Powder surface treatment method, surface treatment agent composition used therein, and surface-treated powder

Abstract

The present invention provides a powder surface treatment method comprising (i) a step for mixing 0.001-20 parts by mass of a surface treating agent composition with 100 parts by mass of a power, and (ii) a step for adding an acidic liquid, followed by mixing, wherein the surface treating agent composition contains (a)-(d) below: (a) one or more selected from among an N-acyl amino acid having a carbon chain length of C8-C22 and a salt thereof; (b) one or more selected from among monohydric and polyhydric alcohols; (c) water; and (d) one or more selected from among (d1) an amino acid having an isoelectric point of 7.5-11, and (d2) a compound which generates an ion selected from among an aluminum ion, a magnesium ion, a calcium ion, a zinc ion, a zirconia ion, and a titanium ion, in the surface treating agent composition.

Description

[Technical Field]

[0001] The present invention relates to a method for surface-treating powder, a surface-treating agent composition used therein, and a surface-treated powder. The present invention also relates to a cosmetic containing the surface-treated powder. [Background technology]

[0002] Powders used in cosmetics are subjected to various surface treatments to improve usability (smoothness when applied to the skin, spreadability, moist feeling, non-greasy feeling, adhesion, etc.), cosmetic effect (coverage, soft focus, light absorption / dispersion, color development, etc.), cosmetic durability (prevention of makeup dulling and discoloration caused by the powder becoming wet with sweat or sebum, adhesion, resistance to removal and creasing, etc.), formulation stability (dispersibility, emulsion stability), and moldability. Since the desired effects vary depending on the application, numerous surface treatment agents have been proposed to date.

[0003] One example is the long-standing attempt to treat the surface of powders with N-acylamino acids. A surface treatment method using aluminum, magnesium, calcium, zinc, zirconia, or titanium salts of N-acylamino acids has been disclosed (Japanese Patent Publication No. 58-72512). Simply mixing N-acylamino acids with powders is not sufficient to maintain their surface adhesion after incorporation into cosmetics containing water or oil. Patent Document 1 describes orienting and adsorbing N-acylamino acids in water or an aqueous solvent using metal ions with a positive charge of two or more to bond negatively charged hydroxyl groups on the powder surface with negatively charged carboxyl groups on the N-acylamino acids. This method requires the steps of filtration, washing, drying, and grinding, resulting in limited commercial merit. Furthermore, the drying and grinding steps can lead to the powders being prone to aggregation, resulting in insufficient oil dispersibility. It also places a significant burden on the environment.

[0004] On the other hand, a modification method (JP 2014-19783 A) is also known in which plasma is applied to the powder before surface treatment, and acylamino acids are directly reacted with the powder surface. This method requires special equipment, such as electrodes, to generate plasma. Summary of the Invention

[0005] The present invention aims to provide a simple method for surface treating powder that can be carried out with few steps and does not require special equipment, and also aims to provide powders with improved performance, particularly powders with excellent oil dispersibility, compared to conventional products, by using the treatment method.

[0006] 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 specific amounts of alcohol, water, and an amino acid or specific ion having an isoelectric point of 7.5 to 11, and have completed the present invention based on this finding. [1] (i) mixing 0.001 to 20 parts by mass of a surface treatment agent composition with 100 parts by mass of powder; and (ii) Adding an acidic solution and mixing A method for surface treatment of powder, comprising: The surface treatment agent composition comprises the following (a) to (d): (a) one or more N-acylamino acids having a carbon chain length of C8 to C22 and salts thereof (b) one or more selected from monohydric and polyhydric alcohols (c) water (d) One or more selected from the following (d1) and (d2): (d1) Amino acids with an isoelectric point of 7.5 to 11 (d2) A compound that generates ions selected from aluminum ions, magnesium ions, calcium ions, zinc ions, zirconia ions, and titanium ions in the surface treatment agent composition. A method comprising: [2] The method according to [1], wherein in step (i), the surface treatment agent composition is mixed by dropwise mixing or spray mixing. [3] The method according to [1] or [2], wherein in step (i), the amount of the surface treatment agent composition mixed is 0.1 to 20 parts by mass per 100 parts by mass of the powder. [4] The method according to any one of [1] to [3], wherein in steps (i) and (ii), the mixing is carried out using a mixer selected from the group consisting of a high-speed stirring mixer, a container rotation mixer, a container rotation mixer equipped with a stirrer, a mechanical stirring mixer, an airflow stirring mixer, and a compression-shear-impact mixer. [5] The method according to any one of [1] to [4], wherein the acidic solution is an aqueous citric acid solution or sulfuric acid. [6] The method according to any one of [1] to [5], wherein in step (ii), the acidic liquid is mixed in an amount of 0.01 to 15 parts by mass per 100 parts by mass of the powder. [7] The method according to any one of [1] to [6], wherein the powder is at least one selected from the group consisting of resin powder, silicon-containing powder, metal oxide, carbon-containing powder, fluorine-containing powder, metal salt, boron-containing powder, crystalline composite powder, and amorphous powder. [8] The method according to any one of claims 1 to 7, which does not include a drying step using power and equipment. [9] (a) to (d) below (a) one or more N-acylamino acids having a carbon chain length of C8 to C22 and salts thereof (b) one or more selected from monohydric and polyhydric alcohols (c) water (d) One or more selected from the following (d1) and (d2): (d1) Amino acids with an isoelectric point of 7.5 to 11 (d2) A compound that generates ions selected from aluminum ions, magnesium ions, calcium ions, zinc ions, zirconia ions, and titanium ions in the surface treatment agent composition. A surface treatment composition comprising:

[10] The surface treatment agent composition according to [9], which has a transmittance of 80% or more at a wavelength of 660 nm.

[11] The surface treatment agent composition according to [9] or

[10] , wherein the concentration of (a) in the surface treatment agent composition is 4 to 25 mass %.

[12] The surface treatment agent composition according to any one of [9] to

[11] , wherein the concentration of (b) in the surface treatment agent composition is 3 to 80 mass %.

[13] The surface treatment agent composition according to any one of [9] to

[12] , wherein the concentration of (c) in the surface treatment agent composition is 3 to 80 mass %.

[14] The surface treatment agent composition according to any one of [9] to

[13] , wherein the concentration of (d) in the surface treatment agent composition is 0.5 to 15 mass %.

[15] The surface treatment agent composition according to any one of [9] to

[14] , wherein the solid content concentration in the surface treatment agent composition is 10 to 23 mass %.

[16] The surface treatment agent composition according to any one of [9] to

[15] , wherein (a) in the surface treatment agent composition comprises one or more selected from myristoyl glutamic acid, sodium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and sodium oleoyl glutamate.

[17] The surface treatment agent composition according to any one of [9] to

[16] , wherein (b) in the surface treatment agent composition includes one or more selected from ethanol, 2-propanol, glycerin, pentanediol, dipropylene glycol, 1,3-butylene glycol, and pentylene glycol.

[18] The surface treatment agent composition according to any one of [9] to

[17] , wherein (d) in the surface treatment agent composition contains one or more amino acids selected from histidine, lysine, and arginine.

[19] The surface treatment agent composition according to any one of [9] to

[18] , further comprising one or more selected from sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and sodium hydrogencarbonate.

[20] The surface treatment agent composition according to any one of [9] to

[19] , further comprising one or more selected from fatty acids having a carbon chain length of C8 to C22 and salts thereof. [twenty one] A powder treated by the method according to any one of [1] to [8]. [twenty two] (a) one or more N-acylamino acids having a carbon chain length of C8 to C22 and salts thereof; and (d1) One or more amino acids selected from amino acids having an isoelectric point of 7.5 to 11 A cosmetic powder having the above on its surface. [twenty three] 23. The cosmetic powder according to claim 22, further comprising (b) one or more alcohols selected from monohydric and polyhydric alcohols on the surface thereof. [twenty four] A cosmetic composition containing the powder according to any one of

[21] to

[23] .

[0007] The powder obtained by the method of the present invention has particularly excellent oil dispersibility, a moist feel, and is easily dispersed in oily formulations, and has the effect of not running off due to sebum or sweat. DETAILED DESCRIPTION OF THE INVENTION

[0008] The method for surface treatment of powder of the present invention comprises the following steps: (i) mixing 0.001 to 20 parts by mass of a surface treatment agent composition with 100 parts by mass of powder; and (ii) A step of adding an acidic liquid to the powder mixed in step (i) and mixing the mixture. Here, the surface treatment agent composition contains the following components (a) to (d): (a) one or more N-acylamino acids having a carbon chain length of C8 to C22 and salts thereof (b) one or more selected from monohydric and polyhydric alcohols (c) water (d) One or more selected from the following (d1) and (d2): (d1) Amino acids with an isoelectric point of 7.5 to 11 (d2) A compound that generates ions selected from the group consisting of aluminum ions, magnesium ions, calcium ions, zinc ions, zirconia ions, and titanium ions in the surface treatment agent composition.

[0009] Regarding component (a) contained in the surface treatment agent composition of the present invention, the amino acid component constituting the N-acylamino acid having 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. 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, with glycine, β-alanine, α-alanine, threonine, glutamic acid, and aspartic acid being even more 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 mono-N-acyl derivatives. The acyl component constituting the N-acyl group of N-acylamino acids having a carbon chain length of C8 to C22 includes 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 groups, natural 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.). N-acyl amino acids having a carbon chain length of C8 to C20 are preferred, and N-acyl amino acids having a carbon chain length of C14 to C18 are more preferred. Myristoyl group, palmitoyl group, stearoyl group, behenoyl group, palmitoleyl group, oleoyl group, and linoleoyl group are preferred, myristoyl group, palmitoyl group, and stearoyl group are more preferred, and palmitoyl group and stearoyl group are even more preferred. Salts of N-acylamino 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 and magnesium salts; ammonium salts; basic organic salts, and triethanolamine salts. Among 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 having a carbon chain length of C8 to C22 or their salts include myristoyl glutamic acid, sodium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, sodium oleoyl glutamate, etc., and preferred are myristoyl glutamic acid, sodium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and sodium oleoyl glutamate. The use of these N-acyl amino acids can improve the oil dispersibility of the treated powder. The concentration of component (a) in the surface treatment agent composition is preferably 4 to 25 mass %, more preferably 7 to 20 mass %. By adjusting the concentration of component (a) in the surface treatment agent composition to such a concentration, the oil dispersibility of the treated powder can be improved even when a small amount of the surface treatment agent composition is used.

[0010] Examples of the monohydric or polyhydric alcohol that is component (b) contained in the surface treatment agent composition of the present invention include ethanol, 2-propanol, 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, polyglycerol, sorbitol, maltodextrin ... Examples of the alcohol include glycerin, sucrose, trehalose, lactose, and maltotriose, and preferably ethanol, 2-propanol, 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, and 1,3-butylene glycol, and even more preferably glycerin. The use of a monohydric or polyhydric alcohol can further increase the solubility of component (a) in the surface treatment agent composition, making it possible to use a small amount of the surface treatment agent composition. The concentration of component (b) in the surface treatment agent composition is preferably 3 to 80 mass%, more preferably 5 to 75 mass%, or 10 to 70 mass%, and even more preferably 16 to 67 mass%. By adjusting the concentration of component (b) in the surface treatment agent composition to such a concentration, the oil dispersibility of the treated powder can be improved. The concentration of component (c) in the surface treatment agent composition is preferably 3 to 80 mass%, more preferably 5 to 75 mass%, or 10 to 70 mass%, and even more preferably 12 to 67 mass%. By adjusting the concentration of component (c) in the surface treatment agent composition to such a concentration, the oil dispersibility of the treated powder can be improved.

[0011] Examples of the amino acid having an isoelectric point of 7.5 to 11, which is component (d1) contained in the surface treatment agent composition of the present invention, include histidine (isoelectric point: 7.59), lysine (isoelectric point: 9.75), and arginine (isoelectric point: 10.76). The compound as component (d2) contained in the surface treatment agent composition of the present invention is not particularly limited as long as it can generate ions selected from the group consisting of aluminum ions, magnesium ions, calcium ions, zinc ions, zirconia ions, and titanium ions. Examples of such compounds include aluminum hydroxide, aluminum sulfate, aluminum chloride, aluminum nitrate, sodium aluminate, aluminum potassium sulfate, magnesium hydroxide, magnesium chloride, magnesium sulfate, magnesium nitrate, magnesium potassium sulfate, calcium hydroxide, calcium chloride, calcium nitrate, calcium acetate, zinc chloride, zinc nitrate, zinc sulfate, zinc acetate, zirconium sulfate, zirconium chloride, titanium oxysulfate, and titanium tetrachloride. The component (d) contained in the surface treatment agent composition of the present invention preferably contains one or more amino acids selected from histidine, lysine, and arginine. The use of these amino acids can improve the oil dispersibility of the treated powder. The concentration of component (d) in the surface treatment agent composition is preferably 0.5 to 15 mass%, more preferably 0.7 to 10 mass%, or 1.0 to 8 mass%, and even more preferably 1.5 to 7 mass%. By adjusting the concentration of component (d) in the surface treatment agent composition to such a concentration, the oil dispersibility of the treated powder can be improved.

[0012] The surface treatment agent composition of the present invention may further contain one or more selected from sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and sodium bicarbonate. By containing these, hydroxyl groups on the surface of the powder to be treated are dissociated, allowing for efficient treatment. The concentration of these in the surface treatment agent composition is preferably 0.1 to 3 mass%, more preferably 1 to 2.5 mass%. The surface treatment agent composition of the present invention may further contain one or more fatty acids selected from fatty acids having a carbon chain length of C8 to C22 and their salts. The inclusion of one or more fatty acids selected from fatty acids having a carbon chain length of C8 to C22 and their salts can improve the oil dispersibility of the treated powder. 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, hydrogenated beef tallow fatty acid, coconut oil fatty acid, and palm oil fatty acid. Fatty acids having a carbon chain length of C8 to C20 are preferred, and fatty acids having a carbon chain length of C14 to C18 are more preferred. Furthermore, examples of 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 and magnesium salts; ammonium salts; basic organic salts; triethanolamine salts, etc. The concentration of fatty acids having a carbon chain length of C8 to C22 and salts thereof in the surface treatment agent composition is preferably 0.1 to 15% by mass, and more preferably 0.5 to 2.5% by mass. The surface treatment agent composition of the present invention preferably has a transmittance at a wavelength of 660 nm of 60% or more, more preferably 80% or more. By setting the transmittance of the surface treatment agent composition within this range, the oil dispersibility of the treated powder can be made better. The solids concentration in the surface treatment agent composition is preferably 10 to 23 mass%, more preferably 12 to 22 mass%, and even more preferably 14 to 20 mass%. By setting the solids concentration in the surface treatment agent composition within this range, the surface treatment agent can be applied to the treated powder at high density, and the oil dispersibility of the treated powder can be improved.

[0013] In step (i), the surface treatment composition is mixed in an amount of 0.001 to 20 parts by mass, preferably 0.01 to 20 parts by mass or 0.1 to 18 parts by mass, more preferably 1 to 15% by mass or 3 to 15% by mass, and even more preferably 7 to 16 parts by mass, relative to 100 parts by mass of the powder. By using the surface treatment composition in such an amount, steps such as washing, filtering, and drying the treated powder can be omitted. 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; Silicate (Al / Ca / Na silicate, Na / Mg silicate), sericite, mica, talc, kaolin, bentonite, aluminum silicate, magnesium silicate, cubic sodium aluminosilicate, silicon carbide, silicon oxides such as hydrous silica and anhydrous silica (foliate silica, nonporous silica, porous silica, semiporous silica, etc.); silicon-containing powders such as silicates (Al / Ca / Na silica, Na / Mg silica), sericite, mica, talc, kaolin, bentonite, aluminum silica, magnesium silica, cubic sodium aluminosilicate, silicon carbide, hydrous silica, and anhydrous silica (foliate silica, nonporous silica, porous silica, semiporous silica, etc.); Metallic fatty acid soaps such as magnesium stearate, magnesium myristate, and zinc stearate, cellulose, cellulose particles, starch, corn starch, rice starch, potato starch, wheat flour, wood powder, carbon black, graphite, ultramarine, Prussian blue, carmine, and other carbon-containing powders; Metal salts such as barium sulfate, plate barium sulfate, butterfly barium sulfate, calcium carbonate, magnesium carbonate; Fluorine-containing powders such as synthetic phlogopite (synthetic mica) and synthetic iron phlogopite; Boron-containing powders such as boron nitride; Pearl powder, colored pearl pigment, titanium dioxide and other composite powders; Examples include waxes, pigments, lakes, etc. Furthermore, the powder may be surface-treated with silicone, fluorine compound, silane coupling agent, silane, organic titanate, fatty acid, metal soap, oil, amino acid, or the like. 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. The powder may preferably be, for example, talc, mica, sericite, titanium oxide, red iron oxide, yellow iron oxide, or black iron oxide.

[0014] In step (ii), the acidic solution is mixed in an amount of preferably 0.01 to 15 parts by mass, more preferably 0.1 to 10 parts by mass, per 100 parts by mass of the powder. By using the acidic solution in such an amount, the oil dispersibility of the treated powder can be improved. Examples of acidic solutions used in the surface treatment method of the present invention include aqueous citric acid solutions, tartaric acid solutions, lactic acid, malic acid solutions, succinic acid solutions, ascorbic acid solutions, acetic acid, sulfuric acid, hydrochloric acid, phosphoric acid, and boric acid, with citric acid solutions and sulfuric acid being preferred. The use of these acidic solutions makes it difficult for the surface treatment agent to separate from the powder surface, and the treated powder has a pH close to that of human skin when wetted with water, making it less irritating to the skin.

[0015] The mixing in steps (i) and (ii) may be carried out using a mixer selected from high-speed agitation mixers such as a Henschel mixer, FM mixer, high-shear mixer, vertical mixer, or planetary mixer; container rotation mixers or container rotation mixers with agitator such as a W-type mixer, CV-type mixer, V-type mixer, rocking mixer, container mixer, Bohle mixer, or container mixer with a 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 type compression / shear / impact mixer. From the viewpoint of scale-up, the surface treatment agent composition and / or the acidic liquid may be mixed by dropwise addition or spray mixing. From the viewpoint of handling the treated powder, the surface treatment method of the present invention preferably does not include a drying step that requires power and equipment.

[0016] Powders treated by the surface treatment method of the present invention have particularly excellent oil dispersibility, a moist feel, and are easily dispersed in oily formulations, and are effective in preventing the pigment from washing away due to sebum or sweat. Furthermore, by using powders treated by the surface treatment method of the present invention in cosmetic compositions, the color development of the pigment becomes better (the color of the pigment becomes more vivid).

[0017] The cosmetic powder of the present invention also has on its surface (a) one or more N-acylamino acids and their salts having a carbon chain length of C8 to C22, and (d1) one or more amino acids having an isoelectric point of 7.5 to 11. Here, "on the surface" includes not only simple adsorption but also bonding of component (a) via component (d1). For example, it includes bonding of a negatively charged portion of the surface of titanium oxide as the powder to be treated, which is formed by dissociating a hydroxyl group, with a negatively charged portion of dissociating a carboxyl group of disodium N-stearoyl glutamate as component (a), which is formed by ionic bonding via a positively charged portion of dissociating an amino group of L-arginine as component (d1). The cosmetic powder of the present invention may also have on its surface (b) one or more monohydric and polyhydric alcohols. The monohydric and polyhydric alcohols are preferably ethanol, 2-propanol, 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, and 1,3-butylene glycol, and even more preferably glycerin.

[0018] Cosmetic compositions containing powders treated by the surface treatment method of the present invention can be formulated into any form of cosmetic that can be applied to desired areas (e.g., skin, hair, scalp, lips, eyes, eyelashes, eyelids, nails) in accordance with 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.

[0019] Next, the present invention will be described with reference to examples and comparative examples, but the present invention is not limited to these. [Example]

[0020] Example 1 A surface treatment composition was obtained by dissolving 0.6 g of disodium N-stearoyl glutamate and 0.1 g of L-arginine hydrochloride in a mixed solution of 1.2 g of glycerin and 1.2 g of water. This surface treatment composition was added to 20 g of titanium dioxide (Ishihara Sangyo Kaisha, CR-50) and mixed three times for 20 seconds using a mill and mixer (Tescom, TML161). 0.56 g of 50% (w / v) citric acid solution was then added and mixed three times for 20 seconds. This titanium dioxide surface-treated with disodium N-stearoyl glutamate was obtained without washing, filtering, or drying.

[0021] <Comparative Example 1> Method (wet method) described in JP-A-58-72512 (Patent Document 1): In a 200 mL beaker, 0.6 g of disodium N-stearoyl glutamate was dissolved in 43.9 g of water at 60 °C, and 20 g of titanium dioxide (Ishihara Sangyo Kaisha, CR-50) was dispersed. 0.1 g of sodium aluminate was added and dissolved. After stirring for 30 minutes, 64% sulfuric acid was added until the pH reached 6. The resulting slurry was centrifuged in a centrifuge (Hitachi Koki, CR22GIII) at 5000 rpm for 5 minutes, and the supernatant was removed. The slurry was then redispersed by adding an equal volume of water. This centrifugal purification process was repeated four times. After removing the supernatant, the mixture was dried in a thermostatic chamber at 70 °C for 48 hours and then ground three times for 20 seconds in a mill and mixer (Tescom, TML161) to obtain titanium dioxide surface-treated with disodium N-stearoyl glutamate.

[0022] <Comparative Example 2> Simple mixing (dry method) 20 g of titanium oxide (Ishihara Sangyo Kaisha, CR-50), 0.6 g of disodium N-stearoyl glutamate (powder), and 0.1 g of L-arginine hydrochloride were mixed three times for 20 seconds in a mill and mixer (Tescom, TML161) to obtain titanium oxide surface-treated with disodium N-stearoyl glutamate.

[0023] <Evaluation> Oil dispersibility evaluation of powder: Based on JIS K 5101-13-1:2004 Pigment Test Methods - Part 13: Oil Absorption - Section 1: Refined Linseed Oil Method, 1g of the powder to be evaluated was placed on a glass plate, silicone oil (Shin-Etsu Chemical, SH245) was added, and the mixture was kneaded with a paint knife. The amount of oil when the mixture formed a single mass was the oil absorption point. Further addition and kneading were continued, and the amount of oil that flowed out of the oil-absorbed powder was recorded as the pour point. The difference between the pour point and the oil absorption point was used as an index of dispersibility. The index after surface treatment was given 5 points if it was less than 30% of the index of the powder before surface treatment, 3 points if it was 30% or more but less than 50%, 2 points if it was 50% or more but less than 70%, 1 point if it was 71% or more, and 0 point if it was 100 points or more. Instead of silicone oil, scores were similarly calculated for hydrocarbons (Moresco, Liquid Paraffin P-55), triglycerides (Koyu Alcohol Kogyo, TCG-M), and ester oils (Koyu Alcohol Kogyo, CEH). The total score for the four oils was rated as A for 16 to 20 points, B for 12 to 15 points, C for 8 to 11 points, D for 4 to 7 points, and E for 3 points or less.

[0024] The oil dispersibility of Example 1 and Comparative Examples 1 and 2 was evaluated, with Example 1 receiving an A, Comparative Example 1 receiving a D, and Comparative Example 2 receiving an E. To fix acylamino acids to the powder surface, they must be oriented and adsorbed, and simple mixing (Comparative Example 2) is insufficient to achieve surface fixation. On the other hand, the wet method (Comparative Example 1) described in JP-A-58-72512 (Patent Document 1) is effective for achieving oriented adsorption, but requires steps such as washing and drying, which are cost-inefficient, and the surface fixation rate is low, resulting in inferior oil dispersibility compared to the method of the present invention (Example 1).

[0025] The type of alcohol (b) in the surface treatment composition was investigated. To confirm the dissolution state of the acylamino acid in the surface treatment composition, the absorbance of the surface treatment composition was measured at a wavelength of 660 nm using a grating microplate reader (Corona Electric, SH-1000) on a 96-well plate, and the converted transmittance was measured. In addition, the oil dispersibility of the powder treated with the surface treatment composition was evaluated as described above.

[0026] <Example 2> A surface treatment composition was obtained by dissolving 0.4 g of disodium N-stearoyl glutamate and 0.1 g of L-arginine hydrochloride in 1.2 g of ethanol and 1.2 g of water. This surface treatment composition was added to 20 g of titanium dioxide (Ishihara Sangyo Kaisha, CR-50) and mixed three times for 20 seconds using a mill and mixer (Tescom, TML161). Then, 0.56 g of 50% (w / v) citric acid solution was added and mixed three times for 20 seconds. Titanium dioxide surface-treated with disodium N-stearoyl glutamate was obtained without washing, filtration, or drying. The results are shown in Table 1. <Examples 3 to 7> Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 2, except that the 1.2 g of ethanol in Example 2 was changed to an alcohol shown in Table 1. The results are shown in Table 1.

[0027] [Table 1]

[0028] Examination of the types of amino acids (d1) in the surface treatment composition Example 8 Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 0.1 g of L-arginine hydrochloride was changed to 0.1 g of L-histidine. The results are shown in Table 2. Example 9 Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 0.1 g of L-arginine hydrochloride was changed to 0.1 g of L-lysine. The results are shown in Table 2. <Comparative Example 3> Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 0.1 g of L-arginine hydrochloride was changed to 0.1 g of L-aspartic acid. The results are shown in Table 2. <Comparative Example 4> Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 0.1 g of L-arginine hydrochloride was changed to 0.1 g of L-glutamic acid. The results are shown in Table 2.

[0029] [Table 2]

[0030] Examination of various blending amounts of surface treatment agent composition <Examples 10 to 22, Comparative Example 5> Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that the blending amounts of the various components in Example 7 were changed as shown in Table 3. The results are shown in Table 3. In Comparative Example 5, the amount of the surface treatment composition was too large relative to the powder, resulting in a paste-like state, and therefore the oil dispersibility was not evaluated.

[0031] [Table 3]

[0032] (d) Comparison of ingredients <Examples 23 to 25> Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 15, except that 0.1 g of L-arginine hydrochloride in Example 15 was replaced with each of the components (d2). The results are shown in Table 4.

[0033] [Table 4]

[0034] Consideration of the type of powder to be treated <Examples 26 to 32> Powders surface-treated with disodium N-stearoyl glutamate were obtained in the same manner as in Example 7, except that the 20 g of titanium oxide (Ishihara Sangyo Kaisha, CR-50) in Example 7 was changed to the powder shown in Table 5. The results of the oil dispersibility evaluation of the surface-treated powders are shown in Table 5. Details of the powders used are as follows: Talc: Asada Flour Mill, JA-46R Mica: Yamaguchi Mica, Y-2300X Sericite: Sanshin Mining, FSE Fine particle titanium dioxide: Ishihara Sangyo, TTO-55 Red iron oxide: Titanium Industries, R-516HP Yellow iron oxide: Titanium Industries, LL-100HP Black iron oxide: Titanium Industries, BL-100HP

[0035] [Table 5]

[0036] Consideration of the type and amount of acid Example 33 Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that the amount of 50% citric acid was changed from 0.56 g to 2 g. The oil dispersibility of the surface-treated powder was evaluated, and the results are shown in Table 6. Example 34 Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 0.56 g of 50% citric acid was changed to 0.01 g of 64% sulfuric acid. The oil dispersibility of the surface-treated powder was evaluated, and the results are shown in Table 6. Example 35 Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that the amount of 50% citric acid was changed from 0.56 g to 3.2 g. The oil dispersibility of the surface-treated powder was evaluated, and the results are shown in Table 6. Example 36 Titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 0.56 g of 50% citric acid was changed to 0.001 g of 64% sulfuric acid. The oil dispersibility of the surface-treated powder was evaluated, and the results are shown in Table 6.

[0037] [Table 6]

[0038] <Examples 37 to 47> The amounts of the various components in Example 7 were changed as shown in Table 7, and titanium oxide surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7. The results are shown in Table 7.

[0039] [Table 7]

[0040] <Example 48> A surface treatment agent composition was obtained by dissolving 20 g of disodium N-stearoyl glutamate and 5 g of L-arginine hydrochloride in 60 g of glycerin and 60 g of water. 1000 g of titanium dioxide (Ishihara Sangyo Kaisha, CR-50) was placed in an FM mixer (Nippon Coke, FM5C / I type) and stirred at a blade speed of 1500 rpm. The surface treatment agent composition was added and mixed for 60 seconds, and then 28 g of 50% (w / v) aqueous citric acid solution was added and mixed for another 60 seconds. Without washing, filtration, or drying, titanium dioxide surface-treated with disodium N-stearoyl glutamate was obtained. Furthermore, 1000 g of titanium oxide was replaced with 1000 g of ultrafine titanium oxide (Ishihara Sangyo Kaisha, TTO-55(N)), 1000 g of fine zinc oxide (Teikan, MZ-300), 1000 g of red iron oxide (Titanium Industry, R-516HP), 1000 g of yellow iron oxide (Titanium Industry, LL-100HP), 1000 g of black iron oxide (Titanium Industry, BL-100HP), 1000 g of talc (Asada Flour Milling, JA-46R), 1000 g of mica (Yamaguchi Mica, Y-2300X), and 1000 g of sericite (Sanshin Mining, FSE). Surface-treated ultrafine titanium oxide, fine zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, talc, mica, and sericite were obtained in the same manner. The results are shown in Tables 7 and 8. <Example 49> Surface-treated titanium oxide, ultrafine titanium oxide, fine zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, talc, mica, and sericite were obtained in the same manner as in Example 48, except that 20 g of disodium N-stearoyl glutamate was replaced with 12.35 g of disodium N-stearoyl glutamate, 6.65 g of sodium N-palmitoyl glutamate, 0.65 g of sodium stearate, and 0.35 g of sodium palmitate. The results are shown in Tables 7 and 8. Example 50 Surface-treated titanium oxide, ultrafine titanium oxide, fine zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, talc, mica, and sericite were obtained in the same manner as in Example 48, except that 20 g of disodium N-stearoyl glutamate was replaced with 10.66 g of disodium N-stearoyl glutamate, 5.74 g of sodium N-palmitoyl glutamate, 2.34 g of sodium stearate, and 1.26 g of sodium palmitate. The results are shown in Tables 7 and 8. <Comparative Example 6> The 20 g of titanium oxide used in Comparative Example 1 was replaced with 20 g of ultrafine titanium oxide (Ishihara Sangyo Kaisha, TTO-55(N)), 20 g of fine zinc oxide (Teikan, MZ-300), 20 g of red iron oxide (Titanium Kogyo, R-516HP), 20 g of yellow iron oxide (Titanium Kogyo, LL-100HP), 20 g of black iron oxide (Titanium Kogyo, BL-100HP), 20 g of talc (Asada Flour Milling, JA-46R), 20 g of mica (Yamaguchi Mica, Y-2300X), and 20 g of sericite (Sanshin Mining, FSE), and the same procedure was repeated to obtain surface-treated ultrafine titanium oxide, fine zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, talc, mica, and sericite, respectively. The results are shown in Table 8.

[0041] [Table 8]

[0042] <Examples 101 to 103, Comparative Examples 101 and 102> A liquid foundation was prepared using the components shown in Table 9 as follows. Component B was dispersed in a homomixer (Primix, MARK II 2.5 type) at 6000 rpm for 5 minutes. Component C was added and dispersed at 4000 rpm for 5 minutes. While stirring at 3000 rpm, component A, which had been completely dissolved, was gradually added and emulsified to obtain a liquid foundation.

[0043] [Table 9]

[0044] <Test Example 1> Hiding power rating of powder dispersion: In accordance with the method using the test plate of JIS K 5600-4-1:1999, the average value of three measurements was taken as the hiding power using a fund-type cryptometer (manufactured by Coating Tester Co., Ltd.). When evaluating the hiding power of the examples and comparative examples, the results shown in Table 10 were obtained. It was confirmed that the hiding power of Examples 101 to 103 was high, and that the surface-treated powders of Examples 101 to 103 had high dispersibility in oil and that a liquid foundation with covering power could be prepared.

[0045]

Table 10

[0046] <Test Example 2> Sensory evaluation: For the liquid foundations of Examples 101 to 103 and Comparative Example 102, (1) smoothness during application (absence of roughness), (2) elongation during application, (3) moist feeling after application, (3) absence of creaking after application, and (5) adhesion to the skin were evaluated by sensory evaluation by five professional panelists. The evaluation was carried out by applying each powder to the inner part of the forearm of the panelist and comparing it with the liquid foundation of Comparative Example 101 as a comparison target, and evaluating it based on the following evaluation criteria. For each evaluation item, the average value M of the evaluation scores of five people was calculated. When 0.5 < M ≤ 2.0, it was designated as "A", when 0 < M ≤ 0.5, it was designated as "B", when -0.5 < M ≤ 0, it was designated as "C", and when -2.0 ≤ M ≤ -0.5, it was designated as "D", as shown in Table 13.

[0047] <Evaluation criteria> (1) Smoothness during application (absence of roughness) 2 points: There is a comfortable smoothness compared to the comparison target. 1 point: There is a slightly comfortable smoothness compared to the comparison target. 0 point: There is an equivalent degree of smoothness compared to the comparison target. -1 point: There is a slightly rough feeling compared to the comparison target. -2 points: There is a rough feeling compared to the comparison target. (2) Elongation during application 2 points: There is a comfortable elongation compared to the comparison target. 1 point: Compared to the comparison object, there is a slightly comfortable stretch. 0 points: There is a similar level of growth compared to the comparison target -1 point: Compared to the comparison item, there is a slight feeling of catching. -2 points: Compared to the comparison item, there is a sense of clunkiness. (3) Moisturizing feeling after application 2 points: Compared to the comparison product, it has a pleasant moist feeling. 1 point: Compared to the comparison product, it has a slightly more pleasant moist feeling. 0 points: Has the same level of moistness as the comparison product -1 point: Slightly dry compared to the comparison item -2 points: It feels dry compared to the comparison item (4) No creaking after application 2 points: Compared to the comparison item, the pleasant, smooth feeling continues 1 point: Compared to the comparison object, a somewhat pleasant, smooth feeling continues 0 points: The same level of smoothness continues compared to the comparison object -1 point: Slightly creakier than the comparison item -2 points: There is a creaking feeling compared to the comparison item. (5) Adhesion to the skin 2 points: Very good adhesion compared to the comparison object 1 point: Slightly stronger adhesion than the comparison item 0 points: The adhesiveness is the same as that of the comparison object. -1 point: Compared to the comparison product, it does not adhere well to the skin. -2 points: Poor adhesion to the skin compared to the comparison product

[0048] [Table 11]

[0049] <Examples 104 to 106, Comparative Examples 103 and 104> A press foundation was prepared as follows using the components shown in Table 12. B was heated and dissolved. A was weighed and pulverized with a laboratory mixer. B was added to A and further mixed with the laboratory mixer for 5 minutes. It was passed through a sieve with a mesh size of 150 μm and compression molded in a mold.

[0050]

Table 12

[0051] <Test Example 3> Sensory evaluation: Regarding the press foundations of Examples 104 to 106 and Comparative Example 104, (1) smoothness during application (absence of roughness), (2) elongation during application, (3) moist feeling after application, (3) absence of squeak after application, and (5) adhesion to the skin were evaluated by sensory evaluation by 5 professional panelists. The evaluation was carried out by applying each powder to the inner part of the forearm of the panelist and evaluating it based on the following evaluation criteria with the press foundation of Comparative Example 103 as a comparison target. For each evaluation item, the average value M of the evaluation scores of 5 panelists was calculated. When 0.5 < M ≤ 2.0, it was rated as "A", when 0 < M ≤ 0.5, it was rated as "B", when -0.5 < M ≤ 0, it was rated as "C", and when -2.0 ≤ M ≤ -0.5, it was rated as "D", as shown in Table 13.

[0052] <Evaluation criteria> (1) Smoothness during application (absence of roughness) 2 points: There is a comfortable smoothness compared to the comparison target. 1 point: There is a slightly comfortable smoothness compared to the comparison target. 0 point: There is a similar smoothness compared to the comparison target. -1 point: There is a slightly roughness compared to the comparison target. -2 points: There is roughness compared to the comparison target. (2) Elongation during application 2 points: There is a comfortable elongation compared to the comparison target. 1 point: There is a slightly comfortable elongation compared to the comparison target. 0 points: There is a similar level of growth compared to the comparison target -1 point: Compared to the comparison item, there is a slight feeling of catching. -2 points: Compared to the comparison item, there is a sense of clunkiness. (3) Moisturizing feeling after application 2 points: Compared to the comparison product, it has a pleasant moist feeling. 1 point: Compared to the comparison product, it has a slightly more pleasant moist feeling. 0 points: Has the same level of moistness as the comparison product -1 point: Slightly dry compared to the comparison item -2 points: It feels dry compared to the comparison item (4) No creaking after application 2 points: Compared to the comparison item, the pleasant, smooth feeling continues 1 point: Compared to the comparison object, a somewhat pleasant, smooth feeling continues 0 points: The same level of smoothness continues compared to the comparison object -1 point: Slightly creakier than the comparison item -2 points: There is a creaking feeling compared to the comparison item. (5) Adhesion to the skin 2 points: Very good adhesion compared to the comparison object 1 point: Slightly stronger adhesion than the comparison item 0 points: The adhesiveness is the same as that of the comparison object. -1 point: Compared to the comparison product, it does not adhere well to the skin. -2 points: Poor adhesion to the skin compared to the comparison product

[0053] [Table 13]

[0054] <Example 107, Comparative Example 105> A lip cosmetic was prepared using the ingredients shown in Table 14 as follows. A was heated and dissolved at 105°C. B was added and heated and dissolved at 90°C. C was then added and heated and mixed at 90°C. D, which had been dispersed beforehand using a three-roller, was then added. E was added and heated and mixed at 90°C, followed by degassing. The mixture was filled into a mold at a filling temperature of 90°C, rapidly cooled to -5°C, returned to room temperature, and loaded into a product container. The lip cosmetic of Example 107 had better color development, less color unevenness, and better color uniformity than Comparative Example 105. Furthermore, it was free from sweating or blooming, and had good storage stability.

[0055] [Table 14]

[0056] <Example 108> An eye shadow was prepared using the components shown in Table 15 as follows: Component A was mixed thoroughly in a blender, and then component B, which had been uniformly dissolved in advance, was added and mixed. The mixture was sieved through a 150 μm mesh sieve and compression molded in a press. The eye shadow of Example 108 did not lose the luster of the pearl pigment raw material itself even after press molding, and maintained its luster during use.Furthermore, it had excellent color development.

[0057] [Table 15]

[0058] Example 109 A pencil composition was prepared using the ingredients shown in Table 16 as follows. Component A was mixed for 5 minutes at 1000 rpm in an FM mixer (Nippon Coke, FM5C / I type). The mixed component A was added to component B, which had been melted at 95°C, and the mixture was thoroughly kneaded and then mixed in a vacuum extrusion molding machine. The mixture was formed into a lead in the extrusion molding machine and sandwiched between shaft plates to form a pencil. The pencils of the examples had hard-to-break leads, high gloss, and excellent color development.

[0059] [Table 16]

[0060] Example 110 An antiperspirant composition was prepared using the ingredients shown in Table 17 as follows: A was heated and dissolved at 95°C and then allowed to cool to 75°C. B was heated and dissolved at 70°C, A was added and mixed thoroughly. C was added and mixed, then the mixture was filled into a product container and cooled to room temperature. The antiperspirant of Example 110 was little sticky, left little white residue, spread well enough to be applied thinly and evenly, and also had good storage stability.

[0061] [Table 17]

[0062] <Example 51> Silica surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 20 g of titanium oxide in Example 7 was replaced with 20 g of silica (P-1500, JGC Catalysts and Chemicals). Similarly, cornstarch surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 20 g of titanium oxide in Example 7 was replaced with 20 g of cornstarch (Japanese Pharmacopoeia Corn Starch ST-C, Nippon Starch Chemical). Furthermore, carbon black surface-treated with disodium N-stearoyl glutamate was obtained in the same manner as in Example 7, except that 20 g of titanium oxide in Example 7 was replaced with 20 g of carbon black (MIDNIGHT BLACK, GEOTECH International BV).

[0063] <Examples 111 and 112, Comparative Example 106> A leave-on cosmetic was prepared using the ingredients listed in Table 18 as follows. Component B was thoroughly mixed. Components C and D were added in order and dissolved at 85°C. Next, component E was added and dissolved at 85°C. Components G and H, which had been mixed in advance, were added to form an aqueous phase. Separately, component A was mixed at 85°C, and the aqueous phase was added while stirring with a homomixer (Primix, MARK II 2.5 type), followed by stirring at 85°C for 3 minutes (5000 rpm). Subsequently, the mixture was cooled to 45°C while stirring at 50 rpm using a mechanical stirrer. Furthermore, component F was added while stirring at 100 rpm using a mechanical stirrer, and mixed for 1 minute. The mixture was allowed to cool to room temperature to obtain a leave-on cosmetic. Compared to Comparative Example 106, the leave-on cosmetic of Example 111 had superior smoothness upon application and skin transparency, and application further improved gloss. Furthermore, the leave-on cosmetic of Example 112 was superior to Comparative Example 106 in providing a moist feeling and a clear skin feeling after application, and application further improved the skin's luster.

[0064] [Table 18]

[0065] <Example 113> A facial cleansing powder was prepared using the ingredients shown in Table 19 as follows. All ingredients were mixed in a mixer for 1 minute. The resulting facial cleansing powder was water-compatible and foamed well, and left the skin feeling moisturized without feeling tight after washing. [Table 19]

[0066] <Example 114> A mascara was prepared using the ingredients shown in Table 20 as follows. Component A was dispersed, and once the hydroxyethyl cellulose was completely hydrated, it was heated to 80°C. Component C was weighed and heated to 80°C until all ingredients were melted. Component B was gradually added to component C, and the mixture was dispersed for 5 minutes at 6000 rpm using a homomixer (Primix, MARK II 2.5 type). The mixture was allowed to cool to room temperature, yielding a mascara. The resulting mascara had good color development, no clumping of pigment, and good application to the eyelashes.

[0067] [Table 20]

[0068] <Example 115, Comparative Example 107> A W / O emulsion sunscreen cosmetic product was prepared using the ingredients listed in Table 21 as follows. Components A and B were each heated to 70°C and dissolved. The powder components of the dissolved component A were thoroughly dispersed, and the dissolved component B was added while processing at 4000 rpm with a homomixer (Primix, MARK II 2.5 model). The emulsion was stirred to room temperature while cooling with water to obtain a W / O emulsion sunscreen cosmetic product. Compared to Comparative Example 107, the W / O emulsion sunscreen cosmetic product of Example 115 was more resistant to coming off with sweat or water, had high water resistance, had a fresh feel and less stickiness, spread easily on the skin, and provided sufficient UV protection.

[0069] [Table 21]

[0070] <Example 116, Comparative Example 108> A W / O cream sunscreen cosmetic was prepared using the ingredients listed in Table 22 as follows. Components A and B were each heated to 70°C and dissolved. The powder components of the dissolved component A were thoroughly dispersed, and the dissolved component B was added while processing at 4500 rpm with a homomixer (Primix, MARK II 2.5 model). The emulsion was stirred to room temperature while cooling with water to obtain a W / O cream sunscreen cosmetic. Compared to Comparative Example 108, the W / O cream sunscreen cosmetic of Example 116 had superior storage stability, was resistant to coming off with sweat or water, was highly water-resistant, had a moist feel, spread easily on the skin, and provided sufficient UV protection.

[0071] [Table 22]

Claims

1. (i) mixing 3 to 18 parts by mass of a surface treatment agent composition with 100 parts by mass of powder; and (ii) Adding an acidic solution and mixing A method for surface treatment of powder, comprising: The surface treatment agent composition comprises the following (a) to (d): (a) one or more N-acylamino acids having a carbon chain length of C8 to C22 and salts thereof; (b) one or more selected from monohydric and polyhydric alcohols (c) water (d) one or more selected from the following (d1) and (d2): (d1) Amino acids with an isoelectric point of 7.5 to 11 (d2) A compound that generates ions selected from aluminum ions, magnesium ions, calcium ions, and zinc ions in the surface treatment agent composition. wherein the concentration of (a) in the surface treatment agent composition is 7 to 25% by mass, the concentration of (b) in the surface treatment agent composition is 3 to 80% by mass, and the concentration of (d) in the surface treatment agent composition is 0.5 to 15% by mass.

2. The method according to claim 1, wherein in step (i), the surface treatment agent composition is drop-mixed or spray-mixed.

3. 3. The method according to claim 1 or 2, wherein in steps (i) and (ii), the mixing is carried out using a mixer selected from the group consisting of a high-speed stirring mixer, a container rotation mixer, a container rotation mixer equipped with a stirrer, a mechanical stirring mixer, an airflow stirring mixer, and a compression / shear / impact mixer.

4. The method according to any one of claims 1 to 3, wherein the acidic liquid is an aqueous citric acid solution or sulfuric acid.

5. The method according to any one of claims 1 to 4, wherein in step (ii), the acidic liquid is mixed in an amount of 0.01 to 15 parts by mass per 100 parts by mass of the powder.

6. The method according to any one of claims 1 to 5, wherein the powder is at least one selected from the group consisting of resin powder, silicon-containing powder, metal oxide, carbon-containing powder, fluorine-containing powder, metal salt, boron-containing powder, crystalline composite powder, and amorphous powder.

7. The method according to any one of claims 1 to 6, which does not include a drying step using power and equipment.

8. The following (a) to (d) (a) one or more N-acylamino acids having a carbon chain length of C8 to C22 and salts thereof; (b) one or more selected from monohydric and polyhydric alcohols (c) water (d) one or more selected from the following (d1) and (d2): (d1) Amino acids with an isoelectric point of 7.5 to 11 (d2) A compound that generates ions selected from aluminum ions, magnesium ions, calcium ions, and zinc ions in the surface treatment agent composition. Including, A surface treatment agent composition, wherein the concentration of (a) in the surface treatment agent composition is 7 to 25 mass %, the concentration of (b) in the surface treatment agent composition is 3 to 80 mass %, and the concentration of (d) in the surface treatment agent composition is 0.5 to 15 mass %.

9. The surface treatment agent composition according to claim 8, which has a transmittance of 80% or more at a wavelength of 660 nm.

10. The surface treatment agent composition according to claim 8 or 9, wherein the concentration of (c) in the surface treatment agent composition is 3 to 80 mass %.

11. The surface treatment agent composition according to any one of claims 8 to 10, wherein the solid content concentration in the surface treatment agent composition is 10 to 23 mass%.

12. The surface treatment agent composition according to any one of claims 8 to 11, wherein (a) in the surface treatment agent composition comprises one or more selected from myristoyl glutamic acid, sodium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and sodium oleoyl glutamate.

13. The surface treatment agent composition according to any one of claims 8 to 12, wherein (b) in the surface treatment agent composition comprises one or more selected from ethanol, 2-propanol, glycerin, pentanediol, dipropylene glycol, 1,3-butylene glycol, and pentylene glycol.

14. The surface treatment agent composition according to any one of claims 8 to 13, wherein (d) in the surface treatment agent composition comprises one or more amino acids selected from histidine, lysine, and arginine.

15. The surface treatment agent composition according to any one of claims 8 to 14, further comprising one or more selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and sodium hydrogencarbonate.

16. The surface treatment agent composition according to any one of claims 8 to 15, further comprising one or more fatty acids selected from fatty acids having a carbon chain length of C8 to C22 and salts thereof.

17. A method for producing a cosmetic composition containing powder, comprising: A manufacturing method comprising surface-treating the powder by the method according to any one of claims 1 to 7.

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