Method for producing solid powder cosmetic

Abstract

To provide methods for producing a solid powder cosmetic that can contain a large amount of an oil agent, has both pigment dispersibility and luster, and further is excellent in use feeling.SOLUTION: Provided is a method for producing a solid powder cosmetic comprising the following steps (A) to (C): (A) mixing, at a peripheral speed of 6 to 39 m / s of the tip of a stirring blade, an oil, a powder, an aqueous solvent with an SP value of 21 (cal / cm3)1 / 2 or more, and a surfactant in an amount of 0 to 10 mass% with respect to the oil to form a slurry; (B) filling a cosmetic container with a cosmetic in the form of the slurry obtained in the step (A); and (C) removing the solvent from the cosmetic in the form of the slurry after the step (B).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a method for producing a solid powder cosmetic preparation. [Background technology]

[0002] There are two methods for manufacturing solid powder cosmetics: the dry method, in which a mixture of powder and oil is compressed and molded into an oil powder bulk, and the wet method, in which a volatile solvent such as water or alcohol is added to the oil powder bulk to make a slurry, which is then filled into a container and the volatile solvent is dried and removed to obtain the cosmetic. Compared to the dry method, the wet method is characterized by more uniform dispersion of the powder and oil, a fine powder texture, and a moist feel when used.

[0003] However, even in the wet method, it is difficult to sufficiently disperse the powder and oil agent uniformly, and there is a problem that the feeling of use is impaired by agglomerates of the powder and oil agent. In addition, when a large amount of oil agent is mixed, the oil agent seeps out during the process of mixing the powder and oil agent, making it difficult to handle, so there is a limit to the amount of oil agent that can be mixed. As a method for improving the dispersibility of the oil agent and the pigment, a method has been reported in which a powder component and an oil component as a binder are mixed in an organic solvent using a medium stirring mill to form a slurry (Patent Document 1). In addition, a method has been reported in which the dispersibility of the oil agent is improved by using a specific oil agent that dissolves in ethanol (Patent Document 2).

[0004] Although these methods improve the dispersibility of the oil, the oil dissolves in the dispersion solvent and may be removed together with the solvent when the solvent is sucked during molding. Therefore, there is a problem that a sufficient amount of oil cannot be left in the product. Furthermore, although the dispersibility of the pigment is improved when a mill or the like is used, there is a problem that the luster is reduced because the glitter pigment with a high aspect ratio is pulverized. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-213722 A [Patent Document 2] JP 2013-209316 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a method for producing a solid powder cosmetic preparation which can contain a high amount of oil, satisfies both the dispersibility and brilliance of pigments, and further has an excellent feel when used. [Means for solving the problem]

[0007] Therefore, the inventors have discovered that, when mixing an oil and a powder in an aqueous solvent having a specific SP value that does not completely dissolve the oil, by limiting the surfactant content to a specific amount or less and mixing with a stirring force higher than usual to form a slurry, which is then filled into a cosmetics container and the solvent is removed, it is possible to obtain a solid powder cosmetic product that can be blended at a high concentration with sufficient oil remaining in the product, has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is comfortable to use.

[0008] That is, the present invention relates to a method for producing a pharmaceutical composition comprising the following steps (A) to (C): (A) Oil, powder, SP value 21 (cal / cm 3 ) 1 / 2 a step of mixing 0 to 10 mass % of a surfactant with respect to the aqueous solvent and the oil solution, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. The present invention provides a method for producing a solid powder cosmetic comprising the steps of: Effect of the Invention

[0009] According to the present invention, it is possible to produce a solid powder cosmetic which allows a high content of oil to be incorporated and which leaves a sufficient amount in the product, has good pigment dispersibility with no agglomerates, has excellent brilliance, and is pleasant to use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The method for producing a solid powder cosmetic of the present invention is characterized by comprising the above-mentioned steps (A), (B) and (C). Each step will be explained below.

[0011] In step (A), oil, powder and a SP value of 21 (cal / cm 3 ) 1 / 2 This is a process in which the above aqueous solvent is mixed and stirred at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry. In step (A), the oil agent, the powder, the aqueous solvent, and 0 to 10% by mass of a surfactant relative to the oil agent are mixed and stirred to form a slurry. In this case, from the viewpoint of providing good dispersibility of the pigment and further improving the brilliance without causing any agglomerates, it is preferable not to mix the oil agent and the powder in advance. Examples of the oil agent that can be used include hydrocarbon oil, ester oil, ether oil, silicone oil, and higher alcohols having 10 to 24 carbon atoms.

[0012] More specifically, examples of the hydrocarbon oil include squalane, mineral oil (liquid paraffin, liquid isoparaffin, heavy liquid isoparaffin), etc. Among these hydrocarbon oils, from the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable to include at least one or more types selected from liquid paraffin, liquid isoparaffin, and squalane, and it is more preferable to include at least one type selected from liquid paraffin and squalane.

[0013] Ester oils include monoester oils, diester oils, triester oils and tetraester oils. Examples of monoester oils include monoesters of aliphatic or aromatic monocarboxylic or dicarboxylic acids having 2 to 24 carbon atoms. Specific examples include cetyl 2-ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, octyldodecyl myristate, myristyl myristate, 2-hexyldecyl myristate, isopropyl palmitate, octyl palmitate, 2-hexyldecyl palmitate, butyl stearate, isocetyl stearate, isocetyl isostearate, decyl oleate, isodecyl benzoate, octyl methoxycinnamate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, 2-ethylhexyl succinate, 2-hexyldecyl adipate, and alkyl benzoates (C12 to C15). Among these, from the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable to contain at least one or more types selected from cetyl ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, isopropyl myristate, and octyl methoxycinnamate, it is more preferable to contain at least one or more types selected from cetyl ethylhexanoate, isononyl isononanoate, and isotridecyl isononanoate, and it is even more preferable to contain at least one or more types selected from cetyl ethylhexanoate and isononyl isononanoate.

[0014] Examples of diester oils include diesters of dicarboxylic acids having 3 to 18 carbon atoms and difatty acid esters of polyhydric alcohols. Specific examples include propylene glycol dicaprylate, neopentyl glycol dicaprate, glycol distearate, propylene glycol diisostearate, glyceryl diisostearate, glyceryl monomyristate monoisostearate, glycerin di-2-heptylundecanoate, di-2-ethylhexyl succinate, diisopropyl sebacate, diisostearyl malate, ethylene glycol di-2-ethylhexanoate, diisobutyl adipate, di-2-heptylundecyl adipate, and di-2-ethylhexyl sebacate. Among these, from the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable to contain at least one or two or more selected from propylene glycol dicaprylate, neopentyl glycol dicaprate, glycol distearate, diisostearyl malate, and propylene glycol diisostearate, it is more preferable to contain at least one or two or more selected from propylene glycol dicaprylate, neopentyl glycol dicaprate, and diisostearyl malate, it is even more preferable to contain at least one or two or more selected from neopentyl glycol dicaprate and diisostearyl malate, and it is even more preferable to contain diisostearyl malate.

[0015] Examples of triester oils include tri-fatty acid esters of trihydric or higher polyhydric alcohols, and specific examples thereof include glycerin trimyristate, glycerin triisopalmitate, glycerin tri-2-heptylundecanoate, trimethylolpropane triethylhexanoate, trimethylolpropane trioctanoate, tri(capryl-capric)glycerin, trioleate, glycerin tri-2-ethylhexanoate, glycerin triisostearate, olive oil, jojoba oil, etc. Among these, from the viewpoint of obtaining a solid powder cosmetic composition that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable to include at least one or more selected from tri(capryl-capric)glycerin, trioleate, glycerin tri-2-ethylhexanoate, and glycerin triisostearate, and tri(capryl-capric)glycerin is more preferable.

[0016] Examples of tetraester oils include tetra-fatty acid esters of polyhydric alcohols having 4 or more valences, and specific examples thereof include pentaerythritol tetra(behenic acid / benzoic acid / ethylhexanoic acid), pentaerythritol tetraethylhexanoate, pentaerythritol tetraoctanoate, and pentaerythritol tetra-2-ethylhexanoate. Among these, from the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable to include at least one or more selected from pentaerythritol tetraethylhexanoate, pentaerythritol tetraoctanoate, and pentaerythritol tetra-2-ethylhexanoate, and it is more preferable to include pentaerythritol tetraethylhexanoate.

[0017] Examples of ether oils include dialkyl ethers, specifically dihexyl ether, dicaprylyl ether, cetyl-1,3-dimethylbutyl ether, etc. Among these, from the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable to contain at least one or more selected from dicaprylyl ether and cetyl-1,3-dimethylbutyl ether, and it is more preferable to contain cetyl-1,3-dimethylbutyl ether.

[0018] Examples of silicone oils include crosslinked methylpolysiloxane, reticular methylpolysiloxane, dimethylpolysiloxane, methyltrimethicone, dimethylcyclopolysiloxane, methylphenylpolysiloxane such as diphenylsiloxyphenyltrimethicone, and higher alcohol-modified organopolysiloxane. Among these, from the viewpoint of obtaining a solid powder cosmetic having good pigment dispersibility, no agglomerates, excellent brilliance, and excellent usability, it is preferable to include at least one or two or more selected from dimethylpolysiloxane, methyltrimethicone, dimethylcyclopolysiloxane, and methylphenylpolysiloxane, more preferably to include at least one or two or more selected from dimethylpolysiloxane, methyltrimethicone, and methylphenylpolysiloxane, and even more preferably to include at least one or two or more selected from dimethylpolysiloxane, methyltrimethicone, and diphenylsiloxyphenyltrimethicone. Moreover, it is even more preferable that the silicone oil includes a volatile silicone oil. Examples of volatile silicone oils include linear dimethylpolysiloxanes such as dimethylpolysiloxane (1cs), dimethylpolysiloxane (1.5cs), and dimethylpolysiloxane (2cs); branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. It is preferable to contain at least one or two or more types selected from linear dimethylpolysiloxanes and branched siloxanes, and it is more preferable to contain at least one or two or more types selected from dimethylpolysiloxane (1.5cs) and methyltrimethicone.

[0019] From the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is comfortable to use, the higher alcohol having 10 to 24 carbon atoms preferably contains at least one or more types selected from higher alcohols having 12 to 22 carbon atoms, more preferably contains at least one or more types selected from higher alcohols having 16 to 22 carbon atoms, even more preferably contains at least one or more types selected from higher alcohols having 18 to 22 carbon atoms, and even more preferably contains at least one or more types selected from higher alcohols having 18 and 22 carbon atoms.

[0020] From the viewpoint of obtaining a solid powder cosmetic preparation which has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, the oil agent preferably contains at least one or more types selected from mineral oil, ester oil, and silicone oil, more preferably contains at least one or more types selected from liquid paraffin, monoester oil, diester oil, and silicone oil, and even more preferably contains at least one or more types selected from liquid paraffin, monoester oil, diester oil, dimethylpolysiloxane, methyltrimethicone, and methylphenylpolysiloxane. As the oil agent, from the viewpoint of obtaining a solid powder cosmetic preparation that has good pigment dispersibility, is free of agglomerates, has excellent brilliance, and is excellent in usability, it is preferable that the oil agent be one that is liquid at 25° C. Furthermore, it is more preferable that the oil agent contains at least a volatile silicone oil.

[0021] The content of the oil in the solid powder cosmetic can be appropriately adjusted taking into consideration the feel when used, moldability, and impact resistance, and is, for example, preferably from 5% by mass to 30% by mass, more preferably from 7% by mass or more, even more preferably from 10% by mass or more, even more preferably from 12% by mass or more, even more preferably from 14% by mass or more, even more preferably from 16% by mass or more, and more preferably from 28% by mass or less, even more preferably from 25% by mass or less, and even more preferably from 22% by mass or less. In this specification, the content of a component is expressed as a mass ratio when the mass of the reference substance is taken as 100, and the unit is expressed in "mass %".

[0022] The powder used in the present invention preferably contains a glittering pigment, more preferably contains a coloring pigment and a glittering pigment, and further preferably contains a coloring pigment, a glittering pigment and an extender.

[0023] Luster pigments that can be used include plate-like powders such as mica, synthetic phlogopite, glass, silica, alumina, etc., the surface of which is coated with colorants such as titanium oxide, iron oxide, silicon oxide, Prussian blue, chromium oxide, tin oxide, chromium hydroxide, gold, silver, carmine, organic pigments, etc., as well as film rolls cut into any shape such as polyethylene terephthalate-polymethyl methacrylate laminated powder, polyethylene terephthalate-aluminum vapor-deposited powder, and polyethylene terephthalate-gold vapor-deposited laminated powder.

[0024] Examples of color pigments include metal oxides such as titanium oxide, zinc oxide, yellow iron oxide, red iron oxide, black iron oxide, Prussian blue, ultramarine blue, chromium oxide, and chromium hydroxide; metal complexes such as manganese violet and cobalt titanate; inorganic pigments such as carbon black; synthetic organic pigments such as Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue 404; and natural organic pigments such as β-carotene, caramel, and paprika color.

[0025] Examples of the extender pigment include inorganic pigments such as silicic acid, silicic acid anhydride, magnesium silicate, talc, sericite, boron nitride, mica, synthetic mica, glass flakes, synthetic phlogopite, kaolin, clay, bentonite, bismuth oxychloride, zirconium oxide, magnesium oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate, magnesium silicate, silica, and alumina, as well as composite powders of these.

[0026] Further, organic powders such as polyethylene powder, polypropylene powder, polymethyl methacrylate powder, nylon powder, polytetrafluoroethylene powder, silicone powder, silicone rubber powder, silk powder, urethane powder, cellulose powder, starch powder, and polyethylene fluoride; inorganic powders such as silica, magnesium carbonate, and calcium carbonate; acylated lysine powders such as lauroyl lysine; and metal soap powders which are higher fatty acid metal salts can be used.

[0027] Moreover, from the viewpoints of improving the dust removal properties of the solid powder cosmetic and improving spreadability on the skin, the above-mentioned organic powder and inorganic powder are preferably spherical powders, and it is more preferable to use the spherical powder in combination with at least one pigment selected from the group consisting of an extender pigment, a color pigment, and a luster pigment.

[0028] There are no limitations on the size, shape, etc. of these powders, and they can be used as they are, or can be subjected to a hydrophobic or hydrophilic treatment by a conventional method before use. The hydrophobization treatment is not limited as long as it is a treatment that is performed on ordinary cosmetic powders, and a dry treatment, a wet treatment, or the like may be performed using a surface treatment agent such as a fluorine compound, a silicone compound, a metal soap, an amino acid compound, lecithin, an alkylsilane, an oil agent, or an organic titanate. Specific examples of surface treatment agents include fluorine-based compounds such as perfluoropolyether, perfluoroalkyl phosphate ester, perfluoroalkylalkoxysilane, and fluorine-modified silicone; silicone-based compounds such as dimethylpolysiloxane, methylhydrogenpolysiloxane, cyclic silicone, organopolysiloxane modified with trialkoxy groups at one or both ends, crosslinked silicone, silicone resin, fluorine-modified silicone resin, and acrylic-modified silicone; metal stones such as aluminum stearate, aluminum myristate, zinc stearate, and magnesium stearate. Examples of suitable surfactants include soaps; amino acid compounds such as proline, hydroxyproline, alanine, glycine, sarcosine, glutamic acid, aspartic acid, lauroyl lysine, lysine and their derivatives, and acylated amino acids; lecithin, hydrogenated lecithin; alkyl silanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltriethoxysilane, octyltriethoxysilane, and triethoxycaprylylsilane; oils such as polyisobutylene, waxes, oils and fats, and fatty acids; and organic titanates such as isopropyl triisostearoyl titanate.

[0029] The hydrophilization treatment is not limited as long as it is a treatment that is applied to ordinary cosmetic powders. For example, plant-based polymers such as gum arabic, tragacanth, arabinogalactan, locust bean gum (carob gum), guar gum, karaya gum, carrageenan, pectin, agar, quince seed, starch (rice, corn, potato, wheat), algae colloid, trant gum, and locust bean gum; microbial polymers such as xanthan gum, dextran, succinoglucan, and pullulan; animal polymers such as collagen, casein, albumin, deoxyribonucleic acid (DNA) and its salts; and carboxymethyl dextran. Examples of suitable cellulose-based polymers include starch, methyl hydroxypropyl starch, and other starch-based polymers; cellulose-based polymers such as methyl cellulose, ethyl cellulose, methyl hydroxypropyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethyl cellulose, crystalline cellulose, and cellulose powder; alginic acid-based polymers such as sodium alginate and propylene glycol alginate; vinyl-based polymers such as polyvinyl methyl ether, polyvinylpyrrolidone, and carboxyvinyl polymer; polyoxyethylene-based polymers such as polyethylene glycol and polyethylene glycol silane; polyoxyethylene-polyoxypropylene copolymer-based polymers; acrylic-based polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylic acid amide, as well as inorganic silicic acid-based compounds such as silica.

[0030] The powder preferably contains a hydrophobic powder from the viewpoints of powder removal, spreadability upon application, and cosmetic durability, and more preferably is surface-treated with a fluorine compound, a silicone compound, a metal soap, an amino acid compound, lecithin, an alkylsilane, an oil, an organic titanate, or the like.

[0031] When the powder contains the above-mentioned hydrophobic powder, the content of the hydrophobic powder in the total powder is preferably 10% by mass or more, more preferably 30% by mass or more, and even more preferably 50% by mass or more.

[0032] The powders can be used alone or in combination of two or more kinds. The total content of the powders in the solid powder cosmetic of the present invention can be adjusted to any amount depending on the color tone, usability, and moldability, and is preferably from 70% to 95% by mass, more preferably from 73% to 90% by mass, even more preferably from 75% to 87% by mass, and even more preferably from 75% to 84% by mass, of the total amount of the solid powder cosmetic.

[0033] The content of the glittering pigment can be adjusted to any amount depending on color tone, usability, and moldability, and is preferably from 10% to 50% by mass, more preferably from 15% to 45% by mass, and even more preferably from 20% to 40% by mass, of the total amount of the solid powder cosmetic.

[0034] The content of the color pigment can be adjusted to any amount depending on the color tone, usability, and moldability, and is preferably from 2 to 30% by mass, more preferably from 5 to 25% by mass, and even more preferably from 5 to 20% by mass, of the total amount of the solid powder cosmetic.

[0035] The content of the extender pigment can be adjusted as desired depending on color tone, usability, and moldability, and is preferably from 10% to 60% by mass, more preferably from 15% to 55% by mass, and even more preferably from 20% to 50% by mass, of the total amount of the solid powder cosmetic.

[0036] The solvent used in step (A) has an SP value of 19 (cal / cm 3 ) 1 / 2 Any aqueous solvent with an SP value of 20 (cal / cm2) or more is acceptable, but from the viewpoint of leaving sufficient oil in the product, 3 ) 1 / 2 The aqueous solvent preferably has an SP value of 21 (cal / cm 3 ) 1 / 2 More preferably, the aqueous solvent has an SP value of 22 (cal / cm 3 ) 1 / 2 More preferred are aqueous solvents having the above properties. The SP value is a physical property defined as the square root of the cohesive energy density, and is a numerical value that indicates the dissolution behavior of a solvent. The SP value (theoretical value) of water is 23.4, the SP value (theoretical value) of n-hexane is 7.3, and the SP value (theoretical value) of ethanol is 12.7. In the present invention, from the viewpoint of allowing the oil to remain sufficiently in the product, it is preferable to use an aqueous solvent having an SP value that does not completely dissolve the oil, and the SP value is preferably 19 (cal / cm 3 ) 1 / 2 It is preferable to use an aqueous solvent having an SP value of 19 or more, and more preferable to use water or a water-ethanol solution having an SP value of 20 (cal / cm 3 ) 1 / 2 It is more preferable to use a water-ethanol solution having a calorie content of 21 (cal / cm 3 ) 1 / 2 It is even more preferable to use a water-ethanol solution having a calorie content of 22 (cal / cm 3 ) 1 / 2 It is even more preferable to use a water-ethanol solution having the above composition, and even more preferable to use water alone.

[0037] The amount of the aqueous solvent used may be any amount that is capable of forming a slurry of the oil and powder, and is, for example, preferably from 20% by mass to 200% by mass, more preferably from 40% by mass to 160% by mass, and even more preferably from 60% by mass to 140% by mass, relative to the total amount of the oil and powder.

[0038] In step (A) of the present invention, in addition to the oil, powder, and the aqueous solvent, surfactants, polyhydric alcohols, water-soluble polymers, cosmetic ingredients, fragrances, preservatives, UV absorbers, antioxidants, etc. may be added. When a surfactant is added, it is preferable that the amount of the surfactant is within the range of 12% by mass or less relative to the oil.

[0039] The surfactant is preferably used in order to uniformly disperse the oil and powder in the slurry and to prevent the formation of aggregates. The surfactant preferably contains a nonionic surfactant. The surfactant may be a non-silicone based nonionic surfactant or a silicone based nonionic surfactant.

[0043] The nonionic surfactants other than silicone-based surfactants are not limited as long as they are used in ordinary cosmetics, and examples thereof include sorbitan fatty acid esters such as sorbitan monoisostearate, glycerin fatty acid esters, polyglycerin fatty acid esters, propylene glycol fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene propylene glycol fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene phytostanol ether, polyoxyethylene phytosterose ether, polyoxyethylene cholestanol ether, polyoxyethylene cholesteryl ether, and the like. Examples of silicone-based nonionic surfactants include linear or branched polyether-modified silicones such as polyoxyethylene-methylpolysiloxane copolymers and polyoxyethylene-polydimethylsiloxyethyl dimethicone (specifically, PEG-9 polydimethylsiloxyethyl dimethicone); alkyl-modified polyether-modified silicones (specifically, cetyl PEG / PPG-10 / 1 dimethicone); and alkyl-chain-co-modified polyether-modified silicones such as alkyl-modified polyoxyethylene-polydimethylsiloxyethyl dimethicone (specifically, lauryl PEG-9 polydimethylsiloxyethyl dimethicone).

[0040] Among these, from the viewpoint of improving the stability of the slurry, it is preferable to include at least one or more selected from sorbitan fatty acid esters, linear or branched polyether modified silicones, alkyl modified polyether modified silicones, and alkyl modified polyoxyethylene-polydimethylsiloxyethyl dimethicones, more preferably to include at least one or more selected from sorbitan fatty acid esters, linear or branched polyether modified silicones, and alkyl modified polyether modified silicones, and more preferably to include at least one or more selected from sorbitan fatty acid esters and alkyl modified polyether modified silicones. It is also preferable to use a nonionic surfactant other than a silicone-based surfactant in combination with a silicone-based nonionic surfactant.

[0041] These nonionic surfactants preferably have an HLB of 3.5 to 16, more preferably 7 to 14, and even more preferably 8 to 12, from the viewpoint of improving the stability of the slurry. Here, HLB (Hydrophilic-Lipophilic Balance) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant, and for nonionic surfactants, it is calculated by Griffin's formula. The HLB of a mixed surfactant consisting of two or more nonionic surfactants is calculated as follows. The HLB of a mixed surfactant is the phase arithmetic average of the HLB values ​​of each nonionic surfactant based on their blending ratio. Mixed HLB=Σ(HLBx×Wx) / ΣWx HLBx indicates the HLB value of nonionic surfactant X. Wx indicates the mass (g) of nonionic surfactant X having the value of HLBx.

[0042] When a non-silicone-based nonionic surfactant and a silicone-based nonionic surfactant are used in combination among the surfactants, the mass ratio of the silicone-based nonionic surfactant to the non-silicone-based nonionic surfactant is preferably (silicone-based nonionic surfactant) / (non-silicone-based nonionic surfactant)=0.5 to 20, more preferably 1 to 10, and even more preferably 2 to 5, from the viewpoint of improving the stability of the slurry.

[0043] Such surfactants can be used alone or in combination of two or more kinds, and are preferably used from the viewpoint of emulsifying, uniformly dispersing the oil and powder in the slurry, and suppressing agglomeration. On the other hand, if the surfactant is blended in a large amount, the oil is easily removed at the same time when the solvent is removed from the slurried cosmetic in the subsequent step (C), making it difficult to leave a large amount of oil in the cosmetic. From the above points, it is preferable to use the surfactant in an amount of 0% by mass or more and 12% by mass or less, more preferably 0% by mass or more and less than 12% by mass, even more preferably 0% by mass or more and 10% by mass or less, even more preferably 0% by mass or more and 7% by mass or less, even more preferably 0% by mass or more and 5% by mass or less, even more preferably 0% by mass or more and 3% by mass or less, even more preferably 0% by mass or more and 2% by mass or less, and even more preferably 0% by mass.

[0044] In step (A), from the viewpoint of obtaining good dispersibility of the pigment without forming agglomerates and further improving brilliance, it is preferable to mix the oil agent, the powder, and the aqueous solvent to form a slurry without premixing the oil agent and the powder. The oil agent, the powder, and the aqueous solvent may be mixed at once, or the oil agent and the aqueous solvent may be mixed and then the powder may be mixed, or the powder and the aqueous solvent may be mixed and then the oil agent may be mixed.

[0045] The equipment used in this step may be any mixing equipment capable of uniformly mixing the oil, powder, and the aqueous solvent, and a high-speed dispersing machine such as a Homo Disper having a dispersing blade can be used. The peripheral speed of the stirring blade tip of the mixing device during mixing is preferably 6 m / s or more and 39 m / s or less, from the viewpoints of improving the dispersibility of the pigment and the oil agent, preventing the pulverization of the glittering pigment, and reducing the load during production, even when the surfactant content is 10% by mass or less relative to the oil agent. Also, from the viewpoints of the dispersibility of the pigment (suppression of agglomerates) and the dispersibility of the oil agent, it is more preferably 8 m / s or more, even more preferably 10 m / s or more, even more preferably 15 m / s or more, and even more preferably 20 m / s or more. Also, from the viewpoints of preventing the pulverization of the glittering pigment and reducing the load during production, it is more preferably 35 m / s or less, and even more preferably 30 m / s or less. The stirring time is preferably 1 minute or longer, more preferably 3 minutes or longer, and even more preferably 5 minutes or longer, from the viewpoints of pigment dispersibility (suppression of agglomerates) and oil dispersibility, and from the viewpoints of preventing pulverization of the luster pigment and reducing the load during production, the stirring time is preferably 120 minutes or shorter, more preferably 75 minutes or shorter, and even more preferably 60 minutes or shorter. From the viewpoints of pigment dispersion (agglomeration suppression) and oil dispersibility, the stirring temperature is preferably 15°C or higher, more preferably 20°C or higher, and even more preferably 25°C or higher. From the viewpoints of reducing the load on the mixing chamber and operational safety, the stirring temperature is preferably 90°C or lower, more preferably 80°C or lower, and even more preferably 70°C or lower.

[0046] Step (B) is a step of filling the cosmetic material in a slurry state obtained in step (A) into a cosmetic container. The cosmetic container used in step (B) is a container suitable for the intended solid powder cosmetic preparation, such as a container made of a resin such as PET resin, AS resin, ABS resin, or polycarbonate resin, or a container made of a metal such as aluminum or iron. The filling method is not particularly limited, and may be either front filling or back filling.

[0047] Step (C) is a step of removing the solvent from the slurry cosmetic after step (B). The timing for removing the solvent from the filled cosmetic material may be such that the solvent is removed by suction after the completion of filling the cosmetic container with the slurry, or the cosmetic container may be filled while the solvent is being removed by suction, but it is preferable to press-mold the cosmetic container while removing the solvent by suction. In addition, the solvent may be removed by vacuum suction or by absorption into a porous material, cloth, or paper. Here, the degree of vacuum when the solvent is removed by suction is preferably −5 kPa or more and 80 kPa or less, from the viewpoints of solvent removal efficiency and the load on the equipment during production.

[0048] Furthermore, if necessary, it is preferable to dry the solid powder cosmetic material. The drying method is not particularly limited, and natural drying may be used, but hot air drying and vacuum drying are preferably used. From the viewpoints of drying efficiency, the load on the equipment during production, and thermal degradation of the product, the drying temperature is preferably 20°C or higher, more preferably 25°C or higher, and even more preferably 30°C or higher, and is preferably 95°C or lower, more preferably 90°C or lower, and even more preferably 85°C or lower. The moisture content (moisture content) in the solid powder cosmetic after drying is preferably 0.01 to 1.0 mass %, more preferably 0.05 to 0.8 mass %, and even more preferably 0.1 to 0.5 mass %, from the viewpoints of the amount removed during use and drop resistance.

[0049] The solid powder cosmetic materials obtainable by the method of the present invention include make-up cosmetics such as eye color, foundation, blusher, eyeliner, face powder, and lipstick.

[0050] In relation to the above-mentioned embodiment, the present invention further discloses the following manufacturing method.

[0051] <1> Next steps (A)~(C): (A) Oil, powder, SP value 22 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and 0 to 7% by mass of a surfactant with respect to the oil solution, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <2> Next steps (A)~(C): (A) Oil, powder, SP value 22 (cal / cm 3 ) 1 / 2 a step of mixing 0 to 10 mass % of a surfactant with respect to the aqueous solvent and the oil solution, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 10 m / s to 30 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <3> Next steps (A)~(C): (A) Oil, powder, SP value 21 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and 0 to 7% by mass of a surfactant with respect to the oil solution, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 10 m / s to 30 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <4> Next steps (A)~(C): (A) Oil, powder, SP value 22 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and 0 to 7% by mass of a surfactant with respect to the oil solution, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 10 m / s to 30 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of:

[0052] <5> Next steps (A)~(C): (A) Powder containing oil, color pigment and luster pigment, SP value is 21 (cal / cm 3 ) 1 / 2 a step of mixing 0 to 10 mass % of a surfactant with respect to the aqueous solvent and the oil solution, and stirring the mixture for 5 to 60 minutes at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <6> Next steps (A)~(C): (A) Oil, powder, SP value 21 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and 0 to 10 mass % of a surfactant relative to the oil without premixing the oil and powder, and stirring the mixture for 5 to 60 minutes at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <7> Next steps (A)~(C): (A) Powder containing oil, color pigment and luster pigment, SP value is 21 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and a surfactant in an amount of 0 to 10 mass % relative to the oil without premixing the oil and the powder, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <8> Next steps (A)~(C): (A) Powder containing oil, color pigment and luster pigment, SP value is 21 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and 0 to 10 mass % of a surfactant relative to the oil without premixing the oil and powder, and stirring the mixture for 5 to 60 minutes at a peripheral speed of the tip of the stirring blade of 6 m / s to 39 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <9> Next steps (A)~(C): (A) Powder containing oil, color pigment and luster pigment, SP value 22 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the composition or more and 0 to 7 mass % of a surfactant relative to the oil agent without premixing the oil agent and the powder, and stirring the mixture for 5 to 60 minutes at a peripheral speed of the tip of the stirring blade of 10 m / s to 30 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <10> Next steps (A)~(C): (A) Oil, powder, and SP value of 19 (cal / cm 3 ) 1 / 2 and stirring the aqueous solvent having the above composition at a peripheral speed of the stirring blade tip of 6 m / s to 39 m / s to form a slurry. (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <11> Next steps (A)~(C): (A) Oil, powder, and SP value of 20 (cal / cm 3 ) 1 / 2and stirring the mixture at a peripheral speed of the tip of the stirring blade of 10 m / s or more and 30 m / s or less to form a slurry. (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: <12> Next steps (A)~(C): (A) Oil, powder, SP value 19 (cal / cm 3 ) 1 / 2 a step of mixing the aqueous solvent having the above composition and a surfactant in an amount of 0 to 12% by mass relative to the oil agent without premixing the oil agent and the powder, and stirring the mixture at a peripheral speed of the tip of the stirring blade of 10 m / s to 30 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of: EXAMPLES

[0053] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples in any way.

[0054] [Method of manufacturing molded products] Examples 1 to 15 and Comparative Examples 1 to 8 The amounts of solvent and oil shown in Table 1 were added to a beaker and stirred with a 40 mm disperser for 1 minute, after which the pigment was added and the mixture was further mixed with the disperser at a specified rotation speed at 25°C for 10 minutes to obtain a slurry. The obtained slurry was filled in a 27 mm x 27 mm metal plate with 3 g, and two pieces of cloth were placed between a press plate with suction holes and the metal plate, and pressed twice for 2 seconds with a pressure of 1 kN while removing the solvent from the suction holes by vacuum.Then, it was dried at 40°C for 24 hours to produce a solid powder cosmetic.

[0055] [Method for measuring the amount of oil in molded products (before drying)] Using an EXSTAR6000 (Hitachi High-Tech Science Corporation), 10 mg of the molded product was heated to 600° C. and continued to be heated until the mass no longer changed, and the amount of oil was calculated from the change in mass.

[0056]

number

[0057] (1) Change in mass when dried at 105°C for 3 hours (assuming water is included) (2) Change in mass when only the pigment is heated in the same manner (assuming the volatile components of the pigment)

[0058] [Sensory evaluation method for molded products (after drying)] Five members engaged in cosmetics research were asked to evaluate the prepared solid powder cosmetic products on a scale of one to five points for "visual agglomerations of color pigments," "visual brightness of lustrous pigments," and "smoothness when used," and the solid powder cosmetic product was given a score (scores were rounded off).

[0059] [Visual inspection of color pigment agglomerates] 5 points State of aggregates in Example 7 4 points: Slightly more aggregates than in Example 7 3 points: More aggregates than in Example 7 2 points: Fewer aggregates compared to Comparative Example 1 1 point: State of aggregates in Comparative Example 1

[0060] [Visual brightness of pigments] 5 points: The brightness of the luster pigment of Comparative Example 1 4 points: The luster of the glitter pigment is slightly weaker than that of Comparative Example 1. 3 points: The luster of the glitter pigment is slightly weaker than that of Comparative Example 1. 2 points: The luster of the glitter pigment is slightly stronger than that of Comparative Example 2 1 point: The brightness of the luster pigment of Comparative Example 2

[0061] [Moist and smooth when used] 5 points: The feeling when used is very moist and smooth (Example 4) 4 points: The moist and smooth feel when used is slightly inferior to Example 4. 3 points: The moist and smooth feel when used is slightly inferior to Example 4. 2 points: The moist and smooth feel when used is inferior to Example 4. 1 point: The texture is rough and feels like there is something foreign in it when using it (Comparative Example 4)

[0062] The formulation of the solid powder cosmetic produced, the type of solvent and SP value, production conditions, and evaluation results of the molded products are shown in Table 1.

[0063] [Table 1]

[0064] *1: Sericite FSE (Sanshin Mining Co., Ltd.) *2: Talc JA68R (Asada Flour Milling Co., Ltd.) *3: Synthetic iron oxide BL-100P (Titanium Industries Co., Ltd.) *4: FLAMENCO SUPER PEARL (BASF SE) *5: Mineral oil (Sonneborn, LLC) *6: Leodor 430V LOT2085 (Kao Corporation)

[0065] From Table 1, the SP value of the oil, powder, and 3 ) 1 / 2 It can be seen that by adopting step (A) in which 0 to 10% by mass of a surfactant is mixed with the aqueous solvent and oil as described above and mixed at a peripheral speed of the tip of the stirring blade of 6 to 39 m / s to form a slurry, it is possible to produce a solid powder cosmetic preparation that is excellent in feel when used and that achieves both good pigment dispersibility and brilliance.

Claims

1. The following steps (A) to (C): (A) A powder containing one or more oils selected from hydrocarbon oils, ester oils, ether oils, silicone oils, and higher alcohols having 10 to 24 carbon atoms, and a luster pigment; and an SP value of 21 (cal / cm 3 ) 1 / 2 a step of mixing an aqueous solvent having a viscosity of 23.4 (cal / cm3)1 / 2 or less and 0 to 10 mass% of a nonionic surfactant relative to the oil agent, and mixing the mixture at a peripheral speed of the tip of the stirring blade of 10 m / s to 30 m / s to form a slurry; (B) filling the slurry cosmetic material obtained in step (A) into a cosmetic container; (C) After step (B), a step of removing the solvent from the slurry cosmetic. A method for producing a solid powder cosmetic comprising the steps of:

2. 2. The solid powder makeup according to claim 1, wherein the powder contains a color pigment and a glitter pigment. Manufacturing method of ingredients.

3. A method for producing a solid powder cosmetic preparation as described in claim 1 or 2, wherein the amount of the nonionic surfactant used is 0 to 7 mass % relative to the oil.

4. The SP value of the aqueous solvent is 22 (cal / cm 3 ) 1 / 2 4. The method for producing a solid powder cosmetic preparation according to claim 1, wherein the viscosity is from 1 to 23.4 (cal / cm 3 ) 1 / 2 .

5. The method for producing a solid powder cosmetic preparation according to any one of claims 1 to 4, wherein the temperature during mixing is 15°C or higher and 90°C or lower.

6. The method for producing a solid powder cosmetic preparation according to any one of claims 1 to 5, wherein the mixing time is from 1 minute to 120 minutes.

7. 7. The method for producing a solid powder cosmetic according to any one of claims 1 to 6, wherein step (A) is a step of mixing an oily agent, a powder, and the aqueous solvent to form a slurry without premixing the oily agent and the powder.

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