Water-in-oil type emulsified solid cosmetic

Abstract

The purpose of the present invention is to provide a water-in-oil type emulsified solid cosmetic which has a moist feeling of use, has an excellent feeling of adhesion to the skin, and is suitable for application on top. A water-in-oil type emulsion solid cosmetic according to the present invention is characterized by containing (A) a wax, (B) agar, and (C) a trimethylsiloxysilicate ester, the blending ratio ((A) / (B)) of the component (A) to the component (B) being 4-150 by mass ratio, and the blending ratio ((C) / (B)) of the component (C) to the component (B) being 0.3-30 by mass ratio.

Description

Technical Field

[0001] The present invention relates to a water-in-oil emulsified solid cosmetic having excellent water moisturizing property, long-lasting makeup property, and suitability for layering application. Background Art

[0002] Compared with water-in-oil emulsified solid cosmetics, water-in-oil emulsified solid cosmetics have the advantages of excellent water resistance and good fitting feeling (tight adhesion to the skin), but lack a refreshing feeling and sometimes cause a sticky and greasy feeling during use. In addition, for conventional water-in-oil emulsified solid cosmetics, especially makeup cosmetics, powders such as hydrophobically treated pigments incorporated in the oil phase sometimes adsorb onto waxes and cause aggregation, resulting in problems such as increased heaviness of spreading during application, reduced water moisturizing feeling, and a powdery feeling during use due to the aggregates.

[0003] Therefore, a water-in-oil emulsified solid cosmetic has been proposed, which improves the reduced feeling during use caused by aggregates of powder components and waxes by dispersing powders in the inner aqueous phase. For example, Patent Document 1 discloses that for a water-in-oil emulsified solid cosmetic in which the outer oil phase is thickened or solidified with wax and / or a gelling agent, powders containing hydrophilic titanium dioxide are dispersed in the inner aqueous phase by using a cationic dispersant and / or an amphoteric dispersant, thereby obtaining a cosmetic having a smooth and water-moisturizing feeling during application and excellent stability even at high temperatures. However, although the solid cosmetic of Patent Document 1 can suppress the above-mentioned aggregates and improve the feeling during use, there is a problem that it is desired to further impart a water-moisturizing feeling during use.

[0004] On the other hand, as described in Patent Document 2, for example, it is known that in a water-in-oil emulsified solid cosmetic, a water-moisturizing feeling can be imparted by incorporating sulfur-containing polysaccharides such as agar and carrageenan in the aqueous phase.

[0005] However, if polysaccharides described in Patent Document 2 are incorporated in the inner aqueous phase of a water-in-oil emulsified solid cosmetic for the purpose of improving the water-moisturizing feeling during use, there is a problem of reduced fitting feeling peculiar to water-in-oil emulsified solid cosmetics. In addition, due to the polysaccharides incorporated in the inner aqueous phase, there are problems such as a sticky feeling during application or makeup removal during layering application. Further, when the amount of agar exceeds a certain level, there is also a problem that sufficient solidification cannot be achieved.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: JP-T-2020 / 067420

[0009] Patent Document 2: JP-A-2023-088747 Summary of the Invention

[0010] Problems to be Solved by the Invention

[0011] An object of the present invention is to provide a water-in-oil emulsified solid cosmetic, which has a moist feeling during use, excellent adhesion to the skin, and is suitable for layering application.

[0012] The inventors conducted intensive studies repeatedly to solve the above problems, and as a result, found that by using agar to thicken / gel the internal aqueous phase and incorporating trimethylsiloxysilicate in the oil phase, it is possible to solve the problem of the feeling during use that occurs when a polysaccharide is incorporated in the internal aqueous phase of a water-in-oil emulsified solid cosmetic, thereby completing the present invention.

[0013] That is, the present invention provides a water-in-oil emulsified solid cosmetic, which comprises:

[0014] (A) wax,

[0015] (B) agar, and

[0016] (C) trimethylsiloxysilicate,

[0017] The mixing ratio ((A) / (B)) of the above-mentioned component (A) to the above-mentioned component (B) is 4 to 150 by mass ratio,

[0018] The mixing ratio ((C) / (B)) of the above-mentioned component (C) to the above-mentioned component (B) is 0.3 to 30 by mass ratio.

[0019] Effects of the Invention

[0020] By adopting the above constitution, the present invention can be sufficiently solidified even in the case of containing (B) agar, dissolve the aqueous component gelated by agar on the skin, thereby reducing the powdery feeling, and can feel the light feeling of extension (the degree of easy spreading), and can give the cosmetic a moist feeling during use in which the aqueous component oozes out by application, and improve the adhesion peculiar to the water-in-oil emulsified cosmetic. In addition, a water-in-oil emulsified solid cosmetic can be obtained, which can suppress the problem of stickiness during application when agar is incorporated in the internal phase, and does not cause makeup removal even when used in layers. Detailed Description of the Invention

[0021] The cosmetic of the present invention is characterized by containing (A) wax, (B) agar, and (C) trimethylsiloxysilicate in specific mixing ratios. Hereinafter, each component constituting the cosmetic of the present invention will be described in detail.

[0022] <(A) wax>

[0023] The wax (A) of the present invention (hereinafter sometimes simply referred to as the "(A) component") can be selected from the waxes that can be conventionally used in cosmetics. As examples, there can be mentioned: oils that are solid at normal temperature (25 °C) such as natural and synthetic fats and oils, hydrocarbon oils, waxes, higher fatty acids, higher alcohols, and ester oils.

[0024] As specific examples, there can be mentioned: solid fats and oils such as cocoa seed butter, horse fat, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated castor oil, hydrogenated vegetable oil, etc.; hydrocarbon oils such as polyethylene wax, microcrystalline wax (branched saturated hydrocarbon), paraffin wax (straight-chain hydrocarbon), ozokerite, pure ozokerite, wood wax, lignite wax, Fischer-Tropsch wax, etc.; waxes such as beeswax, lanolin, carnauba wax, candelilla wax, rice bran wax (rice wax), spermaceti, bran wax, lignite wax, sugarcane wax, isopropyl lanolate, reduced lanolin, hard lanolin, POE lanolin alcohol ether, POE cholesteryl ether, etc.; higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, 12-hydroxystearic acid, etc.; higher alcohols such as straight-chain alcohols (e.g., isocetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, cetostearyl alcohol, etc.) and branched-chain alcohols (e.g., monostearyl glycerol ether (batyl alcohol)); ester oils such as myristyl myristate, stearyl stearate, cetyl stearate, cetyl palmitate, cholesteryl stearate, cholesteryl oleate, dextrin palmitate, stearoyl inulin, hydrogenated jojoba oil, etc. One or more of them can be used in combination. Among them, polyethylene wax, microcrystalline wax (branched saturated hydrocarbon), and paraffin wax (straight-chain hydrocarbon) are preferably used.

[0025] As the wax (A) of the present invention, commercially available products of composite waxes composed of a mixture of multiple waxes can be used. As commercially available products of such composite waxes, for example, there can be mentioned: PA wax (a mixed wax of polyethylene wax and microcrystalline wax), PARMIC 160 (a mixed wax of microcrystalline wax and paraffin wax) (both are manufactured by Nikko Rica Corporation), etc.

[0026] <(B) Agar>

[0027] Regarding the agar (B) of the present invention (hereinafter sometimes simply referred to as the "(B) component"), there is no particular limitation as long as it is agar that can be conventionally used in cosmetics and has a high gelling power with agarose as the main component.

[0028] As the agar (B) of the present invention, either natural products or commercially available products can be used. As commercially available products, for example, Ina agar PS-84, Z-10, AX-30, AX-100, AX-200, T-1, S-5, M-7 (manufactured by Ina Food Industry Co., Ltd.) etc. can be suitably used. In addition, purified agarose can also be used as the (B) agar.

[0029] <(C) Trimethylsilanoxysilicate>

[0030] Regarding the (C) trimethylsiloxysilicate of the present invention (hereinafter sometimes simply referred to as the "(C) component"), there is no particular limitation as long as it is a substance commonly used as an oil-soluble film-forming agent in cosmetics. As the trimethylsiloxysilicate that can be used in the cosmetics of the present invention, a trimethylsiloxysilicate having a weight-average molecular weight of 10,000 or more can be cited. It should be noted that the weight-average molecular weight is a polystyrene conversion value obtained based on gel permeation chromatography (GPC).

[0031] Such a trimethylsiloxysilicate can be a substance produced by a known production method.

[0032] As commercially available products of (C) trimethylsiloxysilicate, for example, X-21-5250 (50% decamethylcyclopentasiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), X-21-5250L (50% polydimethylsiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), X-21-5616 (60% isododecane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), X-21-5249 (50% decamethylcyclopentasiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), X-21-5249L (50% polydimethylsiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), KF-7312 (50% decamethylcyclopentasiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), KF-7312K (60% polydimethylsiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), KF-7312L (50% polydimethylsiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), KF-7312T (60% methylpolymethyltrimethoxysilane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), X-21-5595 (60% isododecane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), KF-9021 (50% decamethylcyclopentasiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), KF-9021L (50% polydimethylsiloxane solution, manufactured by Shin-Etsu Chemical Co., Ltd.), MQ-1600 Solid Resin (100% pure, manufactured by Dow Toray Co., Ltd.), Wacker-Belsil TMS803 (100% pure, manufactured by Wacker Asahikasei Silicone co., ltd.), etc. can be cited.

[0033] Regarding the blending amounts of the aforementioned (A), (B), and (C) components in the cosmetics of the present invention, the blending mass ratio of the (A) component to the (B) component ((A) / (B)) is 4 to 150, and the blending mass ratio of the (C) component to the (B) component ((C) / (B)) is 0.3 to 30. By setting the blending amounts of the (A), (B), and (C) components of the present invention to the aforementioned ratios, an oil-in-water type emulsified solid cosmetic having excellent usability can be obtained.

[0034] In the cosmetic of the present invention, the compounding mass ratio of component (A) to component (B) ((A) / (B)) is 4 to 150, preferably 5 to 145, and more preferably 7 to 140. When the compounding amount of (B) agar is excessive relative to the compounding amount of (A) wax, specifically when the (A) / (B) compounding mass ratio is less than 4, the preparation cannot be sufficiently solidified.

[0035] In the cosmetic of the present invention, the compounding mass ratio of component (C) to component (B) ((C) / (B)) is 0.3 to 30, preferably 0.4 to 25 or 0.5 to 22, and more preferably 2 to 21 or 3 to 20. When the compounding amount of (C) trimethylsiloxysilicate is too small relative to the compounding amount of (B) agar, specifically when the (C) / (B) compounding mass ratio is less than 0.3, stickiness occurs when applied to the skin, the usability deteriorates, and makeup smudging occurs when applying makeup repeatedly, making it unsuitable for repeated application.

[0036] Generally, the compounding amount of component (A) in the cosmetic of the present invention is the amount used to solidify the external oil phase in the water-in-oil emulsified solid cosmetic, and is not particularly limited. As an example, it is preferably 0.1 to 15% by mass, more preferably 0.5 to 10% by mass, and further preferably 1 to 7% by mass relative to the total amount of the cosmetic.

[0037] The compounding amount of component (C) in the cosmetic of the present invention is not particularly limited as long as it satisfies the aforementioned compounding ratio ((C) / (B)). As examples, the lower limit values of the compounding amount relative to the total amount of the cosmetic can be 0.15% by mass, 0.2% by mass, 0.25% by mass, and the upper limit values can be 20% by mass, 15% by mass, 12% by mass, 10% by mass.

[0038] The compounding amount of component (B) in the cosmetic of the present invention is not particularly limited as long as it satisfies the aforementioned compounding ratio ((A) / (B)). As examples, the lower limit values of the compounding amount relative to the total amount of the cosmetic can be 0.03% by mass, 0.04% by mass, 0.05% by mass, and the upper limit values can be 1.8% by mass, 1.5% by mass, 1.2% by mass, 1.0% by mass.

[0039] The water-in-oil emulsified solid cosmetic of the present invention may further contain (D) a pigment having a hydrophobic surface.

[0040] The (D) component, which is a pigment with a hydrophobic surface in the present invention (hereinafter sometimes simply referred to as the "(D) component"), refers to a pigment that is conventionally used in the cosmetic field and has a hydrophobic surface on the powder body. For the (D) component of the present invention, if the surface of the powder itself is hydrophobic, it can be an untreated substance, and in the case where the surface of the powder is hydrophilic, a hydrophobization treatment is required. Examples of the pigment as the (D) component include inorganic pigments, organic pigments, and lake pigments, etc.

[0041] Examples of inorganic pigments include: extender pigments and other inorganic powders (such as talc, kaolin, sericite, muscovite, synthetic mica, synthetic phlogopite, phlogopite, red mica, biotite, lepidolite, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, strontium silicate, metal tungstate, silica, hydroxyapatite, zeolite, boron nitride, ceramic powder, etc.); hydrophilic colorants, such as inorganic white pigments (such as pigment-grade titanium dioxide, pigment-grade zinc oxide, etc.); inorganic red pigments (such as iron titanate, etc.); inorganic purple pigments (such as manganese violet, cobalt violet, etc.); inorganic green pigments (such as chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (such as ultramarine, Prussian blue, etc.); pearlescent pigments (such as mica coated with titanium dioxide, bismuth oxychloride coated with titanium dioxide, talc coated with titanium dioxide, mica coated with colored titanium dioxide, bismuth oxychloride, fish scale foil, etc.); iron oxide red (iron oxide red), iron oxide yellow, iron oxide black, carbon black; metal powder pigments (such as aluminum powder, copper powder, etc.), etc.

[0042] Examples of organic pigments include: 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, and Blue No. 404, etc.

[0043] Examples of lake pigments include: zirconium, barium or aluminum lakes such as 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.

[0044] As the (D) component of the present invention, one or more than two selected from the above pigments can be used. Among them, as the pigments of the present invention, pigment-grade iron oxides such as iron oxide yellow, iron oxide red, and iron oxide black, pigment-grade titanium dioxide, etc. are preferably used. Here, pigment-grade means that the average particle size is 100 nm to 1 μm. The average particle size of this pigment can be measured by a transmission electron microscope or a laser scattering / diffraction method, etc.

[0045] As a method for hydrophobic treatment of the surface of pigments, examples include: silica treatment using silica, hydrated silica, etc.; dextrin alkyl ester treatment using dextrin palmitate, etc.; distearyldimethylammonium chloride treatment; silicone treatment using methylhydrogenpolysiloxane, methylpolysiloxane, etc.; fluorine treatment using perfluoroalkyl phosphate, perfluoroalcohol, etc.; amino acid treatment using N-acylglutamic acid, etc.; lecithin treatment; metal soap treatment such as aluminum stearate treatment, magnesium isostearate treatment, etc.; fatty acid treatment; inorganic compound treatment; alkyl phosphate ester treatment, etc. These hydrophobic treatments can be carried out according to conventional methods.

[0046] In the cosmetic of the present invention, (D) pigments with a hydrophobic surface are dispersed in the external oil phase.

[0047] (D) component is an optional component. Therefore, for the purpose of obtaining the desired color of the skin, as long as it is a conventional blending amount used in cosmetics, there is no particular limitation. As an example of the total blending amount of pigments, it is 0.1% by mass or more relative to the total amount of the cosmetic, for example, 1 to 20% by mass, preferably 2 to 15% by mass.

[0048] In the present invention, for the purpose of uniformly dispersing powder components such as pigments in the oil phase, (E) dispersant can be blended. The "dispersant" in this specification refers to a substance that can adsorb on the surface of the powder component and inhibit the aggregation of the powder component, and make it uniformly disperse in the oily medium. The (E) dispersant (hereinafter sometimes simply referred to as "(E) component") used in the cosmetic of the present invention is not particularly limited as long as it is a substance commonly used as a dispersant in cosmetics, and a lipophilic (HLB = 7 or less) substance is preferred.

[0049] As specific examples, silicone-based dispersants such as polyglycerol-3 polydimethylsiloxyl hydroxyethyl polydimethylsiloxane, bis-butyl polydimethylsiloxane polyglycerol-3, lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane, etc.; sorbitan fatty acid ester-based dispersants such as sorbitan sesquiisostearate, sorbitan laurate, sorbitan palmitate, sorbitan oleate, sorbitan stearate, sorbitan isostearate, sorbitan sesquioleate, sorbitan trioleate, sorbitan tristearate, etc.; polyglycerol fatty acid ester-based dispersants such as polyglycerol-5 triisostearate, polyglycerol pentaisostearate, polyglycerol-10 pentaisostearate, polyglycerol condensed ricinoleate, polyglycerol-6 polyricinoleate, etc.; glycerol fatty acid ester-based dispersants such as glycerol monostearate, glycerol monooleate, glycerol isostearate, diglycerol diisostearate, decaglycerol pentaisostearate, etc. can be used, and one or more than two selected from them can be used. Among them, sorbitan sesquiisostearate and sorbitan sesquioleate selected from them are preferred.

[0050] (E) The compounding amount can be appropriately adjusted according to the type and amount of the compounded powder and / or the amount of the oil phase component, etc., and there is no particular limitation as long as it is a compounding amount commonly used in cosmetics for the purpose of dispersing the powder, etc. As an example of the compounding amount, it is preferably 0.5 to 6% by mass, more preferably 2 to 4% by mass, based on the total amount of the cosmetics.

[0051] In the present invention, an emulsifier used when emulsifying the above internal aqueous phase into an external oil phase can be compounded. For the emulsifier used in the cosmetics of the present invention, there is no particular limitation as long as it is an emulsifier that can be commonly compounded into a water-in-oil type emulsifying composition, and it refers to a lipophilic (HLB = 7 or less) emulsifier other than the above (E) dispersant.

[0052] As specific examples, there can be mentioned: polyoxyethylene hydrogenated castor oils such as POE(5), POE(7.5), POE(10) hydrogenated castor oil; dimeric hydroxystearate esters: high molecular weight lipophilic active agents such as polyglycerol-2 dimeric hydroxystearate (manufactured by Cognis Japan Co., Ltd.: PGPH), PEG30 dimeric hydroxystearate (manufactured by Uniqema Co., Ltd.: Arlacel P135); polyether-based silicones such as cetyl PEG / PPG-10 / 1 polydimethylsiloxane (e.g., "ABIL EM90" (manufactured by Goldschmidt Co., Ltd.)), polyether-modified silicone (e.g., PEG-10 polydimethylsiloxane; "KF6017" (manufactured by Shin-Etsu Chemical Co., Ltd.)), crosslinked polyether-modified silicone (e.g., "KSG" series (manufactured by Shin-Etsu Chemical Co., Ltd.)); polyglycerol-based silicones such as polyglycerol-modified silicone, alkyl co-modified polyglycerol-modified silicone, etc. The present invention can use one or more selected from the above emulsifiers having an HLB of 7 or less. The present invention preferably uses silicone-based emulsifiers such as polyether-modified silicone.

[0053] The compounding amount of the emulsifier can be appropriately adjusted according to the type and amount of the oil phase component and the water phase component, etc., and there is no particular limitation as long as it is a compounding amount commonly used in water-in-oil type emulsifying solid cosmetics. As an example of the compounding amount, it is preferably 0.5 to 7% by mass, more preferably 2 to 5% by mass, based on the total amount of the cosmetics.

[0054] The internal aqueous phase thickened / gelled with (B) agar of the present invention can be water or a mixture of water and an aqueous solvent such as a lower alcohol.

[0055] In the internal aqueous phase, in addition to (B) agar and water or an aqueous solvent, any components such as a humectant, a stabilizer, various water-soluble medicaments, a hydrophilic powder, a water-soluble thickener, etc. can be appropriately compounded.

[0056] As humectants, examples include: 1,3 - butanediol, polyethylene glycol, 1,2 - propanediol, dipropylene glycol (abbreviated as DPG), hexylene glycol, glycerin, diglycerin, xylitol, maltitol, maltose, D - mannitol, trehalose, erythritol, 1,3 - propanediol, glucose, polyoxyethylene methyl glucoside, etc.

[0057] The stabilizer includes chelating agents, masking agents, preservatives, antioxidants, etc.

[0058] As water - soluble agents, examples include: vitamins such as vitamin A, retinol, retinol palmitate, inositol, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, DL - α - tocopherol nicotinate, magnesium ascorbyl phosphate, ascorbic acid 2 - glucoside, vitamin D2 (ergocalciferol), potassium salt of dl - α - tocopherol 2 - L - ascorbic acid phosphate diester, dl - α - tocopherol, dl - α - tocopherol acetate, pantothenic acid, biotin, etc.; anti - inflammatory agents such as allantoin, azulene, glycyrrhetinic acid, etc.; whitening agents such as arbutin, tranexamic acid, potassium 4 - methoxysalicylate, etc.; astringents such as zinc oxide, tannic acid, etc.; sulfur, lysozyme, γ - oryzanol, etc.

[0059] The blending amount of the aqueous phase (the total of water or organic solvents and components mixed in the aqueous solvent) in the water - in - oil emulsified solid cosmetic of the present invention is generally 1 to 45% by mass, preferably 5 to 40% by mass, and more preferably 10 to 35% by mass.

[0060] The outer oil phase of the water - in - oil emulsified solid cosmetic of the present invention contains: a liquid oil component thickened or solidified with (A) wax. The liquid oil component in the present invention refers to an oil component that is liquid at normal temperature (25°C) and can be conventionally used in cosmetics and pharmaceuticals.

[0061] Examples of the liquid oil component used in the present invention include: liquid oils such as avocado oil, camellia oil, macadamia integrifolia seed oil, mink oil, olive fruit oil, castor oil, jojoba oil, triglycerin, and glyceryl trioctanoate; hydrocarbons such as liquid paraffin, squalane, and squalene; higher fatty acids such as oleic acid, isostearic acid, linoleic acid, and linolenic acid; higher alcohols such as lauryl alcohol, oleyl alcohol, batyl alcohol, glyceryl monopalmityl ether, cholesterol, phytosterol, and isostearyl alcohol; ester oils such as isononyl isononanoate, isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, butyl stearate, decyl oleate, ethylene glycol dicaprylate, diisostearyl malate, trimethylolpropane tris(ethylhexanoate), trimethylolpropane triisostearate, pentaerythritol tetra(ethylhexanoate), glyceryl tri(ethylhexanoate), glyceryl triisostearate, ethyl acetate, butyl acetate, and amyl acetate; linear silicones such as polydimethylsiloxane, diphenylsilanoxy phenyl trimethylsiloxane, hydrogenated polydimethylsiloxane, dodecamethylpentasiloxane, and decamethyltetrasiloxane; cyclic silicones such as decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and octamethylcyclotetrasiloxane. One or more of them can be used in combination. In the present invention, it is preferable to blend linear silicones such as polydimethylsiloxane and diphenylsilanoxy phenyl trimethylsiloxane as the main components of the liquid oil component.

[0062] In the external oil phase of the cosmetic of the present invention, a hydrophobic powder other than the pigment having a hydrophobic surface described in the foregoing (D) can be blended. The hydrophobic powder in this specification refers to a powder obtained by subjecting a extender pigment to surface hydrophobization treatment with silicone, fluorine, Teflon (registered trademark), fatty acid, fatty acid soap, lauroyl lysine, etc.; a powder having a hydrophobic surface originally, such as an organosilicon resin powder, which corresponds to the powder component blended in the external oil phase in a conventional water-in-oil emulsified solid cosmetic. Spherical powders such as organosilicon resin powder that can improve the usability of the cosmetic can be blended in the external oil phase.

[0063] In addition to the above-mentioned liquid oil component and hydrophobic powder, natural or synthetic solid oil components and semi-solid oil components (excluding the above-mentioned (A) wax), oil-soluble ultraviolet absorbers, fat-soluble vitamins, edible flavors, etc. can be blended in the external oil phase. Here, the semi-solid oil component refers to an oil component that does not show fluidity at normal temperature (25°C) and has a melting point of 30 to 60°C, preferably 30 to 45°C, at 1 atmospheric pressure.

[0064] Examples of the ultraviolet absorber include: benzoic acid-based ultraviolet absorbers such as diethylamino hydroxybenzoyl benzoic acid hexyl ester; salicylic acid-based ultraviolet absorbers such as homosalate and ethylhexyl salicylate; cinnamic acid-based ultraviolet absorbers such as ethylhexyl methoxycinnamate, isopropyl p-methoxycinnamate, octyl p-methoxycinnamate, and glycerol mono-2-ethylhexanoate di-p-methoxycinnamate; dibenzoylmethane-based ultraviolet absorbers such as 4-tert-butyl-4'-methoxydibenzoylmethane; β,β-diphenylacrylate-based ultraviolet absorbers such as octocrylene; benzophenone-based ultraviolet absorbers such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, and benzophenone-3; benzylidene camphor-based ultraviolet absorbers such as benzylidene camphor sulfonic acid, 3-(4'-methylbenzylidene)-d,l-camphor, and 3-benzylidene-d,1-camphor; phenylbenzimidazole-based ultraviolet absorbers such as phenylbenzimidazole sulfonic acid; triazine-based ultraviolet absorbers such as bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyl triazone; phenylbenzotriazole-based ultraviolet absorbers such as cresol triazole trisiloxane, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, and methylene bis-benzotriazolyl tetramethylbutylphenol; anthranilic acid-based ultraviolet absorbers such as methyl anthranilate; imidazoline-based ultraviolet absorbers such as ethylhexyl dimethoxymethylenedioxy imidazolidine propionate; benzylidene malonate-based ultraviolet absorbers such as benzylidene malonate polysiloxane and polysiloxane-15; 4,4-diarylbutadiene-based ultraviolet absorbers such as 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene, etc.

[0065] In addition to the above components, the water-in-oil emulsified solid cosmetic of the present invention may further contain any other components that can be incorporated into cosmetics within the range that does not impair the effects of the present invention, in the inner aqueous phase or the outer oil phase.

[0066] The cosmetic of the present invention can be manufactured according to the method commonly used for water-in-oil emulsified solid cosmetics. Briefly, it can be manufactured through the following steps.

[0067] (1) Water, an aqueous solvent, a water-soluble thickener, and any other components are mixed while heating as needed, and then powders, etc. are appropriately added, and stirred and mixed with a homogenizer, etc. to prepare an aqueous phase component.

[0068] (2) Wax, a liquid oil component, and any other components are mixed while heating as needed, and then a hydrophobic powder, etc. is added, and stirred and mixed with a homogenizer, etc. to prepare an oil phase component.

[0069] (3) An emulsifier is arbitrarily added to the oil phase component, the aqueous phase component is added, and stirred and mixed with a homogenizer, etc. to form an emulsion.

[0070] (4) Fill the aforementioned emulsion into a container and allow it to cool and solidify, thereby obtaining the water-in-oil emulsion solid cosmetic of the present invention.

[0071] The water-in-oil emulsion solid cosmetic of the present invention is suitable to be provided in the form of color cosmetic products such as foundation, concealer, eyeshadow, eyeliner, mascara, and blush; or makeup base and sunscreen. As the form, it can be made into a stick shape or a powder compact shape. In addition, the water-in-oil emulsion solid cosmetic of the present invention can also be used in the form of a cushion foundation impregnated in a water-insoluble sponge, a foamed foam carrier, etc.

[0072] Examples

[0073] Hereinafter, examples are given to further illustrate the present invention in detail, but the present invention is not limited thereto at all. Unless otherwise stated, the blending amount represents mass% relative to the system containing the component. Before specifically describing each example, the evaluation method used is described.

[0074] 1. Practical use test

[0075] Using a puff-shaped application tool, apply 0.2 g of the sample of each example to the entire face of the professional evaluation panel members, and evaluate the feel during application (moist feeling, light feeling of spreading (degree of easy spreading), stickiness) and whether the makeup fades after 4 hours (adhesion) according to the following criteria.

[0076] A: 8 - 10 out of 10 people answered that it is moist, spreads well, has adhesion, and is not sticky.

[0077] B: 5 - 7 out of 10 people answered that it is moist, spreads well, has adhesion, and is not sticky.

[0078] C: 2 - 4 out of 10 people answered that it is moist, spreads well, has adhesion, and is not sticky.

[0079] D: 0 - 1 out of 10 people answered that it is moist, spreads well, has adhesion, and is not sticky.

[0080] 2. Degree of easy layering application

[0081] Using a puff-shaped application tool, apply 0.2 g of the specimen of each example to the entire face of the professional evaluation panel members, then pick up an additional 0.2 g of the specimen on the application tool and apply it again to the entire face, and observe whether the makeup film completed for the first time peels off. Evaluate the observation results according to the following criteria.

[0082] A: 8 - 10 out of 10 people answered that the makeup films on the cheeks, nose, and mouth corners did not peel off.

[0083] B: Among 10 people, 5 to 7 people replied that the makeup films on the cheeks, nose, and around the mouth did not come off.

[0084] C: Among 10 people, 2 to 4 people replied that the makeup films on the cheeks, nose, and around the mouth did not come off.

[0085] D: Among 10 people, 0 to 1 person replied that the makeup films on the cheeks, nose, and around the mouth did not come off.

[0086] 3. Evaluation of formability

[0087] Prepare the cosmetics of each formulation, then fill them into a wide-mouth container and observe whether they solidify. In the table, mark those that solidify as "OK" and those that do not solidify as "NG".

[0088] Prepare a water-in-oil emulsified solid cosmetic (foundation) having the composition shown in Table 1 below. Specifically, heat and mix the oily components, then add the powder components to obtain a uniformly dispersed oily component mixture (oil phase), add the separately mixed and dissolved aqueous component mixture (water phase) to the aforementioned oily component mixture, emulsify with a homogenizer, etc., and fill the obtained emulsion into a wide-mouth container and slowly cool it to prepare a water-in-oil emulsified solid cosmetic. For the prepared specimens, evaluate each characteristic according to the aforementioned evaluation method. The results are shown in the table together.

[0089] [Table 1]

[0090]

[0091] *1: PARMIC 160 (a mixed wax of 7 parts microcrystalline wax and 93 parts paraffin wax, manufactured by Nikko Rica Corporation)

[0092] *2: PA wax (a mixed wax of polyethylene wax and microcrystalline wax, manufactured by Nikko Rica Corporation)

[0093] Comparative Example 1 described in the table is an example of a conventional water-in-oil emulsified solid cosmetic. When (B) agar is incorporated into the water phase of the cosmetic of Comparative Example 1, as the incorporation amount increases, the sense of moisture, the lightness of extension, and the fitting feeling improve, but it becomes sticky and makeup comes off when applied in multiple layers (Comparative Examples 2 and 3). In addition, if the incorporation ratio of (B) agar increases, there is a problem of non-solidification (Comparative Examples 4 and 7).

[0094] When xanthan gum, a polysaccharide used as a water-soluble thickener, is used instead of (B) agar of the present invention, the sense of moisture cannot be sufficiently obtained (Comparative Example 5).

[0095] On the other hand, when (C) trimethylsilanoxysilicate is blended at a certain blending ratio in addition to (A) wax and (B) agar, it is possible to obtain a water-in-oil emulsified solid cosmetic (Examples 1 to 6) in which the disadvantages caused by blending (B) agar (stickiness and makeup removal) are suppressed and the advantages of the feel in use brought about by blending (B) agar are not impaired.

[0096] It should be noted that when the blending ratio of (B) agar to (C) trimethylsilanoxysilicate ((C) / (B) ratio) is less than 0.3, stickiness cannot be sufficiently suppressed and it is not suitable for overcoating (Comparative Examples 6 and 7).

Claims

1. A water-in-oil emulsified solid cosmetic, comprising: (A) Wax, (B) agar, and (C) trimethylsiloxysilicate, The mixing ratio of the component (A) to the component (B), i.e., (A) / (B) is 4 to 150 by mass ratio. The mixing ratio of the component (C) to the component (B), that is, (C) / (B), is 0.3 to 30 in terms of mass ratio.

2. The water-in-oil emulsified solid cosmetic according to claim 1, further comprising (D) a pigment having a hydrophobic surface.

3. The water-in-oil emulsified solid cosmetic according to claim 1, further comprising (E) a dispersant.

4. The water-in-oil emulsified solid cosmetic according to claim 2, wherein: The component (D) is dispersed in the oil phase.

5. The water-in-oil emulsified solid cosmetic according to claim 1, wherein: The component (A) is one or more selected from the group consisting of polyethylene wax, microcrystalline wax and paraffin wax.

6. The water-in-oil emulsified solid cosmetic according to claim 3, wherein: The component (E) is one or more selected from the group consisting of silicone-based, sorbitan fatty acid ester-based, polyglycerol fatty acid ester-based, and glycerol fatty acid ester-based.

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