Oil-in-water emulsion cosmetic or manufacturing method thereof

Abstract

To provide an oil-in-water emulsion cosmetic that combines water resistance of a coating film with dispersion stability at high temperatures and has excellent color retention upon application.SOLUTION: Provided is an oil-in-water emulsion cosmetic containing the following components (A) to (D): (A) a metal oxide having an average particle size of 0.01 to 1.0 μm and coated with a surface treatment agent of ester having an alkyl group having 12 to 20 carbon atoms, a degree of ester substitution of the surface treatment agent being 60 to 100%; (B) one or more selected from polyoxyalkylene alkyl ether phosphates and salts thereof having an alkyl group having 12 to 20 carbon atoms, and phospholipids; (C) a nonionic surfactant not containing a phosphate skeleton or a silicone skeleton; and (D) an anionic water-soluble thickener.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic and a method for producing the same. [Background technology]

[0002] Oil-in-water emulsion cosmetics are a formulation used in makeup cosmetics such as foundations, primers, and BB creams, as well as skin care cosmetics such as emulsions, creams, and daytime serums. It has a refreshing feel while also exhibiting a moderate emollient effect, making it suitable for use in a variety of products. In particular, in makeup cosmetics, it is an important formulation for achieving a refreshing feel upon application, light spreadability, and a moist, non-drying feel over time.

[0003] However, oil-in-water emulsion cosmetics tend to be easily absorbed by sweat, etc., and have had problems with cosmetic durability, such as cosmetic film retention and smudging resistance. Furthermore, in particular with oil-in-water powder-containing cosmetics, the dispersibility of the powder affects the feel when used, and color change tends to occur when water evaporates and the phase changes during use, and powder aggregation has sometimes been observed over time.

[0004] Known examples of oil-in-water emulsion cosmetics containing powder include an oil-in-water emulsion cosmetic that contains a first polyether-modified silicone with an HLB value of more than 10.0 and 18.0 or less, a lower alcohol, and pigment-grade hydrophobized particles in the dispersion medium, and oil droplets that contain an oil component and a second polyether-modified silicone with an HLB value of 10.0 or less, and that is capable of exhibiting good water resistance and a tone-up effect (see Patent Document 1); and an oil-in-water emulsion cosmetic that consists of an inorganic powder that has been hydrophobized with trialkoxyalkylsilane, polyhydroxystearic acid, a specific polyglycerol fatty acid ester, an oil phase that contains liquid oil, and an aqueous phase that contains a specific water-soluble polymer, and that has excellent sunscreen effect, usability, and storage stability (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-166758 [Patent Document 2] Japanese Patent Publication No. 2022-164505 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of Patent Document 1, for example, pigment-grade hydrophobized particles tended to aggregate under high-temperature conditions, causing color unevenness and impairing stability over time at high temperatures. Furthermore, in the case of Patent Document 2, when a pigment was blended, the emulsion cosmetic composition suffered from a significant color change upon application, and water resistance tended to be insufficient. Therefore, there was a need for the development of an oil-in-water emulsion cosmetic composition that exhibits good water resistance, does not cause color change upon application, and has excellent dispersion stability at high temperatures. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above-mentioned problems, and as a result have found that by combining a metal oxide coated with a specific surface treatment agent, one or more selected from polyoxyalkylene alkyl ether phosphates and salts thereof having an alkyl group with 12 to 20 carbon atoms, and phospholipids, with a nonionic surfactant and an anionic water-soluble thickener, it is possible to realize an oil-in-water emulsion cosmetic that has good water resistance, little color change upon application of the emulsion composition, and excellent dispersion stability at high temperatures, and have completed the present invention.

[0008] That is, the means for solving the above problems of the present invention include the following aspects. [1] The following components (A) to (D): (A) A metal oxide having an average particle size of 0.01 to 1.0 μm and coated with a surface treatment agent of an ester having an alkyl group having 12 to 20 carbon atoms, wherein the degree of ester substitution of the surface treatment agent is 60 to 100%. (B) One or more selected from polyoxyalkylene alkyl ether phosphates having an alkyl group having 12 to 20 carbon atoms and salts thereof, and phospholipids (C) Nonionic surfactants that do not contain a phosphate skeleton or a silicone skeleton (D) Anionic water-soluble thickener The oil-in-water emulsion cosmetic comprises: [2] The oil-in-water emulsion cosmetic according to [1], wherein the component (B) is a polyoxyalkylene alkyl ether phosphate having an alkyl group having 12 to 20 carbon atoms or a salt thereof. [3] The oil-in-water emulsion cosmetic according to [1] or [2], wherein the component (C) is one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, and polyglycerin fatty acid ester. [4] The oil-in-water emulsion cosmetic according to any one of [1] to [3], wherein the surface treatment agent of the component (A) is one or more selected from polyglycerol fatty acid esters. [5] The oil-in-water emulsion cosmetic according to any one of [1] to [4], wherein the component (D) has a (meth)acrylic acid skeleton. [6] The oil-in-water emulsion cosmetic according to any one of [1] to [5], further comprising a volatile oil as component (E). [7] The oil-in-water emulsion cosmetic according to any one of [1] to [6], further comprising a hydrophobic film-forming agent as component (F). [8] The oil-in-water emulsion cosmetic according to any one of [1] to [7], wherein the mass ratio (A) / (B) of the content of the component (A) to the content of the component (B) is 5 to 800. [9] The oil-in-water emulsion cosmetic according to any one of [1] to [8], wherein the component (A) is contained in the aqueous phase.

[10] The following components (A) to (D): (A) A metal oxide having an average particle size of 0.01 to 1.0 μm and coated with a surface treatment agent of a polyhydric alcohol ester having an alkyl group having 12 to 20 carbon atoms, wherein the degree of ester substitution of the surface treatment agent is 60 to 100%. (B) One or more selected from polyoxyalkylene alkyl ether phosphates having an alkyl group of 12 to 20 carbon atoms and salts thereof, and phospholipids (C) Nonionic surfactants that do not contain a phosphate skeleton or a silicone skeleton (D) Anionic water-soluble thickener An oil-in-water emulsion cosmetic comprising: The component (A) is contained in an aqueous phase, The method for producing an oil-in-water emulsion cosmetic contains, in the oil phase, powder in component (A) having an average particle size of 0.01 to 0.1 μm and / or powder other than component (A) having an average particle size of 0.01 to 0.1 μm.

[0009] The following inventions can be added:

[11] The oil-in-water emulsion cosmetic according to any one of [1] to [9], wherein the content of the component (B) is 0.05 to 1.0% by mass. [Effects of the Invention]

[0010] The present invention provides an oil-in-water emulsion cosmetic that achieves both water resistance of the coating film and dispersion stability at high temperatures, and exhibits excellent color retention upon application. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following preferred embodiments and can be freely modified within the scope of the present invention. In this specification, percentages are expressed by mass unless otherwise specified. In this specification, when a numerical range is expressed using "to", the range includes both ends. The upper limit (or less) and the lower limit (or more) of each numerical range (to) can be arbitrarily combined as desired. The "average particle size" in this specification refers to the number-average particle size (D50) obtained by observing the surface condition using a scanning electron microscope (JEOL, JSM-7800prime) and measuring with an image analyzer (Luzex AP, Nireco Corporation). In the case of asymmetric shapes, the median diameter D50 obtained from the distribution of the largest particle major diameter is used as the average particle size in this specification.

[0012] The concept of the oil-in-water emulsion cosmetic of the present invention will be described first. When a powder such as a metal oxide is incorporated into an oil-in-water emulsion cosmetic, it is important that the dispersibility of the powder is minimally affected during phase inversion during application, i.e., when the dispersion medium changes as the external aqueous phase evaporates and the oil phase becomes the continuous phase, and that the powder is less likely to aggregate or change on the skin, resulting in excellent color stability upon application. Component (A) must be well dispersed not only in the internal oil phase but also in the external aqueous phase. Since oil-in-water emulsion cosmetics come into contact with the skin from the aqueous phase immediately after application, it is preferable for the powder to be finely dispersed in the external aqueous phase, from the perspective of facilitating powder dispersion from the initial stage of application. Specifically, when a powder is dispersed in the oil phase, it is necessary that emulsion droplets containing the powder are finely dispersed in the aqueous phase or that the emulsion interface is prone to phase inversion collapse, allowing the powder-containing components to immediately disperse into the aqueous phase. When a powder is dispersed in the external aqueous phase, it is necessary that the powder is stably dispersed in the aqueous phase beforehand.

[0013] Component (A) used in the present invention is a metal oxide having an average particle size of 0.01 to 1.0 μm and coated with a surface treatment agent of an ester having an alkyl group having 12 to 20 carbon atoms, and the degree of ester substitution of the surface treatment agent is 60 to 100%. The ester having an alkyl group having 12 to 20 carbon atoms is an ester of a saturated or unsaturated higher fatty acid having 12 to 20 carbon atoms and a polyhydric alcohol, or an ester of a saturated or unsaturated higher alcohol having 12 to 20 carbon atoms and an organic acid, and has a degree of ester substitution of hydroxyl groups of 60 to 100%. In the present invention, the degree of ester substitution can be calculated from the alcohol acid value, unless otherwise specified. Those used as oily components are preferred, and more preferably the degree of ester substitution of hydroxyl groups is 75 to 100%. For example, examples of esters of saturated or unsaturated higher fatty acids having 12 to 20 carbon atoms and monohydric or polyhydric alcohols include polyglycerol fatty acid esters, which are esters of glycerol and higher fatty acids with a degree of polymerization of 1 to 12; dextrin fatty acid esters, which are esters of dextrin and higher fatty acids; inulin fatty acid esters, which are esters of inulin and higher fatty acids; trimethylolpropane fatty acid esters, which are esters of trimethylolpropane and higher fatty acids; and sucrose fatty acid esters, which are esters of sucrose and higher fatty acids. Specific examples include, but are not limited to, sorbitan tristearate, dextrin isostearate, inulin stearate, trimethylolpropane triisostearate, and sucrose polystearate. Polyglycerol fatty acid esters, which are esters of glycerol and higher fatty acids with a degree of polymerization of 1 to 12, will be described later. Furthermore, as the ester of a saturated or unsaturated higher alcohol having 12 to 20 carbon atoms and an organic acid, one having a large number of carboxyl groups or hydroxyl groups in the organic acid skeleton is preferred, and examples thereof include, but are not limited to, monocarboxylic acid lactic acid which also has an alcohol group, dicarboxylic acid succinic acid or sebacic acid, dicarboxylic acid malic acid which also has an alcohol group, and tricarboxylic acid citric acid which also has an alcohol group. Esters having an organic acid skeleton which also has an alcohol group are more preferred. Specific examples include triisostearyl citrate and diisostearyl malate.

[0014] Among the surface treatment agents (A) used in the present invention, esters of saturated or unsaturated higher fatty acids having 12 to 20 carbon atoms and monohydric or polyhydric alcohols are particularly preferred, and polyglycerol fatty acid esters, which are esters of glycerol and higher fatty acids having a degree of polymerization of 1 to 12, are more preferred. Furthermore, esters of glycerol and higher fatty acids having a degree of polymerization of 2 to 10 are even more preferred. Specific examples include PG stearate, PG diisostearate, PG dioleate, glyceryl diisostearate, triisostearin, polyglyceryl-2 tetraisostearate, polyglyceryl-2 triisostearate, polyglyceryl-10 decaisostearate, polyglyceryl-10 decaestearate, and polyglyceryl-10 decaoleate. These can be used alone or in combination of two or more. Furthermore, polyglycerol fatty acid esters, which are the surface treatment agents (A) used in the present invention, are more preferably polyglyceryl-10 decaisostearate and polyglyceryl-2 tetraisostearate. Commercially available products include NIKKOL Decaglyn 10-ISV (ester substitution degree 80-90%) (manufactured by Nikko Chemicals Co., Ltd.) for polyglyceryl-10 decaisostearate, and Cosmol 44V (ester substitution degree 90-100%) (manufactured by The Nisshin Oillio Group Co., Ltd.) for polyglyceryl-2 tetraisostearate. The use of these surface treatment agents can reduce the polarity of the highly polar metal oxide surface, and their long carbon number provides excellent water resistance. Furthermore, they are preferred because they are easily dispersed in both oil and water phases, resulting in excellent color retention upon application.

[0015] The metal oxide having an average particle size of 0.01 to 1.0 μm used in component (A) of the present invention is not particularly limited, and any oxide commonly used in cosmetics can be used. Specifically, oxides of elements such as Al (aluminum), Mg (magnesium), Sn (tin), Zn (zinc), Co (cobalt), Fe (iron), Zr (zirconium), Ti (titanium), and Ce (cerium) can be used without any particular limitations in terms of shape or particle size. Examples include iron oxides such as yellow iron oxide, red iron oxide, and black iron oxide; titanium oxide; black titanium oxide; zinc oxide; aluminum oxide; magnesium oxide; chromium oxide; zirconium oxide; cerium oxide; tin oxide; titanium / titanium oxide sintered product; fluoride / hydroxide / oxide / Mg / K / silicon; and iron oxide / titanium oxide sintered product. One or more of these can be used. Among these, one or more selected from the group consisting of iron oxide, titanium oxide, black titanium oxide, zinc oxide, (titanium / titanium oxide) sintered product, and (iron oxide / titanium oxide) sintered product are preferred from the viewpoint of coloring effect and ultraviolet shielding ability, and one or more selected from the group consisting of iron oxide, titanium oxide, and zinc oxide are more preferred.

[0016] The amount of the surface treatment agent of the ester having an alkyl group containing 12 to 20 carbon atoms in component (A) of the present invention used for surface treatment of a metal oxide having an average particle size of 0.01 to 1.0 μm is not particularly limited, but is preferably 0.1% or more, more preferably 0.5% or more, and even more preferably 1.0% or more, based on the total amount of component (A). It is also preferably 10% or less, more preferably 5% or less, and even more preferably 3.0% or less. It is also preferably 0.1 to 10%, more preferably 0.5 to 5%, and even more preferably 1.0 to 3.0%. This range is more preferable because it provides good water resistance, minimizes discoloration upon application of the emulsion composition, and provides excellent dispersion stability at high temperatures.

[0017] Component (A) in the present invention can also be coated using other surface treatment agents. The other surface treatment agents are not particularly limited, and one or more may be used. Specific examples include alkoxysilanes, organic titanates, amino acids or derivatives thereof (e.g., acylamino acids or salts thereof), silicone oils, surfactants, metal soaps, higher fatty acids, higher alcohols, phospholipids, and ceramides.

[0018] The method for surface-treating component (A) in the present invention is not particularly limited, but any known treatment method conventionally used for modifying powders can be used. For example, a wet method using a solvent or a dry method in which treatment is performed in the gas phase can be used. In particular, mixing with a volatile solvent or oil and then dispersing or drying to form a fine powder is considered. In particular, rather than using the surface-treating agent as a dispersant or dispersion medium to disperse the surface-treating agent together with the metal oxide, it is more preferable to use a dried, finely powdered product, which is expected to ensure that the surface-treating agent is present on the metal oxide surface. Specific examples of volatile solvents that are preferred include alcohol solvents such as isopropyl alcohol, hydrocarbon solvents such as hexane and isododecane, and volatile silicone solvents such as dimethicone. Specifically, the metal oxide may be dispersed in a solvent, a hydrophobic treatment agent is added and dissolved by appropriate heating, and the mixture is uniformly stirred and mixed in a mixer such as a Henschel mixer, kneader, ultra mixer, bead mill, or roll mill to disperse or wet the mixture. Thereafter, the solvent is recovered or evaporated, and the mixture is dried and homogenized, and then pulverized, for example, by a device such as a jetmizer, atomizer, or grinder to produce a powder.

[0019] The average particle size of component (A) in the present invention is 0.01 μm or more, preferably 0.02 μm or more, and more preferably 0.03 μm or more. It is 1 μm or less, preferably 0.5 μm or less, and more preferably 0.3 μm or less. It is 0.01 to 1 μm, preferably 0.02 to 0.5 μm, and more preferably 0.03 to 0.3 μm.

[0020] The content of component (A) in the present invention is not particularly limited, but is preferably 0.1% or more, more preferably 0.5% or more, and even more preferably 1% or more, based on the total amount of the oil-in-water emulsion cosmetic. It is also preferably 30% or less, more preferably 20% or less, and even more preferably 15% or less. It is also preferably 0.1 to 30%, more preferably 0.5 to 20%, and even more preferably 1 to 15%. This range is more preferable because it minimizes discoloration upon application and provides superior dispersion stability at high temperatures.

[0021] The polyoxyalkylene alkyl ether phosphates and salts thereof having an alkyl group having 12 to 20 carbon atoms, component (B) used in the present invention, refer to products in which the terminals of higher alcohols or their polyoxyalkylene groups are phosphorylated, including salts in which the remaining hydroxyl groups are neutralized with an appropriate alkali. Examples of oxyalkylenes constituting the polyoxyalkylene residue include oxyalkylenes having 2 to 4 carbon atoms, such as oxyethylene, oxypropylene, and oxybutylene. Among these, polyoxyethylene is preferred as the polyoxyalkylene. The polyoxyalkylene may contain only one type of oxyalkylene, or two or more types of oxyalkylene. Among these, polyoxyethylene-added alkyl ether phosphates and salts thereof are preferred. The alkyl group having 12 to 20 carbon atoms may be linear or branched, and is not limited to saturated or unsaturated. The polyoxyalkylene alkyl ether phosphate may be a monoester, diester, or triester, or a mixture of two or more of these. Examples of polyoxyalkylene alkyl ether phosphate salts include inorganic salts, organic amine salts, and basic amino acid salts. Examples of inorganic salts include alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as magnesium salts and calcium salts; ammonium salts; aluminum salts; and zinc salts. Examples of organic amine salts include monoethanolamine salts, diethanolamine salts, and triethanolamine salts. Examples of basic amino acid salts include arginine salts and lysine salts. Specifically, the polyoxyalkylene alkyl ether phosphate is preferably one or more selected from the group consisting of polyoxyalkylene lauryl ether phosphate, polyoxyalkylene alkyl (C12-15) ether phosphate, polyoxyalkylene cetearyl ether phosphate, and salts thereof. Among these, the polyoxyalkylene alkyl ether phosphate is preferably one or more selected from the group consisting of polyoxyalkylene lauryl ether phosphate, polyoxyalkylene alkyl (C12-15) ether phosphate, polyoxyalkylene cetearyl ether phosphate, and salts thereof, more preferably one or more selected from the group consisting of laureth-4 phosphate, trilaureth-4 phosphate, (C12-15) pareth-3 phosphate, triceteareth-4 phosphate, and salts thereof, and even more preferably trilaureth-4 phosphate. Commercially available products include HOSTAPHAT KW340D and HOSTAPHAT KL340D (both manufactured by Clariant Japan K.K.), Nikkol DDP-8 (both manufactured by Nikko Chemicals Co., Ltd.), etc. One or more of these may be contained.

[0022] The phospholipids of component (B) used in the present invention refer to those having a structure in which fatty acids and phosphoric acid are bound to a central skeleton of glycerin or sphingosine, and an alcohol is further ester-bonded to the phosphoric acid. Fatty acids constituting phospholipids include saturated and unsaturated carboxylic acids having 7 to 22 carbon atoms, preferably 14 to 20 carbon atoms. Furthermore, alcohols constituting phospholipids often contain nitrogen, and examples of such alcohols include choline, ethanolamine, inositol, and serine. One or more of these may be contained.

[0023] The content of component (B) in the present invention is not particularly limited, but is preferably 0.01% or more, more preferably 0.05% or more, and even more preferably 0.1% or more, based on the total amount of the oil-in-water emulsion cosmetic. It is also preferably 1% or less, more preferably 0.75% or less, even more preferably 0.5% or less, and even more preferably 0.4% or less. It is also preferably 0.01 to 1%, more preferably 0.05 to 0.75%, even more preferably 0.1 to 0.5%, and even more preferably 0.1 to 0.4%. This range is preferable because it provides dispersion stability at high temperatures, minimizes discoloration upon application, and is gentle on the skin.

[0024] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is not particularly limited, but is preferably 5 or more, more preferably 10 or more, and even more preferably 20 or more. It is also preferably 800 or less, more preferably 500 or less, even more preferably 250 or less, and even more preferably 100 or less. It is also preferably 5 to 800, more preferably 10 to 500, and even more preferably 20 to 250. This range is more preferable because it results in little discoloration upon application and excellent water resistance and dispersion stability, particularly at high temperatures.

[0025] Component (C) in the present invention is a nonionic surfactant that does not contain a phosphate skeleton or a silicone skeleton. Component (C) in the present invention has the function of emulsifying the oily and aqueous components in an oil-in-water emulsion cosmetic or dispersing component (A), and does not contain the polyoxyalkylene alkyl ether phosphate having an alkyl group with 12 to 20 carbon atoms (B) or its salt, or the surface treatment agent for component (A). Component (C) is preferably a nonionic surfactant with an HLB of more than 3 but not exceeding 20, and more preferably an HLB of 4 or greater but not exceeding 18. Here, the HLB (hydrophile-lipophile balance) in the present invention is an index showing the balance between hydrophilicity and lipophilicity, and is calculated using the following formula (1) proposed by Oda and Teramura et al. HLB = inorganic value (IV) / organic value (OV) × 10 (Equation 1) (See Yoshio Koda, "Organic Conceptual Diagram - Fundamentals and Applications", pp. 11-17, Sankyo Publishing, 1984) Furthermore, it is more preferable to use a high HLB nonionic surfactant and a low HLB nonionic surfactant in combination. Here, low HLB refers to an HLB value of more than 3 and less than 8, and high HLB refers to an HLB value of 8 or more and 20 or less. Furthermore, it is more preferable that the total average HLB value of the nonionic surfactants including the component (B) is in the range of 8 to 14, but this is not particularly limited.

[0026] Component (C) in the present invention can be used without particular limitations on its structure, for example, ester type, ether type, etc. Specific examples include sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene hydrogenated castor oil, and polyoxyethylene fatty acid ethanolamides. Particularly preferred are sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, and polyoxyethylene hydrogenated castor oil. These are expected to enhance dispersion stability at high temperatures and minimize discoloration upon application.

[0027] In the component (C) of the present invention, preferred low HLB nonionic surfactants include, for example, PEG-30 dipolyhydroxystearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan dioleate, sorbitan monoisostearate, sorbitan diisostearate, sorbitan sesquiisostearate, sorbitan monostearate, sorbitan sesquistearate, and sorbitan distearate. POE(10) hydrogenated castor oil, PE dipolyhydroxystearate, G-30, glyceryl myristate, glyceryl stearate, glyceryl isostearate, glyceryl oleate, polyglyceryl-2 stearate, polyglyceryl-2 oleate, polyglyceryl-2 isostearate, polyglyceryl-2 diisostearate, polyglyceryl-4 stearate, polyglyceryl-4 oleate, polyglyceryl-6 tristearate, polyglyceryl-10 pentastearate, polyglyceryl-10 pentahydroxystearate, polyglyceryl-10 pentaisostearate, polyglyceryl-10 pentaoleate, and the like.

[0028] In addition, in the component (C) of the present invention, examples of the high HLB nonionic surfactant include POE (10) cholesteryl ether, POE (15) cholesteryl ether, POE (20) cholesteryl ether, POE (24) cholesteryl ether and POE (30) cholesteryl ether, polysorbate-60, polysorbate-65, polysorbate-80, polysorbate-85, POE (20) hydrogenated castor oil, POE (30) hydrogenated castor oil, and the like. Examples of suitable oleic acid esters include castor oil, POE (40) hydrogenated castor oil, POE (50) hydrogenated castor oil, POE (60) hydrogenated castor oil, POE (80) hydrogenated castor oil, POE (100) hydrogenated castor oil, POE (50) hydrogenated castor oil monoisostearate, ceteth-6, ceteth-7, ceteth-10, ceteth-15, ceteth-20, ceteth-23, ceteth-25, ceteth-30, ceteth-40, beheneth-5, beheneth-10, beheneth-20, beheneth-30, decaglyceryl monostearate, hexaglyceryl tristearate, tetraglyceryl monostearate, hexaglyceryl monostearate, decaglyceryl distearate, triglyceryl monomyristate, and polyglyceryl monolaurate.

[0029] The HLB value of component (C) in the present invention is as follows. The low HLB nonionic surfactant is at least one selected from the group consisting of sorbitan monooleate (HLB 4.5), sorbitan sesquioleate (HLB 4.0), sorbitan monoisostearate (HLB 5.0), sorbitan sesquiisostearate (HLB 4.0), sorbitan monostearate (HLB 4.5), sorbitan sesquistearate (HLB 4.0), and POE(10) hydrogenated castor oil (HLB 6.5). One or more kinds selected from the group consisting of sorbitan sesquioleate (HLB 4.0), sorbitan sesquiisostearate (HLB 4.0), and sorbitan sesquistearate (HLB 4.0) are preferred, and one or more kinds selected from the group consisting of sorbitan sesquioleate (HLB 4.0) and sorbitan sesquiisostearate (HLB 4.0) are more preferred, and one or more kinds selected from the group consisting of sorbitan sesquioleate (HLB 4.0) and sorbitan sesquiisostearate (HLB 4.0) are even more preferred. High HLB nonionic surfactants include polysorbate-60 (HLB 15), polysorbate-65 (HLB 10.5), polysorbate-80 (HLB 15), polysorbate-85 (HLB 11), POE(20) hydrogenated castor oil (HLB 10.5), POE(30) hydrogenated castor oil (HLB 11), POE(40) hydrogenated castor oil (HLB 12.5), POE(50) hydrogenated castor oil (HLB 13.5), POE(60) hydrogenated castor oil (HLB 14), and POE(80) hydrogenated castor oil. Hydrogenated castor oil (HLB 15), POE (100), hydrogenated castor oil (HLB 16.5), ceteth-6 (HLB 10.5), ceteth-7 (HLB 11.5), ceteth-10 (HLB 13.5), ceteth-15 (HLB 15.5), ceteth-20 (HLB 17), ceteth-23 (HLB 18), ceteth-25 (HLB 18.5), ceteth-30 (HLB 19.5), ceteth-40 (HLB 20), beheneth-5 (HLB 7), beheneth-10 (HLB 10), beheneth-20 (HLB 11.5), Preferably, one or more selected from the group consisting of polysorbate-60 (HLB 15), polysorbate-80 (HLB 15), POE (40) hydrogenated castor oil (HLB 12.5), POE (50) hydrogenated castor oil (HLB 13.5), POE (60) hydrogenated castor oil (HLB 14), POE (80) hydrogenated castor oil (HLB 15), ceteth-10 (HLB 13.5), ceteth-15 (HLB 15.5), ceteth-2 More preferred are one or more selected from the group consisting of Polysorbate-60 (HLB 15), Polysorbate-80 (HLB 15), POE(60) hydrogenated castor oil (HLB 14), POE(80) hydrogenated castor oil (HLB 15), Ceteth-15 (HLB 15.5), and Beheneth-20 (HLB 16.5).

[0030] The content of component (C) in the present invention is not particularly limited, but is preferably 0.1% or more, more preferably 0.3% or more, and even more preferably 0.5% or more, based on the total amount of the oil-in-water emulsion cosmetic. It is also preferably 3% or less, more preferably 1.5% or less, and even more preferably 1.0% or less. It is also preferably 0.1 to 3%, more preferably 0.3 to 1.5%, and even more preferably 0.5 to 1.0%. This range is more preferable because it provides better dispersion stability at high temperatures and water resistance.

[0031] The anionic water-soluble thickener (Component (D)) used in the present invention is a polymer that ionizes in water and becomes negatively charged, thickening the pigment or forming an aqueous gel. Heating, cooling, or neutralization may be performed as needed to form the gel. Furthermore, when dispersing or dissolving the polymer in water, it may be dispersed or dissolved using an aqueous solvent that dissolves in water, such as ethanol. Examples of water-soluble thickeners include water-soluble natural polymers and water-soluble synthetic polymers. The anionic water-soluble polymer (Component (D)) used in the present invention is expected to stably maintain emulsion droplets by thickening the polymer and further prevent pigment aggregation. By combining it with Component (B), which disperses pigments through steric hindrance and charge repulsion, the dispersibility and stability of the pigment can be dramatically improved, particularly at high temperatures. The improved dispersibility and stability are expected to contribute to minimal color change during application. Specific examples include polysaccharides having a carboxylic acid group such as a uronic acid / glucuronic acid skeleton, such as xanthan gum, carrageenan, sodium carboxymethylcellulose, gellan gum, Tremella fuciformis polysaccharide, and sodium alginate; polyamino acids and salts thereof, such as polyaspartic acid and polyglutamic acid; carboxyvinyl polymers and salts thereof; alkyl-modified carboxyvinyl polymers and salts thereof; and polymers having a (meth)acrylic acid skeleton, such as polymers having an acryloyldimethyltaurine skeleton.

[0032] In terms of usability, component (D) in the present invention is preferably a polymer having a (meth)acrylic acid skeleton. In particular, using a polymer structure containing acrylic acid or its salt as a monomer unit is more preferable because it provides superior dispersion stability at high temperatures when combined with component (A). For example, one or more selected from the group consisting of acrylic acid / alkyl methacrylate copolymer, (acrylates / beheneth methacrylate) copolymer, and (sodium acrylate / sodium acryloyldimethyltaurate) copolymer are more preferred.

[0033] The acrylic acid-alkyl methacrylate copolymer of component (D) in the present invention is a copolymer of a monomer selected from acrylic acid or methacrylic acid and their alkyl esters, and may further contain other monomers and may have a crosslinked structure. In addition to acrylic acid and methacrylic acid monomers, a copolymer containing a monomer selected from alkyl acrylate esters and alkyl methacrylate esters is preferred, and the content ratio and bonding style (e.g., block bonding, random bonding) are not limited. In the alkyl acrylate esters and alkyl methacrylate esters, the alkyl group of the alkyl ester preferably has 1 to 22 carbon atoms, more preferably 1 to 18 carbon atoms, in terms of dispersion stability at high temperatures. Examples of commercially available acrylic acid / alkyl methacrylate copolymers that can be used include PEMULEN TR-1, PEMULEN TR-2, Carbopol 1382, Carbopol ETD2020, Carbopol ULTREZ20, and Carbopol ULTREZ21 (all manufactured by Lubrizol Advanced Materials), Novethix L-10 (manufactured by Lubrizol Advanced Materials), and ACULYN 28 (manufactured by The Dow Chemical Group).

[0034] The component (D) in the present invention, sodium acrylate / sodium acryloyldimethyltaurate copolymer, is a copolymer of sodium acrylate and sodium acryloyldimethyltaurate, and corresponds to the substance described in the International Cosmetic Ingredient Dictionary as "sodium acrylate / sodium acryloyldimethyltaurate copolymer." This copolymer can be used alone or in a composition containing other components. Commercially available products such as SIMULGEL EG (manufactured by SEPPIC) can be used as this sodium acrylate / sodium acryloyldimethyltaurate copolymer.

[0035] The content of component (D) in the present invention is not particularly limited, but is preferably 0.001% or more, more preferably 0.01% or more, and even more preferably 0.1% or more. It is also preferably 1% or less, more preferably 0.5% or less, and even more preferably 0.3% or less. It is also preferably 0.001 to 1%, more preferably 0.01 to 0.5%, and even more preferably 0.1 to 0.3%. This range is more preferable because it provides excellent dispersion stability at high temperatures and prevents discoloration during application.

[0036] The present invention preferably further contains a volatile oil as component (E) from the viewpoint of water resistance and dispersion stability at high temperatures. Here, volatile refers to an oil having a boiling point of 260°C or less at normal pressure (1 atmosphere). The volatile oil is not particularly limited, but examples include silicone oil, hydrocarbon oil, and ester oil, and one or more of these can be used. More specifically, examples of such volatile hydrocarbon oils include low-molecular-weight methylpolysiloxanes (kinematic viscosity at 25°C of 1 to 5 CS), decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, dodecamethylcyclohexasiloxane, methyltrimethicone, decamethyltetrasiloxane, and ethyltrisiloxane; hydrocarbons having side chains such as isooctane, isododecane, isohexadecane, and isoeicosaene; straight-chain hydrocarbons such as decane, undecane, dodecane, tridecane, and (C9-12) alkanes; isoparaffin; and mixtures thereof. Examples of such volatile hydrocarbon oils include light liquid isoparaffin obtained by polymerizing or copolymerizing (preferably with a degree of polymerization of 4 to 6) isobutene, n-butene, and the like, followed by hydrogenation. One or more of these may be used.

[0037] Among the volatile oils for component (E), from the viewpoints of dispersion stability at high temperatures and suppression of adsorption of component (A) to the container, one or more selected from the group consisting of low-molecular-weight methyl polysiloxane, methyl trimethicone, saturated hydrocarbon oils having a side chain with 4 to 18 carbon atoms, isododecane, (C9-12) alkanes, tetradecane, isohexadecane, hydrogenated polyisobutene, and undecane / tridecane are preferred, and one or more selected from the group consisting of low-molecular-weight methyl polysiloxane, methyl trimethicone, undecane, and isododecane are more preferred.

[0038] Examples of commercially available products of component (E) in the present invention include KF-96L-1.5CS (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-96L-2CS (manufactured by Shin-Etsu Chemical Co., Ltd.), Silicone TMF-1.5 (manufactured by Shin-Etsu Chemical Co., Ltd.), IP Solvent 1620 MU, IP Solvent 2028 MU (both manufactured by Idemitsu Kosan Co., Ltd.), Isopar (manufactured by Esso Chemical Co., Ltd.), Marukasol R (manufactured by Maruzen Petrochemical Co., Ltd.), PARAFOL 12 RSPO-MB, PARAFOL 14 RSPO-MB (SASPL Germany GmbH), and the like, and these may be used alone or in combination of two or more.

[0039] The content of component (E) in the present invention is not particularly limited, but is preferably 0.1% or more, more preferably 0.5% or more, and even more preferably 1% or more, based on the total amount of the oil-in-water emulsion cosmetic. It is also preferably 20% or less, more preferably 10% or less, and even more preferably 5% or less. It is also preferably 0.1 to 20%, more preferably 0.5 to 10%, and even more preferably 1 to 5%. This range is more preferred because it provides excellent water resistance and dispersion stability at high temperatures.

[0040] The present invention can further contain component (F), a hydrophobic film-forming agent. The hydrophobic film-forming agent is one that dissolves or disperses in an oil and forms a film. Here, "forming a film" refers to the formation of a continuous film after applying a 40% solution of the resin in a volatile solvent in which the resin is soluble to a glass plate with a 400 μm thick applicator and drying at room temperature for 24 hours. The hydrophobic film-forming agent used in the present invention, component (F), is not particularly limited as long as it is one that can be used in ordinary cosmetics, and any can be used. Component (F) as a hydrophobic film-forming agent is not particularly limited, and examples thereof include cellulose-based resins such as ethyl cellulose and acetyl cellulose having a degree of substitution of 1.5 or more, acrylic acid-based resins such as alkyl acrylate / vinyl acetate resins and alkyl acrylate / styrene resins, polyvinyl-based resins such as polyvinyl isobutyl ether, polybutene, and polyisobutylene, silicone-based resins such as trimethylsiloxysilicate, polymethylsilsesquioxane, and acrylic-silicone graft copolymers, rosin acid-based resins such as rosin-modified phenolic resins and rosin esters (e.g., hydrogenated pentaerythrityl rosinate), hydrogenated abietic acid-based resins such as hydrogenated glyceryl abietic acid, and oil-soluble resins such as dextrin isostearate, candelilla resin, and carnauba extract. One or more of these may be used. Among these, cellulose-based resins, polyacrylic acid-based resins, silicone-based resins, and hydrogenated rosin acid esters are preferred, and one or more of these may be used. Furthermore, from the viewpoint of ease of handling, it is preferable that the component (F) is a solution or dispersion diluted with a solvent, or a solution or dispersion obtained by pre-mixing. It is more preferable that the component (F) is dispersed as an emulsion polymer in the solvent used to dilute or disperse the component (F) such as the component (E), water, or an aqueous component such as ethanol.

[0041] Among these, from the viewpoint of water resistance and dispersion stability at high temperatures, one or more selected from the group consisting of polyacrylic acid resins and silicone resins are preferred for component (F). More specifically, acrylate copolymers, (acrylates / alkyl (C1-18) acrylate / alkyl (C1-8) acrylamide) copolymer AMP, (acrylates / dimethicone) copolymers, etc., can be mentioned, and one or more of these can be used.

[0042] Commercially available products of component (F) in the present invention include, for example, ACULYN33A Rheology Modifier (manufactured by Dow-Toray Industries, Inc.), YODOSOL GH800F, YODOSOL GH810F (all manufactured by Nouryon Japan Co., Ltd.), Pluscise L-9716U, Pluscise L-9900, Pluscise L-9909B (all manufactured by GOO Chemical Industry Co., Ltd.), Silicon KP-541, Silicon KP-545, Silicon KP-550 (all manufactured by Shin-Etsu Chemical Co., Ltd.), and the like, and these can be used alone or in combination of two or more.

[0043] The content of component (F) in the present invention is not particularly limited, but is preferably 0.1% or more, more preferably 0.25% or more, and even more preferably 0.5% or more, based on the total amount of the oil-in-water emulsion cosmetic. It is also preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. It is also preferably 0.1 to 10%, more preferably 0.25% to 5%, and even more preferably 0.5 to 3%. This range is more preferred because it provides excellent water resistance and dispersion stability at high temperatures.

[0044] In addition to the above components (A) to (F), the oil-in-water emulsion cosmetic of the present invention may contain, as appropriate, aqueous components such as water, polyhydric alcohols, and lower alcohols that constitute the aqueous phase, or components typically used in oil-in-water emulsion cosmetics, to the extent that the effects of the present invention are not impaired. For example, the cosmetic may contain oils, surfactants other than components (B) and (C), water-soluble polymers other than component (D) and (C), UV absorbers, antioxidants, antibacterial agents, preservatives, pH adjusters, refreshing agents, powders other than component (A), cosmetic ingredients, fragrances, etc.

[0045] The oil phase in the present invention can contain an oil. In the present invention, the oil is not particularly limited, and is not limited to a solid oil, a paste oil, a liquid oil, or the like, and any of volatile oils and non-volatile oils can be used. The content of the oil in the present invention is not particularly limited, and can be increased or decreased according to the formulation, such as a water-in-oil type or an oil-in-water type.

[0046] The content of the oil in the present invention is preferably 1% or more, more preferably 3% or more, and even more preferably 5% or more, based on the total amount of the oil-in-water emulsion cosmetic. It is also preferably 30% or less, more preferably 25% or less, and even more preferably 20% or less. It is also preferably 1 to 30%, more preferably 3 to 25%, and even more preferably 5 to 20%.

[0047] The method for producing the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and the cosmetic can be prepared by a conventional method. For example, the following method can be mentioned. First, components (A) to (D), and optionally component (F), are mixed, and the optional components described above are added as needed, and the mixture is mixed to prepare an aqueous phase. Next, an oil phase is prepared to which component (E) and optional components have been added. Emulsification may be performed by adding the oil phase to the aqueous phase, or by adding the aqueous phase to the oil phase, while heating as necessary. It is preferable to add a dispersion obtained by wet-treating a metal oxide together with the surface treatment agent of component (A) as a dispersant or dispersion medium to the oil-in-water emulsion cosmetic as a component (A)-containing dispersion, in which the metal oxide surface has been previously treated with the surface treatment agent and temporarily powdered, to the oil-in-water emulsion cosmetic as component (A). Component (A) may be present in either the oil phase, the aqueous phase, or the interface, and there are no particular restrictions on the phase to which it is added, but from the perspective of preventing color change upon application in particular, it is more preferable to pre-disperse some or all of component (A) in the aqueous phase, and it is even more preferable to stabilize the dispersion together with components (B) to (D). Furthermore, while there are no particular restrictions on the presence or absence of component (A), powder with an average particle size of 0.01 to 0.1 μm in oil-in-water emulsion cosmetics is more preferably dispersed in the oil phase of the internal phase, as this provides the refreshing feel that is characteristic of oil-in-water emulsion cosmetics immediately after application and does not inhibit the thickening function of component (D).

[0048] The viscosity of the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but the viscosity at 25°C is preferably 500 mPa·s or more, more preferably 1,000 mPa·s or more, and even more preferably 3,000 mPa·s or more. It is also preferably 100,000 mPa·s or less, more preferably 80,000 mPa·s or less, and even more preferably 50,000 mPa·s or less. It is also preferably 500 to 100,000 mPa·s, more preferably 1,000 to 80,000 mPa·s, and even more preferably 3,000 to 50,000 mPa·s. This range is more preferable because it provides superior dispersion stability at high temperatures. The viscosity in the present invention can be measured using a Brookfield viscometer according to Method 2 of the Viscosity Measurement Methods for Cosmetic Raw Materials. For example, an oil-in-water emulsion cosmetic can be left to stand at 25°C for one day, and the viscosity can be measured using a Brookfield viscometer (manufactured by Eiko Seiki Co., Ltd.) under the following measurement conditions: rotor No. 4, 25°C, 6 rpm, and 1 minute.

[0049] The oil-in-water emulsion cosmetic of the present invention can be implemented in various forms, such as a solid, liquid, gel, emulsion, cream, two-layered, etc., and is not particularly limited. Furthermore, various formulations, such as an oil-in-water type and a water-in-oil-in-water type, are available, but the oil-in-water type is particularly preferred.

[0050] Examples of cosmetics include skin care cosmetics such as lotions, emulsions, creams, serums, massage products, packs, hand creams, body lotions, and body creams; makeup cosmetics such as sunscreens, lipsticks, primers, foundations, blushers, eye shadows, mascara, eyeliners, and concealers; and hair cosmetics such as hair tonics, shampoos, and conditioners. Sunscreen cosmetics and makeup cosmetics are preferred in terms of providing a moisturizing, glossy finish, and long-lasting makeup. Makeup cosmetics such as foundations, primers, eye colors, mascaras, and eyebrow makeup are particularly preferred, with colored cosmetics being even more preferred. Methods of application include application by hand, finger, puff, brush, or mat; application by impregnating nonwoven fabrics, sponges, or the like; and application by direct spraying. [Example]

[0051] Examples will be given below to specifically explain the present invention, but the present invention is not limited to these examples, etc. Furthermore, unless otherwise specified, the content is expressed in mass % relative to the composition in which the component is contained.

[0052] Examples 1 to 38 and Comparative Examples 1 to 9: Oil-in-water emulsion cream foundation Foundations having the compositions shown in Tables 1 to 4 were produced by the manufacturing method described below, and were evaluated for water resistance, dispersion stability at high temperatures, and color retention upon application by the methods described below. The results are also shown in Tables 1 to 4.

[0053] [Table 1] *1: PGQ TiO2 R250 (manufactured by Daito Chemical Industry Co., Ltd.) *2: PGQ RED No. 216P (manufactured by Daito Kasei Kogyo Co., Ltd.) *3: PGQ YELLOW YP1200P (manufactured by Daito Kasei Kogyo Co., Ltd.) *4: PGQ BLACK No.710P (manufactured by Daito Kasei Kogyo Co., Ltd.) *5:MP-1133 (manufactured by Teika) *6: R-516P (manufactured by Titanium Industries Co., Ltd.) *7: YP-1200P (manufactured by Titanium Industries Co., Ltd.) *8:BL-100P (manufactured by Titanium Industries Co., Ltd.) *9: NAI-Titanium MP-1133 (manufactured by Miyoshi Chemicals) *10: NAI-C338001-10 (Miyoshi Chemicals Co., Ltd.) *11: NAI-C339001-10 (Miyoshi Chemicals Co., Ltd.) *12:NAI-C337001-10 (manufactured by Miyoshi Kasei Co., Ltd.) *13: S Face KEH-1010 (manufactured by Sakamoto Pharmaceutical Co., Ltd.) treated at 2% *19:HOSTAPHAT KW340D (Clariant Japan) *23: Leodor AO-15V (Kao Corporation) *26: Silicon KP-545 (Shin-Etsu Chemical Co., Ltd.) *29: CARBOPOL 980 (manufactured by Lubrizol Advanced Materials Company A) *35: Sunsphere NP-100 (AGC Si-Tech)

[0054] [Table 2] *14: CR-50 (Ishihara Sangyo Kaisha) *15: OTS-2 TiO2 MP-1133 (manufactured by Daito Chemical Industry Co., Ltd.) *16: OTS-2 RED R-516P (manufactured by Daito Kasei Kogyo Co., Ltd.) *17: OTS-2 YELLOW YP-1200P (manufactured by Daito Kasei Kogyo Co., Ltd.) *18: OTS-2 BLACK BL-100P (manufactured by Daito Kasei Kogyo Co., Ltd.) *20:HOSTAPHAT KL340D (manufactured by Clariant Japan) *21: Nikkor DDP-8 (Nippon Surfactant Industries Co., Ltd.) *36: Resinol S-10EZ (Nikko Chemicals)

[0055] [Table 3] *22: KF-6028P (Shin-Etsu Chemical Co., Ltd.) *24: Nikkor Decagreen 1-SV (Nippon Surfactant Industries Co., Ltd.) *25: Nikkor HCO-10 (Nippon Surfactant Industries Co., Ltd.) *30: CARBOPOL 1382 (manufactured by Lubrizol Advanced Materials Co. A) *31: AQUPEC MG N40R (manufactured by Sumitomo Seika Chemicals) *32:Metolose 65SH4000 (Shin-Etsu Chemical Co., Ltd.) *33: Aquadew SPA-30B (Ajinomoto Co., Inc.) *34:GRINSTED XANTHAN CLEAR 80 (manufactured by DANISCO)

[0056] [Table 4] *27: SALCARE SC81UP (manufactured by BASF) *28: Plussize L-9716U (manufactured by Goo Chemical Industry Co., Ltd.): (36% pure ethanol solution, some triethylhexanoin, hydrogenated polyisobutene mixture)

[0057] (Manufacturing Method 1) (In Tables 1 to 4, only the raw materials listed in No. are to be blended.) A: Components (1) to (47) were dispersed in a three-roll mill. B: Components (48) to (66) were heated to 75°C and mixed uniformly. C: Components (67) to (75) were heated to 75°C. D: B was added to C at 75°C and emulsified, then cooled to 40°C. E: C was mixed with A and component (76) to obtain an oil-in-water emulsion cream foundation.

[0058] (Evaluation Method 1) (water resistance) A panel of 20 women in their 20s to 40s who had received training in sensory evaluation and were able to evaluate cosmetics according to a set standard was selected. The panel applied each sample to their forearms, and after one hour, they ran running water over the cosmetic film for 30 seconds. They then evaluated whether the cosmetic film remained attached to the skin on a 5-point scale using the following criteria. <Judgment criteria> Whether or not the cosmetic film was maintained was evaluated using the following five-point scale. (Judgment): (Evaluation) AA: 18-20 people felt that the makeup film was maintained A: 15-17 people felt that the makeup layer was maintained. B: 11-14 people felt that the makeup film was maintained. C: 6-10 people felt that the makeup film was maintained. D: 0-5 people felt that the makeup film was maintained

[0059] (Evaluation Method 2) (Dispersion stability at high temperatures) 30 g of each sample was filled into a No. 8 standard bottle and placed in a thermostatic chamber at 40°C. After one month, the bottle was removed from the thermostatic chamber and allowed to stand at 25°C for one hour, after which it was observed. Based on the results, the dispersion stability at high temperatures was evaluated according to the following criteria. <Judgment criteria> (Judgment): (Evaluation) AA: No change in appearance observed A: Almost no change in appearance is observed B: Slight separation is observed C: Slight separation and color unevenness are observed. D: Significant separation and color unevenness are observed

[0060] (Evaluation Method 3) (No color change upon application) A panel of 20 cosmetic evaluation experts spread each sample on their faces and visually evaluated whether the color tone was resistant to change during application, and the degree of change during application in hue, brightness, saturation, etc. They also evaluated color change one hour after application, and judged the changes in appearance over time using the following criteria. <Judgment criteria> (Judgment): (Evaluation) AA: 18-20 people noticed no change in color tone A: 15-17 people noticed no change in color tone B: 11-14 people noticed no change in color tone C: 6-10 people noticed no change in color tone D: 0-5 people noticed no change in color tone

[0061] As is clear from the results in Tables 1 to 4, the oil-in-water emulsion cream foundations of Examples 1 to 38 were superior to the oil-in-water emulsion cream foundations of Comparative Examples 1 to 9 in all aspects, including "water resistance," "dispersion stability at high temperatures," and "no color change upon application." On the other hand, Comparative Example 1, in which component (A) was replaced with an untreated metal oxide, and Comparative Example 2, in which component (A) was replaced with a metal oxide surface-treated with an acylated amino acid surface treatment agent, showed significantly poorer water resistance and dispersion stability at high temperatures, and the colorfastness upon application was also insufficient. Comparative Example 3, in which component (A) was replaced with a metal oxide surface-treated with a polyglycerol fatty acid ester having a low degree of ester substitution, and Comparative Example 4, in which component (A) was replaced with a metal oxide surface-treated with a polyglycerol fatty acid ester having a low carbon number, showed poor colorfastness upon application. Comparative Example 5, in which component (B) was replaced with a silicone surfactant, showed significantly poor dispersion stability at high temperatures. Comparative Example 6, in which component (B) was not blended, showed significantly poorer colorfastness upon application and insufficient dispersion stability at high temperatures. Comparative Example 7, in which component (C) was replaced with a silicone surfactant, showed significantly poorer dispersion stability at high temperatures. Comparative Example 8, in which component (C) was not blended, showed significantly poorer colorfastness upon application and insufficient dispersion stability at high temperatures. Comparative Example 9, which did not contain component (D), exhibited significantly poor dispersion stability at high temperatures and was not sufficiently free from color change upon application.

[0062] Example 39: Oil-in-water emulsion solid foundation (Component) (%) (1) Sucrose polystearate (HLB1)*37 0.3 (2) Sorbitan sesquioleate (HLB4)*23 0.5 (3) Polysorbate-85 (HLB11)*38 0.1 (4) Triceteareth-4 phosphate *19 0.1 (5) Hydrogenated lecithin *36 0.01 (6) Ethylhexyl methoxycinnamate 3 (7) Di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate *39 1 (8) Titanium dioxide *1 10 (9) Iron oxide *2-4 (ratio of 1:10:0.5) 1 (10) 5% dimethicone-treated aluminum hydroxide / silica-treated titanium dioxide microparticles (Average particle size 35nm) 3 (11) Ceramide NP 0.1 (12) Remaining purified water (13) (Acrylates / C10-30 alkyl acrylate) crosspolymer*30 0.3 (14) Acrylates copolymer *27 1.0 (15) (Acrylates / Alkyl (C1-18) Acrylate / Alkyl (C1-8) Acrylamide copolymer AMP 0.1 (16) Triethanolamine 0.4 (17) 1,3-butylene glycol 5 (18) Dipropylene glycol 0.1 (19) Glycerin 1 (20) Theanine 0.01 (21) Diglycerin 1 (22) Kanten *40 1 (23) Sodium acetyl hyaluronate 0.1 (24) Tremella fuciformis extract 0.1 (25) Carrageenan *41 0.01 (26) Xanthan gum *34 0.01 (27) Locust bean gum *42 0.01 (28)EDTA-2Na 0.03 (29) Citric acid 0.001 (30) Sodium citrate 0.001 *37: Cosmelike S-10 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) *38: Leodor TW-O 320V (Kao Corporation) *39: Eldew PS-304 (Ajinomoto Co., Inc.) *40: Ina Agar UP-37CS (manufactured by Ina Food Industry Co., Ltd.) *41: GENUVISCO carageenan type PJ-JPE (manufactured by CP Kelco) *42: GENU GUM TYPE RL-200J (CP Kelco)

[0063] (Manufacturing method) A: (A1: Components (1), a portion of (2) to (5), (6), and (7) are heated and mixed uniformly at 75°C.) (A2: Components (8) to (11) are further dispersed with a portion of (2) to (5) using a roller mill.) B: Components (17) to (30) and a portion of component (12) are heated to 80°C or higher to dissolve, and then a portion of component (12) and components (13) to (16) are heated and mixed uniformly at 75°C. C: Add A1 to B at 75°C and emulsify, then add A2 and the remaining component (12) and disperse it. Heat to 80°C, fill into a plastic container, and cool to 5°C to obtain an oil-in-water emulsified solid foundation.

[0064] The oil-in-water solid foundation obtained as described above was evaluated as follows: water resistance of the applied film: AA, no color change upon application: A, and dispersion stability at high temperatures: AA.

[0065] Example 40: Oil-in-water emulsion eye shadow (Component) (%) (1) Remaining purified water (2) 1,3-butylene glycol 15 (3) (Sodium acrylate / sodium acryloyldimethyltaurate) copolymer *43 0.4 (4) POE(80) hydrogenated castor oil (HLB15)*44 0.02 (5) Ceteth-15 (HLB 15.5) * 45 0.03 (6) Beheneth-20 (HLB 16.5) *46 0.03 (7) POE(60) hydrogenated castor oil (HLB14) *47 0.1 (8) ETDA-2Na 0.2 (9) Triethanolamine 1 (10) Xanthan gum *34 0.1 (11) Carbomer *29 1 (12) Tripropylene glycol *48 8 (13) Glycerin 2 (14) Ethanol 10 (15) Acrylates copolymer *27 0.1 (16) (Acrylates / C1-18 alkyl acrylate / C1-8 alkyl acrylamide) copolymer AMP *28 1.0 (17) Triceteareth-4 phosphate *19 0.1 (18) Sucrose polystearate *37 0.3 (19) Ceramide NG 0.2 (20) Stearic acid 0.8 (21) Behenyl alcohol 0.2 (22) Sorbitan sesquistearate (HLB 4.0) *23 0.05 (23) Sorbitan sesquiisostearate (HLB 4.0) *38 0.1 (24) Triethylhexanoin 5 (25) Black iron oxide *4 0.2 (26) Bengala *2 0.3 (27) Mica Titanium *49 10 (28) Red iron coated mica titanium *50 6 (29) Titanium oxide coated glass powder *51 4 (30) Titanium oxide coated synthetic phlogopite *52 8 (31) Aluminum powder *53 3 (32) Spherical silica (average particle size 10 μm) *54 2 (33)Fragrance 0.01 *43:SIMULGEL EG QD (SEPPIC) *44: NIKKOL HCO-80 (manufactured by Nikko Chemicals) *45: NIKKOL BC-15 (Nikko Chemicals) *46: NIKKOL BB-20 (Nikko Chemicals) *47: NIKKOL HCO-20 (manufactured by Nikko Chemicals) *48:TPG-H (ADEKA) *49: COSMETICA SUPER WHITE N-8000S (CQV) *50: BLONDIEE METALLIC GOLD N-2000S (CQV) *51: Microglass Metashine MT1080RR (Nippon Sheet Glass Co., Ltd.) *52:TWINCLEPEARL 450 (manufactured by Nihon Koken Kogyo Co., Ltd.) *53: COSMICOLOR CE TECLA GR (manufactured by Toyo Aluminum Co., Ltd.) *54: Sunsphere NP-100 (AGC Si-Tech)

[0066] (Manufacturing method) A: Components (1), part of (2) through (16) are heated and mixed uniformly at 80°C. B: Components (18) to (24) are heated and mixed uniformly at 80°C. C: A part of component (2), component (17), and components (25) to (27) are subjected to a roller treatment. D: B was added to A at 70°C and emulsified, then cooled to 35°C. C and components (28) to (33) were added and mixed, and the mixture was filled into an applicator container to obtain an oil-in-water eye shadow.

[0067] The oil-in-water eye shadow obtained in this manner had excellent water resistance when applied, no discoloration upon application, and dispersion stability at high temperatures.

[0068] Example 41: Oil-in-water emulsion lip cosmetic (Component) (%) (1) Gellan gum *55 0.5 (2) Purified water remaining amount (3) Carbomer *29 0.5 (4) Arginine *56 0.3 (5) EDTA-2Na 0.05 (6) Calcium chloride 0.03 (7) Phenoxyethanol 0.3 (8) 1,3-butylene glycol 10 (9) Glycerin 5 (10) Triceteareth-4 phosphate *19 0.3 (11) Yellow iron oxide *3 1.5 (12) Bengala *2 0.3 (13) Titanium dioxide *1 3 (14) Triceteareth-4 phosphate *19 0.1 (15) Sucrose polystearate *37 0.3 (16) Glyceryl monostearate *57 1.5 (17) Cetostearyl alcohol 1.5 (18) Lecithin *58 0.5 (19) Dimer Dilinoleic Acid (Phytosteryl / Isosteryl / Cetyl / Stearyl / Behenyl) *59 2 (20) Vaseline 5 (21) Glyceryl trioctanoate 3 (22) Polyvinyl acetate emulsion *60 5 (23) Acrylates copolymer *27 0.1 (24) (Acrylates / C1-18 alkyl acrylate / C1-8 alkyl acrylamide) copolymer AMP *28 0.1 *55: Kelcogel LT-100F (manufactured by Sumitomo Dainippon Pharma Co., Ltd.) *56: L-arginine (C) (Ajinomoto Co., Inc.) *57: Poem V-100 (Riken Vitamin Co., Ltd.) *58: J-Lecithin CL (manufactured by J-Oil Mills) *59: Plandool-S (manufactured by Nippon Fine Chemicals) *60: Vinybran GV-5651F (solid content 36.4%) (manufactured by Daido Chemical Industry Co., Ltd.)

[0069] (Manufacturing method) A. Component (1) is swelled uniformly with component (2). B. Disperse components (3) to (13) uniformly. C. Dissolve ingredients (14) to (21) by heating at 70°C. Mix DA and B and heat to 70°C, then add C and emulsify. The ED is cooled to 50°C, and components (22) to (24) are added and mixed. The FE was reheated and dissolved, filled into a transparent resin container, and then cooled to room temperature to obtain an oil-in-water emulsion lipstick (gel-like).

[0070] The oil-in-water emulsion lip cosmetic obtained in this manner exhibited water resistance of the applied film, no discoloration upon application, and dispersion stability at high temperatures. Example 42: Oil-in-water emulsified blush (Component) (%) (1) POE(80) hydrogenated castor oil (HLB15) *44 0.5 (2) Polyoxyethylene sorbitan tetraoleate 1 (3) Beeswax 10 (4) Cetyl 2-ethylhexanoate 0.5 (5) Trimethyltrimethicone 5 (6) Hydrogenated rosin acid pentaerythrityl *61 2 (7) Cetostearyl alcohol 0.5 (8) Triceteareth-4 phosphate *19 0.1 (9) Sucrose polystearate *37 0.3 (10) Remaining purified water (11) 1,2-Pentanediol 5 (12) Methyl parahydroxybenzoate 0.1 (13) Triethanolamine 1.5 (14) Acrylic acid / alkyl methacrylate copolymer *62 0.3 (15) Carbomer *29 0.5 (16) Acrylates copolymer *27 0.5 (17) (Acrylates / C1-18 alkyl acrylate / C1-8 alkyl acrylamide) copolymer AMP *28 0.5 (18) Pectin 0.4 (19) Agar *40 0.3 (20) (Dimethicone / vinyl dimethicone) crosspolymer mixture (solids content 5%) *63 10 (21) Purified water 5 (22) Titanium dioxide *1 5 (23) Bengala *2 0.5 (24) Yellow iron oxide *3 1 (25) Black iron oxide *4 0.1 (26) Mica Titanium *64 1 (27) Talc 10 (28)Fragrance 0.1 *61: Estergum HP (manufactured by Arakawa Chemical Industries, Ltd.) *62: Pemulen TR-1 (manufactured by NOVEON) *63: KSG-15 (Shin-Etsu Chemical Co., Ltd.) *64: Thymilon Super Gold (Merck)

[0071] (Manufacturing method) A: Heat ingredients (1) to (9) to approximately 90°C and mix uniformly. B: Add (10) heated to approximately 90°C to A, emulsify, and then cool. C: (20) to (21) are mixed uniformly. D: Mix B with (11)-(19), (22)-(28), and C. E:D was filled into a transparent glass container to obtain a blush.

[0072] The oil-in-water emulsified blush thus obtained had water resistance when applied, no discoloration upon application, and dispersion stability at high temperatures.

[0073] Example 43: Oil-in-water emulsion liquid foundation (Component) (%) (1) Sucrose polystearate (HLB1)*37 0.3 (2) POE(10) hydrogenated castor oil (HLB 6.5)*65 0.25 (3) Glyceryl monostearate*57 0.35 (4) Polyhydroxystearic acid 0.5 (5) Dimethicone 5% treated aluminum hydroxide / silica treated titanium dioxide particles (Average particle size 35nm) 1 (6) Dimethicone-triethoxycaprylylsilane 13% treated fine zinc oxide (average particle size 25 nm) *67 2 (7) Sorbitan sesquioleate (HLB4)*23 0.5 (8) Polysorbate-85 (HLB11)*38 0.1 (9) Triceteareth-4 phosphate *19 0.1 (10) Hydrogenated lecithin *36 0.3 (11) Titanium dioxide *1 10 (12) Iron oxide *2-4 (ratio of 1:10:0.5) 1 (13) Ceramide NP 0.1 (14) 1,3-butylene glycol 5 (15) Cellulose *68 1 (16) Stearic acid 1 (17) Behenyl alcohol 0.2 (18) Cetearyl alcohol 0.2 (19) Phytosteryl / Octyldodecyl Lauroyl Glutamate*66 0.5 (20) Cetyl 2-ethylhexanoate 2 (21) Dimethicone 2CS 1 (22) Methyl trimethicone 1 (23) Remaining purified water (24) (Acrylates / C10-30 alkyl acrylate) crosspolymer*30 0.3 (25) Acrylates copolymer *27 1.0 (26) (Acrylates / C1-18 alkyl acrylate / C1-8 alkyl acrylamide) copolymer AMP 0.1 (27) Triethanolamine 0.4 (28) Dipropylene glycol 0.1 (29) Glycerin 1 (30) Theanine 0.01 (31) Diglycerin 1 (32) Methylenebisbenzotriazolyltetramethylbutylphenol 40% water dispersion*69 5 (33) Sodium acetyl hyaluronate 0.1 (34) Tremella fuciformis extract 0.1 (35) Carrageenan *4 0.01 (36) Xanthan gum *34 0.01 (37) Locust bean gum *42 0.01 (38)EDTA-2Na 0.03 (39) Citric acid 0.001 (40) Sodium citrate 0.001 *65: Nikkor HCO-10 (Nikko Chemicals) *66: Eldew PS-203 (Ajinomoto Co., Inc.) *67: SALT-MZ-500 (13%) (Miyoshi Chemicals Co., Ltd.) *68: CELLULLOBEADS D-30 (manufactured by Daito Kasei Kogyo Co., Ltd.) *69: K22-M40 (manufactured by Dai Nippon Kasei Co., Ltd.)

[0074] (Manufacturing method) A: A1: Components (1) to (6). A2: Components (7) to (14) were each dispersed in a three-roll mill. B: Components (16) to (20) were heated to 75°C, and components (21), (22) and A1 were added and mixed uniformly. C: Components (23) to (31) were heated to 75°C. D: B was added to C at 75°C and emulsified, then cooled to 50°C, and A2, component (15), and components (32) to (40) were added and mixed to obtain an oil-in-water emulsion cream foundation.

[0075] The oil-in-water emulsion liquid foundation obtained in this manner exhibited water resistance of the applied film, no discoloration upon application, and dispersion stability at high temperatures.

Claims

1. The following components (A) to (D): (A) A metal oxide having an average particle size of 0.01 to 1.0 μm and coated with a surface treatment agent of an ester having an alkyl group having 12 to 20 carbon atoms, wherein the degree of ester substitution of the surface treatment agent is 60 to 100%. (B) One or more selected from polyoxyalkylene alkyl ether phosphates having an alkyl group having 12 to 20 carbon atoms and salts thereof, and phospholipids (C) A nonionic surfactant that does not contain a phosphate skeleton or a silicone skeleton (D) Anionic water-soluble thickener An oil-in-water emulsion cosmetic comprising:

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (B) is a polyoxyalkylene alkyl ether phosphate having an alkyl group having 12 to 20 carbon atoms or a salt thereof.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (C) is one or more selected from the group consisting of polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, and polyglycerin fatty acid ester.

4. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the surface treatment agent of component (A) is one or more selected from polyglycerol fatty acid esters.

5. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the component (D) has a (meth)acrylic acid skeleton.

6. The oil-in-water emulsion cosmetic according to claim 1 or 2, further comprising a volatile oil as component (E).

7. 3. The oil-in-water emulsion cosmetic according to claim 1, further comprising a hydrophobic film-forming agent as component (F).

8. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the mass ratio (A) / (B) of the content of said component (A) to the content of said component (B) is 5 to 800.

9. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the component (A) is contained in an aqueous phase.

10. The following components (A) to (D): (A) A metal oxide having an average particle size of 0.01 to 1.0 μm and coated with a surface treatment agent of a polyhydric alcohol ester having an alkyl group having 12 to 20 carbon atoms, wherein the degree of ester substitution of the surface treatment agent is 60 to 100%. (B) One or more selected from polyoxyalkylene alkyl ether phosphates having an alkyl group having 12 to 20 carbon atoms and salts thereof, and phospholipids (C) A nonionic surfactant that does not contain a phosphate skeleton or a silicone skeleton (D) Anionic water-soluble thickener An oil-in-water emulsion cosmetic comprising: The component (A) is contained in an aqueous phase, The oil phase contains a powder of the component (A) having an average particle size of 0.01 to 0.1 μm and / or a powder other than the component (A) having an average particle size of 0.01 to 0.1 μm. A method for producing an oil-in-water emulsion cosmetic.

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