Powdered cosmetics

Abstract

The purpose of the present invention is to provide a powdery solid cosmetic preparation which has excellent dispersibility of a powder and high impact resistance, while having usability equivalent to that in the cases where an elastic spherical powder is used.　A powdery solid cosmetic preparation according to the present invention is characterized by containing (A) a non-elastic spherical powder that has a crushing strength per one particle of 30 MPa or more, (B) from 1 to 15% by mass of iron oxide, (C) a partially crosslinked organopolysiloxane polymer in the form of a gel, and (D) a non-ionic surfactant that has an HLB of 10 or less; and this powdery solid cosmetic preparation is also characterized in that the non-elastic spherical powder (A) accounts for 90% by mass or more of all spherical powders contained in this cosmetic preparation.

Description

[Technical field]

[0001] The present invention relates to a solid cosmetic preparation in powder form. More specifically, the present invention relates to a solid cosmetic preparation in powder form that can achieve excellent usability even 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 solid cosmetic preparation in powder form that has excellent powder dispersibility and high impact resistance while having the same degree of usability as a cosmetic preparation containing an elastic spherical powder. [Means for solving the problem]

[0007] As a result of intensive research conducted by the present inventors in order to solve the above problems, they discovered that by combining a specific non-elastic spherical powder, iron oxide, a gel-like partially crosslinked organopolysiloxane polymer, and a nonionic surfactant with an HLB of 10 or less, it is possible to simultaneously achieve excellent usability, dispersibility, and impact resistance in a powder solid cosmetic product, and thus completed the present invention.

[0008] That is, the present invention provides (A) Inelastic spherical powder with a crushing strength of 30 MPa or more per particle, (B) 1 to 15 mass% of iron oxide, (C) a gel-like partially crosslinked organopolysiloxane polymer, and (D) Nonionic surfactants with an HLB value of 10 or less Including, (A) The gist of the present invention is a powder solid cosmetic in which non-elastic spherical powder accounts for 90% by mass or more of the total spherical powder contained in the cosmetic.

[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 (C), 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 (C) is used in combination with an elastic spherical powder, uneven filling such as dark and light colored areas may occur in the cosmetic, and impact resistance may be 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 (C) is used in combination with a non-elastic spherical powder.

[0010] However, it has been surprisingly discovered that 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 (C), and further adding (D) a nonionic surfactant with an HLB of 10 or less, the non-elastic spherical powder greatly improves the dispersibility of the powder containing iron oxide (B), thereby preventing the powder from agglomerating and achieving a smooth, spreadable texture without a dry feeling. Effect of the Invention

[0011] The present invention makes it possible to realize a solid cosmetic product in powder form that has sufficient usability without blending elastic spherical powder that has 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 solid cosmetic preparation in powder form of the present invention comprises (A) a non-elastic spherical powder, (B) iron oxide, (C) a gel-like partially crosslinked organopolysiloxane polymer, and (D) a nonionic surfactant. The details are explained 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 non-elastic spherical powder (A) 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 powder solid cosmetic. If the blending amount is less than 6% by mass, the usability is poor, the dispersibility of the powder is impaired, and aggregation may occur. Also, 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 viewpoints of moldability and impact resistance, it is preferable that the solid cosmetic preparation in powder form of the present invention does not contain 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) Iron oxide> The iron oxide (B) used in the present invention is pigment-grade iron oxide such as yellow iron oxide, red iron oxide, black iron oxide, etc., which are generally widely used in cosmetics, or these whose surfaces have been subjected to a hydrophobic treatment. The average particle size of the iron oxide (B) is preferably 100 to 500 nm, and particularly preferably 200 nm or more. (B) Specific examples of hydrophobic treatment agents used in the hydrophobic treatment of iron oxide include alkyl-modified silicone, alkyltriethoxysilane, alkyltrimethoxysilane, perfluoroalkyl phosphate, (alkyl acrylate / dimethyl silicone) copolymer, dextrin palmitate, triethoxysilylethyl polydimethylsiloxyethylhexyl dimethicone, monomethylpolysiloxane, dimethylpolysiloxane, polymeric silicone, sodium acryloyldimethyltaurate / methacrylamidolauric acid copolymer, and the like.

[0023] The blending amount of (B) iron oxide is 1 to 15% by mass, and more preferably 1 to 7% by mass, based on the entire powder solid cosmetic preparation. If it is less than 1% by mass, there is no problem with dispersibility, but sufficient cosmetic effect may not be obtained, and if it is blended in an amount of 15% by mass or more, dispersibility may be impaired and uneven filling may occur.

[0024] <(C) Gel-like partially cross-linked organopolysiloxane polymer> The component (C) 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.

[0025] Examples of the partially crosslinked organopolysiloxane polymer constituting the component (C) 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.

[0026] Specific examples of the liquid silicone oil, which is the solvent that constitutes component (C), include volatile cyclic silicone oils such as dimethicone, cyclopentasiloxane, and methyltrimethicone, as well as volatile linear silicone oils. Of these, dimethicone is particularly preferred.

[0027] The content of the partially crosslinked organopolysiloxane polymer in the component (C) is preferably from 10 to 30 mass %, and more preferably from 15 to 25 mass %.

[0028] The component (C) 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.).

[0029] The blending amount of component (C) is 1 to 15% by mass, preferably 2 to 10% by mass, and more preferably 3 to 7% by mass, based on the total mass 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.

[0030] (D) Nonionic surfactants with an HLB value of 10 or less Component (D) is a nonionic surfactant with an HLB value of 10 or less. HLB is determined by the following formula: HLB = 7 + 11.7 log(MW / MO) (where MW represents the molecular weight of the hydrophilic base, and MO represents the molecular weight of the lipophilic base) It is calculated by the Kawakami formula represented by the following formula. If the HLB exceeds 10, it becomes difficult to uniformly disperse the powder. The HLB is preferably in the range of 2 to 10, and more preferably in the range of 3 to 6.

[0031] The nonionic surfactant having an HLB of 10 or less is not particularly limited as long as it is one that is normally used in cosmetics, and examples thereof include 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) sorbitol hexastearate, POE (3) castor oil, PEG (2) monostearate, ethylene glycol monostearate, PEG (2) stearate, and the like. In the cosmetic preparation according to the present invention, these nonionic surfactants can be blended alone or in combination of two or more kinds. (D) Commercially available nonionic surfactants include Cosmol 182V (sorbitan sesquiisostearate; Nisshin Oillio Group, Ltd.) and Nikkol SS-10V (sorbitan monostearate).

[0032] The blending amount of the nonionic surfactant (D) is 0.01 to 5% by mass, preferably 0.1 to 1% by mass, based on the total amount of the solid cosmetic preparation in powder form of the present invention. If the blending amount is less than 0.01% by mass, it may be difficult to achieve sufficient dispersibility, and if the blending amount is more than 5% by mass, stickiness may occur during use.

[0033] <Optional ingredients> In addition to the above components (A) to (D), the cosmetic of the present invention may contain components that are typically used in cosmetics, provided that the effects of the present invention are not impaired. For example, powder components, oily components, UV protection agents, and the like other than those mentioned above may be appropriately blended as necessary.

[0034] 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, phlogopite, synthetic mica, synthetic fluorine phlogopite, red mica, biotite, calcined talc, calcined sericite, calcined muscovite, calcined phlogopite, 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 acid, hydroxyapatite ... titanium dioxide (titanium dioxide sintered with iron oxide), 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 titanate, etc.); inorganic yellow pigments (e.g., yellow ochre, etc.); inorganic black pigments (e.g., 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.);

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Examples of the hydrocarbon oil include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0039] 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).

[0040] 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.

[0041] 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.

[0042] 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.

[0043] As the ultraviolet protection agent (ultraviolet absorbing agent and / or ultraviolet scattering agent), those usually incorporated in cosmetics can be used.

[0044] 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.

[0045] The ultraviolet scattering agent is not particularly limited, but specific examples include fine particle metal oxides such as zinc oxide, titanium 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.

[0046] 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.

[0047] 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.

[0048] <Manufacturing method> The method for producing the solid cosmetic in powder form of the present invention is not particularly limited, and known methods can be used. For example, the "dry method" of mixing a powder component and an oily component without using a solvent, filling a container with the mixture, and molding the mixture; the "wet method" of adding a powder component and an oily component to a volatile dispersion medium to form a slurry, filling a container in the slurry state, and solidifying the mixture by removing the solvent; and a method of forming the slurry into fine droplets by mechanical shearing force, blowing dry gas into the fine droplets to dry them, and performing normal dry molding on the resulting dried powder (hereinafter, for convenience, this method may be referred to as the "W&D method" in this document). Details of the W&D method are described, for example, in JP-A-2007-55990. The W&D method is expected to further improve usability, such as the ability to be applied to a puff, smoothness, and fit.

[0049] The solvent used in preparing the slurry in the wet method or W&D method 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 blended components used.

[0050] 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

[0051] 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.

[0052] <Dispersibility> The presence or absence of aggregation in the prepared powder solid cosmetic preparations was visually confirmed. A: No aggregation was observed. B: Slight aggregation was observed. C: The aggregation was so severe that it was unsuitable for use.

[0053] <Impact resistance> The powdered solid cosmetic product was placed in a compact cosmetic 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.

[0054] <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 usability was good. C: Fewer than 5 out of 10 panelists answered that it was easy to use.

[0055] <Example 1 and Comparative Examples 1 to 3> The solid cosmetic powder preparations of Example 1 and Comparative Examples 1 to 3 shown in Table 1 below were prepared by a dry method. Specifically, the powder component, oil component, 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 the solid cosmetic powder preparations.

[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.) *3 Cosmoll 182V (Nisshin Oillio Group, Ltd.)

[0058] As shown in Table 1, even when (B) iron oxide was blended and a high content of a component corresponding to (A) non-elastic spherical powder was blended, when a component corresponding to (C) a gel-like partially crosslinked organopolysiloxane polymer and a component corresponding to (D) a nonionic surfactant were included, sufficient evaluation results were obtained in terms of dispersibility, impact resistance, and usability (Example 1). On the other hand, when any of (A) to (D) was absent, low evaluation results were shown in each item (Comparative Examples 1 to 3). In particular, when the component corresponding to the non-elastic spherical powder (A) was not included, the dispersibility was insufficient (Comparative Example 3), confirming that the component (A) also contributes to dispersibility.

[0059] <Examples 2 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.

[0060] [Table 2] *1 Satinia M5 (JGC Catalysts and Chemicals Co., Ltd.) *2 KSG-16 (Shin-Etsu Chemical Co., Ltd.) *3 Cosmoll 182V (Nisshin Oillio Group, Ltd.) *4 KSG-18A (Shin-Etsu Chemical Co., Ltd.) *5 KSG-210 (Shin-Etsu Chemical Co., Ltd.) *6 KSG-360Z (Shin-Etsu Chemical Co., Ltd.)

[0061] As shown in Table 2, when all of the components corresponding to (A) to (D) were included, 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 the component (C), particularly high dispersibility and usability were obtained (Example 2). In addition, it was confirmed that a particularly high effect was obtained when the component (A) accounted for 10% by mass or more of the total powder (Example 2), compared with when the ratio of the component (A) to the total powder was low (Example 6). On the other hand, when dextrin palmitate, which is widely used as a gelling agent, was used instead of component (C), the results were insufficient in all respects of dispersibility, impact resistance, and usability (Comparative Example 4).

Claims

1. (A) a non-elastic spherical powder having a crushing strength per particle of 30 MPa or more; (B) 1 to 15 mass % of iron oxide; (C) a gel-like partially crosslinked organopolysiloxane polymer, and (D) A nonionic surfactant having an HLB of 10 or less. Including, (A) A solid powder cosmetic preparation in which non-elastic spherical powder accounts for 90% by mass or more of the total spherical powder contained in the cosmetic preparation.

2. 2. The solid cosmetic preparation in powder form 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 solid cosmetic preparation in powder form according to claim 1 or 2, wherein (C) the gel-like partially crosslinked organopolysiloxane polymer is a (dimethicone / vinyl dimethicone) crosspolymer swollen with liquid silicone oil.

4. 4. The solid cosmetic preparation in powder form according to claim 3, wherein the liquid silicone oil is dimethicone.

5. 5. The solid cosmetic preparation in powder form according to claim 1, wherein the amount of (D) a nonionic surfactant having an HLB of 10 or less is 0.01 to 5 mass % of the total amount of the cosmetic preparation.

Images