentonite, plate-shaped barium sulfate, butterfly-shaped barium sulfate, and hydroxyapatite. These may be used alone or in combination of two or more. The inorganic powder may further be a composite of the above-mentioned inorganic powders (for example, silica-coated titanium oxide, mica-coated titanium oxide, titanium-coated mica), or may be the above-mentioned inorganic powders that have been surface-treated with silicone, a fluorine compound, a silane coupling agent, a silane, an organic titanate, a fatty acid, an acylamino acid (for example, stearoyl glutamic acid), a metal soap (for example, aluminum stearate), an oil agent, an amino acid, or the like (for example, silicone-treated talc, silicone-treated mica, silicone-treated sericite, silicone-treated titanium oxide, silicone-treated red iron oxide, silicone-treated yellow iron oxide, silicone-treated black iron oxide, stearoyl glutamic acid-treated titanium oxide, stearoyl glutamic acid-treated yellow iron oxide, stearoyl glutamic acid-treated red iron oxide, stearoyl glutamic acid-treated black iron oxide, and aluminum stearate-treated titanium oxide).

[0008] The powder used in the surface treatment method of the present invention is not particularly limited as long as it is used for industrial purposes or cosmetics (pigments, coloring matters, resins, pearls), and examples thereof include resin powders such as nylon powder, nylon beads, silicone beads, and polyethylene beads; metal oxides such as iron oxide (yellow pigment), iron oxide (red pigment), iron oxide (black pigment), tin oxide, chromium oxide, cobalt oxide, zinc oxide, pigment-grade zinc oxide, titanium oxide, pigment-grade titanium oxide, zirconium oxide, aluminum oxide, cerium oxide, fine particle titanium oxide, ultrafine particle titanium oxide, fine particle zinc oxide, and fine particle iron oxide; silicon-containing powders such as silicon oxides such as silicates (silicate (Al / Ca / Na), silicate (Na / Mg)), sericite, mica, talc, kaolin, bentonite, aluminum silicate, magnesium silicate, cubic sodium aluminosilicate, silicon carbide, hydrous silica, and anhydrous silica (leaf-shaped silica, nonporous silica, porous silica, porous silica, semiporous silica, etc.); Examples of suitable powders include metal fatty acid soaps such as magnesium stearate, magnesium myristate, and zinc stearate, carbon-containing powders such as cellulose, cellulose particles, starch, corn starch, rice starch, potato starch, wheat flour, wood powder, carbon black, graphite, ultramarine, Prussian blue, and carmine; lauroyl lysine; metal salts such as barium sulfate, platy barium sulfate, butterfly-shaped barium sulfate, calcium carbonate, and magnesium carbonate; fluorine-containing powders such as synthetic phlogopite (synthetic mica) and synthetic phlogopite iron; boron-containing powders such as boron nitride; composite powders such as pearl powders, colored pearl pigments, and titanium mica; waxes, pigments, and lakes. Furthermore, the powders may be surface-treated, for example, with silicone, a fluorine compound, a silane coupling agent, a silane, an organic titanate, a fatty acid, a metal soap, an oil, or an amino acid. Crystalline or amorphous powders such as resin powders, silicon-containing powders, metal oxides, carbon-containing powders, fluorine-containing powders, metal salts, boron-containing powders, and composite powders are preferred in terms of improving water repellency and oil repellency after treatment.Preferred powders include, for example, talc, mica, sericite, titanium oxide, red iron oxide, yellow iron oxide, black iron oxide, pearl powder, and colored pearl pigments.The powder may preferably be a powder containing, for example, talc, mica, sericite, kaolin, silica, cellulose, crystalline cellulose, lauroyl lysine, synthetic fluorphlogopite, titanium oxide, iron oxide, tin oxide, or zinc oxide, and may preferably be a powder that is not treated with silicone.

[0009] As the silica, spherical or amorphous silica can be used, each of which may be porous, non-porous, hollow, or the like. Non-porous spherical silica and porous spherical silica are preferred, and porous spherical silica is more preferred. The average particle size of the volume-based distribution of silica is preferably 1 to 50 μm, more preferably 3 to 20 μm, and even more preferably 5 to 12 μm. Here, the average particle size of the volume-based distribution of silica is specified as per JIS standard (Z8819-2:2019). Silica is commercially available, and examples of such silica include porous silica beads SB-300 and SB-700 manufactured by Miyoshi Kasei Co., Ltd., and Sunsphere H-31, H-51, H-121, L-31, and L-51 manufactured by AGC Si-Tech Co., Ltd. Examples of organic powders include polylactic acid, polyhydroxybutyric acid (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), polyglycolic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyethylene terephthalate succinate, and polybutylene adipate terephthalate. These powders are commercially available, and examples of such powders include Ecosoft 608XF, Ecosoft 608, Biosoft 915, and Naturematte 31 manufactured by Micro Powders, and Techpolymer BIO EF-A manufactured by Sekisui Plastics Co., Ltd. Other examples of organic powders include proteins, hydroxycarboxylic acid polyesters, polyhydroxyalkanoic acids, diolcarboxylic acid polyesters, and alginic acid. Examples of proteins include silk, wool, and feathers. As the protein powder, silk powder is preferred. The silk powder is not particularly limited, and silk powder obtained by a known method can be used. Silk powder is commercially available, and examples that can be used include silk powder manufactured by Izumi Senko Co., Ltd., N-Fibroin manufactured by Nagasuna Mayu Co., Ltd., and Silkgen G powder manufactured by Ichimaru Falcos Co., Ltd. Examples of the hydroxycarboxylic acid polyester include polylactic acid, polyglycolic acid, polycaprolactone, and glycolic acid-caprolactone copolymer.Examples of the polyhydroxyalkanoic acid include polyhydroxybutyric acid (PHB), polyhydroxyvaleric acid, poly(3-hydroxybutyrate-co-3-hydroxyvaleric acid) (PHBV), polyhydroxycaproic acid, polyhydroxycaprylic acid, PHBH composed of R-3-hydroxybutanoic acid (3HB) and R-3-hydroxyhexanoic acid (3HH), and modified polyvinyl alcohol. Examples of the diol carboxylic acid polyester include polyethylene succinate, polybutylene succinate, polyethylene terephthalate succinate, and polybutylene adipate terephthalate. Examples of the alginic acid include calcium alginate. Other examples of organic powders include cellulose, starch, modified starch, cellulose derivatives, and chitosan. Cellulose and starch are preferred, and cellulose is more preferred. Examples of the cellulose include plate-shaped cellulose, spherical cellulose, and amorphous cellulose. Examples of plate-shaped cellulose include plate-shaped crystalline cellulose and needle-shaped crystalline cellulose, with plate-shaped crystalline cellulose being preferred. Examples of spherical cellulose include spherical crystalline cellulose and noncrystalline cellulose. Examples of spherical cellulose include nonporous cellulose and porous cellulose, with nonporous cellulose being preferred. Here, spherical includes true spherical, nearly spherical, and elliptical. Cellulose registered under the INCI name of crystalline cellulose, cellulose acetate, or lignin can be used. Cellulose can also be commercially obtained, and examples include TEGO Feel Green manufactured by Evonik and CELLULOBEADS D-10 and CELLULOBEADS D-5 manufactured by Daito Chemical Industry Co., Ltd. can be used. Examples of the starch include starches derived from rice, corn, potato, tapioca, barley, etc., as well as pregelatinized starches and partially pregelatinized starches thereof. Starches derived from tapioca, barley, and rice are preferred. The shape of the starch may be spherical or irregular, and is preferably spherical. Here, spherical includes true sphere, nearly sphere, and ellipse.Starch is commercially available, and examples thereof include tapioca-derived starch such as Tapioca Natural 9096 manufactured by AGRANA, TAPIOCA PURE manufactured by Nouryon Japan, and A60012 ORGANIC TAPIOCA STARCH POWDER manufactured by Active Concepts, barley-derived starch such as Barley Natural manufactured by AGRANA, and rice-derived starch such as Fine Snow IR manufactured by Joetsu Starch and Resista Natural manufactured by AGRANA. Examples of modified starches include starch phosphate and alkylated starch, and examples of cellulose derivatives include cellulose acetate. Examples of chitosan include those derived from crab, shrimp, or krill. Preferably, chitosan is derived from crab or shrimp. Chitosan is commercially available, for example, K45 manufactured by Izumi Senko Co., Ltd., which is chitosan derived from the shell of red snow crab. The powder preferably contains silica, starch, cellulose, etc. The powder preferably contains porous silica. The powder preferably contains spherical silica. The oil absorption of the powder is preferably 10 ml / g or more, more preferably 25 to 300 ml / g. The oil absorption of the powder is measured by the refined linseed oil method (JIS K 5101-13-1:2004).

[0010] The oil gelling agent (A) is not particularly limited as long as it has a hydrogen-bonding unit, and examples thereof include amino acid-based oil gelling agents and sugar fatty acid esters. Specific examples of oil gelling agents include dibutyl ethylhexanoyl glutamide (EB-21), dibutyl lauroyl glutamide (GP-1), stearoyl glutamic acid (HA-P), lauroyl glutamic acid (LA-D), and dextrin palmitate (Leopearl KL2). Preferred oil gelling agents are amino acid-based oil gelling agents (oil gelling agents that are amino acid derivatives), with acyl amino acid dialkylamides being more preferred, and dibutyl lauroyl glutamide being most preferred. Furthermore, preferred oil gelling agents are those with a water / octanol partition coefficient of Log 2 or greater. The water / octanol partition coefficient can be measured in accordance with OECD Test Guideline 117 "Measurement of partition coefficient (1-octanol / water): High-performance liquid chromatography (HPLC) method."

[0011] With regard to the acylamino acid or salt thereof of component (B), examples of the acylamino acid include N-acylamino acids having an acyl group with a carbon chain length of C8 to C22. The amino acid component constituting the N-acylamino acid having an acyl group with a carbon chain length of C8 to C22 may be any of acidic, neutral, and basic amino acids, and may also be any of α-, β-, and ε-amino acids. Preferred acylamino acids are acyl acidic amino acids. Examples include glycine, β-alanine, α-alanine, proline, valine, leucine, phenylalanine, 3,4-dioxyphenylalanine, serine, threonine, methionine, lysine, ornithine, arginine, histidine, ε-aminocaproic acid, glutamic acid, and aspartic acid. Glycine, β-alanine, α-alanine, proline, threonine, lysine, arginine, glutamic acid, and aspartic acid are more preferred, glycine, β-alanine, α-alanine, threonine, glutamic acid, and aspartic acid are more preferred, glutamic acid and aspartic acid are even more preferred, and glutamic acid is most preferred. When an amino acid component having multiple amino groups (including imino groups) is used, it is sufficient that at least one amino group is acylated. For example, all of the amino groups may be acylated with multiple types of acyl components, or may be in the form of a mono-N-acyl derivative. Examples of the acyl component constituting the N-acyl group of an N-acylamino acid having an acyl group with a carbon chain length of C8 to C22 include acyl groups derived or derivable from linear or branched, saturated or unsaturated fatty acids having 8 to 22 carbon atoms, such as single fatty acid acyl groups such as octanoyl, caproyl, nonanoyl, caprinoyl, decanoyl, undecanoyl, lauroyl, myristoyl, palmitoyl, stearoyl, behenoyl, palmitoleoyl, oleoyl, and linoleoyl, as well as naturally occurring mixed fatty acid acyl groups such as coconut oil fatty acid acyl and hardened beef tallow fatty acid acyl, as well as aromatic carboxylic acid acyl groups such as benzoic acid acyl. While such acyl groups can be derived from fatty acids, they can also be derived from raw materials other than fatty acids (fatty acid esters, fatty acid salts, acid halides, acid anhydrides, etc.).The acyl component constituting the N-acyl group of an N-acylamino acid having an acyl group with a carbon chain length of C8 to C22 is preferably an acyl group derived or derivable from a saturated fatty acid, and is also preferably a straight-chain acyl group. N-acylamino acids having an acyl group with a carbon chain length of C12 to C22 are preferred, N-acylamino acids having an acyl group with a carbon chain length of C12 to C18 are more preferred, and N-acylamino acids having an acyl group with a carbon chain length of C14 to C18, C16 to C18, or C18 may also be used. The acyl amino acid is preferably at least one selected from the group consisting of N-lauroylglutamic acid, N-myristoylglutamic acid, N-palmitoylglutamic acid, N-stearoylglutamic acid, and N-cocoylglutamic acid. Salts of N-acylamino acids having an acyl group with a carbon chain length of C8 to C22 include pharmacologically acceptable salts, such as alkali metal salts such as lithium salts, sodium salts, and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; ammonium salts; basic organic salts; and triethanolamine salts. Of these, from the viewpoint of solubility, sodium salts, potassium salts, and ammonium salts are preferred, sodium salts and potassium salts are more preferred, and sodium salts are even more preferred. In addition, in the case of polybasic acids such as dibasic acids, either monosalts (monosodium glutamate, etc.) or di-salts (disodium glutamate, etc.) can be used.Specific examples of N-acylamino acids or salts thereof having an acyl group with a carbon chain length of C8 to C22 include lauroyl glutamic acid, sodium lauroyl glutamate, potassium lauroyl glutamate, myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, potassium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, potassium stearoyl glutamate, sodium oleoyl glutamate, potassium oleoyl glutamate, cocoyl glutamic acid, disodium cocoyl glutamate, and the like, and preferred are lauroyl glutamic acid, sodium lauroyl glutamate, Examples of the N-acylamino acid include potassium lauroyl glutamate, myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, potassium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and potassium stearoyl glutamate, and more preferably myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, potassium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and potassium stearoyl glutamate. The use of these N-acyl amino acids can improve the oil dispersibility of the treated powder. The salt of the acylamino acid may be added as the salt of the acylamino acid, or the chloride corresponding to the acylamino acid may be added.

[0012] Examples of the fatty acid metal salt of component (B) include metal salts of fatty acids having a carbon chain length of C8 to C22. By incorporating one or more selected from metal salts of fatty acids having a carbon chain length of C8 to C22, the oil dispersibility of the treated powder can be improved. Examples of fatty acids having a carbon chain length of C8 to C22 include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, arachidic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, erucic acid, hardened beef tallow fatty acid, coconut oil fatty acid, and palm oil fatty acid. From the viewpoint of increasing the melting point, saturated fatty acids having a carbon chain length of C8 to C22 are preferred, and straight-chain saturated fatty acids having a carbon chain length of C8 to C22 are more preferred. Fatty acids having a carbon chain length of C8 to C22 are preferably lauric acid, myristic acid, palmitic acid, and stearic acid, more preferably myristic acid, palmitic acid, and stearic acid, and even more preferably palmitic acid and stearic acid. Fatty acids having a carbon chain length of C8 to C20 are preferred, fatty acids having a carbon chain length of C14 to C18 are more preferred, fatty acids having a carbon chain length of C16 to C18 are even more preferred, and fatty acids having a carbon chain length of C18 are even more preferred. Furthermore, salts of fatty acids having a carbon chain length of C8 to C22 include pharmacologically acceptable salts, such as alkali metal salts such as lithium salts, sodium salts, and potassium salts; alkaline earth metal salts such as calcium salts, magnesium salts, and barium salts; aluminum salts; zinc salts; ammonium salts; basic organic salts, and triethanolamine salts. As salts of fatty acids having a carbon chain length of C8 to C22, divalent metal salts are preferred from the viewpoint of increasing the melting point. The metal salt is preferably a lithium salt, a calcium salt, a magnesium salt, a barium salt, an aluminum salt, a zinc salt, or the like, with calcium salts, magnesium salts, and zinc salts being more preferred.Preferred examples of fatty acid metal salts include zinc laurate, magnesium laurate, calcium laurate, zinc myristate, magnesium myristate, calcium myristate, zinc palmitate, magnesium palmitate, calcium palmitate, zinc stearate, magnesium stearate, and calcium stearate.

[0013] The mass ratio ((A):(B)) of the oil gelling agent (A) to the component (B) (one or more selected from an acylamino acid or a salt thereof and a fatty acid metal salt) is preferably 10:90 to 80:20, more preferably 15:85 to 80:20, even more preferably 20:80 to 75:25, particularly preferably 25:75 to 70:30, and most preferably 30:70 to 68:32.

[0014] The powder surface treatment agent and the molten mixture contained in the powder of the present invention may further contain (C) an oil. The (C) oil is not particularly limited, but is preferably a fatty acid, a fatty alcohol, or a fatty ester. The fatty acid is more preferably a saturated fatty acid. The fatty alcohol is more preferably a saturated aliphatic alcohol. The aliphatic ester is preferably a fatty acid ester, more preferably a saturated fatty acid ester, and specifically includes glycerin fatty acid ester, isononanoic acid ester, and myristate ester, with isononanoic acid ester being preferred. The glycerin fatty acid ester is preferably a triester, more preferably a triglyceride of a fatty acid having 20 to 28 carbon atoms. Specific examples of isononanoic acid esters include isononyl isononanoate, tridecyl isononanoate, isotridecyl isononanoate, and ethylhexyl isononanoate. Specific examples of myristate esters include isopropyl myristate, isocetyl myristate, and octyldodecyl myristate. Furthermore, aliphatic alcohols and fatty acids having a carbon chain length of C18 to C22 are more preferred. Specific examples of the (C) oil include preferably hexyldecanol, isostearyl alcohol, octyldodecanol, oleyl alcohol, propylene glycol, butylene glycol, pentylene glycol, isostearic acid, cetyl alcohol, and behenyl alcohol, more preferably butylene glycol, octyldodecanol, isostearic acid, isostearyl alcohol, cetyl alcohol, and behenyl alcohol, and even more preferably isostearic acid, isostearyl alcohol, octyldodecanol, and behenyl alcohol. The (C) oil preferably has polarity. The (C) oil may also be solid at 25°C and have a melting point of 70°C or higher. The content of the oil (C) in the powder containing the surface treatment agent and the molten mixture of the powder is preferably 80% by mass or less, more preferably 75% by mass or less, even more preferably 55% by mass or less, still more preferably 30% by mass or less, and even more preferably 13% by mass or less.The content of the oil (C) in the powder containing the surface treatment agent for the powder and the molten mixture is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and still more preferably 1% by mass or more. The content of the oil (C) in the powder containing the surface treatment agent for the powder and the molten mixture may be any of the above-mentioned consistent combinations, for example, 0.05% by mass to 80% by mass, 0.05% by mass to 75% by mass, 0.05% by mass to 55% by mass, 0.05% by mass to 30% by mass, 0.05% by mass to 30% by mass, 0.05% by mass to 13% by mass, 0.1% by mass to 80% by mass, 0.1% by mass to 75% by mass, 0.1% by mass to 5 ... Mass% to 30 mass%, 0.1 mass% to 30 mass%, 0.1 mass% to 13 mass%, 0.5 mass% to 80 mass%, 0.5 mass% to 75 mass%, 0.5 mass% to 55 mass%, 0.5 mass% to 30 mass%, 0.5 mass% -30% by mass, 0.5% by mass - 13% by mass, 1% by mass - 80% by mass, 1% by mass - 75% by mass, 1% by mass - 55% by mass, 1% by mass - 30% by mass, 1% by mass - 30% by mass, 1% by mass - 13% by mass.

[0015] The powder surface treatment agent and the molten mixture contained in the powder of the present invention may further contain (D) a nonionic surfactant. The (D) nonionic surfactant is not particularly limited, but may be a fatty acid derivative nonionic surfactant or a glyceryl group-containing nonionic surfactant. Examples of fatty acid derivative nonionic surfactants include polyhydroxystearic acid. Examples of glyceryl group-containing nonionic surfactants include one or more selected from alkyl glyceryl ethers, glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene glyceryl ether fatty acid esters, polyoxyethylene hydrogenated castor oil, and polyoxyethylene hydrogenated castor oil fatty acid esters. The HLB of the (D) nonionic surfactant is preferably 3 to 9, more preferably 4 to 9, and even more preferably 5 to 8. The organic value of the (D) nonionic surfactant is preferably 300 to 2800, more preferably 350 to 2600. The content of the nonionic surfactant (D) in the powder containing the surface treatment agent for the powder and the molten mixture is preferably 80% by mass or less, more preferably 75% by mass or less, even more preferably 55% by mass or less, still more preferably 30% by mass or less, and even more preferably 13% by mass or less. The content of the nonionic surfactant (D) in the powder containing the surface treatment agent for the powder and the molten mixture is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and still more preferably 1% by mass or more.The content of the nonionic surfactant (D) in the powder containing the surface treatment agent for the powder and the molten mixture may be any of the above-mentioned compatible combinations, and may be, for example, 0.05% by mass to 80% by mass, 0.05% by mass to 75% by mass, 0.05% by mass to 55% by mass, 0.05% by mass to 30% by mass, 0.05% by mass to 30% by mass, 0.05% by mass to 13% by mass, 0.1% by mass to 80% by mass, 0.1% by mass to 75% by mass, or 0.1% by mass to 55% by mass. , 0.1 mass% to 30 mass%, 0.1 mass% to 30 mass%, 0.1 mass% to 13 mass%, 0.5 mass% to 80 mass%, 0.5 mass% to 75 mass%, 0.5 mass% to 55 mass%, 0.5 mass% to 30 mass%, 0.5 mass% % to 30 mass%, 0.5 mass% to 13 mass%, 1 mass% to 80 mass%, 1 mass% to 75 mass%, 1 mass% to 55 mass%, 1 mass% to 30 mass%, 1 mass% to 30 mass%, 1 mass% to 13 mass%.

[0016] The powder surface treatment agent and the molten mixture contained in the powder of the present invention may further contain (E) a polyol. The (E) polyol is not particularly limited, but examples thereof include glycerin, pentanediol, dipropylene glycol, 1,3-butylene glycol, pentylene glycol, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, trimethylolpropane, triethanolamine, pentaerythritol, diglycerin, xylose, sorbitan, xylitol, triglycerin, glucose, fructose, sorbitol, malbitol, tetraglycerin, polyglycerin, sucrose, trehalose, and lactose. , maltotriose, etc., preferably glycerin, pentanediol, dipropylene glycol, 1,3-butylene glycol, and pentylene glycol, more preferably glycerin, pentanediol, dipropylene glycol, 1,3-butylene glycol, and pentylene glycol, even more preferably glycerin, pentanediol, dipropylene glycol, 1,3-butylene glycol, and pentylene glycol, and even more preferably 1,3-butylene glycol and pentylene glycol. Furthermore, the polyol is preferably a polyol having 3 to 6 carbon atoms, more preferably a polyol having 3 to 5 carbon atoms, and in particular may be a polyol having 5 carbon atoms. The polyol is preferably a dihydric or trihydric polyol, more preferably a dihydric polyol. The content of the polyol (E) in the powder surface treatment agent and the molten mixture contained in the powder is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 11% by mass or less. The content of the polyol (E) in the surface treatment agent for the powder and in the molten mixture contained in the powder is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more.The content of the surface treatment agent for the powder and the content of the polyol (E) in the molten mixture contained in the powder may be any of the above-mentioned compatible combinations, and may be, for example, 0.05% by mass to 20% by mass, 0.05% by mass to 15% by mass, 0.05% by mass to 11% by mass, 0.1% by mass to 20% by mass, 0.1% by mass to 15% by mass, or 0.1% by mass to 11% by mass.

[0017] The total content of the (A) oil gelling agent and (B) acylamino acid or a salt thereof in the surface treatment agent for the powder and the molten mixture contained in the powder is preferably 25% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass. The total content of the (C) oil agent, (D) nonionic surfactant, and (E) polyol in the surface treatment agent for the powder and the molten mixture contained in the powder is preferably 80% by mass or less, more preferably 75% by mass or less, even more preferably 55% by mass or less, and most preferably 13% by mass or less.

[0018] The surface-treated powder can be obtained by a manufacturing method including a step (X) of mixing the powder surface treatment agent with the powder to be surface-treated. That is, defined from another aspect, the method for surface-treating the powder to be surface-treated includes step (X). In this manufacturing method, the surface treatment agent for the powder may be melted and powdered. Step (X) is preferably carried out under conditions of 95°C or less, more preferably under conditions of 0°C or higher and 70°C or lower. Furthermore, step (X) preferably includes a step of contacting the powder surface treatment agent with the powder to be surface-treated at a temperature of 95°C or lower, and stirring for 1 minute to 60 minutes. The mixing may be carried out using a mixer selected from high-speed agitation mixers such as a Nauta mixer, Henschel mixer, conical dryer, planetary mixer, FM mixer, high-shear mixer, vertical mixer, and planetary mixer, agitation mixer granulators such as a vertical granulator and a high-speed mixer, container rotation mixers or container rotation mixers with agitators such as a W-type mixer, CV-type mixer, V-type mixer, rocking mixer, container mixer, Bohle mixer, and container mixer with chopper, paddle mixer, ribbon agitation type, double-shaft paddle type, double-shaft planetary agitation type, Nauta mixer, conical screw type mechanical agitation mixer, airflow agitation mixer, Julia mixer, and Nobilta, etc. Step (X) preferably does not include heating using a heating device.

[0019] Furthermore, the composite powder of the present invention is one in which the powder surface treatment agent is present on the surface of the powder to be surface-treated. The powder surface treatment agent of the present invention is used in an amount of 0.1 parts by mass or more, preferably 0.2 parts by mass or more, more preferably 1.0 parts by mass or more, even more preferably 1.7 parts by mass or more, still more preferably 3 parts by mass or more, and most preferably 5 parts by mass or more, per 100 parts by mass of the powder. The powder surface treatment agent of the present invention is used in an amount of 50 parts by mass or less, preferably 30 parts by mass or less, and even more preferably 15 parts by mass or less, per 100 parts by mass of the powder. The powder surface treatment agent of the present invention may be used in an amount of 0.1 to 50 parts by mass, 0.2 to 30 parts by mass, 1.0 to 30 parts by mass, 1.7 to 30 parts by mass, 3 to 30 parts by mass, or 5 to 30 parts by mass, relative to 100 parts by mass of the powder. It may also be used in an amount of 0.1 to 15 parts by mass, 0.2 to 15 parts by mass, 1.0 to 15 parts by mass, 1.7 to 15 parts by mass, 3 to 15 parts by mass, or 5 to 15 parts by mass. By using the powder surface treatment agent of the present invention in such an amount, it is possible to further improve multiple properties of the treated powder selected from hydrophobicity, makeup longevity, adhesion to the skin, evenness, and a good feel when used, such as a smooth feel. The composite powder of the present invention may preferably be a composite powder that is not silicone-treated.

[0020] The powder composition of the present invention contains the surface-treated powder or the composite powder. Such a powder composition can be formulated into any form of cosmetic that can be applied to a desired area (e.g., skin, hair, scalp, lips, eyes, eyelashes, eyelids, nails) using conventional methods. Examples of cosmetics for skin, lips, eyelashes, and nails include sunscreens such as sunscreens, body powders, and sprays; makeup cosmetics such as foundations, primers, body colors, bronzers, face powders, nail polishes, cheek colors, makeup bases, and concealers; lip cosmetics such as lip colors, lip liners, and lipsticks; eye makeup cosmetics such as eyeliners, eye shadows, eyebrow makeup, and mascara; leave-on cosmetics such as emulsions, lotions, creams, gels, and serums; and face masks. Examples of cosmetics for hair include hair styling agents, hair emulsions, hair treatments, hair conditioners, and hair lotions. Examples of cosmetics for the scalp include hair growth agents. Preferable cosmetics include, for example, makeup cosmetics, eye makeup cosmetics, lip cosmetics, and leave-on cosmetics. Preferable topical preparations include, for example, ointments, creams, mousses, and gels.

[0021] Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[0022] Test Example 1: Preparation of Compositions (Comparative Examples 1, 10, and 11) The (A) oil gelling agent or comparative component listed in Table 1 was used in Test Example 2 without any prior processing. (Examples 1 to 3, Comparative Example 2, and Examples 19 to 26) The (A) oil gelling agent and (B) component listed in Table 1 or Table 2 were weighed, heated, mixed, and dissolved. After dissolution, the composition was allowed to cool and solidify. The resulting composition was placed in a 75 mL mill and mixer (Tescom Co., Ltd., TML162) and stirred and pulverized for approximately 8 minutes. The resulting coarse powder was sieved through a 106 μm mesh to obtain a powder composition. (Comparative Example 3) The (A) oil gelling agent and (B) component listed in Table 1 were heated and mixed in the same manner as in Examples 1 to 3, but the mixture did not dissolve or become homogeneous, and remained inhomogeneous even after cooling. Therefore, the pulverization and sieving of the composition as in Examples 1 to 3 and the steps of Test Example 2 were not performed. (Comparative Example 4) The (A) oil gelling agent and (B) component listed in Table 1 were each weighed out in the same composition as in Example 3, and heated, mixed, and dissolved. After dissolution, the composition was allowed to cool and solidify, which was then placed in a 75 mL mill and mixer (Tescom Co., Ltd., TML162) and stirred and pulverized for approximately 1 minute to obtain a composition. (Comparative Example 5) The (A) oil gelling agent and (B) component listed in Table 1 were each weighed out in the same composition as in Example 1, and simply mixed in a mill and mixer to obtain a composition. (Examples 4 to 5, 38, and 39 and Comparative Examples 6 and 9) The (A) oil gelling agent, (B) component, and (C) oil or (E) polyol listed in Table 1 or 3 were each weighed out, heated, mixed, and dissolved. After dissolution, the composition was allowed to cool and solidify, which was then placed in a 75 mL mill and mixer (Tescom Co., Ltd., TML162) and stirred and pulverized for approximately 1 minute to obtain a powder composition. (Examples 6 to 8 and Comparative Example 7) The (A) oil gelling agent, (B) component, (C) oil agent, and (E) polyol listed in Table 1 were each weighed, heated, mixed, and dissolved, and then allowed to cool, to obtain a semi-solid composition with no fluidity. (Comparative Example 8) The (A) oil gelling agent, (B) component, (C) oil agent, and (E) polyol listed in Table 1 were dissolved using the same composition and production method as in Example 7, and this composition was used in Test Example 2 in the form of a fluid liquid without being allowed to cool. (Examples 9 to 18) A powder composition was obtained using the same composition and production method as in Example 1.Examples 28-37: The (A) oil gelling agent, (B) component, and (C) oil or (D) nonionic surfactant listed in Table 3 were each weighed, heated, mixed, and dissolved in the same manner as in Example 3. After dissolution, the composition was allowed to cool and solidify, and then placed in a 75 mL mill and mixer (Tescom Co., Ltd., TML162), stirred, and pulverized for approximately 8 minutes. The resulting coarse powder was sieved through a 106 μm mesh to obtain a powder composition. Example 27: The (A) oil gelling agent and (B) component listed in Table 2 were each weighed, heated, mixed, and dissolved. After dissolution, the composition was allowed to cool and solidify, and then placed in a 75 mL mill and mixer (Tescom Co., Ltd., TML162), stirred, and pulverized for approximately 8 minutes. The resulting coarse powder was sieved through a 180 μm mesh to obtain a powder composition.

[0023] Test Example 2 Preparation of Treated / Composite Powders (Examples 1 to 39 and Comparative Examples 1 to 11) Each composition prepared in Test Example 1 or its comparative component and the various powder components listed in the table were charged into a 75 mL mill and mixer (TML162, manufactured by Tescom Co., Ltd.) and mixed to obtain each powder composition. (Comparative Example 12) Dimethicone-treated powder (manufactured by Miyoshi Chemicals Co., Ltd.) was used.

[0024] Test Example 3: Evaluation of physical properties and functionality of powder composition The following evaluations were carried out using the treated composite powder obtained in Test Example 2. [Evaluation of hydrophobicity of powder (water repellency test)] 20 mg of the composition of each Example and Comparative Example was added to 10 mL of water, and the appearance of the powder immediately after the addition to 60 minutes later was evaluated based on the following evaluation criteria. (Evaluation criteria) S: Satisfies A, and even after 6 hours, almost all of the powder floats on the water. A: Almost all of the powder floats on the water immediately afterwards, and there is no change even after 60 minutes. B: Almost all of the powder floats on the water immediately afterwards, but after 60 minutes, some of the powder sinks, or the water becomes slightly cloudy. C: Some of the powder sinks in the water between immediately afterwards and 60 minutes, and powder is clearly visible at the bottom of the container. [Water / oil partition test of powder (partition test (hydrocarbon / water))] 20 mg of the composition of the Examples and Comparative Examples was added to 5 mL of hydrocarbon oil (isododecane), and then 10 mL of water was added. The mixture was stirred five times, and the appearance of the powder was evaluated based on the following evaluation criteria. (Evaluation criteria) S: Almost all of the powder is present at the water-oil interface or in the oil layer, or adheres to the surface of oil droplets on the container wall. A: The water layer is transparent, with a small amount of powder sinking. B: The water layer is transparent, with scattered powder visible on the bottom of the container. C: The water layer is slightly cloudy, with scattered powder visible on the bottom of the container. D: The water layer is cloudy, with powder visible over the entire bottom of the container.

[0025] (Sensory evaluation of the feel of the powder composition (evaluation of the feel when used)) Approximately 6 mg of each powder composition was applied to the inside of the forearm or the back of the hand, and evaluated for feel when applied with the fingers. Four evaluators evaluated the feel of each powder composition on a 5-point scale according to the following rating criteria, based on the evaluation of only the powder used, in terms of smooth feel, moist feel, uniform application feel, and adhesion to the skin, and the total score for each was determined based on the following criteria. (Rating criteria) 6 points: Very favorable 5 points: Preferred 4 points: Somewhat favorable 3 points: Average 2 points: Somewhat unfavorable 1 point: Unfavorable (Evaluation criteria) S: 18 points or more A: 15-17 points B: 12-14 points C: 10-11 points D: 9 points or less

[0026]

[0027]

[0028]

[0029] Comparative Example 1 sank in water and had a squeaky, sticky feel, while Examples 1 to 3 and 9 to 27, in which (A) oil gelling agent and (B) component were mixed and dissolved and sieved to an average particle size of 106 μm or less or 180 μm or less, exhibited hydrophobic properties that allowed them to float on water for a long time and provided a good feel. Comparing Examples 1 to 3 and 22 to 25, Examples 22 and 23, in which a composition prepared using a cocoyl chain length was mixed with powder, provided a particularly excellent, smooth feel and a light feel when used. In Examples 2, 3, and 23, the powders floated on water even after 24 hours, confirming their enhanced hydrophobicity.

[0030] (Measurement of Average Dynamic Friction Coefficient of Composition) The composition was applied at a constant temperature and humidity (23°C, 40% relative humidity (RH)) at a density of 2.0 mg / cm using a Tribomaster (manufactured by Trinity Labs, product name: TL201Ts). 2 The composition was spread on artificial leather (Idemitsu Technofine Co., Ltd., thickness approximately 2 mm) so that the average coefficient of dynamic friction of each composition was measured. The measurement was repeated five times, and the average value of the three measurements, excluding the maximum and minimum, was calculated. The conditions were a load of 50 gf, a test table movement speed of 25 mm / sec, and a measurement distance of 25 mm, and a tactile contactor (Trinity Lab Co., Ltd., finger model fingerprint type) was used as the sensor. The average coefficient of dynamic friction of the compositions of Examples 1 to 3 and Examples 22 to 25 was 0.3 to 0.6.

[0031]

Claims

1. A powder comprising (A) an oil gelling agent and (B) a molten mixture of one or more selected from acylamino acids or their salts and fatty acid metal salts.

2. The powder according to claim 1, wherein the mass ratio ((A):(B)) of (A) the oil gelling agent and (B) the acyl amino acid or salt thereof is 10:90 to 80:

20.

3. The powder according to claim 1 or 2, wherein (A) the oil gelling agent contains an acylamino acid dialkylamide.

4. The powder according to any one of claims 1 to 3, further comprising (C) an oil agent.

5. The powder according to claim 4, wherein the oil (C) has polarity.

6. The powder according to any one of claims 1 to 5, having an average particle size of 1 μm to 200 μm.

7. A surface treatment agent for powder, comprising the powder according to any one of claims 1 to 6.

8. A surface treatment agent for powders comprising (A) an oil gelling agent and (B) one or more selected from acylamino acids or their salts and fatty acid metal salts.

9. The surface treatment agent according to claim 8, which is a surface treatment agent for treating powder by melting and powdering.

10. The surface treatment agent according to claim 8 or 9, further comprising at least one selected from (C) an oil, (D) a nonionic surfactant, and (E) a polyol.

11. The surface treatment agent according to claim 10, wherein the oil (C) has polarity.

12. The surface treatment agent according to claim 10, wherein the organic value of the nonionic surfactant (D) is 300 to 2,800.

13. A powder surface-treated with the surface treatment agent according to any one of claims 7 to 12.

14. A powder composition comprising the powder of claim 13.

15. A composite powder comprising a powder and the surface treatment agent according to any one of claims 7 to 12, wherein the surface treatment agent is present on the surface of the powder.

16. A powder composition comprising the composite powder of claim 15.

17. A method for producing a surface-treated powder, comprising the following step (X): Step (X): A step of mixing the powder surface treatment agent according to any one of claims 7 to 12 with the powder.

18. The method according to claim 17, wherein step (X) is carried out at a temperature of 95°C or less.

19. The method according to claim 17 or 18, wherein step (X) does not include heating using a heating device.

20. A method for surface treating a powder, comprising the following step (X): Step (X): A step of mixing a powder surface treatment agent containing (A) an oil gelling agent and (B) an acylamino acid or a salt thereof with the powder.

21. The method according to claim 20, wherein step (X) is carried out at a temperature of 95°C or less.

22. The method of claim 20 or 21, wherein step (X) does not include heating using a heating device.

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