JP2020033313A - Skin cosmetic - Google Patents

Abstract

To provide a three-layered skin cosmetic having stably three layers of an oil layer, a water layer and an O/W type emulsion layer.SOLUTION: There is provided a three-layered skin cosmetic which comprises: a component (A) one or more powders selected from nylon, hydrophilic silica, talc, polymethylmethacrylate, mica and calcium phosphate; a component (B): one or more powders selected from silicone elastomer particles, polystyrene, starch aluminum octenylsuccinate, hydrophobic silica and charcoal; a component C): ethanol; a component (D): water; and a component (E): one or more oily components selected from a hydrocarbon oil, an ester oil, a silicone oil and a higher alcohol, wherein the content ratio of the component (E) is 5.0 to 50.0 mass%, the mass ratio [component (A)/component (B)] is 15/85 to 75/25, the mass ratio [component (c)/component (D)] is 20/80 to 70/30 and the mass ratio [component (E)/{component (C)+(component (D)}] of component (E) to the total of component (C) and component (D) is 0.05 to 1.0.SELECTED DRAWING: Figure 1

Description

  The present invention relates to skin cosmetics.

  2. Description of the Related Art Conventionally, from the viewpoint of enhancing functionality and aesthetics, a multi-layer (multi-layer) cosmetic in which the appearance is separated into two or three layers is known. As the most common two-layer cosmetics, a two-layer cosmetic separated into an oil layer and an aqueous layer (see Patent Document 1) and a two-layer cosmetic with an oil layer and an oil layer (see Patent Document 2) are known. ing. Examples of the three-layer cosmetic include three-layer cosmetics of an oil layer, a surfactant layer, and an aqueous layer (see Patent Documents 3 and 4), and three layers of an oil layer, a surfactant layer, and a polyhydric alcohol layer. Layered cosmetics (see Patent Document 5), three-layered cosmetics of an oil layer-oil layer-water layer, and the like are known. In addition, there are many cosmetics called a two-layer type by a powder sedimentary layer and an aqueous layer.

JP 2013-139411 A JP 2004-115485 A JP 2005-206557 A JP 2008-290960 A JP-A-4-290810

  However, heretofore, a multilayer cosmetic having three layers of an oil layer, an aqueous layer, and an oil-in-water (O / W) emulsion layer has not been known.

  Accordingly, an object of the present invention is to provide a three-layer type skin cosmetic having three layers, that is, an oil layer, an aqueous layer, and an O / W emulsion layer.

  The present inventors have found that the above three-layered skin cosmetic can be obtained by using a Pickering emulsion under specific conditions. That is, a specific two kinds of powders are included in a specific ratio, ethanol and water are included in a specific ratio, further a specific oil component is included in a specific mass ratio, and the specific oil component with respect to the total of ethanol and water is included. By setting the mass ratio in a specific range, it was found that a three-layer type skin cosmetic having three layers of an oil layer, an aqueous layer, and an O / W emulsion layer stably can be obtained. The present invention has been completed based on these findings.

That is, the present invention comprises the following components (A), (B), (C), (D), and (E):
The content ratio of the component (E) is 5.0 to 50.0% by mass,
A mass ratio of the component (A) to the component (B) [component (A) / component (B)] is 15/85 to 75/25,
A mass ratio of the component (C) to the component (D) [component (C) / component (D)] is 20/80 to 70/30,
The mass ratio of the component (E) to the total of the component (C) and the component (D) [component (E) / {component (C) + component (D)}] is 0.05 to 1.0. ,
A three-layer type skin cosmetic is provided.
Component (A): one or more powders selected from the group consisting of nylon, hydrophilic silica, talc, polymethyl methacrylate, mica, and calcium phosphate Component (B): silicone elastomer particles, polystyrene, starch aluminum octenyl succinate, hydrophobic One or more powders selected from the group consisting of hydrophobic silica and charcoal Component (C): Ethanol Component (D): Water Component (E): Group consisting of hydrocarbon oil, ester oil, silicone oil, and higher alcohol One or more oily components selected from

  The skin cosmetic preferably has a surfactant content of 0.01% by mass or less.

  According to the skin cosmetic of the present invention, a three-layer skin cosmetic having an oil layer, an aqueous layer, and an O / W emulsion layer stably can be obtained. By having an O / W emulsion layer having opaque characteristics in addition to the oil layer and the water layer, it has a clear three-layer appearance and is excellent in aesthetics. Furthermore, by using the Pickering emulsion which is a powder emulsification, when applied to the skin, there is no stickiness such as a surfactant and a smooth feeling of use can be obtained.

It is the schematic which shows the three-layer type external appearance of the skin cosmetics of this invention.

  The skin cosmetic of the present invention comprises one or more powders selected from the group consisting of nylon, hydrophilic silica, talc, polymethyl methacrylate, mica, and calcium phosphate; silicone elastomer particles, polystyrene, starch aluminum octenyl succinate, hydrophobicity At least one powder selected from the group consisting of silica and charcoal; ethanol; water; and at least one oil component selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and higher alcohols. Including. In this specification, one or more powders selected from the group consisting of nylon, hydrophilic silica, talc, polymethyl methacrylate, mica, and calcium phosphate may be referred to as “component (A)”. Further, at least one powder selected from the group consisting of silicone elastomer particles, polystyrene, starch aluminum octenylsuccinate, hydrophobic silica, and charcoal may be referred to as “component (B)”. Ethanol may be referred to as “component (C)” in some cases. Water may be referred to as “component (D)” in some cases. One or more oily components selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and higher alcohols may be referred to as “component (E)”.

  That is, the skin cosmetic of the present invention contains at least the component (A), the component (B), the component (C), the component (D), and the component (E). The skin cosmetic of the present invention may contain components other than the above-mentioned components (A) to (E). Further, each component contained in the skin cosmetic of the present invention, for example, each component such as component (A), component (B), component (C), component (D), component (E), and other components is , May be used alone or in combination of two or more.

  The skin cosmetic of the present invention is of a three-layer type having an external appearance of three layers. More specifically, a three-layer system having layers in the order of [oil layer, O / W emulsion layer, water layer], and a three-layer system having layers in the order of [oil layer, water layer, O / W emulsion layer] An expression is given, and usually the former is often used. For example, in the case of the former, the skin cosmetic X of the present invention shown in FIG. 1 is a three-layered skin having layers in the order of oil layer 1, O / W emulsion layer 2, and water layer 3 in the container 4 from the top. Has become a cosmetic. The O / W emulsion layer 2 is a layer of a pickling emulsion formed using the components (A) to (E).

  The skin cosmetic of the present invention has a three-layer system consisting of an oil layer, an O / W emulsion layer, and an aqueous layer, so that when it is stirred in a container, it is re-emulsified so that the entire system is an O / W emulsion. And can be used as skin cosmetics. It should be noted that the three-layer type having such a structure makes it possible to reduce the O / W compared with a case where a transparent layer such as a three-layer type cosmetic having two oil layers or a cosmetic having a surfactant layer is used. Since the mold emulsion layer is opaque, three distinct layers can be formed. Also, unlike a cosmetic having a surfactant layer, it can suppress stickiness, sliminess and irritation to the skin at the time of application, and a dry feeling of the skin by using the components (A) and (B). Excellent. Further, by using the pickering emulsion, the stickiness of the oil layer can be masked with a powder, so that a relatively sticky oily component can be used, and the variation of the oil layer is widened. After the interfaces between the layers have disappeared and become uniform, the interfaces of the respective layers appear by being allowed to stand for a certain period of time, and the appearance of the three-layer system is again obtained.

[Component (A)]
Component (A) is one or more powders selected from the group consisting of nylon, hydrophilic silica, talc, polymethyl methacrylate (PMMA), mica, and calcium phosphate. As the component (A), only one type may be used, or two or more types may be used.

  Examples of the nylon include nylon-12, nylon-10 / 10, nylon-6, and the like. Examples of commercially available nylons include, for example, "Gantz Pearl GPA-550" (trade name, manufactured by Aika Kogyo Co., Ltd.).

  The hydrophilic silica is a silica that has not been subjected to a hydrophobic treatment, and is generally a general silica. The hydrophilic silica is, for example, silica (silicic anhydride) whose surface remains a silanol group and a siloxane group, and is a silica which has not been subjected to a hydrophobic treatment as described later. Examples of commercially available products of the above-mentioned hydrophilic silica include “Silica Microbeat P-1500” (trade name) (manufactured by Nikki Shokubai Kasei Co., Ltd.).

  Examples of commercially available products of the talc include “Talc MS” (trade name, manufactured by Nippon Talc Co., Ltd.).

  Examples of the polymethyl methacrylate include polymethyl methacrylate, methyl methacrylate crosspolymer, (methyl methacrylate / glycol dimethacrylate) crosspolymer, and the like. Examples of commercially available polymethyl methacrylate include “Matsumoto Microsphere M” (trade name, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.).

  Examples of the mica include sericite, titanium mica in which the surface of mica is coated with titanium oxide, and the like. Commercial products of the above mica include, for example, trade name “Serisite DN-MC” (manufactured by Dainippon Kasei Co., Ltd.), trade name “RonaFair Extender W” (manufactured by Merck), and the like.

  Examples of the calcium phosphate include monocalcium phosphate, dicalcium phosphate, tricalcium phosphate and the like. Examples of the commercially available calcium phosphate include “dicalcium phosphate” (trade name, manufactured by Matsuo Pharmaceutical Co., Ltd.).

  It is preferable that the component (A) is charged at a ratio of 10 g / L into a mixture of 10% by mass of ethanol and 90% by mass of water at room temperature and normal pressure, stirred, and uniformly dispersed. When the component (A) is used, the component (A) easily functions as a hydrophilic powder for forming a more stable three-layer type.

[Component (B)]
Component (B) is one or more powders selected from the group consisting of silicone elastomer particles, polystyrene, starch aluminum octenyl succinate, hydrophobic silica, and charcoal. As the component (B), only one type may be used, or two or more types may be used.

  Examples of the silicone elastomer particles include polymethylsilsesquioxane, cross-linked methyl polysiloxane, methyl siloxane network polymer, cross-linked silicone / network type silicone block copolymer, dimethicone crosspolymer, vinyl dimethicone crosspolymer, dimethicone / vinyl Dimethicone crosspolymer, (vinyl dimethicone / methicone silsesquioxane) crosspolymer, dimethicone crosspolymer-3, and the like.

  Examples of the polystyrene include crosslinked polystyrene. Examples of commercially available products of the polystyrene include, for example, “Gantz Pearl GS-1105M” (trade name, manufactured by Aika Kogyo Co., Ltd.).

  The above-mentioned starch aluminum octenyl succinate may be referred to as starch octenyl succinate Al or corn starch aluminum octenyl succinate in some cases. Commercially available products of starch aluminum octenyl succinate include, for example, “DRY-FLO PURE” (trade name, manufactured by Akzo Nobel Chemicals), and “Octier” (trade name, manufactured by Nisseki Chemical Co., Ltd.).

  The hydrophobic silica is silica obtained by subjecting a hydrophilic silica to a hydrophobic treatment. Examples of the treating agent used for the hydrophobizing treatment include methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, hexamethyldisilazane, methyltrialkoxysilane, dimethyldialkoxysilane, trimethylalkoxysilane, ethyltrichlorosilane, and propyltrichlorosilane. Organic silyl compounds such as, hexyltrichlorosilane, long-chain alkyltrichlorosilane, ethyltrialkoxysilane, propyltrialkoxysilane, hexyltrialkoxysilane, long-chain alkyltrialkoxysilane, methacrylsilane, fluoroalkylsilane, and perfluoroalkylsilane; dimethyl Polysiloxane (silicone oil), methylphenyl polysiloxane, methyl hydrogen polysiloxane, amino-modified Recone like silicone compounds such. The hydrophobic treatment can be performed using a known method, and examples thereof include a liquid phase method, a gas phase method, and an autoclave method.

  As the hydrophobic silica, specifically, for example, dimethylsiloxylated silica, trimethylsiloxylated silica, octylsiloxylated silica, silicone oil-treated silica, methacrylsiloxylated silica, silica coated with methylhydrogenpolysiloxane And the like.

  Examples of commercially available hydrophobic silica include “HDK H2000” (trade name, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.).

  Examples of the charcoal include activated carbon (medicated charcoal). The raw material of the activated carbon is not particularly limited, and those generally used as the raw material of the activated carbon can be used. Specifically, for example, coconut shell, wood, sawdust, coal, phenolic resin, rayon, acrylonitrile, coal pitch, petroleum pitch and the like can be mentioned. Among them, coconut shell, wood, phenol resin, and coal are preferred. Examples of commercially available products of the above-mentioned charcoal include “Medicinal Charcoal” (trade name, manufactured by Horie Seiyaku Co., Ltd.).

  It is preferable that the component (B) is not added to a mixture of 10% by mass of ethanol and 90% by mass of water at a normal temperature and normal pressure at a ratio of 10 g / L, stirred, and not uniformly dispersed. When the component (B) is used, the component (B) easily functions as a hydrophobic powder for forming a more stable three-layer type.

  The component (A), when used alone, is a powder capable of forming an O / W-type Pickering emulsion by mixing with water and an oily component. By using a combination of two kinds of powders of the component (A) which is relatively hydrophilic and the component (B) which is relatively hydrophobic, an O / W emulsion is formed, and then the O / W emulsion is formed. Part of the emulsion is disintegrated (demulsified) to cause leakage of oily components in the emulsion, thereby enabling an oil layer to appear. Further, by using the component (A) and the component (B), which are powders, it is possible to impart a dry feeling to the skin after application.

  The mass ratio [Component (A) / Component (B)] of the component (A) and the component (B) in the skin cosmetic of the present invention is 15/85 to 75/25, preferably 17/83 to 73. / 27, more preferably 20/80 to 70/30. When the mass ratio is within the above range, a partial collapse of the O / W emulsion is stably generated, and a three-layer system including the O / W emulsion layer can be obtained. In addition, the mass of the component (A) is the sum of the masses of all the components (A) in the skin cosmetic of the present invention, and the mass of the component (B) is the total of the mass of the skin cosmetic of the present invention. Of the component (B).

  The content ratio (total content ratio) of the component (A) and the component (B) in the skin cosmetic of the present invention is 0.5 to 20.0% by mass based on 100% by mass of the skin cosmetic of the present invention. Is more preferable, and more preferably it is 1.0 to 18.0 mass%. When the content is within the above range, three layers including the O / W emulsion layer can be formed more stably. Further, when the content is 0.5% by mass or more, the skin after application can be made more excellent in dry feeling.

[Component (C)]
Component (C) is ethanol. The component (C) is soluble in water, has a property of being compatible with oily components, reduces the polarity of the aqueous layer, and controls the adsorption of the components (A) and (B) to the oil-water interface. And a stable three-layer separation state can be formed. Further, the dispersibility of the component (A) and the component (B) can be improved. Further, it provides quick drying after application.

[Component (D): water]
The component (D) is water, and is not particularly limited, but purified water is preferable. The component (D) is a component that becomes a matrix and an aqueous layer of the O / W emulsion layer in the three-layer skin cosmetic of the present invention. The content ratio of the component (D) in the skin cosmetic of the present invention is preferably 10.0 to 60.0% by mass, more preferably 15.0 to 55, based on 100% by mass of the skin cosmetic of the present invention. 0.0% by mass.

  The mass ratio [component (C) / component (D)] of the component (C) and the component (D) in the skin cosmetic of the present invention is 20/80 to 70/30, preferably 22/78 to 68. / 32, more preferably 25/75 to 65/35. If the mass ratio is less than 20/80 (that is, if the component (C) is small), it is presumed that the component (B) does not adsorb to the interface. It becomes a layer state. On the other hand, when the mass ratio is larger than 70/30 (that is, when the amount of the component (C) is large), it is presumed that the polarity difference between the oil layer and the aqueous layer becomes small, but no emulsion is formed.

  The content ratio (total content ratio) of the component (C) and the component (D) in the skin cosmetic of the present invention is 20.0 to 90.0% by mass based on 100% by mass of the skin cosmetic of the present invention. Is more preferable, and more preferably 25.0 to 85.0% by mass. When the content is 20.0% by mass or more, the dispersibility of the component (B) in the aqueous layer is improved, and the three layers can be formed more stably. When the content ratio is 90.0% by mass or less, the volume of the oil layer becomes relatively large, and the three-layer appearance can be more sufficiently confirmed.

[Component (E)]
Component (E) is one or more oily components selected from the group consisting of hydrocarbon oils, ester oils, silicone oils, and higher alcohols. The component (E) is a component that becomes a medium of an oil layer in the three-layered skin cosmetic of the present invention. As the component (E), only one type may be used, or two or more types may be used.

  Examples of the hydrocarbon oil include α-olefin oligomers, petrolatum, isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, hydrogenated (tetradecenyl / methyl) Pentadecene), isododecane and the like.

  Examples of the ester oil include ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyl dodecyl myristate, isopropyl isostearate, isopropyl glycol isostearate, and propylene glycol isostearate. Cetyl ethylhexanoate, glyceryl tri-2-ethylhexanoate, glyceryl tri (caprylate / caprate), isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraoctanoate, pentaerythrityl tetraisostearate, diisostearyl malate Erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, hexa (hydroxystearic acid / stearic acid / rosinic acid) Dipentaerythrityl, tetra (hydroxystearic acid / isostearic acid) dipentaerythrityl, hexahydroxystearic acid dipentaerythrityl, (ethylhexanoic acid / stearic acid / adipate) glyceryl, tri (caprylic / capric / myristic / stearic) glyceryl, hexa ( Behenic acid / benzoic acid / ethylhexanoic acid) dipentaerythrityl, alkyl benzoate (C12-15) and the like.

  Examples of the silicone oil include, but are not particularly limited to, dimethyl silicone oil such as methylpolysiloxane (dimethicone) and highly polymerized methylpolysiloxane; methylphenyl silicone oil such as methylphenylpolysiloxane; methylcyclopolysiloxane; Cyclic silicone oils such as tetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane; aminopropylmethylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylmethylsiloxane Amino-modified silicone such as dimethylsiloxane copolymer, carboxy-modified silicone, fatty acid-modified silicone, alcohol-modified silicone, aliphatic Alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, modified silicones such as alkyl-modified silicone; methylhydrogenpolysiloxane, and the like dimethiconol.

  Examples of the higher alcohol include aliphatic alcohols having 12 to 22 carbon atoms, such as cetyl alcohol, stearyl alcohol, isostearyl alcohol, myristyl alcohol, 2-octyldodecanol, and oleyl alcohol.

  The content ratio of the component (E) in the skin cosmetic of the present invention is 5.0 to 50.0% by mass, preferably 7.0 to 45.0% by mass, based on 100% by mass of the skin cosmetic of the present invention. 0% by mass. When the content ratio is 5.0% by mass or more, the volume of the oil layer is sufficient, and a stable three-layer skin cosmetic can be obtained. In addition, it has excellent moisture retention during application to the skin. When the content is 50.0% by mass or less, an O / W emulsion layer can be formed stably, and a stable three-layer skin cosmetic can be obtained. The content ratio of the component (E) is the sum of the content ratios of all the components (E) in the skin cosmetic of the present invention.

  The mass ratio of the component (E) to the total of the component (C) and the component (D) in the skin cosmetic of the present invention [component (E) / {component (C) + component (D)}] is 0.05. To 1.0, preferably 0.1 to 1.0, more preferably 0.5 to 1.0. When the mass ratio is 0.05 or more, the oil layer in the three-layer system can stably exist. When the mass ratio is 1.0 or less, the ratio of the component forming the oil layer to the component forming the aqueous layer is sufficiently small, so that the O / W emulsion layer can be stably present.

  In the skin cosmetic of the present invention, the content of the surfactant is preferably 0.01% by mass or less, more preferably 0.008% by mass or less based on 100% by mass of the skin cosmetic of the present invention. , Particularly preferably, it is substantially not contained. In addition, that it does not contain substantially means that it is not positively compounded, for example, excludes the case where it is inevitably present. When the content is 0.01% by mass or less, a three-layer structure can be more stably present. In addition, stickiness, sliminess and irritation to the skin at the time of application can be suppressed, and the smoothness of the skin by using the component (A) and the component (B) is improved.

  Examples of the surfactant include a nonionic surfactant, an anionic surfactant, a cationic surfactant, and an amphoteric surfactant.

  Examples of nonionic surfactants include, for example, sorbitan fatty acid esters, glycerin fatty acid esters, and alkylene oxide adducts thereof, polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene alkyl phenols, polyoxyethylene sorbite fatty acid esters, Polyoxyethylene alkylphenyl formaldehyde condensate, polyoxyethylene sterol and its derivatives, polyoxyethylene lanolin and its derivatives, polyoxyethylene beeswax derivatives, sugar esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene castor oil, etc. Can be

  Examples of the anionic surfactant include higher fatty acid soaps, alkyl sulfates, alkyl phosphates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl phenyl ether sulfates, alkyl ether phosphates, and alkyl ether carboxylic acids. Salt, acylmethyltaurine salt, N-acyl-N-methyl-β-alanine salt, N-acylglycine salt, N-acylglutamate, polyoxyethylene alkylcarboxylate, alkylphenylethersulfonate, alkylsulfosuccinic acid And its salts, N-acylsarcosine and its salts, polyoxyethylene coconut oil fatty acid monoethanolamide sulfate and the like.

  Examples of the cationic surfactant include amine salts such as alkylamine salts, fatty acid amidoamine salts, ester-containing tertiary amine salts, monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, and trialkyl quaternary ammonium salts. Examples include alkyl quaternary ammonium salts such as quaternary ammonium salts, benzalkonium type quaternary ammonium salts, cyclic quaternary ammonium salts such as alkyl pyridinium salts, and benzethonium chloride.

  Examples of the amphoteric surfactant include glycine-type amphoteric surfactants such as alkyl glycine salts, carboxymethyl glycine salts, N-acylaminoethyl-N-2-hydroxyethyl glycine salts, alkylaminopropionates, and alkyliminodipropionic acids. Aminopropionic acid type amphoteric surfactants such as salts, aminoacetic acid betaine type amphoteric surfactants such as alkyldimethylaminoacetate betaine and fatty acid amidopropyldimethylaminoacetate betaine, and sulfobetaine type amphoteric surfactants such as alkylhydroxysulfobetaine Is mentioned.

[Other ingredients]
The skin cosmetic of the present invention may contain components (other components) other than the above components (A) to (E) as long as the object of the present invention is not impaired. The other components are not particularly limited, and include, for example, components commonly used in cosmetics and quasi-drugs. Specifically, for example, lower alcohols other than the component (C); oily components other than the component (E) such as fats and oils, vegetable oils and waxes; polyhydric alcohols; emulsifiers such as higher fatty acids (salts); Thickeners such as acid / alkyl methacrylate copolymer, hydroxymethylcellulose, hydroxypropylmethylcellulose and xanthan gum; moisturizers; bactericides; pearlizing agents; anti-inflammatory agents such as glycyrrhizic acid and salts thereof; PH adjusters such as phosphoric acid and its salts, citric acid and its salts, lactic acid and its salts, sodium hydroxide and triethanolamine; fragrance; ultraviolet absorber; antioxidant; sequestering agent (chelating agent); Film-forming polymer compounds such as vinylpyrrolidone; pigments; pigments; vitamins; amino acids Astringents; whitening; animal and plant extracts; acid; and alkalis.

  The skin cosmetic of the present invention is used for applying to skin (skin). The site to which the skin cosmetic of the present invention is applied is not particularly limited, and includes, for example, a face (for example, forehead, eyes, eyes, cheeks, mouth, etc.), arms, elbows, back of hands, fingertips, feet, knees, and heels. , Neck, armpits, back and the like.

  The skin cosmetic of the present invention is not particularly limited, and can be produced by a known or commonly used method. For example, it can be manufactured by mixing the above components and stirring with a homomixer, paddle mixer or the like.

Conventionally, emulsification is achieved by adding relatively hydrophilic powder [component (A) of the present invention] to water [component (D) of the present invention] and oily component [component (E) of the present invention]. It is known to form O / W emulsions (Pickering emulsions). Thereby, a two-layer structure of the water layer and the O / W emulsion layer is obtained.
The skin cosmetic composition of the present invention further comprises a relatively hydrophobic specific powder [component (B)] and ethanol [component (B) with respect to the two-layer structure of the water layer and the O / W emulsion layer. C)], the O / W emulsion is partially destabilized and disintegrated (demulsified), part of the oil component leaks from the emulsion, and the O / W emulsion layer is left. An oil layer can be formed.
Here, [Component (A) / Component (B)], [Component (C) / Component (D)], and [Component (E) / {Component (C) + Component (D)}] are specified. By controlling the range, the emulsion can be stabilized and a stable three-layer structure can be formed.

  The mechanism for forming the stable three-layer structure of the present invention is presumed as follows. The present invention uses a hydrophilic powder and a hydrophobic powder in combination, and by appropriately controlling the polarity difference between the water layer and the oil layer, while forming a Pickering emulsion, the arrangement of the powder at the interface of the emulsion. Moderately disturbed. Thereby, while forming a stable emulsion, an oily component partially leaks from the emulsion. Therefore, a three-layer structure of an aqueous layer, an oil layer, and an O / W emulsion layer is formed.

  Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to only these Examples. In addition, the compounding amount described in the table is the compounding amount of each component (that is, the compounding amount of the active ingredient in each raw material; so-called pure content), and is represented by "% by mass" unless otherwise specified.

Examples 1 to 19, Comparative Examples 1 to 8
Using the components (components (A) to (E)) described in the table, skin cosmetics of Examples and Comparative Examples were prepared by a conventional method.

  The main components described in the table are as follows.

<Component (A)>
Nylon: trade name "Gantz Pearl GPA-550", manufactured by Aika Kogyo Co., Ltd. hydrophilic silica: trade name "Silica Microbeat P-1500", manufactured by Nikki Shokubai Kasei Co., Ltd. talc: trade name "talc MS", Nippon talc stock Company-made Serisite: trade name "Serisite DN-MC", Dainippon Kasei Co., Ltd. mica titanium: trade name "RonaFair Extender W", Merck polymethyl methacrylate: trade name "Matsumoto Microsphere M", Matsumoto Yushi Pharmaceutical Co., Ltd. calcium phosphate: trade name "dicalcium phosphate", Matsuo Pharmaceutical Co., Ltd. <Component (B)>
Polymethylsilsesquioxane: trade name “TOSPEARL 2000B ^* ”, manufactured by Momentive Performance Materials, Inc. Crosslinked methylpolysiloxane: trade name “DOW CORNING 9701 COSMETIC POWDER”, polystyrene manufactured by Toray Dow Corning Co., Ltd .: trade name "Gantz Pearl GS-1105M", Aika Kogyo Co., Ltd. Starch aluminum octenyl succinate: Trade name "DRY-FLO PURE", Akzo Nobel Chemicals Co., Ltd. Siloxane-coated silica: trade name "SI-SB 300", manufactured by Miyoshi Kasei Co., Ltd. <Component (C)>
Ethanol: trade name “90 ° general fermented alcohol”, manufactured by Takara Shuzo Co., Ltd. <Component (E)>
Liquid paraffin: trade name “CARNATION”, manufactured by Sonneborn isopropyl myristate: trade name “Exepearl IPM”, manufactured by Kao Corporation Dimethicone: trade name “DOWSIL SH200C Fluid 20cSt”, manufactured by Toray Dow Corning Co., Ltd.

(Evaluation)
Each skin cosmetic obtained in the examples and comparative examples was evaluated as follows. The evaluation results are shown in the table.

(1) Appearance The properties of the skin cosmetics obtained in Examples and Comparative Examples were visually observed, and the appearance was determined according to the following criteria.
[Appearance criteria]
（(Good): It can be confirmed that there are three layers: an oil layer, an O / W emulsion layer, and an aqueous layer.
X (poor): It cannot be confirmed that it is divided into three layers.

  The skin cosmetic (Example) of the present invention was visually confirmed to be divided into three layers, an oil layer, an O / W emulsion layer, and a water layer, and was excellent in aesthetics. On the other hand, when [Component (A) / Component (B)] was too high (Comparative Example 1) and too low (Comparative Example 2), formation of an oily layer could not be confirmed, and it was divided into two layers. When [Component (C) / Component (D)] was too high (Comparative Example 3), a stable emulsion was obtained, and formation of an oily layer could not be confirmed, resulting in two layers. When [Component (C) / Component (D)] is too low (Comparative Example 4), the components (A) and (B) do not disperse sufficiently, and the formation of an oil layer cannot be confirmed, resulting in two layers. I was In addition, when [Component (E) / {Component (C) + Component (D)}} was too high (Comparative Example 5), formation of an oil layer could not be confirmed, and the layer was separated into two layers. In addition, when [Component (E) / {Component (C) + Component (D)}] was too low (Comparative Example 6), formation of an oil layer could not be visually confirmed, and the oil layer was divided into two layers. In addition, when component (A) was not contained (Comparative Example 7) and when component (B) was not contained (Comparative Example 8), formation of an oil layer could not be confirmed, and it was divided into two layers.

(2) Smooth feeling Furthermore, about each skin cosmetic obtained in Examples 1 to 19, after stirring and homogenizing, about 0.5 g was applied to the skin with the palm, and the smooth feeling of the skin at the time of application was obtained. evaluated. As a result, all the skin cosmetics evaluated were evaluated as having a good feeling that the fingertips caught on the skin when the application surface was rubbed with a finger and that the skin had a smooth feeling.

X Skin cosmetic of the present invention 1 Oil layer 2 O / W emulsion layer 3 Water layer 4 Container

Claims (2)

It contains the following components (A), the following components (B), the following components (C), the following components (D), and the following components (E),
The content ratio of the component (E) is 5.0 to 50.0% by mass,
A mass ratio of the component (A) to the component (B) [component (A) / component (B)] is 15/85 to 75/25,
A mass ratio of the component (C) to the component (D) [component (C) / component (D)] is 20/80 to 70/30,
The mass ratio of the component (E) to the total of the component (C) and the component (D) [component (E) / {component (C) + component (D)}] is 0.05 to 1.0. ,
A three-layer skin cosmetic.
Component (A): one or more powders selected from the group consisting of nylon, hydrophilic silica, talc, polymethyl methacrylate, mica, and calcium phosphate Component (B): silicone elastomer particles, polystyrene, starch aluminum octenyl succinate, hydrophobic One or more powders selected from the group consisting of hydrophobic silica and charcoal Component (C): Ethanol Component (D): Water Component (E): Group consisting of hydrocarbon oil, ester oil, silicone oil, and higher alcohol One or more oily components selected from   The skin cosmetic according to claim 1, wherein the content of the surfactant is 0.01% by mass or less.

Images