Manufacturing method of powdered solid cosmetic product

Abstract

The purpose of the present invention is to provide a method for producing a powdered solid cosmetic having excellent dispersibility of a powder and high impact resistance while ensuring the same level of usability as the case where an elastic spherical powder is blended.　A method for producing a powdered solid cosmetic according to the present invention is characterized by comprising a slurry preparation step for mixing a powder component and an oil component as a binder in a volatile solvent to form a slurry, wherein: the powder component contains a spherical powder; the spherical powder contains (A) an inelastic spherical powder having a crushing strength of at least 30 MPa per particle; the oil component contains (B) a gel-like partially crosslinked organopolysiloxane polymer; the (A) inelastic spherical powder accounts for 6-20 mass% of the powdered solid cosmetic; and the (A) inelastic spherical powder accounts for at least 90 mass% of the spherical powder contained in the power component.

Description

[Technical field]

[0001] The present invention relates to a method for producing a solid cosmetic product in powder form. More specifically, the present invention relates to a method for producing a solid cosmetic product in powder form that can achieve excellent usability without substantially blending elastic spherical powder, and that also has excellent powder dispersibility and high impact resistance. [Background technology]

[0002] Solid powder cosmetics are cosmetic bases that are widely used in foundations, eye shadows, etc. In general, solid powder cosmetics are composed of a powder as the main ingredient and an oil that acts as a binder or adhesive. The powder portion is the main base material of the cosmetic, and therefore has a significant impact on usability, such as spreadability, smoothness, and uniform finish on the skin. Among them, spherical powders improve slipperiness by rolling on the skin, and play an important role in realizing a light spreadability and smooth finish.

[0003] As the spherical powder, synthetic resins such as polymethylmethacrylate (PMMA), nylon, and urethane are often used, particularly in order to improve the smoothness and softness of the feel. However, among these, elastic spherical powders have a relatively high flexibility, but because of their spherical shape, the contact surface with other powders is small, and because of their elasticity, they are difficult to solidify and have poor moldability. Therefore, although they can impart excellent usability to solid cosmetic powders, it is difficult to achieve sufficient impact resistance at the same time.

[0004] Attempts have been made to improve the impact resistance of solid powder cosmetics containing elastic spherical powders, and proposals have been made, for example, to use a solid oil powder atomized by a gas evaporation method as a binder (Patent Document 1), to incorporate a spherical polyolefin resin powder (Patent Document 2), to use a mixer with opposing rotors of a specific structure (Patent Document 3), etc. However, there are limitations such as the need to use specific raw materials and specific equipment, and further improvements in impact resistance are desired. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-272427 A [Patent Document 2] JP 2006-169207 A [Patent Document 3] JP 2009-167181 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a method for producing a solid cosmetic preparation in powder form that has excellent powder dispersibility and high impact resistance while having the same level of usability as when an elastic spherical powder is blended. [Means for solving the problem]

[0007] The present inventors have conducted intensive research to solve the above-mentioned problems, and as a result have found that a solid cosmetic product in powder form can be produced by using a specified non-elastic spherical powder and a gel-like partially crosslinked organopolysiloxane polymer as raw materials for the solid cosmetic product in powder form, dissolving or dispersing a mixture containing these raw materials in a volatile solvent to form a slurry, removing the volatile solvent from the slurry, and then drying the slurry, thereby achieving excellent usability, dispersibility, and impact resistance in a solid cosmetic product in powder form, and have thus completed the present invention.

[0008] That is, the present invention provides a method for producing a solid cosmetic product in powder form, comprising a slurry preparation step of mixing a powder component and an oily component as a binder in a volatile solvent to form a slurry, The powder component contains a spherical powder, and the spherical powder contains (A) a non-elastic spherical powder having a crushing strength per particle of 30 MPa or more, the oil component contains (B) a gel-like partially crosslinked organopolysiloxane polymer, The (A) non-elastic spherical powder accounts for 6 to 25% by mass of the solid cosmetic preparation in powder form, The gist of the present invention is a method for producing a solid cosmetic product in powder form, in which (A) non-elastic spherical powder accounts for 90% by mass or more of the spherical powder contained in the powder component.

[0009] It is generally known that when a high content of (A) non-elastic spherical powder is used, the impact resistance is improved compared to when an elastic spherical powder is used, but the texture becomes noticeably dry and difficult to use. In addition, when the gel-type partially crosslinked organopolysiloxane polymer (B), which is a high-viscosity fluid, is added to the powder, the powder tends to aggregate and become difficult to disperse uniformly, although the usability can be improved. In particular, when the gel-type partially crosslinked organopolysiloxane polymer (B) is used in combination with an elastic spherical powder, there are cases where the cosmetic composition has uneven filling, such as dark and light colored areas, or where impact resistance is significantly impaired. For this reason, it was expected that the aggregation of the powder would be unavoidable even when the gel-type partially crosslinked organopolysiloxane polymer (B) is used in combination with a non-elastic spherical powder.

[0010] However, by using a powder having a crushing strength per particle of 30 MPa or more as the non-elastic spherical powder to be combined with the gel-like partially crosslinked organopolysiloxane polymer (B), and further by manufacturing a cosmetic through a process of mixing these in a volatile solvent to form a slurry, it was surprisingly found that the non-elastic spherical powder greatly improves the dispersibility of the powder, thereby preventing the powder from agglomerating and achieving a smooth, spreadable usability without a dry feeling. Effect of the Invention

[0011] The present invention makes it possible to produce a solid cosmetic product in powder form that has sufficient usability without blending elastic spherical powders that have been widely used in conventional solid cosmetic products in powder form, and that also has excellent uniform powder dispersibility and impact resistance. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The method for producing a solid cosmetic product in powder form of the present invention includes using (A) a non-elastic spherical powder and (B) a gel-like partially crosslinked organopolysiloxane polymer as raw materials for the solid cosmetic product in powder form, and mixing these in a volatile solvent to form a slurry. The method will be described in detail below.

[0013] <(A) Non-elastic spherical powder> The non-elastic spherical powder (A) used in the present invention may be either an inorganic or organic spherical powder, so long as the crushing strength per particle is 30 MPa or more, preferably 35 MPa or more, more preferably 40 MPa or more. The crushing strength per particle in the present invention is a value calculated by applying a load force at a constant increasing rate to a sample particle using a Shimadzu Corporation microcompression tester MCT-211, and calculating the strength at the time when the particle breaks. If the crushing strength is less than 30 MPa, the flexibility is too high and it is difficult to provide sufficient molding strength, and the dispersibility of the powder cannot be sufficiently improved.

[0014] The average particle size of the non-elastic spherical powder (A) is in the range of 1 to 30 μm, preferably in the range of 3 to 20 μm, and more preferably in the range of 5 to 15 μm. If the average particle size is less than 1 μm, the smoothness of the cosmetic composition when applied is lost, and if it exceeds 30 μm, a squeaky or gritty foreign body sensation tends to occur. The shape of the (A) non-elastic spherical powder must be spherical, but it does not have to be strictly spherical, and for example, it may be spherical with an elliptical cross section. A spherical shape is preferable in that it provides a smoother and more comfortable feel.

[0015] (A) Examples of the non-elastic spherical powder include spherical silica, spherical alumina, spherical titania, and spherical calcium carbonate. In particular, spherical silica is preferred from the viewpoint of usability, and porous silica particles are more preferred. Furthermore, the non-elastic spherical powder may be surface-treated. Examples of the surface treatment include silicone compound treatment, fluorine-modified silicone compound treatment, fluorine compound treatment, higher fatty acid treatment, higher alcohol treatment, fatty acid ester treatment, metal soap treatment, amino acid treatment, and alkyl phosphate treatment. (A) The non-elastic spherical powder may be a commercially available product, such as Satinier M-5 (JGC Catalysts and Chemicals Co., Ltd.) or Sunsphere L-51 (AGC Si-Tech Co., Ltd.).

[0016] The blending amount of the (A) non-elastic spherical powder in the present invention is 6 to 25% by mass, preferably 8 to 20% by mass, and more preferably 10 to 15% by mass, based on the total amount of the solid cosmetic powder. If the amount of the (A) non-elastic spherical powder in the solid cosmetic powder is less than 6% by mass, the usability is poor, the dispersibility of the powder is impaired, and aggregation may occur. Also, even if the blending amount exceeds 25% by mass, the usability, moldability, and impact resistance commensurate with the blending amount tend not to be obtained.

[0017] The (A) non-elastic spherical powder must account for 90% by mass or more of the total spherical powder contained in the cosmetic, preferably 95% by mass or more, and more preferably 99% by mass or more. If the proportion of the (A) non-elastic spherical powder in the total spherical powder is less than 90% by mass, the dispersibility of the powder may be impaired, and aggregation may occur.

[0018] Here, the "spherical powder" other than the (A) non-elastic spherical powder that may be contained in the solid cosmetic in powder form of the present invention is a concept that includes all powders that are elastic and spherical, and examples thereof include silicone elastomer powder, silicone powder, silicone resin-coated silicone elastomer powder, polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, polyurethane resin powder, etc.

[0019] However, from the viewpoint of moldability and impact resistance, it is preferable not to mix elastic powder, regardless of whether it is spherical or non-spherical.

[0020] The total amount of spherical powder (including elastic and non-elastic) contained in the solid cosmetic product in powder form of the present invention is 1 to 30% by mass, more preferably 5 to 25% by mass, and even more preferably 5 to 15% by mass, based on the total amount of the solid cosmetic product in powder form. If the amount of spherical powder is less than 1% by mass, sufficient usability cannot be obtained, and if it is more than 30% by mass, moldability and impact resistance tend to be poor.

[0021] In order to further improve usability and moldability, the (A) non-elastic spherical powder preferably accounts for 5% by mass or more of the total powder contained in the cosmetic, more preferably 6% by mass or more or 7% by mass or more, and particularly preferably 10% by mass or more. On the other hand, the (A) non-elastic spherical powder is preferably 30% by mass or less of the total powder contained in the cosmetic, more preferably 25% by mass or less, and even more preferably 20% by mass or less. Even if the ratio of the (A) non-elastic spherical powder in the entire powder is increased, it tends not to obtain usability, moldability, and impact resistance commensurate with the blending amount.

[0022] <(B) Gel-like partially cross-linked organopolysiloxane polymer> The component (B) used in the present invention is a polymer obtained by crosslinking organopolysiloxane and then swelling it into a gel-like state with a liquid silicone oil solvent.

[0023] Examples of the partially crosslinked organopolysiloxane polymer constituting the component (B) include partially crosslinked methylpolysiloxanes such as (dimethicone / vinyl dimethicone) crosspolymer and (dimethicone / phenylvinyl dimethicone) crosspolymer; partially crosslinked alkyl-polyether co-modified silicones such as (PEG-15 / lauryl dimethicone) crosspolymer, (dimethicone / PEG-10 / 15) crosspolymer and (PEG-15 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer; partially crosslinked polyglycerin-modified silicones such as (dimethicone / polyglycerin-3) crosspolymer, and the like. These can be used alone or in combination of two or more. Among these, (dimethicone / vinyl dimethicone) crosspolymer is particularly preferred.

[0024] Specific examples of the liquid silicone oil, which is the solvent constituting component (B), include volatile cyclic silicone oils such as dimethicone, cyclopentasiloxane, and methyltrimethicone, as well as volatile linear silicone oils. Of these, dimethicone is particularly preferred.

[0025] The content of the partially crosslinked organopolysiloxane polymer in the component (B) is preferably from 10 to 30 mass %, and more preferably from 15 to 25 mass %.

[0026] The component (B) can be a commercially available product, and examples thereof include KSG-16 (a mixture of (dimethicone / vinyl dimethicone) crosspolymer and dimethicone 6cs, the crosslinked product being 20 to 30%), KSG-19 (a mixture of (dimethicone / vinyl dimethicone) crosspolymer and dimethicone 6cs, the crosslinked product being 10 to 20%), KSG-310 (a mixture of (PEG-15 / lauryl dimethicone) crosspolymer and liquid paraffin, the crosslinked product being 25 to 35%), and KSG-710 (a mixture of (dimethicone / polyglycerin-3) crosspolymer and dimethylpolysiloxane, the crosslinked product being 25 to 35%). Examples of such crosslinked products include KSG-18A (a mixture of (dimethicone / phenylvinyl dimethicone) crosspolymer, diphenylsiloxyphenyl trimethicone, crosslinked product being 10-20%), KSG-210 (a mixture of (dimethicone / PEG-10 / 15) crosspolymer, dimethicone, crosslinked product being 20-30%), and KSG-360Z (a mixture of (PEG-15 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer, dimethicone, crosslinked product being 30-40%) (all manufactured by Shin-Etsu Chemical Co., Ltd.).

[0027] The blending amount of component (B) in the present invention is 1 to 15% by mass, preferably 2 to 10% by mass, and more preferably 3 to 7% by mass, based on the total weight of the solid cosmetic powder. If the blending amount is less than 1% by mass, usability may be poor, and if it is more than 15% by mass, uniformity during application may be lost.

[0028] <Optional ingredients> In addition to the above-mentioned components (A) and (B), the solid cosmetic preparation in powder form produced according to the present invention may contain other components that are commonly used in cosmetics, provided that they do not impair the effects of the present invention. For example, powder components, oily components, surfactants, UV protection agents, and the like other than those mentioned above may be appropriately blended as required.

[0029] Powder components other than those mentioned above are not particularly limited as long as they can be used in general cosmetics, and examples thereof include talc, kaolin, sericite, muscovite, gold mica, synthetic mica, synthetic fluorine gold mica, red mica, biotite, calcined talc, calcined sericite, calcined muscovite, calcined gold mica, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soap (e.g., zinc myristate, calcium palmitate, aluminum stearate, etc.), photochromic titanium oxide (iron oxide sintered into dioxide), and the like. titanium,), reduced zinc oxide; organic powders (e.g., silicone elastomer powder, silicone powder, silicone resin-coated silicone elastomer powder, polyamide resin powder (nylon powder), polyethylene powder, polystyrene powder, styrene and acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red oxide), iron titanate, etc.); inorganic brown pigments (e.g., gamma-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, ocher, etc.); inorganic black pigments (e.g., black iron oxide, low-order titanium oxide, etc.); inorganic purple pigments (e.g., mango violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.);Pearl pigments (for example, bismuth oxychloride, fish scale foil, titanium mica, titanium mica coated with iron oxide, titanium mica coated with low-order titanium oxide, titanium mica having photochromic properties, substrates using talc, glass, synthetic fluorine phlogopite, silica, bismuth oxychloride, etc. instead of mica, coatings coated with low-order titanium oxide, colored titanium oxide, iron oxide, alumina, silica, zirconia, zinc oxide, cobalt oxide, aluminum, etc. in addition to titanium oxide, functional pearl pigments coated with resin particles (JP Patent Publication No. 11-92688), coated with aluminum hydroxide particles (JP Patent Publication No. 2002-146238), coated with zinc oxide particles (JP Patent Publication No. 2003-26142) 1), pearl pigments with barium sulfate particles coated on the surface (Japanese Patent Application No. 2003-61229), etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium or aluminum lake (e.g., Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3 and Blue No. 1, etc.); natural pigments (e.g., chlorophyll, β-carotene, etc.);

[0030] The oily component is not particularly limited as long as it can be used in general cosmetics, and examples of the oily component include liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, etc. In the following description, POE is an abbreviation for polyoxyethylene, and POP is an abbreviation for polyoxypropylene, and the number in parentheses after POE or POP indicates the average number of moles of POE groups or POP groups added in the compound.

[0031] Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin. Examples of solid fats and oils include cacao butter, coconut oil, horse oil, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan Rice Kernel Oil, hardened oil, beef foot fat, Japan Rice, and hardened castor oil.

[0032] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivory wax, whale wax, montan wax, bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0033] Examples of the hydrocarbon oil include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0034] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tallic acid, isostearic acid, linoleic acid, linoleic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0035] Examples of higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.); branched-chain alcohols (e.g., monostearyl glycerin ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); and the like.

[0036] Synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, tetra-2-ethylhexanoate, Examples of the fatty acids that can be used include pentaerythritol phosphate, glycerin tri-2-ethylhexanoate, glycerin trioctanoate, glycerin triisopalmitate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoate glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0037] Examples of silicone oils include silicone compounds such as dimethylpolysiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, stearoxymethylpolysiloxane, polyether-modified organopolysiloxane, fluoroalkyl-polyoxyalkylene-co-modified organopolysiloxane, alkyl-modified organopolysiloxane, terminal-unmodified organopolysiloxane, fluorine-modified organopolysiloxane, amino-modified organopolysiloxane, silicone gel, acrylic silicone, trimethylsiloxysilicate, and silicone RTV rubber.

[0038] The surfactant preferably contains a lipophilic nonionic surfactant. The lipophilic nonionic surfactant preferably has an HLB of 2 to 10, more preferably 3 to 6. For example, POE(2) stearyl ether, self-emulsifying propylene glycol monostearate, glyceryl myristate, glyceryl monostearate, self-emulsifying glyceryl monostearate, glyceryl monoisostearate, glyceryl monooleate, hexaglyceryl tristearate, decaglyceryl pentastearate, decaglyceryl pentaisostearate, decaglyceryl pentaoleate, sorbitan monostearate, sorbitan tristearate, sorbitan monoisostearate, sorbitan sesquiisostearate, sorbitan monooleate, POE(6) sorbit hexastearate, POE(3) castor oil, PEG(2) monostearate, ethylene glycol monostearate, PEG(2) stearate, and the like.

[0039] As the ultraviolet protection agent (ultraviolet absorbing agent and / or ultraviolet scattering agent), those usually incorporated in cosmetics can be used.

[0040] The ultraviolet absorber is not particularly limited, and may be any ultraviolet absorber generally used in cosmetics. For example, benzoic acid-based ultraviolet absorbers (e.g., para-aminobenzoic acid (hereinafter, abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based ultraviolet absorbers (e.g., amyl salicylate, menthyl salicylate, homomenthyl salicylate, etc.); cinnamic acid-based ultraviolet absorbers (e.g., octyl methoxycinnamate, ethyl-4-isopropyl cinnamate, methyl-2,5-diisopropyl cinnamate, ethyl-2,4-diisopropyl cinnamate, methyl-2,4-diisopropyl cinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl- p-Methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-paramethoxycinnamate, etc.; benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 '-Dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone, etc.);3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor; 2-phenyl-5-methylbenzoxazole; 2,2'-hydroxy-5-methylphenylbenzotriazole; 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenylbenzotriazole; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, dimorpholinopyridazino; 2-ethylhexyl-2-cyano-3,3-diphenylacrylate; 2,4-bis-{[4-(2-ethylhexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-(1,3,5)-triazine, and the like.

[0041] The ultraviolet scattering agent is not particularly limited, but specific examples include fine particle metal oxides such as zinc oxide, titanium oxide, iron oxide, cerium oxide, and tungsten oxide. The ultraviolet scattering agent may be untreated or may be hydrophobically treated. Surface treatment agents that are commonly used in the field of cosmetics include silicones such as dimethicone and alkyl-modified silicone, alkoxysilanes such as octyltriethoxysilane, dextrin fatty acid esters such as dextrin palmitate, and fatty acids such as stearic acid.

[0042] Furthermore, the solid cosmetic preparation in powder form of the present invention may also contain pH adjusters, moisturizers, thickeners, dispersants, stabilizers, colorants, preservatives, antioxidants, fragrances, and the like as appropriate within the scope of the object of the present invention.

[0043] In addition, polyhydric alcohols that are usually blended into cosmetics can also be blended into the solid cosmetic powder of the present invention, but since this tends to reduce adhesion, it is preferable to keep the blending amount to 1% by mass or less of the entire solid cosmetic powder, and it is even more preferable to not blend it at all (0% by mass). Representative examples of polyhydric alcohols include dipropylene glycol, 1,3-butylene glycol, isopentyl diol, 1,2-pentanediol, 1,2-hexanediol, polyethylene glycol, glycerin, diglycerin, sorbitol, maltitol, raffinose, etc.

[0044] <Manufacturing method> The method for producing the solid cosmetic product in powder form of the present invention is not particularly limited as long as it includes a "slurry preparation step" in which a powder component and an oily component serving as a binder are mixed in a volatile solvent to form a slurry, and any known method can be used.

[0045] The powder component and the oil component can be mixed in a volatile dispersion medium to form a slurry by the following method. The powder component and oil component are dry mixed / disintegrated in advance using a Henschel Mixer (registered trademark) or a pulverizer, etc., and then added to a volatile dispersion medium, and mixed / dispersed using a Disper Mixer, a homogenizer, a planetary mixer, a Combimix (registered trademark), an Ajihomo Mixer, a twin-screw kneader, etc. When the oil component contains oil that becomes solid or pasty at 25°C, it is preferable to heat and dissolve the oil component and then dry mix it with the powder component.

[0046] In the slurry preparation process, the ratio (mass ratio) of the powder component to the oil component depends on the type of oil component and powder component used, but is preferably powder component / oil component = 60 / 40 to 99.5 / 0.5. The amount of the volatile dispersion medium used at this time cannot be specified because it depends on the polarity, specific gravity, etc. of the volatile dispersion medium used, but it is important to ensure sufficient fluidity during filling and molding, and usually about half to twice the amount of the cosmetic constituents is used.

[0047] The volatile solvent is not particularly limited, but includes purified water, cyclic silicone, light liquid isoparaffin, lower alcohol, ethers, LPG, fluorocarbon, N-methylpyrrolidone, fluoroalcohol, volatile linear silicone, etc. Representative examples of lower alcohol include ethanol and isopropanol. These solvents are used by mixing one or more types depending on the characteristics of the blending components used.

[0048] The method for removing the volatile solvent from the slurry obtained in the "slurry preparation step" and drying it to obtain a powdered solid cosmetic product is not particularly limited, and any known method can be used. For example, the method includes filling the slurry into a container such as a metal or resin inner plate by injection filling, removing the volatile solvent in the filled slurry by suction press molding, and then drying it using a suitable dryer to obtain a powdered solid cosmetic product ("wet manufacturing method"), and a method in which the slurry is made into fine droplets by mechanical shearing force, drying the fine droplets by blowing dry gas into the fine droplets, and performing normal dry molding on the obtained dried powder to obtain a powdered solid cosmetic product (hereinafter, for convenience, this manufacturing method may be referred to as the "W&D manufacturing method" in this document). The powdered solid cosmetic product obtained by the W&D manufacturing method has a feel in use that is equal to or better than that of the wet manufacturing method, while also having the advantage of dry molding, which is good usability (ease of application to a puff). Details of the W&D manufacturing method are described, for example, in JP 2007-55990 A.

[0049] The product form of the powder solid cosmetic according to the present invention can be any product form within the category of powder cosmetics, such as foundation, eye shadow, cheek color, body powder, perfume powder, baby powder, pressed powder, deodorant powder, face powder, etc. EXAMPLES

[0050] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. The blending amount is expressed in mass% relative to the system in which the component is blended, unless otherwise specified. Before specifically describing each example, the evaluation method used will be described.

[0051] <Dispersibility> The presence or absence of aggregation in the prepared powder solid cosmetic preparations was visually confirmed. A: No aggregation was observed. B: A small amount of aggregation was observed. C: The aggregation was so severe that it was unsuitable for use.

[0052] <Impact resistance> The powdered solid cosmetic product was placed in a cosmetic compact container, and dropped from a height of 50 cm onto a metal plate with the cosmetic surface facing downwards, and the number of times it could be dropped before it broke was counted. The number of times each cosmetic product could be dropped before it broke was used to evaluate its impact resistance. Products that could withstand 7 or more drops were deemed to have good impact resistance.

[0053] <Usability> A panel of 10 experts applied the prepared powdered solid cosmetic products to the face and evaluated how light and smooth it spread when applied. A: More than 8 out of 10 panelists answered that it was easy to use. B: Between 5 and 8 out of 10 panelists answered that the product was easy to use. C: Fewer than 5 out of 10 panelists answered that it was easy to use.

[0054] <Example 1 and Comparative Examples 1 and 2> The powdered solid cosmetics of Example 1 and Comparative Examples 1 and 2 shown in Table 1 below were prepared by the W&D method. Specifically, the powdered components, oily components, and other components shown in the formulations in Table 1 were mixed, and then mixed with twice the amount of water of the mixture using a disper mixer, after which the mixture was crushed, pulverized, and dispersed using a media stirring mill (sand grinder mill) filled with zirconia beads of 2 mmφ. The resulting slurry was then dried in the form of fine droplets using a stirring dryer (spin flash dryer, manufactured by APV Nordic Anhyro) while blowing dry gas, to obtain a dry powder. The obtained dry powder was filled into a resin container and dry-pressed by a known method to obtain a solid powder cosmetic.

[0055] <Comparative Example 3> The solid cosmetic powder preparation of Comparative Example 3 shown in Table 1 below was prepared by a dry method. Specifically, the powder components, oily components, and other components shown in the formulation in Table 1 were mixed in a Henschel mixer, pulverized in a pulverizer, and then filled into a resin container and dry-press molded by a known method to obtain a solid cosmetic powder preparation.

[0056] The obtained solid cosmetic powder preparation was evaluated for the above items. The evaluation results are shown in Table 1.

[0057] [Table 1] *1 Satinia M5 (JGC Catalysts and Chemicals Co., Ltd.) *2 KSG-16 (Shin-Etsu Chemical Co., Ltd.)

[0058] As shown in Table 1, even when the component corresponding to (A) non-elastic spherical powder was blended at a high concentration, by adding the component corresponding to (B) gel-like partially crosslinked organopolysiloxane polymer and manufacturing using a W&D method including a slurry preparation step, sufficient evaluation results were obtained in terms of dispersibility, impact resistance, and usability (Example 1). On the other hand, when either component (A) or component (B) was absent, the evaluation results were low in either item (Comparative Examples 1 and 2). In particular, when the component corresponding to the non-elastic spherical powder (A) was not included, the dispersibility was insufficient (Comparative Example 2), confirming that component (A) also contributes to dispersibility. Furthermore, when a cosmetic preparation having the same composition as that of Example 1 was prepared by a dry method not including a slurry preparation step, the dispersibility and impact resistance were insufficient (Comparative Example 3). This confirmed the need to stir and mix the (A) and (B) components in the slurry.

[0059] <Example 2> The powdered solid cosmetic preparation of Example 2 shown in Table 2 below was prepared by a wet process. Specifically, the powdered components, oily components, and other components shown in the formula in Table 2 were mixed, and the mixture was mixed with an equal amount of water using a dispersing mixer, after which a slurry was obtained by crushing / pulverizing / dispersing using a media stirring mill (sand grinder mill) filled with zirconia beads of 2 mmφ. This slurry was filled into a resin container, and the solvent was removed by vacuum suction to obtain a powdered solid cosmetic preparation.

[0060] <Examples 3 to 6 and Comparative Example 4> A powdered solid cosmetic product having the formula shown in Table 2 below was prepared by the W&D method. Specifically, the powdered components, oily components, and other components shown in the formula in Table 2 were mixed, and then mixed with twice the amount of water of the mixture using a disper mixer, after which the mixture was crushed, pulverized, and dispersed using a media stirring mill (sand grinder mill) filled with zirconia beads of 2 mmφ. The resulting slurry was then dried in the form of fine droplets using a stirring dryer (spin flash dryer, manufactured by APV Nordic Anhyro) while blowing dry gas, to obtain a dry powder. The obtained dry powder was filled into a resin container and dry-pressed by a known method to obtain a solid powder cosmetic. The obtained solid cosmetic powder preparation was evaluated for the above items. The evaluation results are shown in Table 2.

[0061] [Table 2] *1 Satinia M5 (JGC Catalysts and Chemicals Co., Ltd.) *2 KSG-16 (Shin-Etsu Chemical Co., Ltd.) *3 KSG-18A (Shin-Etsu Chemical Co., Ltd.) *4 KSG-210 (Shin-Etsu Chemical Co., Ltd.) *5 KSG-360Z (Shin-Etsu Chemical Co., Ltd.) *6 Cosmoll 182V (Nisshin Oillio Group, Ltd.)

[0062] As shown in Table 2, by containing components corresponding to components (A) and (B) and manufacturing by a wet method or a W&D method including a slurry preparation step, sufficient evaluation results were obtained in terms of dispersibility, impact resistance, and usability (Examples 2 to 6). In particular, when a dimethicone swollen product of a (dimethicone / vinyl dimethicone) crosspolymer was used as component (B), particularly high dispersibility and usability were obtained (Examples 2 and 3). On the other hand, when dextrin palmitate, which is widely used as a gelling agent, was used instead of component (B), the results were insufficient in all respects of dispersibility, impact resistance, and usability (Comparative Example 4).

[0063] <Examples 7 to 8 and Comparative Examples 5 to 6> A powdered solid cosmetic product having the formula shown in Table 3 was prepared by the W&D method. Specifically, the powdered components, oily components, and other components shown in the formula in Table 3 were mixed, and then mixed with twice the amount of water of the mixture using a disper mixer, after which the mixture was crushed, pulverized, and dispersed using a media stirring mill (sand grinder mill) filled with zirconia beads of 2 mmφ. The resulting slurry was then dried in the form of fine droplets using a stirring dryer (spin flash dryer, manufactured by APV Nordic Anhyro) while blowing dry gas, to obtain a dry powder. The obtained dry powder was filled into a resin container and dry-pressed by a known method to obtain a solid powder cosmetic. The obtained solid cosmetic powder preparation was evaluated for the above items. The evaluation results are shown in Table 3.

[0064] [Table 3] *1 Satinia M5 (JGC Catalysts and Chemicals Co., Ltd.) *2 KSG-16 (Shin-Etsu Chemical Co., Ltd.) *6 Cosmoll 182V (Nisshin Oillio Group, Ltd.)

[0065] As shown in Table 3, when the blending amount of component (A) was too small, sufficient dispersibility and usability could not be achieved (Comparative Examples 5 and 6), but when component (A) was blended so as to be 6% by mass or more of the powder solid cosmetic preparation, excellent results were obtained in all evaluations (Examples 7 and 8). Also, it was confirmed that, compared to when the ratio of component (A) to the total powder was low (Example 7), when component (A) accounted for 10% by mass or more of the total powder (Example 8) a particularly high effect was obtained.

Claims

1. A method for producing a solid cosmetic product in powder form, comprising a slurry preparation step of mixing a powder component and an oily component as a binder in a volatile solvent to form a slurry, The powder component contains a spherical powder, and the spherical powder contains (A) a non-elastic spherical powder having a crushing strength per particle of 30 MPa or more, the oil component contains (B) a gel-like partially crosslinked organopolysiloxane polymer, The (A) non-elastic spherical powder accounts for 6 to 25% by mass of the solid cosmetic product in powder form, A method for producing a solid cosmetic product in powder form, wherein (A) non-elastic spherical powder accounts for 90% by mass or more of the spherical powder contained in the powder component.

2. 2. The method according to claim 1, wherein the non-elastic spherical powder (A) is selected from the group consisting of spherical silica, spherical alumina, spherical titania, and spherical calcium carbonate.

3. 3. The method according to claim 1 or 2, wherein the gel-like partially crosslinked organopolysiloxane polymer (B) is a dimethicone / vinyl dimethicone crosspolymer swollen with liquid silicone oil.

4. The method according to claim 3, wherein the liquid silicone oil is dimethicone.

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