Oil-in-water cosmetic

Abstract

The present invention provides an oil-in-water emulsified cosmetic having sufficient coverage, excellent usability, and excellent storage stability. This cosmetic further comprises (A) an iron oxide powder, (B) a surfactant, (C) an amphiphilic water-soluble polymer compound selected from the group consisting of polyacrylic acid alkyl derivatives and water-soluble alkyl-substituted polysaccharide derivatives, (D) an oil component, (E) water, and (F) a polyglycerol fatty acid ester. Here, the component (A) is hydrophobized and contained in the emulsified particles, and the content of the component (A) with respect to the total mass of the cosmetic is 0.75 mass% or more. In addition, the HLB of the component (B) is 8 or more, and the component (B) contains (b1) a non-silicone-based surfactant. The proportion of the component (b1) with respect to the total mass of the component (B) is 70 mass% or more.

Description

Oil-in-water type cosmetic

[0001] The present invention relates to an oil-in-water type cosmetic having sufficient covering power suitable for foundations and the like.

[0002] Cosmetics for which covering power is expected, such as foundations, often contain powders. Such powders include titanium oxide and zinc oxide, and oil-in-water type cosmetics containing these powders are known. Oil-in-water type cosmetics are preferably used because they give a fresh feeling and are excellent in elongation during use. However, on the other hand, it has been difficult to blend a large amount of powder compared to water-in-oil type cosmetics in some cases.

[0003] On the other hand, in oil-in-water type cosmetics containing these powders, increasing the blending amount of fine particle titanium oxide or fine particle zinc oxide or blending a small amount of iron oxide for the purpose of reducing the whiteness during application has been studied. However, in such oil-in-water type cosmetics, the covering power may be insufficient, and increasing the blending amount of iron oxide powder has been studied to improve it. It is possible to improve the covering power by increasing the content of iron oxide powder. However, according to the studies of the present inventors, although the covering power is improved when the content of iron oxide powder is increased, the usability, such as the fresh feeling and spreadability during use, tends to be inferior, and color streaks may occur on the appearance after long-term storage. Therefore, there has been a demand for cosmetics having sufficient covering power, usability, and storage stability.

[0004] International Publication No. 2023 / 195402 International Publication No. 2023 / 032832 International Publication No. 2023 / 032834

[0005] The present invention provides the following inventions: [1] An oil-in-water emulsion cosmetic comprising (A) iron oxide powder, (B) a surfactant, (C) an amphiphilic water-soluble polymer compound selected from the group consisting of alkyl polyacrylate derivatives and water-soluble alkyl-substituted polysaccharide derivatives, (D) an oil, and (E) water, wherein component (A) is hydrophobized and contained in emulsion particles, the content of component (A) is 0.75% by mass or more based on the total mass of the cosmetic, component (B) has an HLB of 8 or more, component (B) contains (b1) a non-silicone surfactant, the proportion of component (b1) based on the total mass of component (B) is 70% by mass or more, and (F) further comprises a polyglycerin fatty acid ester having three or more glyceryl groups and an HLB of less than 5. [2] The cosmetic according to [1], wherein the emulsion particles further comprise (G) titanium dioxide powder or zinc oxide powder. [3] The cosmetic composition according to [1] or [2], wherein component (B) is a nonionic surfactant. [4] The cosmetic composition according to any one of [1] to [3], wherein component (b1) is polyoxyethylene hydrogenated castor oil. [5] The cosmetic composition according to any one of [1] to [4], wherein component (C) is selected from the group consisting of alkyl-modified carboxyvinyl polymer, hydrophobically modified alkylcellulose, and hydrophobically modified sulfonated polysaccharide derivatives. [6] The cosmetic composition according to any one of [1] to [5], wherein component (D) contains a polar oil. [7] The cosmetic composition according to any one of [1] to [6], wherein component (F) is polyglyceryl-6 polyricinoleate. [8] A cosmetic composition according to any one of [1] to [7], comprising, based on the total mass of the components of the cosmetic composition, 0.05 to 10% by mass of component (B), 0.001 to 3% by mass of component (C), 3 to 50% by mass of component (D), and 0.001 to 5% by mass of component (F). [9] A cosmetic composition according to any one of [1] to [8], further comprising (H) a higher alcohol.

[10] A cosmetic composition according to any one of [1] to [9], further comprising (I) a water-soluble thickener.

[11] The cosmetic composition according to any one of [1] to

[10] , wherein when the cosmetic composition is diluted 10 times and observed under a microscope, the number of coarse particles with a particle diameter exceeding 30 μm in a field of view of 250 μm vertically and 300 μm horizontally is 3 or less.

[12] The cosmetic composition according to any one of [1] to

[11] , wherein the viscosity at 30°C, as measured using a B-type viscometer, is 20,000 mPa·s or less.

[0006] The present invention provides a cosmetic product that offers sufficient coverage while simultaneously providing excellent usability and superior storage stability. More specifically, it exhibits high coverage, a refreshing feel and excellent spreadability during use, and minimal color streaking even after long-term storage. Detailed description of the invention

[0007] The oil-in-water cosmetic composition according to the present invention (hereinafter sometimes referred to as "cosmetic composition") comprises (A) iron oxide powder, (B) a surfactant, (C) an amphiphilic water-soluble polymer compound selected from the group consisting of alkyl acrylates and water-soluble alkyl-substituted polysaccharide derivatives, (D) an oil component, and (E) water. Each of these components, and any further components that may be added, will be described below.

[0008] (A) Iron Oxide Powder The cosmetic composition according to the present invention comprises iron oxide powder (hereinafter sometimes referred to as component (A)). The iron oxide powder in the present invention has a hydrophobic surface treatment. Iron oxide powder is mainly used for coloring in cosmetics, and the average particle size of the powder used for coloring purposes is in the region of particle size in which Mie scattering occurs, specifically 100 nm to 1 μm. Therefore, it is preferable that component (A) used in the present invention is a pigment with an average particle size of 100 nm to 1 μm.

[0009] The iron oxide is preferably selected from the group consisting of red iron oxide, yellow iron oxide, and black iron oxide.

[0010] Furthermore, component (A) of the present invention has an iron oxide surface that has been hydrophobized. Because the iron oxide powder has been hydrophobized, it can stably exist in the emulsion particles contained in the oil-in-water cosmetic. The hydrophobizing surface treatment agent used for this hydrophobization treatment is not particularly limited, but examples include silicone treatment agents, fluorine compound treatment agents, amino acid treatment agents, fatty acid treatment agents, fatty acid soap treatment agents, fatty acid ester treatment agents, and others such as lecithin treatment agents and alkyl phosphate ester treatment agents.

[0011] Examples of silicone treatment agents include silicone oils such as methylhydrogenpolysiloxane, dimethylpolysiloxane, and methylphenylpolysiloxane; alkylsilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, and octyltrimethoxysilane; and fluoroalkylsilanes such as trifluoromethylethyltrimethoxysilane and heptadecafluorodecyltrimethoxysilane. Examples of fluorine compound treatment agents include perfluoroalkyl phosphate esters and perfluoroalcohols.

[0012] Examples of amino acid processing agents include N-acyl glutamic acid, N-acyl aspartic acid, and N-acyl lysine.

[0013] Examples of fatty acid treatment agents include palmitic acid, isostearic acid, stearic acid, lauric acid, myristic acid, behenic acid, oleic acid, rosinic acid, and 12-hydroxystearic acid.

[0014] Examples of fatty acid soap treatment agents include aluminum stearate, calcium stearate, and aluminum 12-hydroxystearate.

[0015] Examples of fatty acid ester treatment agents include dextrin fatty acid esters, cholesterol fatty acid esters, sucrose fatty acid esters, and starch fatty acid esters. These hydrophobic treatments can be carried out according to conventional methods.

[0016] Of these, surface treatment with an amino acid treatment agent is preferred from the viewpoint of improving the feel and powder dispersibility.

[0017] (A) In order to obtain the desired coverage, the content of component (A) must be 0.75% by mass or more, preferably 2.5% by mass or more, and more preferably 10% by mass or more, based on the total mass of the cosmetic.

[0018] Furthermore, the content of component (A) based on the total mass of the cosmetic product is preferably 30% by mass or less, more preferably 25% by mass or less, and particularly preferably 20% by mass or less. Caution is necessary because an excessively high content of component (A) tends to worsen storage stability.

[0019] (B) Surfactant The cosmetic composition according to the present invention comprises a surfactant (hereinafter sometimes referred to as component (B)). The surfactant in the present invention has an HLB (Hydrophile-Lipophile Balance) of 8 or higher. Here, HLB is calculated by the Griffin method. The HLB of component (B) is preferably 8 to 18, and more preferably 10 to 18.

[0020] Surfactants can generally be classified into (b1) non-silicone surfactants that do not contain a silicone structure and (b2) silicone surfactants that contain a silicone structure, according to their structure. In the present invention, it is preferable to contain a large amount of (b1) non-silicone surfactants. In the present invention, the ratio of the total mass of component (B) to the referenced component (b1) must be 70% by mass or more, preferably 85% by mass or more, and more preferably 99% or more. The cosmetic composition according to the present invention substantially does not contain vesicles or nanodiscs and contains general droplet-shaped emulsion particles.

[0021] Furthermore, surfactants can be classified into nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. In the present invention, any of these can be used, but the use of nonionic surfactants is preferred. When surfactants are used in combination, it is preferable that the proportion of nonionic surfactants is high, and most preferably, all of the surfactants are nonionic surfactants.

[0022] Specific examples of component (B) include, for example, those selected from the group consisting of polyoxyethylene hydrogenated castor oil, polyoxyethylene sterols, polyoxyethylene / polyoxyalkylene copolymers, polyglycerin fatty acid esters, and sorbitan fatty acid esters, which are classified as component (b1), and polyether-modified silicones, which are classified as component (b2). Of these, polyoxyethylene hydrogenated castor oil is preferably used.

[0023] Examples of hydrogenated polyoxyethylene castor oil include PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil, and PEG-100 hydrogenated castor oil.

[0024] Examples of polyoxyethylene sterols include PEG-30 phytosterol and PPG-7 / PEG-30 phytosterol. Examples of polyoxyethylene / polyoxyalkylene copolymers include PPG-2-deceth-12 and PPG-13 decyltetradeceth-24.

[0025] Examples of polyglycerol fatty acid esters include polyglyceryl oleate, polyglyceryl laurate, polyglyceryl myristate, polyglyceryl stearate, and polyglyceryl isostearate.

[0026] Examples of sorbitan fatty acid esters include sorbitan laurate, polysorbate 20, polysorbate 60, and polysorbate 80.

[0027] Furthermore, examples of polyether-modified silicones classified as component (b2) include PEG-12 dimethicone, PEG-10 dimethicone, and PEG-11 methyl ether dimethicone.

[0028] (B) The content of component (B) is preferably 0.05 to 10% by mass, and more preferably 1 to 5% by mass, relative to the total mass of the cosmetic.

[0029] (C) Amphiphilic water-soluble polymer compound The cosmetic composition according to the present invention comprises an amphiphilic water-soluble polymer compound (hereinafter sometimes referred to as component (C)). The amphiphilic water-soluble polymer compound in the present invention is selected from the group consisting of alkyl polyacrylate derivatives and water-soluble alkyl-substituted polysaccharide derivatives. Component (C) has the effect of stabilizing the emulsified state of the cosmetic composition. Although component (C) also exhibits a thickening effect, the water-soluble thickener (I) described later does not include this component (C).

[0030] Alkyl polyacrylate derivatives are water-soluble polymer compounds obtained by modifying polymers that have alkyl acrylates, such as acrylic acid or methyl acrylate, as polymerization units. Furthermore, water-soluble alkyl-substituted polysaccharide derivatives are water-soluble polymer compounds obtained by hydrophobizing polysaccharides such as cellulose to a degree that maintains sufficient water solubility.

[0031] Of these components (C), preferred ones are selected from the group consisting of alkyl-modified carboxyvinyl polymers, hydrophobic-modified alkylcelluloses, and polymers containing 2-acrylamido-2-methylpropanesulfonic acid (also called "acryloyldimethyltauric acid"; hereafter sometimes referred to as AMPS) or a salt thereof in their structure.

[0032] Alkyl-modified carboxyvinyl polymers are alkyl acrylate methacrylate copolymers, which are polymers in which at least a portion of the carboxyl groups of a polymer with acrylic acid or methacrylic acid as the main chain are esterified by alkyl groups. The alkyl groups linked by ester bonds may be linear or branched, and their carbon number is preferably 10 to 30, and more preferably 18 to 24. In the present invention, alkyl-modified carboxyvinyl polymers are preferably crosspolymers in which polymers or copolymers containing alkyl acrylate or alkyl methacrylate as polymerization units are crosslinked with each other. For example, acrylates / alkyl acrylate (C １０－３０ Crosspolymers are an example. Commercial alkyl-modified carboxyvinyl polymers include CARBOPOL 1342, CARBOPOL 1382 (both manufactured by Lubrizol Advanced Materials), Pemulene TR-1, Pemulene TR-2 (both manufactured by Lubrizol Advanced Materials), etc. Alkyl-modified carboxyvinyl polymers may be used individually or in combination of two or more types.

[0033] Hydrophobic modified alkylcellulose is a compound in which long-chain alkyl groups are attached to cellulose using alkyl group-introducing compounds that contain alkyl groups. This hydrophobic modified alkylcellulose is a compound in which a hydrophobic long-chain alkyl group, such as a C14-C22 alkyl group, is introduced to a water-soluble cellulose ether derivative, such as methylcellulose or ethylcellulose.

[0034] The weight-average molecular weight of the hydrophobic modified alkylcellulose is preferably 100,000 to 1,000,000, more preferably 300,000 to 800,000, and even more preferably 550,000 to 750,000.

[0035] Examples of commercially available hydrophobic modified alkylcellulose include Sanjelose 90L (indicated name: hydrophobic hydroxypropyl methylcellulose; manufactured by Daido Chemical Industries, Ltd.), Natrosol Plus 330cs (manufactured by Ashland), and Polysurf 67cs (manufactured by Ashland).

[0036] Polymers containing AMPS or a salt thereof in their structure are not particularly limited in the shape of the main structure of the polymer, but for example, (i) 2-acrylamido-2-methylsulfonic acid and (ii) vinylpyrrolidone, (meth)acrylamide, sodium (meth)acrylate, hydroxyethyl (meth)acrylate, POE(C) １０－１８ (C) is preferably a copolymer of one or more monomers selected from the group consisting of alkyl ether (meth)acrylates. Preferred specific examples of component (C) include (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer and polymers consisting of tara gum and AMPS.

[0037] (Acryloyldimethyltaurate ammonium / methacrylate beheneth-25) crosspolymer is commercially available as "Aristoflex HMB" (manufactured by Clariant Japan), etc., and polymers consisting of tara gum and AMPS are commercially available as "Aristoflex Eco T" (manufactured by Clariant Japan), etc., and these can be suitably used. Component (C) can be used alone or in combination of two or more.

[0038] The content of component (C) is preferably 0.001 to 3% by mass, and more preferably 0.01 to 2% by mass, relative to the total mass of the cosmetic.

[0039] (D) Oil component The oil-in-water cosmetic composition according to the present invention comprises an oil component that constitutes the oil phase (hereinafter sometimes referred to as component (D)). Component (D) can be broadly classified into polar oils and non-polar oils.

[0040] Examples of polar oils include ester oils, higher fatty acids, and higher aliphatic alcohols.

[0041] As ester oils, for example, octyl octanoate, nonyl nonanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl / decyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12 - hydroxystearate, ethylene glycol di - 2 - ethylhexanoate, N - alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, cetyl 2 - ethylhexanoate - 2 - ethylhexyl palmitate, methyl ester of castor oil fatty acid, oleyl oleate, acetoglyceride, 2 - heptylundecyl palmitate, diisobutyl adipate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di - 2 - heptylundecyl adipate, ethyl laurate, di - 2 - ethylhexyl sebacate, 2 - hexyldecyl myristate, 2 - hexyldecyl palmitate, 2 - hexyldecyl adipate, diisopropyl sebacate, 2 - ethylhexyl succinate, triethyl citrate, cetyl ethylhexanoate, phytosteryl macadamia nut fatty acid, tocopherol acetate, etc. can be mentioned.

[0042] As higher fatty acids, for example, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall oil acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), etc. can be mentioned.

[0043] As non - polar oil components, for example, hydrocarbon oils, silicone oils, etc. can be mentioned.

[0044] As hydrocarbon oils, paraffin, squalane, squalene, isocetane, isododecane, hydrogenated polydecene, hydrogenated isopolybutene, petrolatum, etc. can be mentioned.

[0045] Examples of silicone oils include chain silicone oils such as dimethicone, methylphenylpolysiloxane, caprylyl methyl silicone, diphenylsiloxyphenyltrimethicone, methylhydrogenpolysiloxane, and trimethylsiloxysilicic acid, and cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0046] In the present invention, the higher alcohol (H) described later is not included in the oil component.

[0047] The component (D) used in the present invention may be either a polar oil or a non-polar oil, or a mixture thereof may be used, but it is preferably included a polar oil. Further, an ester oil is preferably used as the polar oil.

[0048] In the present invention, the content of the component (D) is preferably 3 to 50% by mass, more preferably 5 to 30% by mass, based on the total mass of the cosmetic.

[0049] (E) Water The water-in-oil type cosmetic according to the present invention contains an aqueous phase and an oil phase. And it contains water (hereinafter sometimes referred to as component (E)) as a component of the aqueous phase. As the water, water generally used in cosmetics can be used, for example, purified water, ion-exchanged water, tap water, etc. can be used.

[0050] (F) Polyglycerin fatty acid ester The cosmetic according to the present invention contains a polyglycerin fatty acid ester (hereinafter sometimes referred to as component (F)). The polyglycerin fatty acid ester in the present invention is an esterification product of polyglycerin in which 3 or more glycerin molecules are condensed and polymerized and a fatty acid, and has an HLB of less than 5.

[0051] Specific examples of component (F) that can be used in cosmetics according to the present invention include: Polyglyceryl-3 diisostearate, Polyglyceryl-3 distearate, Polyglyceryl-4 caprate, Polyglyceryl-4 oleate, Polyglyceryl-4 tristearate, Polyglyceryl-4 pentaoleate, Polyglyceryl-4 pentastearate, Polyglyceryl-4 polyricinoleate, Polyglyceryl-6 laurate, Polyglyceryl-6 myristate, Polyglyceryl-6 stearate, Polyglyceryl-6 oleate, Polyglyceryl-6 caprylate, Polyglyceryl-6 dicaprate, Polyglyceryl-6 dioleate, Polyglyceryl-6 tristearate, Polyglyceryl-6 tetrabehenate, Polyglyceryl-6 pentastearate, Polyglyceryl-6 pentaoleate, Polyglyceryl-6 polyricinoleate, Polyglyceryl-6 polyhydroxystearate, Polyglyceryl-10 laurate, Polyglyceryl-10 myristate, Polyglyceryl-10 stearate, Polyglyceryl-10 isostearate, Polyglyceryl-10 oleate, Polyglyceryl-10 linoleate, Polyglyceryl-10 distearate, Polyglyceryl-10 diisostearate, Polyglyceryl-10 pentastearate, Glyceryl-10 pentaisostearate, Polyglyceryl-10 pentahydroxystearate, Polyglyceryl-10 pentaoleate, Polyglyceryl-10 heptastearate, Polyglyceryl-10 heptastearate, Polyglyceryl-10 decastearate, Polyglyceryl-10 decaisostearate Examples include polyglyceryl-10 decaethylhexanoate, polyglyceryl-10 decaoleate, polyglyceryl-10 decamademia nut fatty acid, polyglyceryl-10 hept(behenate / stearic acid), polyglyceryl-10 dodecabehenate, and polyglyceryl-10 polyricinoleate. Among these, polyglyceryl-6 polyricinoleate is preferred.It is also possible to use a commercially available product as component (F) above. Examples of commercially available products include SY Glister CRS-75 (manufactured by Sakamoto Pharmaceutical Co., Ltd.) and Emulium® Illustro (manufactured by Gatfossé).

[0052] In the present invention, the content of component (F) is preferably 0.05 to 5% by mass, and more preferably 0.1 to 2% by mass, based on the total mass of the cosmetic composition.

[0053] (G) Titanium dioxide powder or zinc oxide powder The cosmetic composition according to the present invention contains the above-mentioned components (A) to (F) as essential components, but may contain other components as needed. One such component is titanium dioxide powder or zinc oxide powder (hereinafter sometimes referred to as component (G)). Component (G) can improve the coverage of the cosmetic and also improve the UV protection effect.

[0054] The titanium dioxide powder or zinc oxide powder that can also be used in the cosmetics of the present invention includes not only pigment-grade powders used as white pigments, but also fine-particle titanium dioxide and fine-particle zinc oxide with small average particle sizes.

[0055] In the present invention, the content of component (G) is preferably 1 to 30% by mass, and more preferably 5 to 20% by mass, based on the total mass of the cosmetic composition.

[0056] (H) Higher alcohol The cosmetic composition according to the present invention may further contain a higher alcohol (hereinafter sometimes referred to as component (H)).

[0057] Examples of component (H) include linear alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.) and branched-chain alcohols (e.g., lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.).

[0058] Component (H), together with the surfactant described above, can form a lamellar gel with an α-type structure, thereby improving the stability of cosmetics.

[0059] In the present invention, the content of component (H) is preferably 0.1 to 5% by mass, and more preferably 0.5 to 3% by mass, based on the total mass of the cosmetic composition.

[0060] (I) Water-soluble thickener The cosmetic composition according to the present invention may further contain a water-soluble thickener (hereinafter sometimes referred to as component (I)). The water-soluble thickener can be used to adjust the viscosity of the cosmetic composition. The thickener is not particularly limited and can be any thickener that is normally usable in cosmetic compositions. Examples include: plant-derived polymers such as gum arabic, tragacanth gum, galactan, guar gum, carrageenan, pectin, quince seed extract, brown algae powder, and agar; microbial polymers such as hyaluronic acid, sodium hyaluronate, xanthan gum, dextran, and pullulan; starches such as starch, carboxymethyl starch, and methylhydroxy starch; celluloses such as methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, cellulose sulfate, hydroxypropylcellulose, carboxymethylcellulose, crystalline cellulose, and cellulose powder; vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, and carboxyvinyl polymer; acrylic polymers such as polyacrylic acid and its salts, and polyacrylimide; hydrophobic modified polyether urethanes such as PEG-240 / decyltetradeceth-20 / hexamethylene diisocyanate copolymer; and glycyrrhizic acid, alginic acid, and its salts.

[0061] The preferred amount of the water-soluble thickener in the cosmetic composition according to the present invention is preferably 0.01 to 3% by mass, and more preferably 0.05 to 1% by mass, based on the total mass of the cosmetic composition.

[0062] The cosmetic composition according to the present invention may, as necessary and insofar as it does not impair the effects of the present invention, contain other components besides the above-mentioned components, such as humectants, lower alcohols, powders, film-forming agents, oil-soluble ultraviolet absorbers, water-soluble ultraviolet absorbers, metal ion chelating agents, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, etc.

[0063] The cosmetic composition according to the present invention is an oil-in-water cosmetic composition and generally has a liquid dosage form. The viscosity of this cosmetic composition at 30°C, as measured using a B-type viscometer, is preferably 20,000 mPa·s or less, and more preferably 10,000 mPa·s or less.

[0064] Furthermore, the cosmetic composition according to the present invention has excellent uniformity and is characterized by a small number of coarse particles present in the cosmetic composition. In a preferred embodiment, the number of coarse particles with a particle diameter exceeding 30 μm contained in 0.2 μL of the cosmetic composition after being left to stand at 50°C for one month after production is 3 or less. This number of coarse particles was measured by diluting the sample 10-fold after being left to stand at 50°C for one month after production, spreading 2 μL of the mixture onto an 18 mm × 18 mm glass slide, and observing the entire area with an optical microscope to measure the number of coarse particles with a particle diameter exceeding 30 μm. The average number of coarse particles is typically 3 or less, more preferably 2 or less, and particularly preferably none at all. The magnification of the microscope is not necessarily specified, but generally 100x to 1000x, for example 400x, is appropriate for observation.

[0065] The cosmetic composition according to the present invention can be, for example, a makeup cosmetic (e.g., foundation, makeup base, etc.), a skincare cosmetic (e.g., lotion, emulsion, cream, serum, mask, etc.), a sunscreen cosmetic, an ointment, etc.

[0066] The cosmetic composition of the present invention can be manufactured by any conventionally known method. The emulsification method for obtaining an oil-in-water cosmetic composition is not particularly limited and can be manufactured according to conventional methods.

[0067] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is expressed as mass % of the total amount.

[0068] [Examples 1-8, Comparative Examples 1-13] Cosmetics for each example and comparative example were prepared using the formulations shown in Table 1.

[0069] Furthermore, the performance of these cosmetics was evaluated as follows.

[0070] <Coverage> Five expert panelists conducted a sensory evaluation of the coverage of each oil-in-water emulsion cosmetic (foundation) after applying it to the skin by hand, based on the following criteria: (Evaluation Criteria) A: Effectively covers uneven skin tone. B: Covers uneven skin tone. C: Slightly covers uneven skin tone. D: Does not cover uneven skin tone very well. E: Does not cover uneven skin tone.

[0071] <Color Stripes> After placing the cosmetic in a glass bottle, placing the bottle horizontally, and rotating it at 45 revolutions per minute for 4 hours, the appearance and bulk were visually observed and evaluated according to the following criteria. Here, color stripes refer to lines or uneven color of the cosmetic that are different in color from the color of the cosmetic before the rotation process, which are caused by the rotation process. (Evaluation Criteria) A: No color stripes are observed, or there are slight color stripes in a narrow area. B: There are faint color stripes in a narrow area. C: There are faint color stripes in a wide area. D: There are clear color stripes in a wide area, and the color of the cosmetic before and after the rotation process is slightly different. E: There are clear color stripes throughout, and the color of the cosmetic before and after the rotation process is clearly different.

[0072] <Thickening> The cosmetic product was placed in a glass bottle and stored at 50°C for one month. The bulk was then visually inspected and evaluated according to the following criteria: (Evaluation Criteria) A: No thickening or gelation observed B: Slight thickening observed C: Slight tendency towards gelation observed D: Gelation observed E: Significant gelation observed

[0073] <Coarse Particles> The cosmetic was placed in a glass bottle, stored at 50°C for one month, then diluted 10-fold. 2 μL of this solution was spread onto an 18 mm x 18 mm glass slide, and the entire area was observed with an optical microscope to measure the number of coarse particles with a particle diameter exceeding 30 μm. (Evaluation Criteria) A: The number of coarse particles is 3 or less. B: The number of coarse particles is 4 or more.

[0074]

[0075]

[0076] [Examples 9-18, Comparative Examples 14-15] Cosmetics for each example and comparative example were prepared using the formulations shown in Table 2.

[0077] Furthermore, the performance of these cosmetics was evaluated. Coverage, color streaks, thickness, and coarse emulsion particles were evaluated using the same criteria as in the examples. Freshness, lack of powderiness or stickiness, and spreadability were evaluated using the following criteria.

[0078] <Moisture> Five expert panelists conducted a sensory evaluation of the moisture content of each oil-in-water emulsion cosmetic (foundation) after spreading it on the skin by hand, using the following criteria: A: Very moisturizing B: Moisturizing C: Slightly moisturizing D: Not moisturizing E: Not moisturizing at all

[0079] <Powdery and non-sticky feel> Five expert panelists conducted a sensory evaluation of each oil-in-water emulsion cosmetic (foundation) after spreading it on the skin by hand, based on the following criteria: Evaluation Criteria) A: Not powdery or non-sticky at all B: Not powdery or non-sticky C: Slightly powdery or non-sticky D: Powdery or non-sticky E: Very powdery or non-sticky

[0080] <Spreadability> Five expert panelists conducted a sensory evaluation of the spreadability of each oil-in-water emulsion cosmetic (foundation) after applying it to the skin by hand, based on the following criteria: (Evaluation Criteria) A: Spreads very well B: Spreads well C: Spreads somewhat well D: Spreads poorly E: Spreads very poorly

[0081]

[0082] The following are examples of suitable formulations for cosmetics according to the present invention. The amounts are expressed in mass percent.

[0083]

[0084]

[0085]

[0086]

[0087]

[0088]

Claims

(A) Iron oxide powder, (B) Surfactants, (C) an amphiphilic water-soluble polymer compound selected from the group consisting of alkyl polyacrylate derivatives and water-soluble alkyl-substituted polysaccharide derivatives, (D) Oils, and (E) Water An oil-in-water emulsion cosmetic comprising, (A) The component has been hydrophobized and is contained in the emulsion particles, (A) The content of component based on the total mass of the cosmetic composition is 0.75% by mass or more. (B) The HLB of component is 8 or higher. (B) component contains (b1) a non-silicone surfactant, and the proportion of component (b1) based on the total mass of component (B) is 70% by mass or more, (F) A cosmetic composition further comprising a polyglycerin fatty acid ester having three or more glyceryl groups and having an HLB of less than 5. 　 The cosmetic composition according to claim 1, wherein the emulsified particles further comprise (G) titanium dioxide powder or zinc oxide powder. 　 (B) The cosmetic composition according to claim 1 or 2, wherein component (B) is a nonionic surfactant. 　 (b1) The cosmetic composition according to claim 1 or 2, wherein the component is polyoxyethylene hydrogenated castor oil. 　 The cosmetic composition according to claim 1 or 2, wherein component (C) is selected from the group consisting of alkyl-modified carboxyvinyl polymers, hydrophobically modified alkylcelluloses, and hydrophobically modified sulfonated polysaccharide derivatives. 　 (D) The cosmetic composition according to claim 1 or 2, wherein component (D) comprises a polar oil. 　 The cosmetic composition according to claim 1 or 2, wherein component (F) is polyglyceryl-6 polyricinoleate. 　 Based on the total mass of the ingredients in the aforementioned cosmetic, (B) Component 0.05 to 10% by mass, (C) Component 0.001 to 3% by mass, (D) Component 3 to 50% by mass, (F) Component is 0.001 to 5% by mass, A cosmetic composition comprising the cosmetic composition according to claim 1 or 2. 　 (H) The cosmetic composition according to claim 1 or 2, further comprising a higher alcohol. (I) The cosmetic composition according to claim 1 or 2, further comprising a water-soluble thickener. 　 The cosmetic composition according to claim 1 or 2, wherein the number of coarse particles with a particle size exceeding 30 μm contained in 0.2 μL of the cosmetic composition after being left to stand at 50°C for one month after manufacturing is 3 or less. 　 The cosmetic composition according to claim 1 or 2, wherein the viscosity at 30°C, as measured using a B-type viscometer, is 20,000 mPa·s or less.

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