Oil-in-water emulsion cosmetic

Abstract

To provide an oil-in-water emulsion cosmetic that has uniform emulsion particles, allows colored pigments to remain non-aggregated, exhibits superior stability, and achieves superior high-temperature stability over time.SOLUTION: An oil-in-water emulsion cosmetic contains the following components (A), (B), (C), and (D): (A) a colored pigment treated with one or two or more selected from the group consisting of an amino acid, an acylated amino acid, an alkoxytitanium alkylate, an alkyl alkoxysilane, and a glycerin fatty acid ester that does not contain a hydroxyl group and is liquid at 25°C, (B) a nonionic surfactant containing at least (B1) a polyoxyethylene sorbit fatty acid ester having a fatty acid with 16 to 22 carbon atoms, (C) a fatty acid ester that is solid at 25°C, and (D) 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 the problem of poor emulsion stability and prone to aggregation of color pigments. They also lack sufficient stability at high temperatures over time. [Means for solving the problem]

[0005] The present inventors have discovered that by subjecting a color pigment to a specific hydrophobic treatment and using a specific nonionic surfactant, a solid fatty acid ester, and an anionic surfactant in combination, it is possible to obtain an oil-in-water emulsion cosmetic in which the emulsified particles are uniform, the color pigment does not aggregate, and the stability is excellent, and in particular the high-temperature stability over time is excellent.

[0006] The present invention relates to a composition comprising the following components (A), (B), (C) and (D): (A) a color pigment treated with one or more selected from amino acids, acylated amino acids, alkoxytitanium alkylates, alkylalkoxysilanes, and hydroxyl-free glycerin fatty acid esters that are liquid at 25°C; (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) a fatty acid ester that is solid at 25°C; (D) 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 uniform emulsion particles, excellent stability, and no aggregation of color pigments is observed. It also has excellent stability over time at high temperatures. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 shows optical microscope photographs of the oil-in-water emulsion cosmetics of Example 1 and Comparative Example 4 in Test Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0009] Component (A) used in the present invention is a colored pigment treated with one or more selected from the group consisting of amino acids, acylated amino acids, alkoxytitanium alkylates, alkylalkoxysilanes, and hydroxyl-free glycerin fatty acid esters that are liquid at 25°C. Examples of color pigments include those commonly used in cosmetics, such as metal oxides such as titanium oxide, zinc oxide, yellow iron oxide, red iron oxide, black iron oxide, Prussian blue, ultramarine blue, chromium oxide, and chromium hydroxide; metal complexes such as manganese violet and cobalt titanate; inorganic pigments such as carbon black; synthetic organic pigments such as Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue 404; and natural organic pigments such as β-carotene, caramel, and paprika pigment. Among these, it is preferable to include one or more selected from titanium oxide, zinc oxide, yellow iron oxide, red iron oxide, and black iron oxide, and it is more preferable to include one or more selected from titanium oxide, yellow iron oxide, red iron oxide, and black iron oxide.

[0010] Examples of amino acids used to treat color pigments include proline, hydroxyproline, alanine, glycine, sarcosine, lysine, aspartic acid, and glutamic acid, as well as salts thereof. 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 excellent stability and suppression of aggregation of color pigments, 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.

[0011] Examples of alkoxytitanium alkylates used to treat color pigments include isopropyl triisostearoyl titanate, isopropyl triisomyristyl titanate, methyl triisostearoyl titanate, methyl triisomyristyl titanate, ethyl triisostearoyl titanate, and ethyl triisomyristyl titanate, with isopropyl triisostearoyl titanate being more preferred.

[0012] The alkylalkoxysilane used to treat the color pigment is preferably an alkylalkoxysilane having a linear or branched alkyl group having 6 to 20 carbon atoms, such as octyltriethoxysilane (triethoxycaprylylsilane) or octyltrimethoxysilane (trimethoxycaprylylsilane), with octyltriethoxysilane (triethoxycaprylylsilane) being more preferred.

[0013] The hydroxyl-free glycerin fatty acid ester, which is liquid at 25°C and used to treat color pigments, is preferably an ester compound of glycerin with a linear or branched fatty acid having 8 to 20 carbon atoms and which does not contain a hydroxyl group in the molecule. Of the above fatty acids, fatty acids having 8 to 18 carbon atoms are preferred. Glycerin includes unpolymerized monoglycerin and polymerized polyglycerin. When polyglycerin is used, its degree of polymerization is not particularly limited, but is preferably 2 or more and 10 or less. Among these, monoglycerin and diglycerin, which has a degree of polymerization of 2, are preferred. Examples of glycerin fatty acid esters that do not contain hydroxyl groups and are liquid at 25°C include tri(caprylic / capric)glyceryl, glyceryl triisostearate, and diglyceryl tetraisostearate, with diglyceryl tetraisostearate being more preferred.

[0014] The treatment with amino acids, acylated amino acids, alkoxytitanium alkylates, alkylalkoxysilanes, and hydroxyl-free glycerin fatty acid esters that are liquid at 25°C can be carried out according to a conventional method, for example, dry treatment, wet treatment, etc., and refers to coating the surface of a color pigment. The color pigment may be hydrophobized with a compound other than these.

[0015] Component (A) contains a color pigment that has been treated with one or more of amino acid treatments and acylated amino acid treatments, from the viewpoint of excellent stability and suppression of aggregation of the color pigment. Preferably, the color pigment is an acylated amino acid treated color pigment.

[0016] Component (A) can be used alone or in combination of two or more, and from the viewpoint of excellent stability and suppression of aggregation of the color pigment, the content is preferably 0.1 mass% or more of the total composition, more preferably 0.5 mass% or more, even more preferably 1 mass% or more, still more preferably 2 mass% or more, preferably 30 mass% or less, more preferably 25 mass% or less, even more preferably 18 mass% or less, and even more preferably 12 mass% or less. The content of component (A) is preferably 0.1 to 30 mass% of the total composition, more preferably 0.5 to 25 mass%, even more preferably 1 to 18 mass%, and even more preferably 2 to 12 mass%.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Component (B) contains at least (B1) a polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms, from the viewpoint that the emulsified oil droplets are held in a continuous layer of the oil-in-water emulsion, thereby making the emulsified particles uniform and highly stable and suppressing aggregation of the color pigment. 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.

[0021] 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, 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, from the viewpoint that the polyoxyethylene sorbite fatty acid ester having a fatty acid of 16 to 22 carbon atoms embraces the emulsified oil droplets and exists in a continuous layer of the oil-in-water emulsion, thereby resulting in uniform emulsified particles, excellent stability, suppression of color pigment aggregation, and excellent high-temperature stability over time. The content of component (B1) is preferably 0.1 to 20% by mass of the total composition, 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.

[0022] Component (B) includes component (B1), and can be used alone or in combination of two or more. From the viewpoint of forming an oil-in-water emulsion, the content 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 20% by mass or less, even more preferably 12% by mass or less, and even more preferably 8% by mass or less. The content of component (B) is preferably 0.1 to 30% by mass of the total composition, more preferably 0.5 to 20% by mass, even more preferably 1 to 12% by mass, and even more preferably 2 to 8% by mass.

[0023] 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, and preferably 10 or less, more preferably 8 or less, and even more preferably 6 or less, from the viewpoints of achieving uniformity of emulsified particles contained in emulsified oil droplets of a specific hydrophobized color pigment, suppression of aggregation of the color pigment, and excellent high-temperature stability over time. 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.

[0024] 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, and 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 viewpoint that the polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms embraces emulsified oil droplets and is present in a continuous layer of the oil-in-water emulsion, thereby resulting in uniform emulsified particles, excellent stability, suppression of aggregation of color pigments, and excellent high-temperature stability over time. The mass ratio (B1) / (B) of component (B1) to component (B) is preferably from 0.15 to 0.7, more preferably from 0.2 to 0.5, and even more preferably from 0.25 to 0.4.

[0025] Component (C) is a fatty acid ester that is solid at 25° C. Being solid at 25° C. means that it exhibits semi-solid to solid properties at 25° C. The fatty acid ester of component (C) is preferably a fatty acid monoester that is solid at 25°C. 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.

[0026] The fatty acid ester of component (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). As component (C), cetyl palmitate (melting point 54°C), myristyl myristate (42°C), stearyl stearate (62°C), and beeswax (melting point 61 to 66°C) are preferred, with cetyl palmitate and beeswax being more preferred.

[0027] Component (C) can be used alone or in combination of two or more. The fatty acid ester, solid at 25°C, embraces emulsified oil droplets and exists in a continuous layer of the oil-in-water emulsion, resulting in uniform emulsified particles with excellent stability and suppressed aggregation of the color pigment. From this viewpoint, the content of component (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, 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 component (C) is preferably 0.1 to 20% by mass, 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.

[0028] Examples of the anionic surfactant of component (D) include those used in ordinary cosmetics, such as (D1) polyoxyalkylene alkyl ether carboxylic acid or a salt thereof, (D2) alkyl sulfuric acid or a salt thereof, or polyoxyalkylene alkyl ether sulfuric acid or a salt thereof, (D3) acylated amino acid or a salt thereof, (D4) fatty acid or a salt thereof, (D5) 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. Among these, from the viewpoint of achieving excellent emulsion stability of the oil-in-water emulsion and suppressing aggregation of the color pigment, it is preferable to contain one or more types selected from (D3) acylated amino acids or salts thereof, (D4) fatty acids or salts thereof, and (D5) N-acylalkyltaurines or salts thereof, and it is more preferable to contain one or more types selected from (D3) acylated amino acids or salts thereof, and (D4) fatty acids or salts thereof.

[0029] (D3) The acylated amino acid or a salt thereof includes, for example, an acylated amino acid represented by the general formula (1)

[0030] [ka]

[0031] (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:

[0032] 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.

[0033] 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. Among these, N-acylglycine salts and N-acylglutamates are preferred from the viewpoint of excellent emulsion stability of the oil-in-water emulsion and suppression of aggregation of the color pigment.

[0034] (D4) Examples of fatty acids or salts thereof include fatty acids having 10 to 22 carbon atoms and salts thereof. The fatty acid having 10 to 22 carbon atoms or its salt preferably includes a fatty acid having a linear or branched alkyl group having 10 to 18 carbon atoms, from the viewpoint of providing excellent emulsion stability for the oil-in-water emulsion and suppressing aggregation of the color pigment. Specific examples include laurate, myristate, palmitate, stearate, and behenate. These salts preferably contain one or more salts selected from alkali metals and ammonium, more preferably one or more salts selected from alkali metals, and even more preferably sodium salts and potassium salts.

[0035] (D5) As the N-acylalkyltaurine or a salt thereof, an N-acylmethyltaurine salt having 8 to 18 carbon atoms is more preferred. The component (D) does not include the anionic surfactant used for the surface treatment in the component (A).

[0036] Component (D) can be used alone or in combination of two or more types, and from the viewpoint of excellent emulsion stability of the oil-in-water emulsion and suppression of aggregation of the color pigment, the content is preferably 0.01 mass% or more of the total composition, more preferably 0.1 mass% or more, even more preferably 0.4 mass% or more, even more preferably 1 mass% or more, preferably 10 mass% or less, more preferably 7 mass% or less, even more preferably 4 mass% or less, and even more preferably 2.5 mass% or less. The content of component (D) is preferably 0.01 to 10 mass% of the total composition, more preferably 0.1 to 7 mass%, even more preferably 0.4 to 4 mass%, even more preferably 1 to 2.5 mass%.

[0037] In the present invention, the mass ratio (B1) / [(C)+(D)] of component (B1) to the total amount of components (C) and (D) is preferably 0.3 or more, more preferably 0.4 or more, even more preferably 0.5 or more, and preferably 3 or less, more preferably 2 or less, and even more preferably 1.2 or less, from the viewpoint that the polyoxyethylene sorbite fatty acid ester having a fatty acid having 16 to 22 carbon atoms embraces emulsified oil droplets and exists in a continuous layer of the oil-in-water emulsion, thereby resulting in uniform emulsified particles, excellent stability, suppressed aggregation of the color pigment, and excellent high-temperature stability over time. Furthermore, the mass ratio (B1) / [(C)+(D)] of component (B1) to the total amount of components (C) and (D) is preferably 0.3 to 3, more preferably 0.4 to 2, and even more preferably 0.5 to 1.2.

[0038] In the present invention, the mass ratio (A) / [(B1)+(C)+(D)] of component (A) to the total amount of components (B1), (C), and (D) is preferably 1 or more, more preferably 1.5 or more, even more preferably 1.7 or more, and is preferably 5 or less, more preferably 3 or less, and even more preferably 2.4 or less, from the viewpoints of uniformity of emulsion particles, excellent stability, suppression of aggregation of color pigments, and excellent high-temperature stability over time. Furthermore, the mass ratio (A) / [(B1)+(C)+(D)] of component (A) to the total amount of components (B1), (C), and (D) is preferably 1 to 5, more preferably 1.5 to 3, and even more preferably 1.7 to 2.4.

[0039] 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.

[0040] 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).

[0041] 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 monoisostearate monomyristate, 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.

[0042] 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.

[0043] The ether oils include dialkyl ethers, and specific examples thereof include dihexyl ether, dicaprylyl ether, and cetyl-1,3-dimethylbutyl ether.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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, maltitol, sucrose, xylitol, sorbitol, malbitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0051] The polyol preferably contains one or more selected from dipropylene glycol, 1,3-butylene glycol, glycerin, maltitol, and sorbitol, from the viewpoint of improving emulsion stability and moisturizing feeling.

[0052] 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.

[0053] 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.

[0054] In the present invention, from the viewpoint of excellent stability of the oil-in-water emulsion, 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.

[0055] 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.

[0056] 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 an aqueous phase component containing a portion of component (D) and a powder-containing oil phase obtained by mixing an oil phase component containing the remainder of components (B), (C), and (D), and emulsifying and dispersing the mixture. Alternatively, the oil-in-water emulsion cosmetic can be obtained by adding and mixing an oil phase component containing a portion of components (B), (C), and (D) to the powder phase obtained by mixing component (A), and then adding and mixing an aqueous phase component containing the remainder of component (D).

[0057] 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, manufactured by Toki Sangyo Co., Ltd.) after rotating at 10 rpm for 1 minute using a rotor TC.

[0058] 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.

[0059] In relation to the above-described embodiment, the present invention further discloses the following compositions and the like.

[0060] <1> The following components (A), (B), (C), and (D): (A) a color pigment treated with one or more selected from amino acids, acylated amino acids, alkoxytitanium alkylates, alkylalkoxysilanes, and hydroxyl-free glycerin fatty acid esters that are liquid at 25°C; (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) a fatty acid ester that is solid at 25°C; (D) Anionic surfactants An oil-in-water emulsion cosmetic comprising:

[0061] <2> The color pigment of component (A) is preferably a metal oxide, and more preferably contains one or more selected from titanium oxide, zinc oxide, yellow iron oxide, red iron oxide, and black iron oxide, and further preferably contains one or more selected from titanium oxide, yellow iron oxide, red iron oxide, and black iron oxide. <1> The oil-in-water emulsion cosmetic composition described above. <3> Component (A) is preferably a color pigment treated with one or more selected from the group consisting of an amino acid treatment and an acylated amino acid treatment, and more preferably contains an acylated amino acid treated color pigment, and even more preferably contains one or more selected from the group consisting of a color pigment treated with disodium stearoyl glutamate and a color pigment treated with sodium lauroyl aspartate. <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 12% by mass or less, based on the total composition. <1> ~ <3> The oil-in-water emulsion cosmetic according to any one of the above.

[0062] <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 component (B) preferably contains one or more selected from glycerin fatty acid esters, polyoxyethylene soltan 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 preferably polyoxyethylene sorbitan beeswax. <1> ~ <6> The oil-in-water emulsion cosmetic according to any one of the above.

[0063] <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 or less, based on the total composition. <1> ~ <8> The oil-in-water emulsion cosmetic according to any one of the above.

[0064] <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.

[0065] <12> The fatty acid ester of component (C) is preferably a fatty acid monoester that is solid at 25°C, more preferably cetyl palmitate (melting point 54°C), myristyl myristate (42°C), stearyl stearate (62°C), or beeswax (melting point 61 to 66°C), and even more preferably cetyl palmitate or beeswax. <1> ~ <11> The oil-in-water emulsion cosmetic according to any one of the above. <13> The content of component (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. <1> ~ <12> The oil-in-water emulsion cosmetic according to any one of the above.

[0066] <14> The anionic surfactant of component (D) is preferably one or more selected from (D1) polyoxyalkylene alkyl ether carboxylic acid or a salt thereof, (D2) alkyl sulfuric acid or a salt thereof, or polyoxyalkylene alkyl ether sulfuric acid or a salt thereof, (D3) acylated amino acid or a salt thereof, (D4) fatty acid or a salt thereof, (D5) N-acylalkyltaurine or a salt thereof, and more preferably one or more selected from (D3) acylated amino acid or a salt thereof, (D4) fatty acid or a salt thereof, and (D5) N-acylalkyltaurine or a salt thereof. <1> ~ <13> The oil-in-water emulsion cosmetic according to any one of the above. <15> The content of component (D) 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> ~ <14> The oil-in-water emulsion cosmetic according to any one of the above.

[0067] <16> 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 0.1 to 20% by mass, and the content of component (D) is 0.01 to 10% by mass. <1> ~ <15> The oil-in-water emulsion cosmetic according to any one of the above. <17> the mass ratio (B1) / [(C)+(D)] of the component (B1) to the total amount of the components (C) and (D) is preferably 0.3 or more, more preferably 0.4 or more, even more preferably 0.5 or more, and is preferably 3 or less, more preferably 2 or less, even more preferably 1.2 or less; <1> ~ <16> The oil-in-water emulsion cosmetic according to any one of the above. <18> the mass ratio (A) / [(B1)+(C)+(D)] of component (A) to the total amount of component (B1), component (C), and component (D) is preferably 1 or more, more preferably 1.5 or more, even more preferably 1.7 or more, and is preferably 5 or less, more preferably 3 or less, and even more preferably 2.4 or less; <1> ~ <17> The oil-in-water emulsion cosmetic according to any one of the above.

[0068] <19> 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> ~ <18> The oil-in-water emulsion cosmetic according to any one of the above. <20> 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. <19> The oil-in-water emulsion cosmetic composition described above.

[0069] <21> 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> ~ <20> The oil-in-water emulsion cosmetic according to any one of the above. <22> 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. <21> The oil-in-water emulsion cosmetic composition described above.

[0070] <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.

[0071] <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.

[0072] <27> Preferably, the viscosity after 24 hours of storage at 25°C is 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 cosmetic is a makeup cosmetic. <1> ~ <27> The oil-in-water emulsion cosmetic according to any one of the above. [Example]

[0073] Examples 1 to 10, Comparative Examples 1 to 4 Oil-in-water emulsion cosmetics (cream foundations) were prepared with the compositions shown in Tables 1 and 2, and the viscosities were measured. The stability, emulsification state, and pigment aggregation immediately after preparation, as well as the emulsification state and pigment aggregation after storage at 45°C for one month, were evaluated. The results are also shown in Tables 1 and 2.

[0074] (Manufacturing method) An oil-phase component containing a portion of components (B), (C), and (D) was added to and mixed with the powder phase obtained by mixing component (A), and then the aqueous phase component containing the remainder of component (D) was added and mixed using a disper, followed by further stirring using a homomixer, thereby obtaining an oil-in-water emulsion cosmetic.

[0075] (Evaluation method) (1) Viscosity: Immediately after production, the viscosity of each cosmetic product after 24 hours of storage at 25°C 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.

[0076] (2) Stability immediately after manufacturing: Immediately after production, the appearance of each cosmetic material at 25°C was visually observed. 2: No separation is observed. 1: Separation is observed.

[0077] (3) Emulsified state immediately after production: Immediately after production, the emulsified state of each cosmetic preparation at 25°C was observed under a microscope. 3: Confirm uniform emulsion particles. 2: Uneven emulsion particles were observed. 1: The aqueous phase seeped out and an uneven emulsion was observed.

[0078] (4) Pigment cohesion immediately after production: Immediately after production, each cosmetic composition was observed under a microscope for pigment aggregation at 25°C. 3: No pigment agglomeration is observed (10 μm or less). 2: Small pigment agglomerates are observed (greater than 10 μm and less than 50 μm). 1: Large pigment agglomerates are observed (greater than 50 μm).

[0079] (5) Emulsification state after 1 month storage at 45℃: After storage at 45°C for one month, the emulsified state of each cosmetic preparation was observed under a microscope. 3: Confirm uniform emulsion particles. 2: Uneven emulsion particles were observed. 1: The aqueous phase seeped out and an uneven emulsion was observed.

[0080] (6) Pigment aggregation after storage at 45°C for 1 month: After storage at 45°C for one month, the pigment aggregation of each cosmetic was observed under a microscope. 3: No pigment agglomeration is observed (10 μm or less). 2: Small pigment agglomerates are observed (greater than 10 μm and less than 50 μm). 1: Large pigment agglomerates are observed (greater than 50 μm).

[0081] [Table 1]

[0082] [Table 2]

[0083] Test Example 1 Immediately after production, emulsion particles at 25°C were observed for the oil-in-water emulsion cosmetics of Example 1 and Comparative Example 4 using an optical microscope (model: Digital Microscope VHX-9, manufactured by Keyence Corporation). The results are shown in Figure 1. The oil-in-water emulsion cosmetic of Example 1 had uniform emulsion particles and no pigment aggregation was observed. In contrast, the oil-in-water emulsion cosmetic of Comparative Example 4 had non-uniform emulsion particles and large pigment aggregates were observed.

[0084] Prescription examples 1-4 The oil-in-water emulsion cosmetics (cream foundations) having the compositions shown in Tables 3 to 6 were produced in the same manner as in Examples 1 to 5, and had uniform emulsion particles, no aggregation of color pigments, excellent stability, and excellent high-temperature stability over time.

[0085] [Table 3]

[0086] [Table 4]

[0087] [Table 5]

[0088] [Table 6]

Claims

1. The following components (A), (B), (C), and (D): (A) a color pigment treated with one or more selected from the group consisting of amino acids, acylated amino acids, alkoxytitanium alkylates, alkylalkoxysilanes, and hydroxyl-free glycerin fatty acid esters that are liquid at 25°C; (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) a fatty acid ester that is solid at 25°C; (D) 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 a fatty acid monoester that is solid at 25°C.

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 0.1 to 20% by mass, and the content of component (D) is 0.01 to 10% 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), component (C), and component (D), (A) / [(B1)+(C)+(D)], is 1 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.

Images