Oil-in-water emulsion cosmetic

Abstract

To provide an oil-in-water emulsion cosmetic that achieves good finger slip, allows smooth spreading upon application to skin, enables uniform adhesion to skin, and exhibits excellent color unevenness covering performance.SOLUTION: An oil-in-water emulsion cosmetic contains the following components (A), (B), and (C): (A) silica-treated titanium dioxide or zinc oxide that is substantially free of aluminum, (B) a nonionic surfactant containing at least (B1) a polyoxyethylene sorbit fatty acid ester having a fatty acid with 16 to 22 carbon atoms, and (C) an anionic surfactant.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic. [Background technology]

[0002] Oil-in-water emulsion cosmetics are widely used because of their fresh feel and excellent texture. For example, Patent Document 1 describes that by blending a specific ester oil and a specific silicone oil in a specific ratio with an oil-in-water emulsion cosmetic containing a hydrophobically treated color pigment and octyl paramethoxycinnamate, the occurrence of color loss during production is suppressed and the cosmetic has excellent storage stability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-99485 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional oil-in-water emulsion cosmetics have had issues such as being rough on the fingers, having a poor feel when used, and being prone to uneven application. [Means for solving the problem]

[0005] The present inventors have discovered that by using a combination of a specific nonionic surfactant and an anionic surfactant together with a specific treated titanium oxide or zinc oxide, it is possible to obtain an oil-in-water emulsion cosmetic that spreads smoothly when applied to the skin, adheres evenly to the skin, and has excellent ability to cover uneven skin tone.

[0006] The present invention comprises the following components (A), (B) and (C): (A) a substantially aluminum-free silica-treated titanium oxide or zinc oxide; (B) a nonionic surfactant containing at least (B1) a polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms; (C) Anionic surfactants The present invention relates to an oil-in-water emulsion cosmetic comprising the above-mentioned component (I). [Effects of the Invention]

[0007] The oil-in-water emulsion cosmetic of the present invention has good finger spreadability, spreads smoothly when applied to the skin, adheres evenly to the skin, and has excellent ability to cover uneven skin tone. DETAILED DESCRIPTION OF THE INVENTION

[0008] Component (A) used in the present invention is a silica-treated titanium oxide or zinc oxide that is substantially free of aluminum. Titanium oxide and zinc oxide are generally sold commercially with aluminum present in the crystal lattice during production or coated with aluminum hydroxide or alumina, for the purpose of suppressing discoloration over time due to photocatalytic action. In the present invention, to avoid such effects of aluminum, titanium oxide and zinc oxide are used that contain substantially no aluminum not only on the surface but also in the crystal lattice. This is due to the metal salts formed between the aluminum used as a coating agent for titanium oxide and zinc oxide, and the aluminum ions eluted from titanium oxide and zinc oxide, and the carboxylic acid groups of the anionic surfactant, which cause poor appearance and properties of cosmetics. Titanium oxide has two crystal types, anatase type and rutile type, and either type may be used.

[0009] The titanium oxide and zinc oxide in component (A) are coated with silica, and the silica treatment prevents the aggregation of not only the titanium oxide and zinc oxide but also other color pigments, allowing the pigments to adhere uniformly to the skin. The silica used for surface treatment may be crystalline or amorphous. The method for surface-treating silica is not particularly limited, and any conventional method can be used, such as a method of adding silica sol to an aqueous suspension of titanium oxide or zinc oxide to precipitate silica on the surface of the titanium oxide or zinc oxide, or a mechanochemical reaction method of wet- or dry-mixing and grinding titanium oxide or zinc oxide as a core material with silica. The amount of silica to be treated is preferably 1 to 20 mass % relative to the amount of titanium oxide and zinc oxide, and more preferably 2 to 15 mass %.

[0010] The titanium oxide and zinc oxide of component (A) may be subjected to a hydrophobic treatment in combination with a compound other than silica, which can be carried out according to a conventional method, such as a dry treatment or a wet treatment, to coat the surface of the color pigment. Examples of hydrophobic treatments other than those using silica include surface treatments such as silicone treatment, alkyl treatment, alkylalkoxysilane treatment, metal soap treatment, water-soluble polymer treatment, amino acid treatment, acylated amino acid treatment, lecithin treatment, alkoxytitanium alkylate treatment, glycerin fatty acid ester treatment, polyol treatment, acrylic resin treatment, methacrylic resin treatment, and urethane resin treatment. Among these, amino acid treatment, acylated amino acid treatment, alkoxytitanium alkylate treatment, alkylalkoxysilane treatment, and glycerin fatty acid ester treatment are preferred, and it is more preferred to include one or more treatments selected from the amino acid treatment and the acylated amino acid treatment, and it is even more preferred to include the acylated amino acid treatment.

[0011] Examples of amino acids include proline, hydroxyproline, alanine, glycine, sarcosine, lysine, aspartic acid, glutamic acid, etc., and salts thereof are also included. Furthermore, the fatty acid constituting the acyl group of the acylated amino acid is preferably a fatty acid having 1 to 23 carbon atoms, more preferably a fatty acid having 8 to 20 carbon atoms, and among these, stearoyl glutamic acid, cocoyl glutamic acid, lauroyl aspartic acid, dilauroyl glutamic acid lysine, and lauroyl lysine are even more preferred. Examples of salts thereof include Na, Ca, Al, Mg, Zn, Zr, and Ti salts. Specifically, from the viewpoint of uniform adhesion to the skin, those treated with disodium stearoyl glutamate, sodium lauroyl aspartate, or disodium cocoyl glutamate are preferred, and those treated with disodium stearoyl glutamate or sodium lauroyl aspartate are more preferred.

[0012] The total amount of component (A) used for surface treatment is preferably 1 to 20 mass %, more preferably 2 to 15 mass %, based on titanium oxide and zinc oxide.

[0013] Component (A) can be used alone or in combination of two or more, and titanium oxide and zinc oxide can also be used in combination. From the viewpoints of good finger feel, uniform adhesion to the skin, and excellent ability to cover uneven skin tone, the content of component (A) is preferably 0.1% by mass or more of the total composition, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 18% by mass or less, and even more preferably 11% by mass or less. The content of component (A) is preferably 0.1 to 30% by mass of the total composition, more preferably 0.5 to 25% by mass, even more preferably 1 to 18% by mass, and even more preferably 2 to 11% by mass.

[0014] Component (B) is a nonionic surfactant and contains at least (B1) a polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms. The nonionic surfactant may be any surfactant commonly used in cosmetics, and examples thereof include sorbitan fatty acid esters such as sorbitan monoisostearate, sorbitan monooleate, sorbitan sesquistearate, and sorbitan sesquioleate; polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, glycerin fatty acid esters, diglycerin fatty acid esters, propylene glycol fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyethylene glycol fatty acid esters, polyethylene glycol dipolyhydroxystearate, alkyl glyceryl ethers, alkyl polyglyceryl ethers, polyoxyethylene alkyl ethers, polyoxyethylene alkyl ether fatty acid esters, polyoxyethylene alkylamines; polyether-modified silicones such as polyoxyethylene-methylpolysiloxane copolymers and poly(oxyethylene-oxypropylene)methylpolysiloxane copolymers; and silicone surfactants such as polyglycerin-modified silicones, alkyl-modified polyether-modified silicones, and alkyl chain-co-modified polyether-modified silicones.

[0015] The nonionic surfactant of component (B) preferably has an HLB value of 6.5 to 10, more preferably 7.3 to 9, from the viewpoint of improving dispersibility. Here, HLB (Hydrophilic-Lipophilic Balance) indicates the molecular weight of the hydrophilic group portion relative to the total molecular weight of the surfactant, and is calculated using Griffin's equation. Furthermore, when a surfactant is composed of two or more nonionic surfactants, the HLB of the mixed surfactant is calculated as follows: The HLB of the mixed surfactant is the arithmetic average of the HLB values ​​of each nonionic surfactant based on their blending ratio. Mixed HLB=Σ(HLBx×Wx) / ΣWx HLBx indicates the HLB value of nonionic surfactant X. Wx represents the mass (g) of the nonionic surfactant X having the value of HLBx.

[0016] The nonionic surfactant preferably includes one or more selected from glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters.

[0017] Component (B) contains at least (B1) a polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms, which holds emulsified oil droplets and exists in a continuous layer of an oil-in-water emulsion, resulting in excellent finger feel and smooth spread when applied to the skin. In the polyoxyethylene sorbite fatty acid ester of component (B1), the fatty acid has a carbon number of 16 to 22, preferably 16 to 18. The fatty acid may be a wax ester, more preferably beeswax. As component (B1), polyoxyethylene sorbitan beeswax is preferred. Polyoxyethylene sorbitan beeswax is a component obtained by reacting beeswax with polyoxyethylene sorbitol, which is obtained by addition polymerization of ethylene oxide to sorbitol. For example, commercially available products such as NIKKOL GBW-25 (manufactured by Nikko Chemicals Co., Ltd., number of moles of ethylene oxide added: 6, HLB: 7.5) and NIKKOL GBW-125 (manufactured by Nikko Chemicals Co., Ltd., number of moles of ethylene oxide added: 20, HLB: 9.5) can be used.

[0018] The content of component (B1) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 5% by mass or less, and even more preferably 3% by mass or less, based on the viewpoint that the component (B1) is present in a continuous layer of the oil-in-water emulsion, enveloping the emulsified oil droplets, and thus providing excellent finger comfort and smooth spreadability upon application to the skin. The content of component (B1) is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, even more preferably 0.5 to 5% by mass, and even more preferably 1 to 3% by mass.

[0019] Component (B) contains component (B1), and one or more of them can be used in combination. From the viewpoint of forming an oil-in-water emulsion, the content is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, and more preferably 2% by mass or more, based on the total composition. The above is even more preferable, and 30% by mass or less is preferable, 20% by mass or less is more preferable, 12% by mass or less is even more preferable, and 8% by mass is even more preferable. The content of component (B) in the total composition is preferably 0.1 to 30% by mass, more preferably 0.5 to 20% by mass, more preferably 1 to 12% by mass, and even more preferably 2 to 8% by mass.

[0020] In the present invention, the mass ratio (A) / (B1) of component (A) to component (B1) is preferably 0.2 or more, more preferably 0.5 or more, even more preferably 1 or more, preferably 10 or less, more preferably 8 or less, and even more preferably 6 or less, from the viewpoints of suppressing pigment aggregation, forming a rich-feeling oil-in-water emulsion, and thereby providing good finger feel, smooth spreadability when applied to the skin, uniform adhesion to the skin, and excellent ability to cover uneven skin tone. Furthermore, the mass ratio (A) / (B1) of component (A) to component (B1) is preferably 0.2 to 10, more preferably 0.5 to 8, and even more preferably 1 to 6.

[0021] In the present invention, the mass ratio (B1) / (B) of component (B1) to component (B) is preferably 0.15 or more, more preferably 0.2 or more, even more preferably 0.25 or more, and preferably 0.7 or less, more preferably 0.5 or less, and even more preferably 0.4 or less, from the viewpoints of suppressing pigment aggregation, forming a rich-feeling oil-in-water emulsion, and thereby providing good finger feel, smooth spreadability upon application to the skin, uniform adhesion to the skin, and excellent ability to cover uneven skin tone. Furthermore, the mass ratio (B1) / (B) of component (B1) to component (B) is preferably 0.15 to 0.7, more preferably 0.2 to 0.5, and even more preferably 0.25 to 0.4.

[0022] Examples of the anionic surfactant of component (C) include those used in ordinary cosmetics, such as (C1) polyoxyalkylene alkyl ether carboxylic acid or a salt thereof, (C2) alkyl sulfuric acid or a salt thereof, or polyoxyalkylene alkyl ether sulfuric acid or a salt thereof, (C3) acylated amino acid or a salt thereof, (C4) fatty acid or a salt thereof, (C5) N-acylalkyltaurine or a salt thereof, as well as polyoxyalkylene alkenyl ether sulfate or a salt thereof, sulfosuccinic acid alkyl ester or a salt thereof, polyoxyalkylene sulfosuccinic acid alkyl ester or a salt thereof, α-olefin sulfonic acid or a salt thereof, and the like. Of these, from the viewpoints of good finger application and smooth spreadability when applied to the skin, it is preferable to contain one or more types selected from (C3) acylated amino acids or salts thereof, (C4) fatty acids or salts thereof, and (C5) N-acylalkyltaurines or salts thereof, and it is more preferable to contain one or more types selected from (C3) acylated amino acids or salts thereof, and (C4) fatty acids or salts thereof.

[0023] (C3) The acylated amino acid or a salt thereof includes, for example, an acylated amino acid represented by the general formula (1)

[0024] [ka]

[0025] (In the formula, R 1 represents a linear or branched alkyl or alkenyl group having 7 to 21 carbon atoms, and R 2 represents a hydrogen atom or an alkyl or alkenyl group having 1 to 4 carbon atoms, and R 3 is a hydrogen atom or -(CH2) q R 4 (R 4 represents a hydrogen atom, a hydroxyl group or -COOM, q represents 0 to 3, and M represents a hydrogen atom, an alkali metal or an alkanolamine. Preferred is an N-acylamino acid salt represented by the following formula:

[0026] In general formula (1), R 1 As R, an alkyl group having 6 to 18 carbon atoms is preferred, and an alkyl group having 10 to 16 carbon atoms is more preferred. 2 R is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group. 3 Examples include hydrogen atoms, -(CH2) q R 4 Preferably, M is an alkali metal.

[0027] Specific examples of N-acylamino acid salts represented by general formula (1) include N-acylglycine salts such as N-cocoylglycine salt and N-lauroyl-N-methylglycine salt; N-acylglutamates such as N-lauroylglutamate and N-myristoylglutamate; N-acylalanine salts such as N-lauroyl-β-alanine salt and N-myristoyl-β-alanine salt; N-acylaspartates such as N-lauroylaspartate; and N-acylserine salts such as N-lauroylserine salt, as well as alkali metal salts thereof such as sodium and potassium; and alkanolamine salts such as monoethanolamine, diethanolamine, and triethanolamine. The compounds represented by general formula (1) may be L-, D-, or racemic, and any of these may be used in the present invention. Of these, N-acylglycine salts and N-acylglutamates are preferred from the viewpoints of ease of application to the fingers and smooth spreadability when applied to the skin.

[0028] (C4) fatty acids or salts thereof include fatty acids having 10 to 22 carbon atoms or salts thereof. The fatty acid having 10 to 22 carbon atoms or its salt preferably contains a fatty acid having a linear or branched alkyl group having 10 to 18 carbon atoms, from the viewpoint of providing a good feel on the fingers and a smooth spreadability when applied to the skin. Specific examples include laurate, myristate, palmitate, stearate, and behenate. These salts preferably contain one or more selected from alkali metals and ammonium, more preferably one or more selected from alkali metals, and even more preferably sodium salts and potassium salts.

[0029] As the (C5) N-acylalkyltaurine or a salt thereof, an N-acylmethyltaurine salt having 8 to 18 carbon atoms is more preferred.

[0030] Component (C) can be used alone or in combination of two or more, and from the viewpoint of providing a pleasant feel on the fingers and a smooth spread when applied to the skin, the content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.4% by mass or more, even more preferably 1% by mass or more, and preferably 10% by mass or less, more preferably 7% by mass or less, even more preferably 4% by mass or less, and even more preferably 2.5% by mass or less, based on the total composition. The content of component (C) is preferably 0.01 to 10% by mass, more preferably 0.1 to 7% by mass, even more preferably 0.4 to 4% by mass, and even more preferably 1 to 2.5% by mass.

[0031] In the present invention, the mass ratio (B1) / (C) of component (B1) to component (C) is preferably 0.2 or more, more preferably 0.5 or more, even more preferably 0.8 or more, and preferably 5 or less, more preferably 3 or less, and even more preferably 1.6 or less, from the viewpoints of suppressing pigment aggregation, forming a rich-feeling oil-in-water emulsion, and thereby providing good finger feel, smooth spreadability upon application to the skin, uniform adhesion to the skin, and excellent ability to cover uneven skin tone.Furthermore, the mass ratio (B1) / (C) of component (B1) to component (C) is preferably 0.2 to 5, more preferably 0.5 to 3, and even more preferably 0.8 to 1.6.

[0032] In the present invention, the mass ratio (A) / [(B1)+(C)] of component (A) to the total amount of component (B1) and component (C) is preferably 0.2 or more, more preferably 0.4 or more, even more preferably 0.5 or more, even more preferably 0.6 or more, preferably 5 or less, more preferably 4 or less, even more preferably 3.5 or less, and even more preferably 2.8 or less, from the viewpoints of suppressing pigment aggregation, forming a rich-feeling oil-in-water emulsion, smooth spread when applied to the skin, uniform adhesion to the skin, and excellent uneven skin tone coverage. Furthermore, the mass ratio (A) / [(B1)+(C)] of component (A) to the total amount of component (B1) and component (C) is preferably 0.2 to 5, more preferably 0.4 to 4, even more preferably 0.5 to 3.5, and even more preferably 0.6 to 2.8.

[0033] The oil-in-water emulsion cosmetic of the present invention may further contain an oil that is liquid at 25°C. Being liquid at 25°C means that the cosmetic has fluidity at 25°C. Such liquid oils are not limited as long as they are those commonly used in cosmetics, and examples thereof include hydrocarbon oils, ester oils, ether oils, silicone oils, and higher alcohols. More specifically, examples of hydrocarbon oils include liquid paraffin, light isoparaffin, liquid isoparaffin, squalane, squalene, and α-olefin oligomers.

[0034] The ester oil includes monoester oil, diester oil and triester oil, and does not include the organic ultraviolet absorbers described below. Examples of monoester oils include monoesters of aliphatic or aromatic monocarboxylic or dicarboxylic acids having 2 to 24 carbon atoms, and monofatty acid esters of trihydric alcohols. Specific examples include cetyl 2-ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, octyldodecyl myristate, 2-hexyldecyl myristate, isopropyl palmitate, octyl palmitate, isocetyl stearate, isostearyl isostearate, 2-ethylhexyl hydroxystearate, and alkyl benzoates (C12 to C15).

[0035] Examples of diester oils include diesters of dicarboxylic acids having 3 to 18 carbon atoms and difatty acid esters of polyhydric alcohols. Specific examples include propylene glycol dicaprylate, neopentyl glycol dicaprate, glyceryl diisostearate, polyglyceryl diisostearate, glyceryl monomyristate monoisostearate, di-2-ethylhexyl succinate, diisopropyl sebacate, diisostearyl malate, neopentyl glycol di-2-ethylhexanoate, diisobutyl adipate, diisopropyl adipate, diethyl sebacate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and dicaprylyl carbonate.

[0036] Triester oils include tri-fatty acid esters of trivalent or higher polyhydric alcohols, and specific examples include tri(caprylic / capric)glyceryl, tri-2-ethylhexanoate, glyceryl triisostearate, and vegetable oils such as olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, rice bran oil, evening primrose oil, almond oil, argania spinosa kernel oil, grape seed oil, hazelnut oil, rosehip oil, persic oil, and camellia oil.

[0037] The ether oils include dialkyl ethers, and specific examples thereof include dihexyl ether, dicaprylyl ether, and cetyl-1,3-dimethylbutyl ether.

[0038] Examples of silicone oils include crosslinked methylpolysiloxane, network methylpolysiloxane, methylpolysiloxane, methyltrimethicone, dimethylcyclopolysiloxane, methylphenylpolysiloxanes such as diphenylsiloxyphenyltrimethicone, and higher alcohol-modified organopolysiloxanes. Examples of volatile silicone oils include linear methylpolysiloxanes such as methylpolysiloxane (1cs), methylpolysiloxane (1.5cs), and methylpolysiloxane (2cs); branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0039] Examples of higher alcohols include those having a linear or branched alkyl or alkenyl group having 10 to 24 carbon atoms, such as lauryl alcohol, myristyl alcohol, isocetyl alcohol, isostearyl alcohol, 2-octyldodecanol, and oleyl alcohol.

[0040] The oil agent that is liquid at 25°C can be used alone or in combination of two or more, and from the viewpoint of forming an oil-in-water emulsion, the content is preferably 1% by mass or more of the total composition, more preferably 3% by mass or more, even more preferably 5% by mass or more, preferably 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less. The content of the oil agent that is liquid at 25°C is preferably 1 to 30% by mass of the total composition, more preferably 3 to 25% by mass, and even more preferably 5 to 20% by mass.

[0041] The oil-in-water emulsion cosmetic of the present invention may further contain an organic ultraviolet absorber. Examples of organic UV absorbers include those commonly used in cosmetics, such as 2-ethylhexyl methoxycinnamate, polysilicone-15, bisethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, ethylhexyl triazone, t-butylmethoxydibenzoylmethane, ethylhexyl triazone, oxybenzone-3, drometrizole trisiloxane, and ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate.

[0042] Among these, from the viewpoint of absorbing ultraviolet rays and protecting the skin, it is preferable to include one or more selected from 2-ethylhexyl methoxycinnamate, polysilicone-15, bisethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, and ethylhexyl triazone.

[0043] The organic UV absorber can be used alone or in combination of two or more, and from the viewpoint of stably maintaining the organic UV absorber in the emulsified particles, the content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 1% by mass or more, and is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less, based on the total composition. The content of the organic UV absorber is preferably 0.01 to 20% by mass, more preferably 0.1 to 15% by mass, and even more preferably 1 to 10% by mass, based on the total composition.

[0044] The oil-in-water emulsion cosmetic of the present invention may further contain a fatty acid ester that is solid at 25°C. "Solid at 25°C" means that the cosmetic exhibits properties of a semi-solid to solid state at 25°C. As the fatty acid ester that is solid at 25°C, a fatty acid monoester that is solid at 25°C is preferred. Examples of fatty acid monoesters include monoesters of fatty acids having 14 to 22 carbon atoms and alcohols having 14 to 32 carbon atoms, such as cetyl myristate, stearyl myristate, behenyl myristate, myristyl palmitate, cetyl palmitate, stearyl palmitate, arachyl palmitate, behenyl palmitate, myristyl stearate, cetyl stearate, stearyl stearate, arachyl stearate, behenyl stearate, myristyl behenate, cetyl behenate, stearyl behenate, arachyl behenate, and behenyl behenate, and monoesters of fatty acids having 16 to 22 carbon atoms and alcohols having 16 to 26 carbon atoms are preferred. Beeswax is also preferred.

[0045] The fatty acid ester that is solid at 25° C. preferably has a melting point of 42 to 80° C., more preferably 49 to 70° C. The melting point is measured by differential scanning calorimetry (DSC) (model: DSC7000X, manufactured by Hitachi High-Technologies Corporation). Of these, cetyl palmitate (melting point 54°C), myristyl myristate (42°C), stearyl stearate (62°C), and beeswax (melting point 61 to 66°C) are preferred, and cetyl palmitate and beeswax are more preferred.

[0046] The fatty acid esters solid at 25°C can be used singly or in combination of two or more. From the viewpoints of good finger feel, smooth spread upon application, and uniform adhesion to the skin, the content is preferably 0.1% by mass or more of the total composition, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.4% by mass or more, and preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 6% by mass or less, and even more preferably 2% by mass or less. The content of the fatty acid esters solid at 25°C is preferably 0.1 to 20% by mass of the total composition, more preferably 0.2 to 10% by mass, even more preferably 0.3 to 6% by mass, and even more preferably 0.4 to 2% by mass.

[0047] The oil-in-water emulsion cosmetic of the present invention may further contain a polyol. The polyol is a compound having two or more hydroxyl groups in the molecule, and any polyol that is commonly used in cosmetics may be used. Examples of dihydric alcohols include polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and pentanediol. Examples of trihydric alcohols include glycerin and trimethylolpropane. Examples of tetrahydric alcohols include diglycerin and erythritol. Examples of pentahydric or higher polyhydric alcohols include polyglycerins such as triglycerin; sugars and sugar alcohols such as glucose, maltose, maltose, sucrose, xylitol, sorbitol, malbitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0048] The polyol preferably contains one or more selected from dipropylene glycol, 1,3-butylene glycol, glycerin, maltitol, and sorbitol, from the viewpoint of smooth spreading when applied to the skin and improving the moisturizing feeling.

[0049] The polyol may be used alone or in combination of two or more, and from the viewpoint of forming an oil-in-water emulsion, the content is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, and is preferably 20% by mass or less, more preferably 16% by mass or less, and even more preferably 14% by mass or less, based on the total composition. The polyol content is preferably 0.1 to 20% by mass, more preferably 0.5 to 16% by mass, and even more preferably 1 to 14% by mass.

[0050] In the present invention, from the viewpoint of forming an oil-in-water emulsion, the water content of the total composition is preferably 30% by mass or more, more preferably 32% by mass or more, even more preferably 35% by mass or more, and preferably 70% by mass or less, more preferably 65% ​​by mass or less, and even more preferably 60% by mass or less. The water content of the total composition is preferably 30 to 70% by mass, more preferably 32 to 65% by mass, and even more preferably 35 to 60% by mass.

[0051] In the present invention, from the viewpoint of smooth spreading when applied to the skin and improving moisturizing feeling, the total content of water and polyol is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 45% by mass or more, and preferably 70% by mass or less, more preferably 65% ​​by mass or less, and even more preferably 60% by mass or less, based on the total composition. The total content of water and polyol is preferably 30 to 70% by mass, more preferably 40 to 65% by mass, and even more preferably 45 to 60% by mass.

[0052] In addition to the above-mentioned components, the oil-in-water emulsion cosmetic of the present invention may contain components that are commonly used in cosmetics, such as powders other than component (A), oily components other than those mentioned above, polymeric compounds, antioxidants, fragrances, preservatives, blood circulation promoters, moisturizers, cooling agents, antiperspirants, disinfectants, skin activators, cooling agents, colorants, etc. From the viewpoint of suppressing defects in appearance and properties, it is preferable that the oil-in-water emulsion cosmetic of the present invention contains substantially no aluminum ions.

[0053] The oil-in-water emulsion cosmetic of the present invention can be produced by a conventional method. Specifically, the oil-in-water emulsion cosmetic can be obtained by adding a powder phase obtained by mixing component (A) with a powder-containing oil phase obtained by mixing an oil phase component containing a portion of components (B) and (C) to an aqueous phase component containing the remainder of component (C), and emulsifying and dispersing the mixture. Alternatively, the oil-in-water emulsion cosmetic can be obtained by adding an oil phase component containing a portion of components (B) and (C) to the powder phase obtained by mixing component (A) and mixing them, and then adding an aqueous phase component containing the remainder of component (C) and mixing them.

[0054] The oil-in-water emulsion cosmetic of the present invention is preferably cream-like in terms of having a rich feel when taken with the fingers and achieving shape retention, and has a viscosity after storage at 25°C for 24 hours of 10,000 to 200,000 mPa·s, more preferably 30,000 to 120,000 mPa·s, even more preferably 60,000 to 100,000 mPa·s. In the present invention, the viscosity is measured using a B-type rotational viscometer with a helical stand (Model: Digital Viscometer TVB-10, Toki Sangyo Co., Ltd.) after rotating at 10 rpm for 1 minute using a rotor TC.

[0055] The oil-in-water emulsion cosmetic of the present invention can be used as, for example, makeup cosmetics such as makeup base, foundation, concealer, blusher, eye shadow, mascara, eyeliner, eyebrow cream, overcoat, and lipstick; UV protection cosmetics such as sunscreen emulsion and sunscreen cream; and skin care cosmetics such as skin care emulsion, skin care cream, BB cream, and beauty serum. In particular, it is suitable as a makeup cosmetic.

[0056] In relation to the above-described embodiment, the present invention further discloses the following compositions and the like.

[0057] <1> The following components (A), (B), and (C): (A) a substantially aluminum-free silica-treated titanium oxide or zinc oxide; (B) a nonionic surfactant containing at least (B1) a polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms; (C) Anionic surfactants An oil-in-water emulsion cosmetic comprising:

[0058] <2> In the titanium oxide of component (A), the amount of silica to be treated is preferably 1 to 20 mass % relative to the titanium oxide and zinc oxide, and more preferably 2 to 15 mass %. <1> The oil-in-water emulsion cosmetic composition described above. <3> It is preferable that component (A) is further subjected to a hydrophobic treatment, and the treatment is preferably an amino acid treatment, an acylated amino acid treatment, an alkoxytitanium alkylate treatment, an alkylalkoxysilane treatment, or a glycerin fatty acid ester treatment. It is more preferable that the treatment includes one or more treatments selected from an amino acid treatment and an acylated amino acid treatment, and it is even more preferable that the treatment includes an acylated amino acid treatment. <1> or <2> The oil-in-water emulsion cosmetic composition described above. <4> The content of component (A) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, and is preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 18% by mass or less, and even more preferably 11% by mass or less, based on the total composition. <1> ~ <3> The oil-in-water emulsion cosmetic according to any one of the above.

[0059] <5> The nonionic surfactant of component (B) preferably has an HLB value of 6.5 to 10, more preferably 7.3 to 9. <1> ~ <4> The oil-in-water emulsion cosmetic according to any one of the above. <6> The nonionic surfactant of component (B) preferably contains one or more surfactants selected from glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene sorbit fatty acid esters. <1> ~ <5> The oil-in-water emulsion cosmetic according to any one of the above. <7> The component (B1) is polyoxyethylene sorbitan beeswax. <1> ~ <6> The oil-in-water emulsion cosmetic according to any one of the above.

[0060] <8> The content of component (B1) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 5% by mass or less, and even more preferably 3% by mass or less, based on the total composition. <1> ~ <7> The oil-in-water emulsion cosmetic according to any one of the above. <9> The content of component (B) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, and is preferably 30% by mass or less, more preferably 20% by mass or less, even more preferably 12% by mass or less, and even more preferably 8% by mass, based on the total composition. <1> ~ <8> The oil-in-water emulsion cosmetic according to any one of the above.

[0061] <10> The mass ratio (A) / (B1) of the component (A) to the component (B1) is preferably 0.2 or more, more preferably 0.5 or more, and even more preferably 1 or more, and is preferably 10 or less, more preferably 8 or less, and even more preferably 6 or less. <1> ~ <9> The oil-in-water emulsion cosmetic according to any one of the above. <11> The mass ratio (B1) / (B) of the component (B1) to the component (B) is preferably 0.15 or more, more preferably 0.2 or more, and even more preferably 0.25 or more, and is preferably 0.7 or less, more preferably 0.5 or less, and even more preferably 0.4 or less. <1> ~ <10> The oil-in-water emulsion cosmetic according to any one of the above.

[0062] <12> The component (C) is preferably one or more selected from (C1) polyoxyalkylene alkyl ether carboxylic acid or a salt thereof, (C2) alkyl sulfuric acid or a salt thereof, or polyoxyalkylene alkyl ether sulfuric acid or a salt thereof, (C3) acylated amino acid or a salt thereof, (C4) fatty acid or a salt thereof, (C5) N-acylalkyltaurine or a salt thereof, more preferably one or two or more selected from (C3) acylated amino acid or a salt thereof, (C4) fatty acid or a salt thereof, (C5) N-acylalkyltaurine or a salt thereof, and even more preferably one or two or more selected from (C3) acylated amino acid or a salt thereof, and (C4) fatty acid or a salt thereof, <1> ~ <11> The oil-in-water emulsion cosmetic according to any one of the above. <13> The content of component (C) is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.4% by mass or more, even more preferably 1% by mass or more, and is preferably 10% by mass or less, more preferably 7% by mass or less, even more preferably 4% by mass or less, and even more preferably 2.5% by mass or less, based on the total composition. <1> ~ <12> The oil-in-water emulsion cosmetic according to any one of the above.

[0063] <14> It is preferable that the content of component (A) is 0.1 to 30% by mass, the content of component (B) is 0.1 to 30% by mass, the content of component (C) is 0.01 to 10% by mass, and the content of component (B1) is 0.1 to 20% by mass. <1> ~ <13> The oil-in-water emulsion cosmetic according to any one of the above. <15> The mass ratio (B1) / (C) of the component (B1) to the component (C) is preferably 0.2 or more, more preferably 0.5 or more, and even more preferably 0.8 or more, and is preferably 5 or less, more preferably 3 or less, and even more preferably 1.6 or less. <1> ~ <14> The oil-in-water emulsion cosmetic according to any one of the above. <16> The mass ratio (A) / [(B1)+(C)] of the component (A) to the total amount of the component (B1) and the component (C) is preferably 0.2 to 5, more preferably 0.4 to 4, even more preferably 0.5 to 3.5, and even more preferably 0.6 to 2.8. <1> ~ <15> The oil-in-water emulsion cosmetic according to any one of the above.

[0064] <17> Furthermore, it is preferable that the composition contains an oil agent that is liquid at 25°C, and more preferable that the composition contains one or more oil agents selected from hydrocarbon oils, ester oils, ether oils, silicone oils, and higher alcohols. <1> ~ <16> The oil-in-water emulsion cosmetic according to any one of the above. <18> The content of the oil agent that is liquid at 25°C is preferably 1% by mass or more, more preferably 3% by mass or more, and even more preferably 5% by mass or more, and is preferably 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less, based on the total composition. <17> The oil-in-water emulsion cosmetic composition described above.

[0065] <19> Furthermore, it is preferable that the composition further contains an organic ultraviolet absorber, and more preferable that the composition contains one or more selected from the group consisting of 2-ethylhexyl methoxycinnamate, polysilicone-15, bisethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, and ethylhexyl triazone. <1> ~ <18> The oil-in-water emulsion cosmetic according to any one of the above. <20> The content of the organic ultraviolet absorber is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 1% by mass or more, and is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less, based on the total composition. <19> The oil-in-water emulsion cosmetic composition described above.

[0066] <21> Furthermore, it is preferable that the composition contains a fatty acid ester that is solid at 25°C, more preferably a fatty acid monoester that is solid at 25°C, and it is even more preferable that the composition contains one or more selected from cetyl palmitate (melting point 54°C), myristyl myristate (42°C), stearyl stearate (62°C), and beeswax (melting point 61 to 66°C), and it is even more preferable that the composition contains one or more selected from cetyl palmitate and beeswax. <1> ~ <20> The oil-in-water emulsion cosmetic according to any one of the above. <22> The content of the solid fatty acid ester at 25°C is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.4% by mass or more, and is preferably 20% by mass or less, more preferably 10% by mass or less, even more preferably 6% by mass or less, and even more preferably 2% by mass or less, based on the total composition. <21> The oil-in-water emulsion cosmetic composition described above.

[0067] <23> Furthermore, it is preferable that the composition further contains a polyol, and more preferable that the composition contains one or more selected from the group consisting of dipropylene glycol, 1,3-butylene glycol, glycerin, maltitol, and sorbitol. <1> ~ <22> The oil-in-water emulsion cosmetic according to any one of the above. <24> The content of polyol is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, and is preferably 20% by mass or less, more preferably 16% by mass or less, and even more preferably 14% by mass or less, based on the total composition. <23> The oil-in-water emulsion cosmetic composition described above.

[0068] <25> The water content is preferably 30% by mass or more, more preferably 32% by mass or more, and even more preferably 35% by mass or more, and is preferably 70% by mass or less, more preferably 65% ​​by mass or less, and even more preferably 60% by mass or less, based on the total composition. <1> ~ <24> The oil-in-water emulsion cosmetic according to any one of the above. <26> The total content of water and polyol is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 45% by mass or more, and is preferably 70% by mass or less, more preferably 65% ​​by mass or less, and even more preferably 60% by mass or less, based on the total composition. <23> ~ <25> The oil-in-water emulsion cosmetic according to any one of the above.

[0069] <27> The viscosity after storage at 25°C for 24 hours is preferably 10,000 to 200,000 mPa·s, more preferably 30,000 to 120,000 mPa·s, and even more preferably 60,000 to 100,000 mPa·s. <1> ~ <26> The oil-in-water emulsion cosmetic according to any one of the above. <28> The above-mentioned makeup cosmetic <1> ~ <27> The oil-in-water emulsion cosmetic according to any one of the above. [Example]

[0070] Examples 1 to 7, Comparative Examples 1 to 4 Oil-in-water emulsion cosmetics (cream foundations) with the compositions shown in Tables 1 and 2 were prepared, and the viscosities were measured. Evaluations were also made of the finger spreadability, smoothness of spread when applied to the skin, adhesion to the skin, and ability to cover uneven skin tone after application. The results are also shown in Tables 1 and 2.

[0071] (Manufacturing method) An oil-in-water emulsion cosmetic was obtained by adding and mixing an oil phase component containing a portion of component (B) and component (C) to the powder phase obtained by mixing component (A), followed by adding an aqueous phase component containing the remainder of component (C). The mixture was mixed using a disper and then further stirred using a homomixer.

[0072] (Evaluation method) (1) Viscosity: The viscosity of each emulsion cosmetic at 25°C after 24 hours of storage was measured using a B-type rotational viscometer with a helical stand (model: digital viscometer TVB-10, manufactured by Toki Sangyo Co., Ltd.) after rotating it at 10 rpm using a rotor TC for 1 minute.

[0073] (2) Finger: Each emulsion cosmetic was placed in a glass bottle and stored at 50°C for one week. After returning to 25°C, the feel of the skin on the fingers was evaluated according to the following criteria. 3;Soft and easy to remove with your fingertips. 2: It is a little hard but easy to remove with your fingertips. 1: Hard and cannot be removed with fingertips.

[0074] (3) Smoothness of application to the skin: Five expert evaluators evaluated the smoothness of each emulsion cosmetic when applied to the skin, using the following criteria. The results are shown as the total score given by the five evaluators. 4. Grows very smoothly. 3;Smooth stretch. 2: It doesn't spread very smoothly. 1: Does not spread smoothly.

[0075] (4) Adhesion when applied to the skin: Five expert evaluators evaluated each emulsion cosmetic product on the skin for uniform adhesion according to the following criteria. The results are shown as the total score of the five evaluators. 4. After application, the cosmetics adhere evenly to the skin (skin grooves and skin mounds). 3: After application, the cosmetic adheres to the skin (skin grooves and ridges) fairly evenly. 2: After application, the cosmetic adheres to the skin (skin grooves and ridges) in a slightly uneven manner. 1: After application, the cosmetic adheres unevenly to the skin (skin grooves and ridges).

[0076] (5) Uneven skin tone coverage after application: Five expert evaluators evaluated the ability of each emulsion cosmetic to cover uneven skin tone after application to the skin according to the following criteria. The results are shown as the total score of the five evaluators. 4. Provides excellent coverage after application. 3. Provides excellent coverage after application. 2: After application, the coverage is not very good. 1. Coverage is not strong after application.

[0077] [Table 1]

[0078] [Table 2]

[0079] Prescription examples 1-3 The oil-in-water emulsion cosmetics (cream foundations) having the compositions shown in Tables 3 and 5, and the oil-in-water emulsion cosmetics (UV primers) having the compositions shown in Table 4 were produced in the same manner as in Examples 1 to 7, and were easy to spread on the fingers, spread smoothly when applied to the skin, adhered evenly to the skin, and had excellent ability to cover uneven skin tone.

[0080] [Table 3]

[0081] [Table 4]

[0082] [Table 5]

Claims

1. The following components (A), (B), and (C): (A) a substantially aluminum-free silica-treated titanium oxide or zinc oxide; (B) a nonionic surfactant containing at least (B1) a polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms; (C) Anionic surfactant An oil-in-water emulsion cosmetic comprising:

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the mass ratio (A) / (B1) of component (A) to component (B1) is 0.2 to 10.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (B1) is polyoxyethylene sorbitan beeswax.

4. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein component (C) is one or more members selected from the group consisting of (C3) an acylated amino acid or a salt thereof, and (C4) a fatty acid or a salt thereof.

5. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the content of component (A) is 0.1 to 30% by mass, the content of component (B) is 0.1 to 30% by mass, the content of component (C) is 0.01 to 10% by mass, and the content of component (B1) is 0.1 to 20% by mass.

6. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the mass ratio of component (A) to the total amount of component (B1) and component (C), (A) / [(B1)+(C)], is 0.2 to 5.

7. 3. The oil-in-water emulsion cosmetic according to claim 1, which has a viscosity at 25°C of 10,000 to 200,000 mPa·s.

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