Water-in-oil emulsion cosmetic

Abstract

To provide a water-in-oil type emulsified cosmetic which hardly gives a squeaky feeling even when containing a powder in a high content, is excellent in dispersion stability of the powder with time, and has both water resistance and washability.SOLUTION: (A) 0.5% by mass to 15% by mass of a glyceryl monofatty acid ester of a fatty acid having 16 to 22 carbon atoms and glycerin, (B) 10% by mass to 30% by mass of an inorganic powder, (C) 0.1% by mass to 5% by mass of an oil phase thickener, (D) 20% by mass or more of a liquid oil, (E) 0.02% by mass to 4% by mass of a glyceryl difatty acid ester of a fatty acid having 16 to 22 carbon atoms and glycerin, and (F) 10% by mass to 65% by mass of water, the water-in-oil emulsion cosmetic has a mass ratio of the content of the component (A) to the content of the component (E) [(A) / (E)] of 3 to 49.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-in-oil emulsion cosmetic that has little squeaky feeling even when it contains a high powder content, has excellent powder dispersion stability over time, and further has both water resistance and cleansability. [Background technology]

[0002] In the field of cosmetics, water-in-oil emulsion cosmetics have high water repellency, water resistance, and sweat resistance, and are also superior in skin protection and moisturizing properties to oil-in-water emulsion cosmetics, and are therefore widely used as hand creams, makeup cosmetics, sunscreen cosmetics, hair cosmetics, etc. Due to their characteristics, water-in-oil emulsion cosmetics are often used in cosmetics containing powder, such as foundations and sunscreen cosmetics. However, when a high content of functional powder is incorporated, while functionality such as UV protection and shielding properties can be enhanced, the desired functionality may not be achieved if the powder particles aggregate within the composition or settle over time. Furthermore, while water-in-oil emulsion cosmetics have high water resistance, cosmetics containing a high content of oily ingredients or cosmetics containing a high content of hydrophobic powders cannot be sufficiently removed by washing with a cleansing agent alone, and often require physical removal by rubbing, etc. Therefore, good cleansing properties are an important characteristic in reducing the burden on the skin caused by friction.

[0003] One technology for water-in-oil emulsion cosmetics containing powder has been reported, which contains a cross-linked polyether-modified silicone with a specific structure, a dextrin fatty acid ester and / or an inulin fatty acid ester, an acrylamide-based thickener, and 10% by mass or more of powder, and which exhibits excellent usability and powder dispersion stability (Patent Document 1). However, the compatibility of water resistance and cleansability was insufficient. Another technology for water-in-oil emulsion cosmetics containing a cross-linked polyether-modified silicone with a specific structure, a dextrin fatty acid ester and / or an inulin fatty acid ester, an acrylamide-based thickener, and 10% by mass or more of powder was reported, which contains 6 to 40% by mass of an ultraviolet absorber, an oil-phase thickener, and one or more hydrophobic powders selected from (i) hydrophobized talc, (ii) a silicone powder with an average particle size of 30 μm or more, and (iii) a cross-linked polymethyl methacrylate powder with a cross-linking density of 40% or more, and which contains no ultraviolet scattering agent or contains no more than 6% by mass of an ultraviolet scattering agent (Patent Document 2). However, the dispersion stability of the powder when incorporated at a high powder content was insufficient. A water-in-oil makeup cosmetic containing isostearic acid, a pigment-grade powder, an emulsifier with an HLB value of more than 0 and not more than 8, and water has been reported as a powder-containing cosmetic that combines water resistance and cleansing properties (Patent Document 3). However, scrubbing of the skin is required for thorough cleansing, and the burden on the skin is not sufficiently reduced. In other words, it is difficult to say that a water-in-oil emulsion cosmetic containing powder has been obtained that has little squeaky feeling, powder dispersion stability over time, good water resistance, and good cleansing properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-116354 [Patent Document 2] International Publication No. 2018 / 225765 [Patent Document 3] International Publication No. 2022 / 164117 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present invention has been made in consideration of the above-mentioned drawbacks of the conventional technology, and has an object to provide a water-in-oil emulsion cosmetic that has little squeaky feeling even when it contains a high powder content, has excellent powder dispersion stability over time, and further has both water resistance and cleansability. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the above-mentioned problems, and have found that they have been able to solve the above-mentioned problems by providing a cosmetic containing specific amounts of each of (A) a mono-fatty acid glyceryl formed from a fatty acid having 16 to 22 carbon atoms and glycerin, (B) an inorganic powder, (C) an oil phase thickener, (D) a liquid oil, (E) a di-fatty acid glyceryl formed from a fatty acid having 16 to 22 carbon atoms and glycerin, and (F) water.

[0007] That is, the present invention is as follows. [1] A water-in-oil emulsion cosmetic comprising the following: 0.5% by mass to 15% by mass of component (A), 10% by mass to 30% by mass of component (B), 0.1% by mass to 5% by mass of component (C), 20% by mass or more of component (D), 0.02% by mass to 4% by mass of component (E), and 10% by mass to 65% by mass of component (F), wherein the ratio of the content of component (A) to the content of component (E) [(A) / (E)] is 3 to 49 by mass. (A) mono-fatty acid glyceryl of a fatty acid having 16 to 22 carbon atoms and glycerin; (B) Inorganic powder, (C) an oil phase thickener, (D) liquid oil, (E) di-fatty acid glyceryl of a fatty acid having 16 to 22 carbon atoms and glycerin, and (F) Water. [2] The water-in-oil emulsion cosmetic according to [1], wherein the inorganic powder (B) is at least one selected from the group consisting of titanium oxide and zinc oxide. [3] The water-in-oil emulsion cosmetic according to [1] or [2], wherein the oil phase thickener (C) is one or more selected from the group consisting of fatty acid dextrins and organically modified clay minerals. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a water-in-oil emulsion cosmetic that has little squeaky feeling even when it contains a high powder content, has excellent powder dispersion stability over time, and further has both water resistance and cleansability. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention provides a water-in-oil emulsion cosmetic that can contain a high content of powder (hereinafter also referred to as "the emulsion cosmetic of the present invention" in this specification). The emulsion cosmetic of the present invention contains (A) a monoglyceryl fatty acid, (B) an inorganic powder, (C) an oil phase thickener, (D) a liquid oil, (E) a diglyceryl fatty acid, and (F) water.

[0010] <(A) Monoglyceryl fatty acids> The fatty acid monoglyceryl contained as component (A) in the emulsion cosmetic of the present invention is a monoester composed of a fatty acid and glycerin. From the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, the number of carbon atoms in the fatty acid that forms a monoester with glycerin is 16 to 22, preferably 16 to 20, more preferably 16 to 18, and particularly preferably 18. Furthermore, the fatty acid may be any of a straight-chain fatty acid, a branched-chain fatty acid, and a hydroxy fatty acid, but from the viewpoint of achieving both water resistance and cleansability, it preferably has one or more unsaturated bonds, more preferably 1 to 3, even more preferably 1 to 2, and particularly preferably 1. Specific examples of component (A) include glyceryl monopalmitate, glyceryl monoisopalmitate, glyceryl monohydroxypalmitate, glyceryl monostearate, glyceryl monoisostearate, glyceryl monohydroxystearate, glyceryl monooleate, glyceryl monolinoleate, glyceryl monolinolenate, glyceryl monobehenate, etc. One of these may be selected and used alone, or two or more may be selected and used in combination. From the viewpoint of achieving both water resistance and cleansing properties of the emulsion cosmetic of the present invention, glyceryl monooleate, glyceryl monolinoleate, and glyceryl monolinolenate are more preferably used as component (A), glyceryl monooleate and glyceryl monolinoleate are even more preferably used, and glyceryl monooleate is particularly preferably used.

[0011] The monoglyceryl fatty acid contained as component (A) can be produced from the above-mentioned fatty acids and glycerin by a production method known per se, but commercially available products provided by various companies for use in cosmetics can also be used. From the viewpoint of the present invention, the content of component (A) in the emulsion cosmetic of the present invention is 0.5% to 15% by mass, but from the viewpoints of reducing the squeaky feeling, powder dispersion stability, and cleansing properties, it is preferably 0.7% by mass or more, and more preferably 1% by mass or more. Furthermore, from the viewpoints of reducing the squeaky feeling and powder dispersion stability, it is preferably 12.5% ​​by mass or less, and more preferably 8% by mass or less.

[0012] <(B) Inorganic powder> The inorganic powder contained as component (B) in the emulsion cosmetic of the present invention is not particularly limited as long as it is one that is normally used as an inorganic pigment in cosmetics. Specific examples include inorganic body pigments (e.g., silica, talc, kaolin, mica, aluminum oxide, calcium carbonate, magnesium carbonate, barium sulfate, etc.); inorganic white pigments (e.g., titanium oxide, zinc oxide, zirconium oxide, etc.); inorganic red pigments (e.g., red iron oxide (iron sesquioxide), iron titanate, etc.); inorganic brown pigments (e.g., gamma-iron sesquioxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide (iron oxyhydroxide and ferric hydroxide), ochre, etc.); inorganic black pigments (e.g., black iron oxide (iron tetroxide), low-order titanium oxide, carbon black, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet (cobalt phosphate, ammonium cobalt phosphate hydrate, etc.), etc.); inorganic green pigments (e.g., , chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (for example, cobalt blue (cobalt aluminate), ultramarine (complex sodium aluminum sulfosilicate), Prussian blue (ferric ferrocyanide, ammonium ferric ferrocyanide), etc.); pearl pigments (for example, titanium mica (titanium oxide-coated mica), titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, bismuth oxychloride, etc.); colored pearl pigments (iron oxide-coated mica, iron oxide-coated mica titanium, carbon black-coated mica titanium, black iron oxide-coated mica titanium, iron hydroxide-coated mica titanium, Prussian blue-coated mica titanium, chromium hydroxide-coated mica titanium, chromium oxide-coated mica titanium, cobalt titanate-coated mica titanium, low-titanium oxide-coated mica, etc.).

[0013] In the present invention, as component (B), powders obtained by surface-treating the inorganic pigments described above with inorganic compounds such as silica, aluminum oxide, zirconium oxide, and aluminum hydroxide, or organic compounds such as silicone compounds, fluorine compounds (perfluoroalkyl phosphate esters, perfluoroalkyl phosphates, and perfluoroalkyl silanes), silane coupling agents, fatty acids (stearic acid, isostearic acid, and the like), acylated fatty acids (N-stearoyl-L-glutamic acid, and the like), metal soaps (aluminum stearate, and the like), and amino acids can also be used. For the purposes of the present invention, extender pigments such as silica, talc, mica, etc.; white pigments such as titanium oxide and zinc oxide; iron oxides (red iron oxide, yellow iron oxide, black iron oxide, etc.); and hydrophobic treated powders thereof (silicone-treated powder, fatty acid-treated powder, acylated fatty acid-treated powder, metal soap-treated powder, etc.) are preferably used. In the present invention, spherical silica and porous silica are preferably used as silica, and titanium oxide whose photocatalytic activity has been suppressed by treatment with aluminum hydroxide, etc. is preferably used. Furthermore, from the viewpoint of the water resistance of the emulsion cosmetic of the present invention, it is more preferable to use a hydrophobized powder, and from the viewpoint of achieving both water resistance and cleansing properties, it is more preferable to use silica, talc, mica, iron oxide, titanium oxide, or zinc oxide, and for white coloring and ultraviolet protection, it is particularly preferable to use titanium oxide or zinc oxide.

[0014] The average particle size of the inorganic powder used as component (B) in the emulsion cosmetic of the present invention can be adjusted to an appropriate range depending on its intended use, but when used as a pigment, it is preferably 10 nm to 100 μm, more preferably 50 nm to 50 μm, and even more preferably 100 nm to 30 μm. When used as an ultraviolet scattering agent, it is preferably 10 nm to 100 nm, and more preferably 10 nm to 50 nm. Here, the "average particle size" refers to the average particle size of the primary particles of the inorganic powder, and is measured by the dynamic light scattering method or the laser diffraction / scattering method.

[0015] In the present invention, the inorganic powders may be used singly or in combination of two or more. As the inorganic powder, commercially available products for use in cosmetics provided by various companies can be used.

[0016] The content of component (B) in the emulsion cosmetic of the present invention is 10% to 30% by mass. From the viewpoint of preventing any squeaky feeling and powder dispersion stability in the emulsion cosmetic of the present invention, the content of component (B) is preferably 28% by mass or less, and more preferably 25% by mass or less. Furthermore, from the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, the content of component (B) is preferably 11% by mass or more, and more preferably 12% by mass or more.

[0017] The ratio of the content of component (B) to the content of component (A) in the emulsion cosmetic of the present invention [(B) / (A)] is preferably within a range of 1 to 30 in mass ratio, and from the viewpoints of powder dispersion stability and achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, it is more preferably 1 to 25, and even more preferably 1 to 15.

[0018] <(C) Oil phase thickener> The oil phase thickener contained as component (C) in the emulsion cosmetic of the present invention is not particularly limited as long as it is one that is commonly used in cosmetics. Specific examples include fatty acid dextrins (ester compounds of linear or branched saturated or unsaturated fatty acids having 14 to 24 carbon atoms and dextrin having an average degree of polymerization of 20 to 50, such as dextrin myristate, dextrin palmitate, dextrin oleate, dextrin stearate, dextrin (palmitate / 2-ethylhexanoate), dextrin (palmitate / hexyldecanoate), etc.), fatty acid inulin, Examples include acylated sugars such as stearate inulin; metal soaps such as aluminum salts of fatty acids (e.g., aluminum dimyristate, aluminum stearate), and calcium salts of fatty acids (e.g., calcium stearate); organically modified clay minerals such as dimethyl distearyl ammonium hectorite, dimethyl distearyl ammonium bentonite, benzyl dimethyl stearyl ammonium hectorite, and benzyl dimethyl stearyl ammonium bentonite; and polyalkylene glycols such as ethylene-propylene copolymers. In the emulsion cosmetic of the present invention, from the viewpoint of achieving both water resistance and cleansing properties, fatty acid dextrins and organically modified clay minerals are preferably used as component (C), and fatty acid dextrins are more preferably used.

[0019] In the emulsion cosmetic of the present invention, from the viewpoint of achieving both water resistance and cleansing properties, the fatty acid dextrin used as component (C) preferably has a degree of polymerization of 20 to 30 and the fatty acid to be esterified is a saturated fatty acid having 14 to 20 carbon atoms, and of these, dextrin myristate, dextrin palmitate, and (palmitic acid / hexyldecanoic acid) dextrin are even more preferred. The degree of substitution of the fatty acid in the dextrin is preferably 1.5 to 2. In the present invention, the organically modified clay mineral used as component (C) is preferably dimethyl distearyl ammonium hectorite or benzyl dimethyl stearyl ammonium hectorite, and more preferably dimethyl distearyl ammonium hectorite.

[0020] In the present invention, the above oil phase thickeners can be used alone or in combination of two or more. As the oil phase thickener, commercially available products provided by various companies for use in cosmetics can be used.

[0021] The content of component (C) in the emulsion cosmetic of the present invention is 0.1% to 5% by mass. From the viewpoints of the squeaky feeling, powder dispersion stability, and cleansing properties of the emulsion cosmetic of the present invention, the content of component (C) is preferably 0.25% by mass or more, and more preferably 0.5% by mass or more. Furthermore, from the viewpoints of the squeaky feeling and powder dispersion stability of the emulsion cosmetic of the present invention, the content of component (C) is preferably 3% by mass or less, and more preferably 2% by mass or less. Furthermore, from the viewpoint of the present invention, the ratio of the content of component (C) to the content of component (A) in the emulsion cosmetic of the present invention [(C) / (A)], in mass ratio, is preferably 0.05 to 5. Furthermore, from the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, (C) / (A) is more preferably 0.1 to 4, and even more preferably 0.1 to 3.

[0022] <(D) Liquid oil> The liquid oil contained as component (D) in the emulsion cosmetic of the present invention is liquid at 25°C, i.e., is an oil that has fluidity at 25°C, and can be any oil that is used in cosmetics without any particular limitations, and examples of such oils include animal and vegetable oils, hydrocarbon oils, ester oils, silicone oils, liquid higher fatty acids, and liquid higher alcohols. From the viewpoint of the effect of reducing the squeaky feeling in the emulsion cosmetic of the present invention, (D-1) hydrocarbon oil, (D-2) triglyceride of medium-chain fatty acid or branched-chain fatty acid, (D-3) ester of medium-chain or long-chain fatty acid and branched-chain aliphatic alcohol, (D-4) silicone oil, (D-5) liquid higher fatty acid, and (D-6) liquid ester of unsaturated carboxylic acid or aromatic carboxylic acid are preferably used. Examples of (D-1) hydrocarbon oils include liquid paraffin, hydrogenated polyisobutene (light liquid isoparaffin, liquid isoparaffin, heavy liquid isoparaffin), paraffin, dodecane, squalene, and squalane, with squalane and hydrogenated polyisobutene being preferred, and squalane being more preferred. (D-2) Examples of triglycerides of medium-chain or branched-chain fatty acids include tri(caprylic / capric acid) glyceryl, tri-2-ethylhexanoate, and glyceryl triisostearate, with tri(caprylic / capric acid) glyceryl being preferred. (D-3) Examples of esters of medium- or long-chain fatty acids and branched-chain aliphatic alcohols include isononyl isononanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, and 2-ethylhexyl palmitate. Isononyl isononanoate and isopropyl myristate are preferred, and isononyl isononanoate is more preferred. Examples of silicone oils (D-4) include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and tetrahydrotetramethylcyclotetrasiloxane; and silicone surfactants such as polyoxyethylene-methylpolysiloxane copolymers and polyoxyethylene-polydimethylsiloxyethyl-methylpolysiloxane copolymers. Dimethylpolysiloxane, methylphenylpolysiloxane, and polyoxyethylene-methylpolysiloxane copolymers are preferred, and dimethylpolysiloxane and polyoxyethylene-methylpolysiloxane copolymers are more preferred. (D-5) Liquid higher fatty acids include unsaturated fatty acids such as oleic acid, linoleic acid, and linolenic acid, and branched-chain fatty acids such as isopalmitic acid and isostearic acid, with oleic acid and isostearic acid being preferred. (D-6) Examples of liquid esters of unsaturated carboxylic acids or aromatic carboxylic acids include 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate (cinoxate), 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate (octocrylene), 2-ethylhexyl salicylate, and 3,3,5-trimethylcyclohexyl salicylate (homosalate).

[0023] From the viewpoint of reducing the squeaky feeling of the emulsion cosmetic of the present invention, (D-1) hydrocarbon oil, (D-2) triglyceride of medium-chain fatty acid or branched-chain fatty acid, (D-3) ester of medium-chain or long-chain fatty acid and branched-chain aliphatic alcohol, (D-4) silicone oil, and (D-6) liquid ester of unsaturated carboxylic acid or aromatic carboxylic acid are more preferably used as component (D), and (D-1) hydrocarbon oil, (D-2) triglyceride of medium-chain fatty acid or branched-chain fatty acid, (D-3) ester of medium-chain or long-chain fatty acid and branched-chain aliphatic alcohol, and (D-6) liquid ester of unsaturated carboxylic acid or aromatic carboxylic acid are even more preferably used. In addition, when (D-1) hydrocarbon oil is used in combination with one or more selected from the group consisting of (D-2) triglycerides of medium-chain or branched-chain fatty acids, (D-3) esters of medium-chain or long-chain fatty acids and branched-chain aliphatic alcohols, and (D-6) liquid esters of unsaturated carboxylic acids or aromatic carboxylic acids, the content ratio of (D-1) hydrocarbon oil to one or more selected from the group consisting of (D-2) triglycerides of medium-chain or branched-chain fatty acids, (D-3) esters of medium-chain or long-chain fatty acids and branched-chain aliphatic alcohols, and (D-6) liquid esters of unsaturated carboxylic acids or aromatic carboxylic acids [(D-1) / {one or more selected from the group consisting of (D-2), (D-3), and (D-6)]] is preferably 0.3 to 3 by mass.

[0024] In the present invention, the above liquid oils can be used alone or in combination of two or more. As the liquid oil, commercially available products provided by various companies for use in cosmetics can be used.

[0025] The content of component (D) in the emulsion cosmetic of the present invention is 20% by mass or more, and from the viewpoint of reducing the squeaky feeling of the emulsion cosmetic of the present invention, it is preferably 25% by mass or more, and more preferably 30% by mass or more. Furthermore, from the viewpoint of the stability and feel when used of the emulsion cosmetic of the present invention, the content of component (D) in the emulsion cosmetic of the present invention is preferably 65% ​​by mass or less, and more preferably 60% by mass or less.

[0026] <(E) Diglyceryl Fatty Acids> The difatty acid glycerin contained as component (E) in the emulsion cosmetic of the present invention is a diester composed of a fatty acid and glycerin. From the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, the number of carbon atoms in the fatty acid that forms a diester with glycerin is 16 to 22, preferably 16 to 20, more preferably 16 to 18, and particularly preferably 18. Furthermore, the fatty acid may be any of a straight-chain fatty acid, a branched-chain fatty acid, and a hydroxy fatty acid, but from the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, it preferably has one or more unsaturated bonds, more preferably 1 to 3 unsaturated bonds, even more preferably 1 to 2 unsaturated bonds, and particularly preferably 1 unsaturated bond. Specific examples of component (E) include glyceryl dipalmitate, glyceryl diisopalmitate, glyceryl dihydroxypalmitate, glyceryl distearate, glyceryl diisostearate, glyceryl dihydroxystearate, glyceryl dioleate, glyceryl dilinoleate, glyceryl dilinolenate, glyceryl dibehenate, etc. These may be used alone or in combination of two or more. From the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, glyceryl dioleate, glyceryl dilinoleate, and glyceryl dilinolenate are more preferably used, glyceryl dioleate and glyceryl dilinoleate are even more preferably used, and glyceryl dioleate is particularly preferably used.

[0027] The diglyceryl fatty acids contained as component (E) can be produced from the above-mentioned fatty acids and glycerin by a known production method, but commercially available products provided by various companies for use in cosmetics can also be used. From the standpoint of the present invention, the content of component (E) in the emulsion cosmetic of the present invention is 0.02 to 4% by mass. From the standpoint of suppressing the squeaky feeling of the emulsion cosmetic of the present invention, the content of component (E) is preferably 0.1 to 3% by mass, and more preferably 0.15 to 2% by mass. Furthermore, from the viewpoint of achieving both water resistance and cleansability in the emulsion cosmetic of the present invention, the ratio of the content of component (A) to the content of component (E) in the emulsion cosmetic of the present invention [(A) / (E)] is, in mass ratio, from 3 to 49, preferably from 4 to 33, more preferably from 4 to 20, and even more preferably from 4 to 10.

[0028] <(F)Water> In the emulsified cosmetic of the present invention, the water contained as component (F) is water suitable for producing cosmetics, and examples of such water include purified water as distilled water and ion-exchanged water. From the standpoint of the present invention, the content of component (F) in the emulsion cosmetic of the present invention is 10% to 65% by mass, and from the standpoint of powder dispersion stability and cleansing ability in the emulsion cosmetic of the present invention, it is preferably 15% by mass or more, more preferably 20% by mass or more, and even more preferably 25% by mass or more. Furthermore, from the standpoint of reducing the squeaky feeling in the emulsion cosmetic of the present invention, the content of component (F) in the emulsion cosmetic of the present invention is preferably 60% by mass or less, more preferably 55% by mass or less, and even more preferably 50% by mass or less.

[0029] <Other additives> Furthermore, the emulsion cosmetic of the present invention may contain additives commonly used in cosmetics, as needed, within the scope of not impairing the features of the present invention. Examples of such additives include functional ingredients such as vitamins, whitening agents, enzymes, cell activators, blood circulation promoters, antiseborrheic agents, anti-inflammatory agents, astringents, and ultraviolet absorbers; quality preservatives such as antioxidants, stabilizers, preservatives, bactericides, sequestering agents, and pH adjusters; and taste ingredients such as refreshing agents, fragrances, and colorings.

[0030] The emulsion cosmetic of the present invention can be produced by a general production method that is adopted depending on the form of the cosmetic. For example, it can be produced by heating and mixing components (A) to (E) uniformly, and then gradually adding component (F) while stirring to emulsify.

[0031] The emulsion cosmetic of the present invention can be provided in the form of an emulsion or cream, and can be provided, for example, as skin cosmetics such as emulsion, massage cream, face cream, and moisturizing cream; body cosmetics such as hand cream, foot cream, and body cream; sunscreen cosmetics such as sunscreen emulsion and sunscreen cream; makeup bases such as foundation lotion and foundation cream; base makeup cosmetics such as liquid foundation and cream foundation; and point makeup cosmetics such as eye color, cheek color, and lip color. The emulsion cosmetic of the present invention can contain inorganic powders that have coloring effects and UV protection effects, and therefore can be suitably provided particularly as sunscreen cosmetics, makeup bases, base makeup cosmetics, and the like.

[0032] The emulsion cosmetic of the present invention, even when containing a high content of powder, has little squeaky feeling, is excellent in powder dispersion stability over time, and can also achieve a good balance between water resistance and cleansability. [Example]

[0033] The present invention will be described in more detail below with reference to examples, but is not limited to these examples. In the following, "%" means "% by mass" unless otherwise specified.

[0034] [Examples 1 to 13, Comparative Examples 1 to 4] Water-in-oil emulsion cosmetics Using the compositions shown in Tables 1 and 2, water-in-oil emulsion cosmetics of Examples 1 to 13 and Comparative Examples 1 to 4 were prepared by the following production method. The components (A), (A'), (B), (C), (D), (E) and (F) shown in Tables 1 and 2 were made from the raw materials shown below. (1) Component (A) (i) Glyceryl monooleate: Glyceryl monooleate (Fujifilm Wako Pure Chemical Industries, Ltd.) was used after removing diesters and triesters using a preparative liquid chromatograph (LC-9130NEXT, Japan Analytical Industry Co., Ltd.). (ii) Glyceryl monoisostearate: This was obtained by removing the diester and triester from "glycerol monoisostearate" (Fujifilm Wako Pure Chemical Industries, Ltd.) using a preparative liquid chromatograph ("LC-9130NEXT", Japan Analytical Industry Co., Ltd.). (iii) Glyceryl monolinoleate: Glyceryl monolinoleate (Fujifilm Wako Pure Chemical Industries, Ltd.) was used after removing the diester and triester using a preparative liquid chromatograph (LC-9130NEXT, Japan Analytical Industry Co., Ltd.). (iv) Glyceryl monobehenate: This was obtained by removing the diester and triester from "Rikemal B-100" (Riken Vitamin Co., Ltd.) using a preparative liquid chromatograph ("LC-9130NEXT", Japan Analytical Industry Co., Ltd.). (2) Component (A') Diglyceryl monooleate: "NIKKOL DGMO-CVF" (Nikko Chemicals Co., Ltd.) (3) Component (B) (i) Aluminum hydroxide, stearic acid-treated titanium dioxide fine particles: "STV-455" (Titanium Kogyo Co., Ltd.) (ii) Isostearic acid-treated zinc oxide microparticles: "MZY-505EX" (Teika Corporation) (iii) Spherical porous silica: "Sunsphere H-51" (AGC Si-Tech Co., Ltd.) (iv) Mica: "Mica Y-3000" (Yamaguchi Mica Co., Ltd.) (4) Component (C) (i) Dextrin palmitate: "Leopearl KL2" (Chiba Flour Milling Co., Ltd.) (ii) Dextrin myristate: "Leopearl MKL2" (Chiba Flour Milling Co., Ltd.) (iii) Dimethyl distearyl ammonium hectorite: "Sumecton-SAN-P" (Kunimine Kogyo Co., Ltd.) (5) Component (D) (i) (D-1) Squalane: "Squalane" (Kanto Chemical Co., Ltd.) (ii) (D-3) Isononyl isononanoate: "KAK 99" (Kyukyu Alcohol Kogyo Co., Ltd.) (iii) (D-4) Dimethylpolysiloxane: "DOWSIL(TM) SH 200 C Fluid 100cs" (Dow Chemical Japan Co., Ltd.) (6) Component (E) (i) Glyceryl dioleate: "1,3-diolein (≥99%)" (Sigma-Aldrich) (ii) Glyceryl diisostearate: This was obtained from "EMALEX GWIS-200EX" (Nihon Emulsion Co., Ltd.) by removing the monoester and triester using a preparative liquid chromatograph ("LC-9130NEXT", Japan Analytical Industry Co., Ltd.). (iii) Glyceryl dilinoleate: This was obtained by removing the monoester and triester from "1,3-glyceryl dilinoleate" (Fujifilm Wako Pure Chemical Industries, Ltd.) using a preparative liquid chromatograph ("LC-9130NEXT", Japan Analytical Industry Co., Ltd.). (7) Component (F) Water: Ion-exchanged water

[0035] <Manufacturing method> (1) Components (A), (A'), (B), (C), (D) and (E) in Table 1 or 2 were placed in a beaker and stirred at 80°C until homogeneous. (2) While stirring with a homomixer, component (F) was gradually added to the mixture prepared in (1), and the mixture was emulsified by stirring and mixing. The mixture was then cooled to room temperature to obtain the water-in-oil emulsion cosmetics of the Examples and Comparative Examples.

[0036] The emulsion cosmetics of Examples 1 to 13 and Comparative Examples 1 to 4 were evaluated for their squeaky feeling, water resistance, cleansing properties, and powder dispersion stability as described below. The results are shown in Tables 1 and 2.

[0037] (i) Less creaking Twenty panelists applied 0.5 g of each emulsion cosmetic to their forearms and conducted a sensory evaluation, rating the results according to the following evaluation criteria. <Evaluation criteria> 2 points: It felt very smooth and there was almost no squeaking sensation. 1 point: Felt somewhat smooth, but had a slight squeaky feel. 0 points: There was almost no smoothness and it felt squeaky. The scores of the 20 panelists were totaled and the degree of creaking sensation was judged according to the following criteria. <Judgment criteria> ◎: The total score is 35 points or more. ○: The total score is between 30 and 34 points. △: The total score is between 20 and 29 points. ×: The total score is 19 points or less.

[0038] (ii) Water resistance Brilliant Blue (a water-soluble blue pigment) was mixed at 0.1% with each of the prepared emulsion cosmetics of the Examples and Comparative Examples, and the mixture was applied to artificial leather at a concentration of 2 mg / cm. 2 The solution was applied to the surface of the artificial leather at a concentration of 1000 ppm and left to stand for 20 minutes, after which the color difference of the surface of the artificial leather was measured using a spectrophotometer ("CM-2500c", Konica Minolta, Inc.). The artificial leather was then immersed in water at room temperature, stirred in the water for 40 minutes (100 rpm with a 3-1 motor), and thoroughly dried. After that, the color difference of the surface of the artificial leather after immersion in water was measured using the spectrophotometer. The residual rate of brilliant blue was calculated according to the following formula (I), and the water resistance of each emulsion cosmetic was evaluated according to the following evaluation criteria. Survival rate (%)=(ΔEa / ΔEb)×100 (I) ΔEa = color difference of the artificial leather surface after immersion in water ΔEb = color difference of the artificial leather surface before immersion in water <Evaluation criteria> ◎: Residual rate is 90% or more. ○: Residual rate is 80% or more but less than 90%. △: Residual rate is 70% or more but less than 80%. ×: The remaining rate is less than 70%.

[0039] (iii) Cleanability Brilliant Blue (a water-soluble blue pigment) was mixed at 0.1% with each of the prepared emulsion cosmetics of the Examples and Comparative Examples, and the mixture was applied to artificial leather at a concentration of 2 mg / cm. 2 The artificial leather was then coated with a solution of 0.5 mL at 100°C and allowed to stand for 20 minutes, after which the color difference of the surface was measured using a spectrophotometer ("CM-2500c", Konica Minolta, Inc.). Next, 0.5 mL of soapy water ("Kireikirei Medicated Foaming Hand Soap" (Lion Corporation)) was lathered using a pump foamer and applied to the artificial leather, and the lather was allowed to penetrate the entire surface without touching the coated surface. After allowing to stand for 15 seconds, the artificial leather was rinsed with water for 15 seconds using a shower at a flow rate of 1.6 L / min, thoroughly dried, and the color difference of the washed artificial leather surface was measured using the spectrophotometer. The cleaning rate of brilliant blue was calculated according to the following formula (II), and the cleaning ability was evaluated according to the following evaluation criteria. Cleaning rate (%) = (1-ΔEa / ΔEb) × 100 (II) ΔEa = color difference of the artificial leather surface after washing ΔEb = color difference of the artificial leather surface before washing <Evaluation criteria> ◎: Cleaning rate is 85% or more. Good: Cleaning rate is 75% or more but less than 85%. △: The cleaning rate is 65% or more but less than 75%. ×: The cleaning rate is less than 65%.

[0040] (iv) Dispersion stability of powder 50 mL of each of the prepared emulsion cosmetics of the Examples and Comparative Examples was placed in a screw tube, sealed, and stored at 40°C for one month to prepare samples. After one month, each sample was visually observed for the occurrence of striped patterns caused by aggregation of the powder contained in the sample, and the dispersion stability of the powder was evaluated according to the following evaluation criteria. <Evaluation criteria> ⊚: No stripes due to aggregation of inorganic powder contained in the sample were observed. ◯: Slight stripes due to aggregation of inorganic powder contained in the sample were observed. ×: A layer of aggregates of inorganic powder contained in the sample deposited on the bottom of the container was observed.

[0041] [Table 1]

[0042] [Table 2]

[0043] As shown in Table 1, the water-in-oil emulsion cosmetics of Examples 1 to 3 and Examples 5 to 13 were rated as "◎" or "○" for the degree of squeaky feeling, water resistance, cleansing ability, and powder dispersion stability. In particular, the water-in-oil emulsion cosmetic of Example 1, which contained 3% of glyceryl monooleate as component (A), 6% of aluminum hydroxide, stearic acid-treated titanium oxide microparticles, and 10% of isostearic acid-treated zinc oxide microparticles as component (B), 0.5% of dextrin palmitate as component (C), 25% of (D-1) squalane and 25% of (D-3) isononyl isononanoate as component (D), 0.5% of glyceryl dioleate as component (E), and 30% of component (F), was rated as "Excellent" in all of the following criteria: low squeaky feeling, water resistance, cleansing ability, and powder dispersion stability. The water-in-oil emulsion cosmetic of Example 4, which was similar to the water-in-oil emulsion cosmetic of Example 1 in terms of components (B) to (D) and component (F), but contained glyceryl monobehenate as component (A) and glyceryl diisostearate as component (E), was rated as "◎" for the lack of squeaky feeling and powder dispersion stability, and "○" for water resistance, but was rated as "△" for cleansing ability.

[0044] On the other hand, as shown in Table 2, the water-in-oil emulsion cosmetic of Comparative Example 1, which did not contain component (A), had a squeaky feeling when it contained a high content of powder, and was evaluated as having poor cleansing properties and poor powder dispersion stability. The water-in-oil emulsion cosmetic of Comparative Example 2, which contained 5% of component (B), below the lower limit of the present invention, had poor water resistance and insufficient cleansing ability, and was evaluated as being insufficient in terms of achieving both water resistance and cleansing ability. The water-in-oil emulsion cosmetic of Comparative Example 3, which contained component (A') (diglyceryl monooleate) in addition to component (A), did not contain component (C), and had a component (D) content of less than 20 mass%, had a slight squeaky feeling and was evaluated as having poor cleansing properties and dispersion stability. The water-in-oil emulsion cosmetic of Comparative Example 4, in which (A) / (E) was outside the range of 3 to 49, was evaluated as having insufficient water resistance and poor cleansing ability, and as being insufficient in terms of achieving both water resistance and cleansing ability.

[0045] Next, formulation examples of water-in-oil emulsion cosmetics of the present invention are shown in Tables 3 and 4. The components shown in Tables 3 and 4 were prepared from the raw materials listed below. (1) Component (A) Glyceryl monooleate: The raw materials described above for the ingredients shown in Table 1 were used. (2) Component (B) (i) Aluminum hydroxide, stearic acid-treated titanium oxide microparticles, isostearic acid-treated zinc oxide microparticles, spherical porous silica: For these components shown in Table 1, the above-mentioned raw materials were used. (ii) Pigment-grade titanium dioxide: "MKR-1S" (Sakai Chemical Industry Co., Ltd.) (iii) Talc: "Talc MS" (Nippon Talc Co., Ltd.) (iv) Iron oxide: "TALOX Synthetic Iron Oxide" (Titanium Industry Co., Ltd.) (3) Component (C) Dextrin palmitate, dimethyl distearyl ammonium hectorite: The above-mentioned raw materials were used for these components shown in Table 1. (4) Component (D) (i) (D-1) Hydrogenated polyisobutene: "Pearleam 4" (NOF Corporation) (ii) (D-1) Dodecane: "n-Dodecane" (Kanto Chemical Co., Ltd.) (iii) (D-2) Tri(caprylic / capric acid)glyceryl: "Panasate 810S" (NOF Corporation) (iv) (D-3) Isopropyl myristate: "IPM-R" (NOF Corporation) (v) (D-4) Dimethylpolysiloxane: The raw materials described above for the components shown in Table 1 were used. (vi) (D-4) Polyoxyethylene-methylpolysiloxane copolymer: "KF-6017" (Shin-Etsu Chemical Co., Ltd.) (vii) (D-6) 2-Ethylhexyl paramethoxycinnamate: "Uvinul MC80" (BASF Japan Ltd.) (Viii) 2-Ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate (Octocrylene): "Parsol 340" (DSM) (5) Component (E) Glyceryl dioleate: The raw materials described above for the ingredients shown in Table 1 were used. (6) Component (F) Purified water: Ion-exchanged water (7) Other additives (i) Glycerin: "RG·Co·P" (NOF Corporation) (ii) 1,3-butylene glycol: "1,3-butanediol" (Kanto Chemical Co., Ltd.) (iii) Glycerin mono 2-ethylhexyl ether: "Glymoist EH" (NOF Corporation) (iv) Phenoxyethanol: 2-phenoxyethanol (Kanto Chemical Co., Ltd.) (v) Fragrances: Commercially available cosmetic products were used. (vi) 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate hexyl: "Uvinul A Plus Granular" (BASF Japan Ltd.) (vii) 4-tert-butyl-4'-methoxydibenzoylmethane: "PARSOL1789" (DSM)

[0046] [Prescription example 1] According to the composition shown in Table 3, components (A) to (E) in the table, 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, and 4-t-butyl-4'-methoxydibenzoylmethane, among other additives, were mixed and heated to 75-80°C to prepare an oil phase. Meanwhile, glycerin and 1,3-butylene glycol, among other additives, were added to component (F), mixed, and heated to 75-80°C to prepare an aqueous phase. The aqueous phase was added to the oil phase, and the mixture was uniformly mixed and emulsified using a homomixer. After that, glycerin mono-2-ethylhexyl ether, phenoxyethanol, and fragrance, among other additives, were added and mixed uniformly to obtain the water-in-oil emulsion cosmetic of Formulation Example 1. The water-in-oil emulsion cosmetic of Formulation Example 1 can be suitably used as a sunscreen cream.

[0047] [Table 3]

[0048] [Prescription example 2] According to the composition shown in Table 4, components (A) to (E) in the table were mixed and heated to 75°C to 80°C to prepare an oil phase. Meanwhile, glycerin, among other additives, was added to component (F), mixed, and heated to 75°C to 80°C to prepare an aqueous phase. The aqueous phase was added to the oil phase, and the mixture was uniformly mixed and emulsified using a homomixer. After that, glycerin mono 2-ethylhexyl ether, phenoxyethanol, and fragrance, among other additives, were added and mixed uniformly to obtain a water-in-oil emulsion cosmetic of Formulation Example 2. The water-in-oil emulsion cosmetic of Formulation Example 2 can be suitably used as a cream foundation.

[0049] [Table 4] [Industrial Applicability]

[0050] As described above in detail, the present invention can provide a water-in-oil emulsion cosmetic that has little squeaky feeling even when it contains a high powder content, has excellent powder dispersion stability over time, and further has both water resistance and cleansability.

Claims

1. A water-in-oil emulsion cosmetic comprising the following: 0.5% by mass to 15% by mass of component (A), 10% by mass to 30% by mass of component (B), 0.1% by mass to 5% by mass of component (C), 20% by mass or more of component (D), 0.02% by mass to 4% by mass of component (E), and 10% by mass to 65% by mass of component (F), wherein the ratio of the content of component (A) to the content of component (E) [(A) / (E)] is 3 to 49 by mass. (A) mono-fatty acid glyceryl of a fatty acid having 16 to 22 carbon atoms and glycerin, (B) inorganic powder, (C) an oil phase thickener, (D) liquid oil, (E) di-fatty acid glyceryl of a fatty acid having 16 to 22 carbon atoms and glycerin; and (F) Water.

2. 2. The water-in-oil emulsion cosmetic according to claim 1, wherein the inorganic powder (B) is at least one selected from the group consisting of titanium oxide and zinc oxide.

3. 3. The water-in-oil emulsion cosmetic according to claim 1, wherein the oil phase thickener (C) is at least one selected from the group consisting of fatty acid dextrins and organically modified clay minerals.

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