Composite powder and method for producing same

Abstract

The present invention provides a composite powder having a high slippery feeling and a soft touch similar to those of a silicone elastomer. The present invention pertains to a composite powder containing (A) an oil-soluble component having a melting point of 80°C or higher, (B) an oil agent, and (C) a powder having an average particle diameter of 0.01-50 μm in a volume-based distribution. A composition containing (A) the oil-soluble component and (B) the oil agent is present on the surface of (C) the powder. The content of (A) is 3 mass% or more, and the total of the content of (A) and the content of (B) is 56 mass% or less.

Description

Composite powder and its manufacturing method

[0001] The present invention relates to a composite powder and a method for producing the same.

[0002] Powders are widely used in cosmetics to improve texture and optical properties. Spherical powders, in particular, are widely used in makeup cosmetics due to their unique rolling sensation and soft focus properties, which are derived from their shape. Among these spherical powders, silicone elastomers allow for precise control of particle shape. They are flexible and highly slippery due to their chemical structure, such as the main chain structure, the degree of functional group substitution on the main chain, and the molecular weight. They are used in a variety of makeup cosmetics. However, due to their low biodegradability, there are concerns about the impact on marine ecosystems if they are incorporated into cosmetics and then released into the environment. Therefore, efforts are underway to develop alternatives to silicone elastomers. For example, Japanese Patent Publication No. 7114149 proposes a block copolymer with polylactic acid blocks as its constituent units. However, this copolymer also contains a polysiloxane silicone initiator block, preventing it from completely replacing silicone species. Furthermore, JP 2024-508345 A proposes a biodegradable polymer composed of a silicone-free polyamine and an alkoxylated polyamine, but because it is a polymer, it cannot necessarily be said to be highly biodegradable. Furthermore, there is no mention of functions required for makeup cosmetics, such as rolling feel and soft focus. JP 2022-549917 A proposes a cosmetic composition containing a biodegradable polymer, but it is a composition composed of a latex polymer and cannot be said to have sufficient biodegradability. Furthermore, International Publication No. WO 2023 / 139987 proposes particles with excellent slip properties and a soft feel in response to requests for reducing environmental impact, but the particles are mainly composed of organic polymers such as polyvinyl resins, polyacrylic resins, and polystyrene resins, and cannot be said to satisfy the requirement for reducing environmental impact.

[0003] Japanese Patent No. 7114149 Special Publication No. 2024-508345 Special Publication No. 2022-549917 International Publication No. 2023 / 139987

[0004] The present invention aims to provide a composite powder having a high level of slipperiness and softness, such as that of a silicone elastomer, which is preferably a composite powder made of highly biodegradable and / or naturally derived components.

[0005] As a result of extensive research, the present inventors have found for the first time that the above-mentioned problems can be solved without using a polymer as a powder surface treatment agent by combining an oil-soluble component having a melting point of 80°C or higher, an oil agent, and a powder having a volume-based distribution average particle size of 0.01 μm to 50 μm, and have completed the present invention based on this finding. That is, the present invention is as follows: [1] A composite powder comprising: (A) an oil-soluble component having a melting point of 80°C or higher, (B) an oil agent, and (C) a powder having a volume-based distribution average particle size of 0.01 μm to 50 μm, wherein a composition containing the (A) oil-soluble component and the (B) oil agent is present on the surface of the (C) powder, the content of (A) is 3% by mass or more, and the sum of the contents of (A) and (B) is 56% by mass or less. [2] The composite powder according to [1] above, wherein (A) the oil-soluble component and (B) the oil agent are present in a mixed state on the surface of (C) the powder. [3] The composite powder according to [1] above or [2] above, wherein the (A) oil-soluble component is one or more selected from an oil gelling agent, an acylamino acid or a salt thereof, and a fatty acid metal salt. [4] The composite powder according to [3] above, wherein the (A) oil-soluble component contains an amino acid-based oil gelling agent as the oil gelling agent. [5] The composite powder according to [4] above, wherein the amino acid-based oil gelling agent is one or more selected from N-octanoyl-L-glutamic acid dibutylamide, N-2-ethylhexanoyl-L-glutamic acid dibutylamide, N-decanoyl-L-glutamic acid dibutylamide, and N-lauroyl-L-glutamic acid dibutylamide. [6] The composite powder according to [4], wherein the amino acid oil gelling agent is one or more selected from the group consisting of N-2-ethylhexanoyl-L-glutamic acid dibutylamide and N-lauroyl-L-glutamic acid dibutylamide. [7] The composite powder according to [3], wherein the oil-soluble component (A) contains, as the acyl amino acid, an N-acyl amino acid having an acyl group with a carbon chain length of C12 to C22.[8] The composite powder according to [3] above, wherein the oil-soluble component (A) comprises, as the acyl amino acid, one or more selected from N-lauroyl glutamic acid, N-myristoyl glutamic acid, N-palmitoyl glutamic acid, N-stearoyl glutamic acid, N-behenoyl glutamic acid, N-palmitoleyl glutamic acid, N-oleoyl glutamic acid, and N-linoleoyl glutamic acid. [9] The composite powder according to [3] above, wherein the oil-soluble component (A) comprises, as the fatty acid metal salt, a metal salt of a fatty acid having a carbon chain length of C8 to C22.

[10] The composite powder according to [3] above, wherein the oil-soluble component (A) comprises, as the fatty acid metal salt, a divalent metal salt.

[11] The composite powder according to any one of [1] to

[10] above, wherein the (B) oil comprises one or more selected from aliphatic alcohols, fatty acids, aliphatic esters, and waxes.

[12] The composite powder according to any one of [1] to

[11] above, wherein the (B) oil comprises one or more selected from aliphatic alcohols having a carbon chain length of C18 to C22 and fatty acids having a carbon chain length of C18 to C22.

[13] The composite powder according to any one of [1] to

[12] above, wherein the (B) oil content is 2 mass% or more.

[14] The composite powder according to any one of [1] to

[13] above, wherein the (C) powder is an organic powder and / or an inorganic powder.

[15] The composite powder according to any one of [1] to

[14] above, wherein the (C) powder is one or more selected from metal oxides, silica, starch, cellulose, and crystalline cellulose.

[16] The composite powder according to any one of [1] to

[15] above, wherein the oil absorption of the (C) powder is 10 ml / g or more.

[17] The composite powder according to any one of [1] to

[16] above, wherein the (C) powder contains silica.

[18] The composite powder according to any one of [1] to

[17] above, wherein the (C) powder contains porous silica.

[19] The composite powder according to any one of [1] to

[18] above, wherein the (C) powder contains spherical silica.

[20] The composite powder according to any one of [1] to

[19] above, wherein the (A) oil-soluble component and the (B) oil agent are in a mixed state and cover 80% or more of the surface of the (C) powder.

[21] The composite powder according to any one of [1] to

[20] above, wherein when 5 g of water is placed in a 10 mL glass vial and 30 mg of the composite powder is gradually added from above to the surface of the water, the composite powder floats on the water surface for 30 minutes or more.

[22] A cosmetic containing the composite powder according to any one of [1] to

[21] above.

[23] An emulsion composition containing the composite powder according to any one of [1] to

[21] above, and optionally containing an SPF enhancer.

[24] The emulsion composition according to

[23] above, further containing a UV absorber or a UV scattering agent.

[25] The emulsion composition according to

[23] or

[24] above, wherein the SPF value is improved by 10% or more compared to a control emulsion composition that is the same as the emulsion composition except that it does not contain the composite powder.

[26] A method for producing a composite powder comprising: (A) an oil-soluble component having a melting point of 80°C or higher; (B) an oil; and (C) a powder having an average particle size of 0.01 μm to 50 μm in its volumetric distribution; the method comprising: (i) a step of heat-mixing the (A) oil-soluble component and the (B) oil at 80°C or higher; and a step of heat-mixing the (A) oil-soluble component, the (B) oil, and the (C) powder at 80°C or higher; or (ii) a step of heat-mixing the (A) oil-soluble component, the (B) oil, and the (C) powder at 80°C or higher.

[27] A method for producing a composite powder comprising (A) an oil-soluble component having a melting point of 80°C or higher, (B) an oil agent, and (C) a powder having an average particle size of 0.01 μm to 50 μm in volumetric distribution, the method comprising a step of treating the surface of the (C) powder with the (A) oil-soluble component, and a step of treating the surface of the (C) powder with the (B) oil agent, both of which surface treatment steps comprise a step of heat-mixing.

[28] The production method according to

[27] above, in which the (A) oil-soluble component and the (C) powder are heat-mixed at 80°C or higher.

[29] The production method according to

[27] or

[28] above, in which the (B) oil agent and the (C) powder are heat-mixed at 80°C or higher.

[30] The method for producing a powder according to any one of

[27] to

[29] above, which comprises simultaneously carrying out a step of treating the surface of the powder (C) with an oil-soluble component (A) and a step of treating the surface of the powder (C) with an oil agent (B).

[31] The method for producing a powder according to any one of

[26] to

[30] above, which further comprises a step of cooling and mixing.

[32] The method for producing a powder according to

[31] above, wherein the cooling temperature is 80°C or lower.

[33] A method for producing a cosmetic, comprising a step of incorporating the composite powder according to any one of [1] to

[21] above into the cosmetic.

[34] The method for producing according to

[33] above, further comprising a step of incorporating an SPF enhancer into the cosmetic.

[35] The method for producing according to

[33] or

[34] above, wherein the cosmetic is an emulsion composition.

[36] A method for improving the SPF of a composition, comprising a step of adding the composite powder according to any one of [1] to

[21] above to the composition.

[37] The method according to

[36] above, wherein the composition is a cosmetic, preferably an emulsion composition.

[38] Use of the composite powder according to any one of [1] to

[21] above to improve SPF.

[39] Use according to

[38] above, comprising a step of adding the composite powder according to any one of [1] to

[21] above to the composition.

[40] Use according to

[39] above, wherein the composition is a cosmetic, preferably an emulsion composition.

[0006] 1 is an SEM image of the composite powder of the present invention.

[0007] The composite powder of the present invention comprises: (A) an oil-soluble component having a melting point of 80°C or higher; (B) an oil agent; and (C) a powder having an average particle size of 0.01 μm to 50 μm in a volume-based distribution; a composition containing the (A) oil-soluble component and the (B) oil agent is present on the surface of the (C) powder; the content of the (A) oil-soluble component is 3% by mass or more; and the sum of the content of the (A) oil-soluble component and the content of (B) is 56% by mass or less. The composite powder of the present invention is preferably one in which the composition containing the (A) oil-soluble component and the (B) oil agent is present on the surface of the powder in a mixed state, and in particular, the (A) oil-soluble component and the (B) oil agent may be present on the surface of the powder in a mixed state. "Present on the surface of the powder in a mixed state" means that the surface of the (C) powder is partially or completely covered in a mixed state. "Present on the surface of the powder in a mixed state" may mean that, in a mixed state, the (C) powder covers 70% or more, 80% or more, 90% or more, 95% or more, 97% or more, 98% or more, 99% or more, or 100% of the surface of the (C) powder. When the (C) powder is an inorganic powder such as silica, preferably, a composition containing an (A) oil-soluble component and a (B) oil agent may completely cover the surface of the (C) powder in a mixed state, or the (A) oil-soluble component and the (B) oil agent may completely cover the surface of the (C) powder in a mixed state. "Completely covering the surface of the (C) powder" means that the majority of the particles of the composite powder completely cover the surface of the (C) powder, and does not exclude cases where some particles of the composite powder do not completely cover the surface of the (C) powder. "Completely covering the surface of the (C) powder" may mean that substantially the entire surface of the (C) powder is covered. "Coating substantially the entire surface of the (C) powder" may mean that the surface is covered to an extent that heat resistance can be improved. Specifically, "improving heat resistance" may mean that the hot water resistance evaluated in the examples is "good." Furthermore, "coating substantially the entire surface of the (C) powder" may mean that the surface is coated to an extent that the water repellency of the composite powder can be improved. Specifically, "improving the water repellency of the composite powder" may mean that the water repellency is improved based on the water repellency evaluation described below.The surface coating state of the (C) powder can be evaluated by, for example, image analysis using a scanning electron microscope (SEM) or mapping of specific elements by elemental analysis using a scanning electron microscope-energy dispersive X-ray analyzer (SEM-EDS). Furthermore, the surface coating state of the (C) powder can be evaluated using HPLC or the like by dissolving the powder from the surface at high temperature (70°C) using a solvent such as ethanol. The presence of a composition containing an (A) oil-soluble component and an (B) oil agent on the surface of the (C) powder can improve the heat resistance of the composite powder compared to when only the (B) oil agent is present on the surface of the (C) powder. The presence of a composition containing an (A) oil-soluble component and an (B) oil agent on the surface of the (C) powder can improve the water repellency of the composite powder. The water repellency of the composite powder can be evaluated by floating the composite powder on the water surface for a certain period of time. For example, when 5 g of water is placed in a 10 mL glass vial and 30 mg of composite powder is gradually added from above to the water surface, the time for which the composite powder floats on the water surface is preferably 30 minutes or more, and more preferably 60 minutes or more. The time for which the composite powder floats on the water surface refers to the time for which most of the composite powder added to the water surface floats on the water surface. Specifically, it may be the time for which all of the composite powder added to the water surface floats on the water surface, or the time for which 80% or more, 90% or more, 95% or more, 98% or more, or 99% or more of the composite powder added to the water surface floats on the water surface. The time for which most of the composite powder added to the water surface floats on the water surface is preferably the time for which 95% or more of the composite powder added to the water surface floats, more preferably the time for which 98% or more of the composite powder added to the water surface floats, and even more preferably the time for which 99% or more of the composite powder added to the water surface floats. Furthermore, the time during which most of the composite powder added to the water surface floats on the water surface may be the time during which the composite powder added to the water surface does not sink at all or only a few pieces (1 to 2 pieces) sink.

[0008] The (A) oil-soluble component having a melting point of 80°C or higher is not particularly limited, but oil gelling agents, acylamino acids and their salts, fatty acid metal salts, etc. are preferred, and these may be used alone or in combination. The content of the (A) oil-soluble component having a melting point of 80°C or higher in the composite powder of the present invention is preferably 3% by mass or more, more preferably 4% by mass or more, even more preferably 5% by mass or more, and even more preferably 10% by mass or more. Furthermore, the content of the (A) oil-soluble component having a melting point of 80°C or higher is preferably 50% by mass or less, more preferably 45% by mass or less, even more preferably 40% by mass or less, and even more preferably 35% by mass or less. Furthermore, the content of (A) the oil-soluble component having a melting point of 80°C or higher may be any of the above-mentioned compatible combinations, and may be, for example, 3 to 50% by mass, 3 to 45% by mass, 3 to 40% by mass, 3 to 35% by mass, 4 to 50% by mass, 4 to 45% by mass, 4 to 40% by mass, 4 to 35% by mass, 5 to 50% by mass, 5 to 45% by mass, 5 to 40% by mass, 5 to 35% by mass, 10 to 50% by mass, 10 to 45% by mass, 10 to 40% by mass, or 10 to 35% by mass. As will be described later, the composite powder of the present invention can improve the SPF value of cosmetics and emulsion compositions, and (A) the oil-soluble component is an important component that contributes to improving the SPF value.

[0009] The oil gelling agent for the oil-soluble component (A) is not particularly limited as long as it has a hydrogen-bonding unit, but examples include amino acid-based oil gelling agents (oil gelling agents that are amino acid derivatives) and sugar fatty acid esters, with amino acid-based oil gelling agents being preferred. Specific examples of oil gelling agents include N-2-ethylhexanoyl-L-glutamic acid dibutylamide (trade name: EB-21), N-lauroyl-L-glutamic acid dibutylamide (trade name: GP-1), and palmitic acid dextrin (trade name: Leopearl KL2), with N-2-ethylhexanoyl-L-glutamic acid dibutylamide and N-lauroyl-L-glutamic acid dibutylamide being preferred. Furthermore, an oil gelling agent having an amide group may also be used. The oil gelling agent having an amide group is not particularly limited as long as it has one or more amide groups in its molecular structure and is capable of gelling an oily component, but amino acid-based oil gelling agents are preferably used, and N-acylamino acid alkylamides are a preferred example of an amino acid-based oil gelling agent. The N-acylamino acid alkylamide used in the present invention can be produced, for example, by reacting a long-chain fatty acid halide with an amino acid via the Schotten-Baumann reaction in the presence of a basic catalyst to produce an N-acylamino acid, and then heating the resulting N-acylamino acid with an amine derivative such as an alkylamine in the presence or absence of an acid catalyst. Alternatively, the N-acylamino acid alkylamide can be produced by reacting an amino acid with an amine derivative such as an alkylamine in the presence or absence of an acid catalyst, and then N-acylating the resulting amino acid amide with an acylating agent such as a fatty acid halide. Regarding N-acylalkylamide derivatives of amino acids having optical isomers, any of the L-, D-, and DL-configurations can be used, but the L-configuration N-acylalkylamide derivatives are more preferably used. For the purpose of the present invention, the N-acylamino acid alkylamide is more preferably an N-acylamino acid dialkylamide represented by the following formula (I):

[0010]

[0011] In formula (I), R 1 and R 2are the same or different and represent an alkyl group having 1 to 12 carbon atoms; R 3 represents a hydrocarbon group having 5 to 21 carbon atoms, and n is 1 or 2. In formula (I), R 1 and R 2 The alkyl groups having 1 to 12 carbon atoms represented by the formula (I) may be the same or different, and may be straight-chain or branched alkyl groups. Specific examples include methyl, ethyl, n-propyl, 1-methylethyl (isopropyl), n-butyl, 1-methylpropyl, 2-methylpropyl (isobutyl), 1,1-dimethylethyl (tert-butyl), n-pentyl, 3-methylbutyl (isopentyl), 1,1-dimethylpropyl, n-hexyl, 4-methylpentyl (isohexyl), n-heptyl, n-octyl, 6-methylheptyl (isooctyl), 2-ethylhexyl, n-nonyl, n-decyl, n-undecyl, and n-dodecyl. 1 and R 2 is preferably a linear or branched alkyl having 2 to 6 carbon atoms, more preferably a linear or branched alkyl having 3 to 5 carbon atoms, and most preferably n-butyl. 3 The hydrocarbon group having 5 to 21 carbon atoms represented by the formula (I) may be saturated or unsaturated, and may be a straight-chain hydrocarbon group, a branched-chain hydrocarbon group, or a cyclic hydrocarbon group. 3Examples of the acyl group represented by -CO- include n-hexanoyl, n-octanoyl, 2-ethylhexanoyl, n-nonanoyl, n-decanoyl, 10-undecenoyl, n-dodecanoyl (lauroyl), n-tetradecanoyl (myristoyl), n-hexadecanoyl (palmitoyl), 14-methylpentadecanoyl (isopalmitoyl), n-octadecanoyl (stearoyl), 16-methylheptadecanoyl (isostearoyl), cis-9-octadecenoyl (oleoyl), behenoyl, benzoyl, etc. As the acyl group, a linear or branched alkanoyl group having 8 to 18 carbon atoms and a linear or branched alkenoyl group having 8 to 18 carbon atoms are preferred, a linear or branched alkanoyl group having 8 to 12 carbon atoms is more preferred, and n-dodecanoyl and 2-ethylhexanoyl are particularly preferred. In formula (I), when n is 1, the acidic amino acid residue in the N-acylamino acid dialkylamide represented by formula (I) is L-aspartic acid, and when n is 2, the acidic amino acid residue is L-glutamic acid. From the viewpoint of exhibiting high gelling ability with respect to oily substances, n is preferably 2. Specific examples of the N-acylamino acid dialkylamide represented by formula (I) include N-octanoyl-L-glutamic acid dibutylamide, N-2-ethylhexanoyl-L-glutamic acid dibutylamide, N-decanoyl-L-glutamic acid dibutylamide, and N-lauroyl-L-glutamic acid dibutylamide, with N-2-ethylhexanoyl-L-glutamic acid dibutylamide and N-lauroyl-L-glutamic acid dibutylamide being particularly preferred. The N-acylamino acid dialkylamide represented by formula (I) is an N-acylamino acid dialkylamide represented by formula (I) in which R 1 , R 2 , and R 3 Depending on the type of R, it may further have one or more asymmetric carbon atoms. Any stereoisomers such as optical isomers and diastereomers based on such asymmetric carbon atoms may be used, and a racemate or a mixture of any stereoisomers may also be used. 1 , R 2 , and R 3When one or more of the N-acylamino acid dialkylamides have an olefinic double bond, either the Z-form or the E-form resulting from the configuration may be used, or a mixture of any geometric isomers may be used. Furthermore, the N-acylamino acid dialkylamide represented by the above formula (I) may be a hydrate or may be in any crystalline form.

[0012] Examples of the acylamino acid of the oil-soluble component (A) include N-acylamino acids having an acyl group with a carbon chain length of C8 to C22. The amino acid component constituting the N-acylamino acid having an acyl group with a carbon chain length of C8 to C22 may be any of acidic, neutral, and basic amino acids, and may also be any of α-, β-, and ε-amino acids. Examples include glycine, β-alanine, α-alanine, proline, valine, leucine, phenylalanine, 3,4-dioxyphenylalanine, serine, threonine, methionine, lysine, ornithine, arginine, histidine, ε-aminocaproic acid, glutamic acid, and aspartic acid. Glycine, β-alanine, α-alanine, proline, threonine, lysine, arginine, glutamic acid, and aspartic acid are more preferred, glycine, β-alanine, α-alanine, threonine, glutamic acid, and aspartic acid are more preferred, glycine, glutamic acid, and aspartic acid are even more preferred, glutamic acid and aspartic acid are even more preferred, and glutamic acid is most preferred. When an amino acid component having multiple amino groups (including imino groups) is used, it is sufficient that at least one amino group is acylated. For example, all of the amino groups may be acylated with multiple types of acyl components, or may be in the form of mono-N-acyl derivatives, with mono-N-acyl derivatives being preferred. Examples of the acyl component constituting the N-acyl group of an N-acylamino acid having an acyl group with a carbon chain length of C8 to C22 include acyl groups derived or derivable from linear or branched, saturated or unsaturated fatty acids having 8 to 22 carbon atoms, such as single fatty acid acyl groups such as octanoyl, caproyl, nonanoyl, caprinoyl, decanoyl, undecanoyl, lauroyl, myristoyl, palmitoyl, stearoyl, behenoyl, palmitoleoyl, oleoyl, and linoleoyl groups; naturally occurring mixed fatty acid acyl groups such as coconut oil fatty acid acyl, palm oil fatty acid acyl, and hardened beef tallow fatty acid acyl; and aromatic carboxylic acid acyl groups such as benzoic acid acyl. Such acyl groups can be derived from fatty acids, but they can also be derived from raw materials other than fatty acids (fatty acid esters, fatty acid salts, acid halides,The N-acylamino acid can also be derived in a similar manner from a saturated fatty acid anhydride or the like. The acyl component constituting the N-acyl group of an N-acylamino acid having an acyl group with a carbon chain length of C8 to C22 is preferably an acyl group that is derived or can be derived from a saturated fatty acid, and a straight-chain acyl group is preferred. N-acylamino acids having an acyl group with a carbon chain length of C12 to C22 are preferred, N-acylamino acids having an acyl group with a carbon chain length of C12 to C18 are more preferred, and N-acylamino acids having an acyl group with a carbon chain length of C14 to C18, C16 to C18, or C18 may also be used. Lauroyl group, myristoyl group, palmitoyl group, stearoyl group, behenoyl group, palmitoleyl group, oleoyl group, and linoleoyl group are preferred, lauroyl group, myristoyl group, palmitoyl group, and stearoyl group are more preferred, myristoyl group, palmitoyl group, and stearoyl group are even more preferred, and palmitoyl group and stearoyl group are even more preferred. As the N-acylamino acid having an acyl group with a carbon chain length of C8 to C22, N-lauroylglutamic acid, N-myristoylglutamic acid, N-palmitoylglutamic acid, N-stearoylglutamic acid, N-behenoylglutamic acid, N-palmitoleoylglutamic acid, N-oleoylglutamic acid, and N-linoleoylglutamic acid are preferred, N-lauroylglutamic acid, N-myristoylglutamic acid, N-palmitoylglutamic acid, and N-stearoylglutamic acid are more preferred, N-myristoylglutamic acid, N-palmitoylglutamic acid, and N-stearoylglutamic acid are even more preferred, and N-palmitoylglutamic acid and N-stearoylglutamic acid are even more preferred. Examples of salts of N-acylamino acids having an acyl group with a carbon chain length of C8 to C22 include pharmacologically acceptable salts, and examples thereof include alkali metal salts such as lithium salts, sodium salts, and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; ammonium salts; basic organic salts, and triethanolamine salts. Among these, from the viewpoint of solubility, sodium salts, potassium salts, and ammonium salts are preferred, sodium salts and potassium salts are more preferred, and sodium salts are even more preferred. In addition, in the case of polybasic acids such as dibasic acids, monosalts (monosodium glutamate, etc.),Specific examples of N-acylamino acids having an acyl group with a carbon chain length of C8 to C22 or salts thereof include lauroyl glutamic acid, sodium lauroyl glutamate, potassium lauroyl glutamate, myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, potassium palmitoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearo ... Examples of the oleoyl glutamate include potassium lauroyl glutamate, sodium oleoyl glutamate, potassium oleoyl glutamate, cocoyl glutamic acid, sodium cocoyl glutamate, disodium cocoyl glutamate, and potassium cocoyl glutamate, and preferred are lauroyl glutamic acid, sodium lauroyl glutamate, potassium lauroyl glutamate, myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, palmitoyl glutamate, and sodium lauroyl glutamate. Myristoyl glutamic acid, sodium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, potassium stearoyl glutamate, cocoyl glutamic acid, sodium cocoyl glutamate, disodium cocoyl glutamate, potassium cocoyl glutamate, more preferably myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, palmitoyl glutamate Preferred are potassium stearoyl glutamate, stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, potassium stearoyl glutamate, cocoyl glutamic acid, sodium cocoyl glutamate, disodium cocoyl glutamate, and potassium cocoyl glutamate, and more preferred are myristoyl glutamic acid, sodium myristoyl glutamate, potassium myristoyl glutamate, palmitoyl glutamic acid, sodium palmitoyl glutamate, potassium palmitoyl glutamate,These include stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and potassium stearoyl glutamate. By using these N-acyl amino acids as the N-acyl amino acid or salt thereof having an acyl group with a carbon chain length of C8 to C22, the oil dispersibility of the treated powder can be improved. The composite powder of the present invention may contain an acyl amino acid having a melting point of less than 80°C in an amount equal to or greater than the amount that results in a melting point of the mixture of (A) an acyl amino acid having a melting point of 80°C or higher being less than 80°C. For example, the composite powder of the present invention may contain acyl amino acids having a melting point of less than 80°C in an amount equal to or greater than 5%, 10%, 20%, or 30% of the oil-soluble component (A), and may not contain acyl amino acids having a melting point of less than 80°C.

[0013] Examples of fatty acid metal salts include metal salts of fatty acids having a carbon chain length of C8 to C22. By incorporating one or more selected from metal salts of fatty acids having a carbon chain length of C8 to C22, the oil dispersibility of the treated powder can be improved. Examples of fatty acids having a carbon chain length of C8 to C22 include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, arachidic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, erucic acid, hardened beef tallow fatty acid, coconut oil fatty acid, and palm oil fatty acid. From the viewpoint of increasing the melting point, saturated fatty acids having a carbon chain length of C8 to C22 are preferred, and straight-chain saturated fatty acids having a carbon chain length of C8 to C22 are more preferred. Fatty acids having a carbon chain length of C8 to C22 are preferably lauric acid, myristic acid, palmitic acid, and stearic acid, more preferably myristic acid, palmitic acid, and stearic acid, and even more preferably palmitic acid and stearic acid. Fatty acids having a carbon chain length of C8 to C20 are preferred, fatty acids having a carbon chain length of C14 to C18 are more preferred, fatty acids having a carbon chain length of C16 to C18 are even more preferred, and fatty acids having a carbon chain length of C18 are even more preferred. Furthermore, salts of fatty acids having a carbon chain length of C8 to C22 include pharmacologically acceptable salts, such as alkali metal salts such as lithium salts, sodium salts, and potassium salts; alkaline earth metal salts such as calcium salts, magnesium salts, and barium salts; aluminum salts; zinc salts; ammonium salts; basic organic salts, and triethanolamine salts. As salts of fatty acids having a carbon chain length of C8 to C22, divalent metal salts are preferred from the viewpoint of increasing the melting point. The metal salt is preferably a lithium salt, a calcium salt, a magnesium salt, a barium salt, an aluminum salt, a zinc salt, or the like, with calcium salts, magnesium salts, and zinc salts being more preferred.Preferred examples of fatty acid metal salts include zinc laurate, magnesium laurate, calcium laurate, zinc myristate, magnesium myristate, calcium myristate, zinc palmitate, magnesium palmitate, calcium palmitate, zinc stearate, magnesium stearate, and calcium stearate, with zinc palmitate, magnesium palmitate, calcium palmitate, zinc stearate, magnesium stearate, and calcium stearate being preferred. The composite powder of the present invention may contain a fatty acid metal salt having a melting point of less than 80°C in an amount sufficient to result in a melting point of less than 80°C when mixed with a fatty acid metal salt having a melting point of 80°C or higher of component (A). For example, the composite powder of the present invention may contain no more than 5%, 10%, 20%, or 30% of a fatty acid metal salt having a melting point of less than 80°C relative to component (A), and may be free of a fatty acid metal salt having a melting point of less than 80°C.

[0014] The (B) oil is not particularly limited, and any oil commonly used in cosmetics, pharmaceuticals, etc. can be used without particular restriction, including liquid oils, semi-solid oils, solid oils, etc., preferably liquid oils and semi-solid oils. Specific examples of liquid oils include linear or branched hydrocarbon oils such as liquid paraffin, light isoparaffin, liquid isoparaffin, hydrogenated (hydrogenated) polyisobutene, squalane, squalene, α-olefin oligomers, etc.; vegetable oils such as shea butter, almond oil, jojoba oil, olive oil, jojoba seed oil, corn germ oil, wheat germ oil, meadowfoam oil, sunflower oil, macadamia nut oil, etc.; animal fats and oils such as liquid lanolin; diisostearyl malate, isopropyl myristate, etc. Ester oils such as fatty acid esters and polyhydric alcohol fatty acid esters, such as glyceryl tri(caprylate / caprate), triisostearin, triethylhexanoin, isotridecyl isononanoate, cetyl ethylhexanoate, ethylhexyl palmitate, cetyl palmitate, isopropyl palmitate, tri(caprylic / capric acid)glyceryl, triisostearin, and triethylhexanoin; lauroyl sarcosinate isopropyl (ELDEW (registered trademark) SL-205), N-lauroyl-L-glutamate di(cholesteryl / octyldodecyl) acyl amino acid esters such as hexyl), hexyldecyl myristoylmethylaminopropionate, dihexyldecyl lauroyl glutamate, diisostearyl lauroyl glutamate, dioctyldodecyl lauroyl glutamate, bis(hexyldecyl / octyldodecyl) lauroyl glutamate, dioctyldodecyl lauroyl glutamate, and dioctyldodecyl stearoyl glutamate; phytosterol esters such as di(phytosteryl / 2-octyldodecyl) N-lauroyl-L-glutamate; silicone oils such as cyclohexasiloxane, cyclopentasiloxane, dimethylpolysiloxane, dimethylcyclopolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, higher alcohol-modified organopolysiloxane, and bisphenylpropyldimethicone; and silicone oils such as fluoropolyethers and fluorine-containing oils such as perfluoroalkyl ether silicones.Specific examples of semi-solid oil agents include cholesterol esters such as cholesteryl isostearate, cholesteryl hydroxystearate, macadamia nut oil fatty acid cholesteryl, and N-lauroyl-L-glutamic acid di(cholesteryl / behenyl / octyldodecyl); N-lauroyl-L-glutamic acid di(phytosteryl / behenyl / 2-octyldodecyl), myristoylmethyl-β-alanine(phytosteryl / decyltetradecyl)isostearate; Examples of solid oils include phytosterol esters such as phytosteryl oleate and phytosteryl oleate; dipentaerythritol fatty acid esters such as dipentaerythritol hexahydroxystearate and dipentaerythritol rosinate; triglycerides such as caprylic / capric triglyceride and caprylic / capric / myristic / stearic triglyceride; partially hydrogenated triglycerides such as hydrogenated oils; lanolin, lanosterols, and petrolatum. Specific examples of solid oils include animal waxes, vegetable waxes, mineral waxes, and synthetic waxes, such as rice bran wax, carnauba wax, candelilla wax, beeswax, cereal wax, ceresin, solid paraffin, microcrystalline wax, polyethylene wax, and polyolefin wax. Fatty alcohols, fatty acids, fatty esters, and waxes are preferred as the (B) oil, with saturated fatty alcohols and saturated fatty acids being more preferred. Furthermore, as the (B) oil agent, aliphatic alcohols having a carbon chain length of C18 to C22, fatty acids having a carbon chain length of C18 to C22, etc. are more preferred. The aliphatic alcohol is preferably a monohydric aliphatic alcohol. The aliphatic ester is preferably a fatty acid ester, more preferably a saturated fatty acid ester, specific examples of which include glycerin fatty acid ester, isononanoic acid ester, myristate ester, etc. The wax may be a plant-derived wax.Specific examples of (B) oil include preferably hexyldecanol, isostearyl alcohol, octyldodecanol, oleyl alcohol, propylene glycol, butylene glycol, pentylene glycol, isostearic acid, cetyl alcohol, behenyl alcohol, beeswax, microcrystalline wax, carnauba wax, candelilla wax, etc., more preferably butylene glycol, octyldodecanol, isostearic acid, isostearyl alcohol, cetyl alcohol, behenyl alcohol, beeswax, microcrystalline wax, carnauba wax, candelilla wax, etc., even more preferably butylene glycol, octyldodecanol, isostearic acid, isostearyl alcohol, cetyl alcohol, behenyl alcohol, and even more preferably isostearic acid, isostearyl alcohol, octyldodecanol, behenyl alcohol, etc. As (B) oil, a polyhydric alcohol having 3 to 6 carbon atoms or a polyhydric alcohol having 3 to 5 carbon atoms may be used. The oils may be used alone or in combination of two or more. For example, the oil (B) may contain one or more selected from aliphatic alcohols having a carbon chain length of C18 to C22 and fatty acids having a carbon chain length of C18 to C22, or may contain one or more selected from aliphatic alcohols having a carbon chain length of C18 to C22 and fatty acids having a carbon chain length of C18 to C22, and a polyhydric alcohol having 3 to 6 carbon atoms or a polyhydric alcohol having 3 to 5 carbon atoms.

[0015] The content of (B) oil in the composite powder of the present invention is preferably 2% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more. Furthermore, the content of (B) oil is preferably 50% by mass or less, more preferably 45% by mass or less, even more preferably 40% by mass or less, and even more preferably 35% by mass or less. The content of (B) oil may be any of the above-mentioned compatible combinations, such as 2 to 50% by mass, 2 to 45% by mass, 2 to 40% by mass, 2 to 35% by mass, 5 to 50% by mass, 5 to 45% by mass, 5 to 40% by mass, 5 to 35% by mass, 10 to 50% by mass, 10 to 45% by mass, 10 to 40% by mass, or 10 to 35% by mass. The mass ratio of the (A) oil-soluble component to the total mass of the (A) oil-soluble component and the (B) oil agent ((A) / (A)+(B)) is preferably 0.05 to 0.95, more preferably 0.1 to 0.93, even more preferably 0.1 to 0.5, and even more preferably 0.15 to 0.4. The content of the (A) oil-soluble component in a composition containing the (A) oil-soluble component and the (B) oil agent is preferably 5 to 95 mass%, more preferably 10 to 93 mass%, even more preferably 10 to 50 mass%, and even more preferably 15 to 40 mass%. The content of the (A) oil-soluble component in a composition containing the (A) oil-soluble component and the (B) oil agent may refer to the content of the (B) oil agent in a composition obtained by excluding the (C) powder from the composite powder of the present invention. Furthermore, the content of the (B) oil in a composition containing the (A) oil-soluble component and the (B) oil is preferably 5 to 95% by mass, more preferably 50 to 90% by mass, and even more preferably 60 to 85% by mass. The content of the (B) oil in a composition containing the (A) oil-soluble component and the (B) oil may refer to the content of the (B) oil in the composition excluding the (C) powder from the composite powder of the present invention. Furthermore, the total content (A + B) of the (A) oil-soluble component and the (B) oil in the composite powder of the present invention may be 3% by mass or more, and preferably 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more.Furthermore, the total content (A+B) of the oil-soluble component (A) and the oil agent (B) in the composite powder of the present invention may be 56% by mass or less, preferably 45% by mass or less or 40% by mass or less. The total content (A+B) of the oil-soluble component (A) and the oil agent (B) in the composite powder of the present invention may be any of the above-mentioned compatible combinations, for example, 3 to 56% by mass, 5 to 56% by mass, 10 to 56% by mass, 15 to 56% by mass, 20 to 56% by mass, 3 to 45% by mass, 5 to 45% by mass, 10 to 45% by mass, 15 to 45% by mass, 20 to 45% by mass, 3 to 40% by mass, 5 to 40% by mass, 10 to 40% by mass, 15 to 40% by mass, or 20 to 40% by mass. Furthermore, when the oil absorption of the (C) powder is 100 ml / g or less, the sum (A + B) of the content of the (A) oil-soluble component and the content of the (B) oil agent in the composite powder of the present invention may be preferably 40% by mass or less, more preferably 35% by mass or less, or may be 3 to 40% by mass, 5 to 40% by mass, 10 to 40% by mass, 15 to 40% by mass, 20 to 40% by mass, 3 to 35% by mass, 5 to 35% by mass, 10 to 35% by mass, 15 to 35% by mass, or 20 to 35% by mass. The oil absorption of the powder is measured by the refined linseed oil method (JIS K 5101-13-1:2004). By setting the sum of the content of the (A) oil-soluble component and the content of the (B) oil agent within this range, the powder does not form lumps during production, and a composite powder with a good feel can be obtained.

[0016] The melting point of the composition containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent is preferably 80°C or higher, more preferably 90°C or higher, even more preferably 95°C or higher, and even more preferably 100°C or higher. The melting point of the composition containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent is preferably 200°C or lower, more preferably 180°C or lower, even more preferably 160°C or lower, and even more preferably 140°C or lower. The melting point of the composition containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent may be higher than the melting point of (B) an oil agent by 10°C or more, 20°C or more, 30°C or more, or 40°C or more. The higher melting point of the composition containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent allows the composite powder of the present invention to stably maintain its properties even when heated during the cosmetic production process. The melting point of the composite powder of the present invention (a composite powder whose surface is coated with a composition containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent) is preferably 90°C or higher, more preferably 100°C or higher, even more preferably 105°C or higher, and even more preferably 110°C or higher. The melting point of the composite powder of the present invention is preferably 210°C or lower, more preferably 190°C or lower, even more preferably 170°C or lower, and even more preferably 150°C or lower. The melting point of the composite powder of the present invention may be higher by 10°C or higher, 20°C or higher, 30°C or higher, or 40°C or higher than the melting point of a composite powder in which the surface of (C) powder is coated with only (B) an oil agent. By increasing the melting point of the composition or composite powder containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent, the composite powder of the present invention can stably maintain its properties even when heated in the cosmetic manufacturing process. The composition containing (A) an oil-soluble component having a melting point of 80°C or higher and (B) an oil agent may also contain (C) a powder having a volumetric distribution average particle size of 0.01 μm to 50 μm, preferably in a dispersed state, in the composition. The (C) powder contained in the composition may be the same as the (C) powder on the surface of which the composition is present, or may be different from each other.

[0017] (C) Powders having an average particle size of 0.01 μm to 50 μm in a volumetric distribution are not particularly limited as long as they are used in industrial applications or cosmetics (pigments, colorants, resins, pearls), and examples thereof include organic powders and inorganic powders. The average particle size in a volumetric distribution of the powder is preferably 1 μm to 50 μm, and more preferably 5 μm to 30 μm. Here, the average particle size in a volumetric distribution of the powder is specified as per JIS standard (Z8819-2:2019).

[0018] Examples of inorganic powders include yellow iron oxide, red iron oxide, black iron oxide, fine iron oxide particles, bismuth oxychloride, zirconium oxide, magnesium oxide, chromium oxide, cobalt oxide, carbon black, ultramarine, Prussian blue, zinc oxide, fine zinc oxide particles, titanium oxide, fine titanium oxide particles, silica, porous silica, hollow silica, alumina, cerium oxide, boron nitride, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate, magnesium silicate, silicon carbide, pigments, lake, sericite, mica, talc, kaolin, clay, bentonite, plate-like barium sulfate, butterfly-like barium sulfate, hydroxyapatite, etc. These may be used alone or in combination of two or more. The inorganic powder may further be a composite of the above-mentioned materials (e.g., silica-coated titanium oxide, mica-coated titanium oxide, titanium-coated mica), or may be a material that has been surface-treated with the above-mentioned materials, such as silicone, fluorine compound, silane coupling agent, silane, organic titanate, fatty acid, acylamino acid (e.g., stearoyl glutamic acid), metal soap (e.g., aluminum stearate), oil, or amino acid (e.g., silicone-treated talc, silicone-treated mica, silicone-treated sericite, silicone-treated titanium oxide, silicone-treated red iron oxide, silicone-treated yellow iron oxide, silicone-treated black iron oxide, stearoyl glutamic acid-treated titanium oxide, stearoyl glutamic acid-treated yellow iron oxide, stearoyl glutamic acid-treated red iron oxide, stearoyl glutamic acid-treated black iron oxide, and aluminum stearate-treated titanium oxide). The inorganic powder is preferably a metal oxide such as iron oxide, titanium oxide, zinc oxide, or magnesium oxide, barium sulfate, calcium carbonate, or silica, and more preferably silica. As the silica, spherical or amorphous silica can be used, each of which may be porous, non-porous, hollow, or the like. Non-porous spherical silica and porous spherical silica are preferred, and porous spherical silica is more preferred. The average particle size of the volume-based distribution of the silica is preferably 1 to 50 μm, more preferably 3 to 20 μm, and even more preferably 5 to 12 μm.Silica is commercially available, and for example, porous silica beads SB-300 and SB-700 manufactured by Miyoshi Kasei Co., Ltd., and Sunsphere H-31, H-51, H-121, L-31, and L-51 manufactured by AGC Si-Tech Co., Ltd. can be used.

[0019] Examples of organic powders include polylactic acid, polyhydroxybutyric acid (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), polyglycolic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyethylene terephthalate succinate, and polybutylene adipate terephthalate. These powders are commercially available, and examples of such powders include Ecosoft 608XF, Ecosoft 608, Biosoft 915, and Naturematte 31 manufactured by Micro Powders, and Techpolymer BIO EF-A manufactured by Sekisui Plastics Co., Ltd. Other examples of organic powders include proteins, hydroxycarboxylic acid polyesters, polyhydroxyalkanoic acids, diolcarboxylic acid polyesters, alginic acid, and acyl lysine. Examples of proteins include silk, wool, and feathers. Silk powder is preferred as the protein powder. The silk powder is not particularly limited, and silk powder obtained by known methods can be used. Commercially available silk powders include silk powder manufactured by Izumi Senko Co., Ltd., N-Fibroin manufactured by Nagasuna Mayu Co., Ltd., and Silkgen G powder manufactured by Ichimaru Falcos Co., Ltd. Examples of hydroxycarboxylic acid polyesters include polylactic acid, polyglycolic acid, polycaprolactone, and glycolic acid-caprolactone copolymers. Examples of polyhydroxyalkanoic acids include polyhydroxybutyric acid (PHB), polyhydroxyvaleric acid, poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV), polyhydroxycaproic acid, polyhydroxycaprylic acid, PHBH composed of R-3-hydroxybutanoic acid (3HB) and R-3-hydroxyhexanoic acid (3HH), and modified polyvinyl alcohol. Examples of the diol carboxylic acid polyester include polyethylene succinate, polybutylene succinate, polyethylene terephthalate succinate, polybutylene adipate terephthalate, etc. Examples of the alginic acid include calcium alginate.Examples of the acyl lysine include octanoyl lysine and lauroyl lysine. Other examples of organic powders include cellulose, starch, modified starch, cellulose derivatives, chitosan, and the like. Here, cellulose, crystalline cellulose, starch, modified starch, and cellulose derivatives are preferred, with cellulose, crystalline cellulose, and starch being more preferred, and cellulose being particularly preferred. Examples of the cellulose include plate-shaped cellulose, spherical cellulose, and amorphous cellulose. Examples of plate-shaped cellulose include plate-shaped crystalline cellulose and needle-shaped crystalline cellulose, with spherical cellulose being preferred. Examples of spherical cellulose include spherical crystalline cellulose and amorphous cellulose. Examples of spherical cellulose include nonporous cellulose and porous cellulose, with porous cellulose being preferred. Here, spherical includes true sphere, nearly spherical, and elliptical. Cellulose registered under the INCI names of crystalline cellulose, cellulose acetate, and lignin can be used. Cellulose is commercially available, and examples thereof include TEGO Feel Green manufactured by Evonik and CELLULOBEADS D-10 and CELLULOBEADS D-5 manufactured by Daito Kasei Kogyo Co., Ltd. Examples of the starch include starches derived from rice, corn, potato, tapioca, barley, etc., as well as pregelatinized and partially pregelatinized starches thereof. Starches derived from tapioca, barley, and rice are preferred. The shape of the starch may be spherical or irregular, with spherical being preferred. Here, spherical includes true sphere, approximately spherical, and ellipsoid. Starch is commercially available, and examples of starch that can be used include tapioca-derived starches such as Tapioca Natural 9096 manufactured by AGRANA, TAPIOCA PURE manufactured by Nouryon Japan, and A60012 ORGANIC TAPIOCA STARCH POWDER manufactured by Active Concepts, barley-derived starch such as Barley Natural manufactured by AGRANA, and rice-derived starch such as Fine Snow IR manufactured by Joetsu Starch Co., Ltd. and Resista Natural manufactured by AGRANA.The modified starch includes starch phosphate and alkylated starch, and the cellulose derivative includes cellulose acetate. The chitosan includes chitosan derived from crab, shrimp, krill, etc. Preferably, it is chitosan derived from crab or shrimp. Chitosan can be commercially obtained, for example, K45 manufactured by Izumi Senko Co., Ltd., which is chitosan derived from the shell of red snow crab.

[0020] The (C) powder may preferably contain one or more selected from metal oxides, barium sulfate, calcium carbonate, silica, starch, cellulose, and crystalline cellulose, and more preferably one or more selected from silica, starch, cellulose, and crystalline cellulose. The (C) powder may also preferably contain silica. The (C) powder may also preferably contain porous silica. The (C) powder may also preferably contain spherical silica. The oil absorption of the (C) powder is preferably 10 ml / g or more, and more preferably 25 to 300 ml / g. The oil absorption of the powder is measured by the refined linseed oil method (JIS K 5101-13-1:2004).

[0021] The composite powder of the present invention is preferably a composite powder composed of biodegradable components and / or naturally-derived components. The biodegradable components are preferably components that exhibit biodegradability in a biodegradability test. The biodegradability test method used may be the ASTM D6400 test method, the ISO 17088 test method, the ISO-TG301F test method, or the OCED 306 test method. In the present invention, "exhibiting biodegradability" means exhibiting biodegradability in at least one of these test methods. In the composite powder of the present invention, the (A) oil-soluble component and the (B) oil agent may be components that exhibit biodegradability. Furthermore, the (C) powder may be a component that exhibits biodegradability or a naturally-derived component.

[0022] The composite powder of the present invention can be obtained by a production method including the steps of: heat-mixing (A) the oil-soluble component and (B) the oil at 80°C or higher; and heat-mixing (A) the oil-soluble component, (B) the oil, and (C) the powder at 80°C or higher. In this production method, the (A) oil-soluble component and (B) the oil are first heat-mixed before being mixed with the (C) powder. The heating temperature when heat-mixing (A) the oil-soluble component and (B) the oil is 80°C or higher, preferably 80 to 200°C, and more preferably 80 to 160°C. The time for heat-mixing (A) the oil-soluble component and (B) the oil is 5 minutes or more, preferably 10 minutes or more. The time for heat-mixing (A) the oil-soluble component and (B) the oil may be preferably 5 minutes to 360 minutes, and more preferably 10 minutes to 150 minutes. Furthermore, the heating temperature when the (A) oil-soluble component, the (B) oil agent, and the (C) powder are heat-mixed is 80°C or higher, preferably 90°C or higher, and more preferably 100°C or higher. The heating temperature when the (A) oil-soluble component, the (B) oil agent, and the (C) powder are heat-mixed may be 80°C to 200°C, preferably 90°C to 200°C, more preferably 100°C to 200°C, and even more preferably 100°C to 160°C. The time for heat-mixing the (A) oil-soluble component, the (B) oil agent, and the (C) powder is preferably 30 minutes or longer, and more preferably 60 minutes or longer. The time for heat-mixing the (A) oil-soluble component, the (B) oil agent, and the (C) powder may be preferably 30 minutes to 600 minutes, and more preferably 60 minutes to 360 minutes.The heating and mixing may be carried out using a mixer selected from high-speed agitation mixers such as a Nauta mixer, Henschel mixer, conical dryer, planetary mixer, FM mixer, high-shear mixer, vertical mixer, and planetary mixer, agitation mixer granulators such as a vertical granulator and a high-speed mixer, container rotation mixers or container rotation mixers with agitators such as a W-type mixer, CV-type mixer, V-type mixer, rocking mixer, container mixer, Bohle mixer, and chopper-equipped container mixer, paddle mixer, ribbon agitation type, double-shaft paddle type, double-shaft planetary agitation type, Nauta mixer, conical screw-type mechanical agitation mixer, air current agitation mixer, Julia mixer, and Nobilta, and other compression / shear / impact mixers. The oil-soluble component (A) and the oil agent (B) may also be mixed by dropwise mixing or spraying. In the composite powder obtained by the above-mentioned production method, the composition containing (A) the oil-soluble component and (B) the oil agent is present in a mixed state on the surface of (C) the powder.

[0023] The composite powder of the present invention can also be obtained by a production method including a step of heat-mixing the (A) oil-soluble component, the (B) oil, and the (C) powder at 80° C. or higher without previously mixing the (A) oil-soluble component and the (B) oil. In this case, the (C) powder and the (A) oil-soluble component may be mixed, and then the (B) oil may be added, and then the (A) oil-soluble component, the (B) oil, and the (C) powder may be heat-mixed at 80° C. or higher; the (C) powder and the (B) oil may be mixed, and then the (A) oil-soluble component may be added, and then the (A) oil-soluble component, the (B) oil, and the (C) powder may be heat-mixed at 80° C. or higher; or the (A) oil-soluble component and the (B) oil may be simultaneously added to the (C) powder, and then the (A) oil-soluble component, the (B) oil, and the (C) powder may be heat-mixed at 80° C. or higher. The heating temperature when the (A) oil-soluble component, the (B) oil agent, and the (C) powder are heat-mixed is 80°C or higher, preferably 90°C or higher, and more preferably 100°C or higher. The heating temperature when the (A) oil-soluble component, the (B) oil agent, and the (C) powder are heat-mixed may be 80°C to 200°C, preferably 90°C to 200°C, more preferably 100°C to 200°C, and even more preferably 100°C to 160°C. The heat-mixing method is as described above. The time for heat-mixing the (A) oil-soluble component, the (B) oil agent, and the (C) powder is preferably 10 minutes or longer, more preferably 30 minutes or longer, and even more preferably 60 minutes or longer. The time for heat-mixing the (A) oil-soluble component, the (B) oil agent, and the (C) powder is preferably 10 to 600 minutes, and more preferably 60 to 360 minutes. In the composite powder obtained by the above-mentioned production method, a composition containing (A) an oil-soluble component and (B) an oil agent is present on the surface of (C) the powder.

[0024] The composite powder of the present invention can also be obtained by a production method including a step of treating the surface of (C) the powder with (A) an oil-soluble component and a step of treating the surface of (C) the powder with (B) an oil agent. The step of treating the surface of (C) the powder with (A) an oil-soluble component includes a heat-mixing step. The heating temperature in the heat-mixing is preferably 80°C or higher, more preferably 90°C or higher, and even more preferably 100°C or higher. The heating temperature in the heat-mixing may be 80°C to 200°C, preferably 90°C to 200°C, more preferably 100°C to 200°C, and even more preferably 100°C to 160°C. The heat-mixing time is preferably 10 minutes or longer, more preferably 30 minutes or longer, and even more preferably 60 minutes or longer. The heat-mixing time is preferably 10 minutes to 600 minutes, more preferably 60 minutes to 360 minutes. The step of treating the surface of (C) the powder with (B) an oil agent includes a heat-mixing step. The heating temperature in the heat mixing is preferably 80°C or higher, more preferably 100°C or higher. The heating temperature in the heat mixing may be preferably 100 to 200°C, more preferably 100 to 160°C. The heat mixing time is preferably 10 minutes or longer, more preferably 30 minutes or longer, and even more preferably 60 minutes or longer. The heat mixing time is preferably 10 minutes to 600 minutes, more preferably 60 minutes to 360 minutes. The heat mixing method is as described above. Furthermore, the step of treating the surface of the (C) powder with the (A) oil-soluble component and the step of treating the surface of the (C) powder with the (B) oil agent may be carried out simultaneously. In the composite powder obtained by the above production method, a composition containing the (A) oil-soluble component and the (B) oil agent is present in a mixed state on the surface of the (C) powder.

[0025] Any of the above production methods may further include a cooling-mixing step following any or all of the heating-mixing steps. The cooling temperature in the cooling-mixing step is preferably 80°C or lower, more preferably 70°C or lower, and even more preferably 60°C or lower. The cooling temperature in the cooling-mixing step may be preferably 25 to 80°C, more preferably 25 to 70°C, and even more preferably 25 to 60°C. The cooling-mixing time is preferably 10 minutes or longer, more preferably 15 minutes or longer, and even more preferably 30 minutes or longer. The cooling-mixing time may be 10 to 360 minutes, preferably 15 to 360 minutes, and even more preferably 60 to 360 minutes. The cooling-mixing method may be natural cooling, but to increase efficiency, the container may be immersed in cooling water (which may be ice water) or, if the container is a jacketed device, cooling may be performed by running cooling water through it. Furthermore, in any of the above production methods, the characteristics of the composite powder of the present invention described above can be applied to the composite powder produced by the production method. In other words, the above-described features of the composite powder of the present invention can be interpreted as the features of the above-described manufacturing methods. For example, in any of the above-described manufacturing methods, the preferred aspects of the content and mass ratio of each component of the composite powder can be applied to the preferred aspects of the amount of each component added in the manufacturing method.

[0026] The present invention provides a cosmetic containing the above-described composite powder of the present invention. The present invention also provides a method for producing a cosmetic, comprising the step of adding the above-described composite powder of the present invention. The cosmetic produced by this production method may preferably be an emulsion composition. The addition of the composite powder of the present invention to a control composition can improve its SPF value compared to a control composition not containing the composite powder of the present invention. That is, the composite powder of the present invention can function as an SPF enhancer. The SPF improvement achieved by adding the composite powder of the present invention is preferably an SPF value improvement of 10% or more, more preferably 15% or more, even more preferably 20% or more, even more preferably 50% or more, even more preferably 70% or more, particularly preferably 90% or more, and most preferably 100% or more, compared to the control composition. The present invention also provides a method for improving the SPF of a composition, comprising the step of adding the composite powder of the present invention to the composition. That is, the composite powder of the present invention can be used to improve the SPF of a composition by adding it to the composition. The composition to which the composite powder of the present invention is added to improve the SPF may preferably be a cosmetic, and more preferably an emulsion composition. The SPF value can be measured, for example, in accordance with ISO 24444. For example, the cosmetic may be weighed out onto a polymethyl methacrylate plate, applied evenly with the pad of a finger, and then measured with an SPF analyzer.

[0027] Cosmetics containing the composite powder of the present invention may contain, in addition to the composite powder of the present invention, any component acceptable for use in cosmetics. Furthermore, the composite powder of the present invention can be used in any cosmetic as a cosmetic ingredient. The cosmetic may contain, for example, one or more selected from the group consisting of ultraviolet absorbers and ultraviolet scattering agents. Any ultraviolet absorber can be used without particular limitation as long as it has the ability to absorb ultraviolet light and is usable in skin compositions such as pharmaceuticals and cosmetics. Examples of absorbers for mid-wavelength ultraviolet rays (UVB) include cinnamic acid derivatives such as 2-ethylhexyl paramethoxycinnamate and 2-ethoxyethyl 3-(4-methoxyphenyl)propenoate (cinoxate); salicylic acid derivatives such as 2-ethylhexyl salicylate, homomenthyl salicylate, and 3,3,5-trimethylcyclohexyl salicylate (homosalate); triazine derivatives such as 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine; 2-phenyl-1H-benzimidazole-5-sulfonyl benzoate; benzylidene camphor derivatives such as 3-(4-methylbenzylidene)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one (methylbenzylidene camphor); hydantoin derivatives such as 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate; 1-(3,4-dimethoxyphenyl)-4,4-dimethyl-1,3-pentanedione; and silicone-based ultraviolet absorbers such as diethyl 4-propynyloxybenzalmalonate-modified dimethylpolysiloxane (polysilicone-15). Examples of absorbers for long wavelength ultraviolet rays (UVA) include dibenzoylmethane derivatives such as 4-tert-butyl-4'-methoxydibenzoylmethane; benzoic acid derivatives such as 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoic acid hexyl ester; and benzylidene camphor derivatives such as terephthalylidene dicamphorsulfonic acid.Examples of absorbers for mid-wavelength ultraviolet (UVB) and long-wavelength ultraviolet (UVA) rays include benzophenone derivatives such as 2-hydroxy-4-methoxybenzophenone (oxybenzone) and 2-hydroxy-4-methoxybenzophenone sulfonic acid; 2-cyano-3,3-diphenyl-2-propenoic acid 2-ethylhexyl (octocrylene); hydroxyphenylbenzotriazole derivatives such as 2-(2H-indazol-2-yl)-4-methyl-6-[2-methyl-3-[methyldi(trimethylsilyloxy)silyl]propyl]phenol; phenyltriazine derivatives such as 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine; cinnamic acid derivatives such as 3-(3-methoxy-4-hydroxyphenyl)propenoic acid (ferulic acid); and methylenebisbenzotriazolyltetramethylbutylphenol. In the present invention, oil-soluble ultraviolet absorbers are preferably used, and oil-soluble cinnamic acid derivatives, salicylic acid derivatives, triazine derivatives, benzylidene camphor derivatives, hydantoin derivatives, dibenzoylmethane derivatives, benzoic acid derivatives and phenyltriazine derivatives, as well as 2-cyano-3,3-diphenyl-2-propenoate 2-ethylhexyl (octocrylene), 1-(3,4-dimethoxyphenyl)-4,4-dimethyl-1,3-pentanedione, methylenebisbenzotriazolyltetramethylbutylphenol, and the like are more preferably used.Also, 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl 3-(4-methoxyphenyl)propenoate (cinoxate), 2-ethylhexyl salicylate, 4-tert-butyl-4'-methoxydibenzoylmethane, 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoic acid hexyl ester, 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate (octocrylene), 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2,4-bis-[ More preferably used are {4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate, 1-(3,4-dimethoxyphenyl)-4,4-dimethyl-1,3-pentanedione, 3-(4-methylbenzylidene)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one (methylbenzylidene camphor), methylenebisbenzotriazolyltetramethylbutylphenol, and the like. Examples of the ultraviolet scattering agent include inorganic powders or white pigments that have a high refractive index and physically reflect and scatter ultraviolet light on their surfaces, such as zinc oxide, titanium oxide, fine zinc oxide particles, and fine titanium oxide particles. The ultraviolet absorbers and ultraviolet scattering agents may be used alone or in combination of two or more. From the viewpoint of providing a protective effect against medium wavelength ultraviolet rays (UVB) and long wavelength ultraviolet rays (UVA), it is preferable to use a combination of one or more absorbents for medium wavelength ultraviolet rays (UVB) and one or more absorbents for long wavelength ultraviolet rays (UVA), or to use one or more absorbents for medium wavelength ultraviolet rays (UVB) and long wavelength ultraviolet rays (UVA). From the viewpoint of ultraviolet protection effect, it is preferable to use a combination of an ultraviolet absorber and an ultraviolet scattering agent. Commercially available products can be used as the ultraviolet absorber and ultraviolet scattering agent.The content of one or more selected from the group consisting of ultraviolet absorbers and ultraviolet scattering agents in the cosmetic can be appropriately set in consideration of the ultraviolet protection ability (e.g., SPF value) of the ultraviolet absorbers or ultraviolet scattering agents used, legal regulations, etc., but is preferably 0.1% by mass to 25% by mass, and more preferably 3% by mass to 25% by mass.

[0028] The present invention provides a method for improving SPF, which includes a step of adding the above-described composite powder of the present invention. That is, the above-described composite powder of the present invention can be used to improve SPF. The above-described features of the present invention can be applied to this method and use.

[0029] The present invention relates to use of a composition containing the above-mentioned (A) oil-soluble component having a melting point of 80°C or higher and (B) oil agent for surface treatment of the above-mentioned (C) powder. In this use, the above-mentioned characteristics of component (A), component (B), and component (C) can each be applied. This use allows the above-mentioned composite powder of the present invention to be produced. Furthermore, in this use, the characteristics of the above-mentioned method for producing the composite powder of the present invention can be applied as an embodiment of this use.

[0030] Another aspect of the present invention is a composite powder comprising (A) stearoyl glutamic acid or a salt thereof, and (C) a powder containing an oil gelling agent and / or a fatty acid metal salt, with the composition containing (A) present on the surface of the powder (C). Examples of salts of stearoyl glutamic acid in this aspect include pharmacologically acceptable salts, such as alkali metal salts such as lithium salts, sodium salts, and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; ammonium salts; and basic organic salts, triethanolamine salts, and the like. Among these, from the viewpoint of solubility, sodium salts, potassium salts, and ammonium salts are preferred, with sodium salts and potassium salts being more preferred, and sodium salts being even more preferred. Furthermore, both monosalts (e.g., monosodium glutamate) and disalts (e.g., disodium glutamate) can be used. Preferred salts of stearoyl glutamic acid include stearoyl glutamic acid, sodium stearoyl glutamate, disodium stearoyl glutamate, and potassium stearoyl glutamate. The characteristics of the oil gelling agent of the present invention described above can be applied to the oil gelling agent of this embodiment. Specifically, for example, the oil gelling agent of this embodiment may be N-2-ethylhexanoyl-L-glutamic acid dibutylamide or N-lauroyl-L-glutamic acid dibutylamide. The characteristics of the fatty acid metal salt of this embodiment can be applied to the characteristics of the fatty acid metal salt of the composite powder of the present invention described above. Specifically, for example, salts of divalent metals are preferred, such as zinc laurate, magnesium laurate, calcium laurate, zinc myristate, magnesium myristate, calcium myristate, zinc palmitate, magnesium palmitate, calcium palmitate, zinc stearate, magnesium stearate, and calcium stearate, with zinc palmitate, magnesium palmitate, calcium palmitate, zinc stearate, magnesium stearate, and calcium stearate being preferred. The characteristics of the powder (C) of this embodiment can be applied to the characteristics of the powder (C) of the composite powder of the present invention described above.The total content of stearoyl glutamic acid or a salt thereof and the oil gelling agent and / or fatty acid metal salt in the composite powder of this embodiment (content of component (A)) is 3% by mass or more, and may be preferably 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more. The content of component (A) in the composite powder of this embodiment may be 56% by mass or less, and preferably 45% by mass or less, or 40% by mass or less. The content of component (A) in the composite powder of this embodiment may be any of the above-mentioned compatible combinations, for example, 3 to 56 mass%, 5 to 56 mass%, 10 to 56 mass%, 15 to 56 mass%, 20 to 56 mass%, 3 to 45 mass%, 5 to 45 mass%, 10 to 45 mass%, 15 to 45 mass%, 20 to 45 mass%, 3 to 40 mass%, 5 to 40 mass%, 10 to 40 mass%, 15 to 40 mass%, and 20 to 40 mass%. Furthermore, when the oil absorption of the powder (C) is 100 ml / g or less, the content of component (A) in the composite powder of this embodiment may be preferably 40% by mass or less, more preferably 35% by mass or less, or may be 3 to 40% by mass, 5 to 40% by mass, 10 to 40% by mass, 15 to 40% by mass, 20 to 40% by mass, 3 to 35% by mass, 5 to 35% by mass, 10 to 35% by mass, 15 to 35% by mass, or 20 to 35% by mass. The oil absorption of the powder is measured by the refined linseed oil method (JIS K 5101-13-1:2004). By setting the content of component (A) in the composite powder of this embodiment within this range, the powder does not form lumps during production, and a composite powder with a good feel can be obtained. The content of stearoyl glutamic acid or a salt thereof in the composite powder of this embodiment is preferably 1.5% by mass or more, more preferably 3% by mass or more, even more preferably 5% by mass or more, and even more preferably 7% by mass or more. The content of stearoyl glutamic acid or a salt thereof is preferably 53% by mass or less, more preferably 50% by mass or less, even more preferably 40% by mass or less, even more preferably 30% by mass or less, and even more preferably 20% by mass or less.The content of stearoyl glutamic acid or a salt thereof may be any of the above-mentioned compatible combinations, for example, 1.5 to 53% by mass, 1.5 to 50% by mass, 1.5 to 40% by mass, 1.5 to 30% by mass, 1.5 to 20% by mass, 3 to 53% by mass, 3 to 50% by mass, 3 to 40% by mass, 3 to 30% by mass, 3 to 20% by mass, 5 to 53% by mass, 5 to 50% by mass, 5 to 40% by mass, 5 to 30% by mass, 5 to 20% by mass, 7 to 53% by mass, 7 to 50% by mass, 7 to 40% by mass, 7 to 30% by mass, or 7 to 20% by mass. The content of fatty acid metal salt in the composite powder of this embodiment is preferably 1.5% by mass or more, more preferably 3% by mass or more, even more preferably 5% by mass or more, and even more preferably 7% by mass or more. The content of the fatty acid metal salt is 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 fatty acid metal salt may be any of the above-mentioned compatible combinations, for example, 1.5 to 30% by mass, 1.5 to 25% by mass, 1.5 to 20% by mass, 3 to 30% by mass, 3 to 25% by mass, 3 to 20% by mass, 5 to 30% by mass, 5 to 25% by mass, 5 to 20% by mass, 7 to 30% by mass, 7 to 25% by mass, or 7 to 20% by mass. The content of the oil gelling agent in the composite powder of this embodiment is preferably 1.5% by mass or more, more preferably 3% by mass or more, even more preferably 5% by mass or more, and even more preferably 7% by mass or more. The proportion of the oil gelling agent in the (A) oil-soluble component is preferably 30% or less. The content ratio of the oil gelling agent in the oil-soluble component (A) is preferably 10% or more, more preferably 15% or more, and even more preferably 20% or more. The content ratio of the oil gelling agent in the oil-soluble component (A) may be any of the above-mentioned compatible combinations, for example, 10 to 30%, 15 to 30%, or 20 to 30%. The mass ratio of the content of stearoyl glutamic acid or a salt thereof to the content of the oil gelling agent or fatty acid metal salt in the composite powder of this embodiment is preferably 0.5 to 20, more preferably 1 to 10, and even more preferably 1.5 to 5.For the composite powder of this embodiment, any of the above-described features of the composite powder of the present invention that are not inconsistent with the features described above for the composite powder of the present invention may be applied to the composite powder of this embodiment.

[0031] The composite powder comprises, as the (A) oil-soluble component, stearoyl glutamic acid or a salt thereof and an oil gelling agent and / or a fatty acid metal salt (C) powder, and the composition comprising the (A) oil-soluble component is present on the surface of the (C) powder. The composite powder may be produced by the same production method as the composite powder of the present invention described above, or may be produced by a production method including a step of heat-mixing the (C) powder and stearoyl glutamic acid or a salt thereof at 110°C or higher, followed by adding a fatty acid metal salt and heat-mixing at 100°C or higher, or may be produced by a production method including a step of heat-mixing the (C) powder and a fatty acid metal salt at 100°C or higher, followed by adding stearoyl glutamic acid or a salt thereof and heat-mixing at 110°C or higher. A cooling step may be included between each heating step, and the cooling temperature in the cooling and mixing is preferably 80°C or lower, more preferably 70°C or lower, and even more preferably 60°C or lower.

[0032] The present invention also provides an emulsion composition containing the above-described composite powder of the present invention. The emulsion composition of the present invention may contain an SPF enhancer other than the composite powder of the present invention. The addition of the composite powder of the present invention to a control emulsion composition can improve its SPF value compared to a control emulsion composition to which the composite powder of the present invention is not added. The SPF improvement achieved by adding the composite powder of the present invention is preferably an SPF value improvement of 10% or more, more preferably an SPF value improvement of 15% or more, even more preferably an SPF value improvement of 20% or more, even more preferably an SPF value improvement of 50% or more, even more preferably an SPF value improvement of 70% or more, particularly preferably an SPF value improvement of 90% or more, and most preferably an SPF value improvement of 100% or more. Furthermore, the addition of an SPF enhancer other than the composite powder of the present invention to a control emulsion composition improves its SPF value compared to a control emulsion composition to which the SPF enhancer other than the composite powder of the present invention is not added. The SPF improver other than the composite powder of the present invention preferably improves the SPF value by 10% or more, more preferably 15% or more, even more preferably 20% or more, even more preferably 50% or more, still more preferably 100% or more, and particularly preferably 150% or more, relative to the control emulsion composition. A preferred embodiment of the SPF improver other than the composite powder of the present invention includes an embodiment (first embodiment) containing acyl lysine, an inorganic powder, and / or a biodegradable organic powder. The first embodiment of the SPF improver other than the composite powder of the present invention may be a composite powder surface-treated with acyl lysine, preferably containing an inorganic powder and / or a biodegradable organic powder. Another preferred embodiment of the SPF improver other than the composite powder of the present invention includes an embodiment (second embodiment) containing acyl lysine and / or a biodegradable organic powder. A second embodiment of the SPF enhancer other than a composite powder of the present invention may be a composite powder that preferably contains a biodegradable organic powder and is surface-treated with an acyl lysine.

[0033] Examples of inorganic powders used in the first aspect include yellow iron oxide, red iron oxide, black iron oxide, fine iron oxide particles, bismuth oxychloride, zirconium oxide, magnesium oxide, chromium oxide, cobalt oxide, carbon black, ultramarine, Prussian blue, zinc oxide, fine zinc oxide particles, titanium oxide, fine titanium oxide particles, silica, porous silica, alumina, cerium oxide, boron nitride, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate, magnesium silicate, silicon carbide, pigments, lake, sericite, mica, talc, kaolin, clay, bentonite, plate-shaped barium sulfate, butterfly-shaped barium sulfate, and hydroxyapatite. These may be used alone or in combination of two or more. The inorganic powder may further be a composite of the above (e.g., silica-coated titanium oxide, mica-coated titanium oxide, titanium-coated mica), or may be one of the above that has been surface-treated with silicone, a fluorine compound, a silane coupling agent, a silane, an organic titanate, a fatty acid, an acylamino acid (e.g., stearoyl glutamic acid), a metal soap (e.g., aluminum stearate), an oil, or an amino acid (e.g., silicone-treated talc, silicone-treated mica, silicone-treated sericite, silicone-treated titanium oxide, silicone-treated red iron oxide, silicone-treated yellow iron oxide, silicone-treated black iron oxide, stearoyl glutamic acid-treated titanium oxide, stearoyl glutamic acid-treated yellow iron oxide, stearoyl glutamic acid-treated red iron oxide, stearoyl glutamic acid-treated black iron oxide, and aluminum stearate-treated titanium oxide). The inorganic powder is preferably silica. As the silica, spherical or amorphous silica can be used, each of which may be porous, non-porous, hollow, or the like. Non-porous spherical silica and porous spherical silica are preferred, and porous spherical silica is more preferred. The average particle size of the silica is preferably 1 to 50 μm, more preferably 3 to 20 μm, and even more preferably 5 to 12 μm. Here, the average particle size of the silica is specified as per JIS standard (Z8819-2:2019).Silica is commercially available, and for example, porous silica beads SB-300 and SB-700 manufactured by Miyoshi Kasei Co., Ltd., and Sunsphere H-31, H-51, H-121, L-31, and L-51 manufactured by AGC Si-Tech Co., Ltd. can be used.

[0034] The biodegradable organic powder used in the first and second aspects is a powder of a biodegradable polymer that exhibits biodegradability in a biodegradation test. Examples of the biodegradability test method include ASTM D6400, ISO 17088, ISO-TG301F, and OCED 306. In the present invention, "biodegradable" means exhibiting biodegradability in at least one of these test methods. Examples of the biodegradable polymer include polylactic acid, polyhydroxybutyric acid (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), polyglycolic acid, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyethylene terephthalate succinate, and polybutylene adipate terephthalate. Biodegradable polymer powders are commercially available, and examples thereof include Ecosoft 608XF, Ecosoft 608, Biosoft 915, and Naturematte 31 manufactured by Micro Powders, and Techpolymer BIO EF-A manufactured by Sekisui Plastics Co., Ltd. The average particle size of the biodegradable polymer powder is preferably 50 μm or less, more preferably 1 to 35 μm, and even more preferably 2 to 20 μm. The average particle size of the biodegradable polymer powder is specified in accordance with JIS standard (Z8819-2:2019).

[0035] Examples of the biodegradable polymer include proteins, hydroxycarboxylic acid polyesters, polyhydroxyalkanoic acids, diolcarboxylic acid polyesters, and alginic acid. Examples of the protein include silk, wool, and feathers. Silk powder is preferred as the protein powder. The silk powder is not particularly limited, and silk powders obtained by known methods can be used. Silk powders are commercially available, and examples include silk powder manufactured by Izumi Senko Co., Ltd., N-Fibroin manufactured by Nagasuna Mayu Co., Ltd., and Silkgen G powder manufactured by Ichimaru Falcos Co., Ltd. The average particle size of the silk powder, expressed as a sphere-equivalent diameter, is preferably 50 μm or less, more preferably 1 to 35 μm, and even more preferably 2 to 20 μm. The sphere-equivalent diameter of the silk powder is specified in accordance with JIS standard (Z8819-2:2019). Examples of the hydroxycarboxylic acid polyester include polylactic acid, polyglycolic acid, polycaprolactone, and glycolic acid-caprolactone copolymer. Examples of the polyhydroxyalkanoic acid include polyhydroxybutyric acid (PHB), polyhydroxyvaleric acid, poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV), polyhydroxycaproic acid, polyhydroxycaprylic acid, PHBH composed of R-3-hydroxybutanoic acid (3HB) and R-3-hydroxyhexanoic acid (3HH), and modified polyvinyl alcohol. Examples of the diol carboxylic acid polyester include polyethylene succinate, polybutylene succinate, polyethylene terephthalate succinate, and polybutylene adipate terephthalate. Examples of the alginic acid include calcium alginate.

[0036] Examples of the biodegradable polymer include cellulose, starch, modified starch, cellulose derivatives, chitosan, and the like. Here, cellulose and starch are preferred, and cellulose may also be used. Examples of the cellulose include plate-shaped cellulose, spherical cellulose, and amorphous cellulose. Examples of plate-shaped cellulose include plate-shaped crystalline cellulose and needle-shaped crystalline cellulose, with plate-shaped crystalline cellulose being preferred. The average particle size of plate-shaped cellulose is preferably 2 to 50 μm, more preferably 5 to 30 μm, and even more preferably 8 to 20 μm. Here, the average particle size of plate-shaped cellulose is specified according to the JIS standard (Z8819-2:2019). Examples of spherical cellulose include spherical crystalline cellulose and amorphous cellulose. Examples of spherical cellulose include nonporous cellulose and porous cellulose, with nonporous cellulose being preferred. Here, spherical includes true sphere, nearly spherical, and elliptical. The average particle size of spherical cellulose is preferably 2 to 30 μm, more preferably 3 to 20 μm, and even more preferably 5 to 12 μm. Here, the average particle size of spherical cellulose is specified as per JIS standard (Z8819-2:2019). Cellulose registered under the INCI names of crystalline cellulose, cellulose acetate, and lignin can be used. Commercially available cellulose can be used, for example, TEGO Feel Green manufactured by Evonik, and CELLULOBEADS D-10 and CELLULOBEADS D-5 manufactured by Daito Kasei Kogyo Co., Ltd. Examples of the starch include starches derived from rice, corn, potato, tapioca, barley, etc., as well as pregelatinized starches and partially pregelatinized starches thereof. Starches derived from tapioca, barley, and rice are preferred. The shape of the starch may be spherical or irregular, with spherical being preferred. Here, spherical includes true spheres, nearly spherical, and ellipsoids. The average particle size of the starch is preferably 5 to 30 μm, more preferably 5 to 25 μm, and even more preferably 5 to 20 μm, as specified in the JIS standard (Z8819-2:2019).Starch is commercially available, and examples thereof include tapioca-derived starch such as Tapioca Natural 9096 manufactured by AGRANA, TAPIOCA PURE manufactured by Nouryon Japan, and A60012 ORGANIC TAPIOCA STARCH POWDER manufactured by Active Concepts, barley-derived starch such as Barley Natural manufactured by AGRANA, and rice-derived starch such as Fine Snow IR manufactured by Joetsu Starch and Resista Natural manufactured by AGRANA. Examples of modified starches include starch phosphate and alkylated starch, and examples of cellulose derivatives include cellulose acetate. Examples of chitosan include those derived from crab, shrimp, or krill. Crab-derived or shrimp-derived chitosan is preferred. The average particle size of chitosan is preferably 5 to 30 μm, more preferably 5 to 25 μm, and even more preferably 5 to 20 μm. Here, the average particle size of chitosan is specified as per the JIS standard (Z8819-2:2019). Chitosan is commercially available, for example, K45 manufactured by Izumi Senko Co., Ltd., which is chitosan derived from the shell of red snow crab.

[0037] In the first aspect, the blending amount of the inorganic powder in the SPF enhancer is preferably 10 to 90% by mass, more preferably 40 to 90% by mass. Also, in the first aspect, the blending amount of the biodegradable organic powder in the SPF enhancer is preferably 5 to 88% by mass, more preferably 5 to 40% by mass. In the first aspect, the inorganic powder is preferably silica, and the biodegradable organic powder is preferably cellulose.

[0038] In the second embodiment, the amount of biodegradable organic powder in the SPF enhancer is preferably 3 to 98% by mass, and more preferably 25 to 95% by mass.

[0039] The acyl lysine contained in the SPF improver other than the composite powder of the present invention preferably has a median diameter of 9 μm or less in the volume-based distribution, more preferably 6 μm or less from the viewpoint of improving adhesion, more preferably 5 μm or less from the viewpoint of further improving adhesion and improving feel, and even more preferably 4 μm or less from the viewpoint of improving adhesion and shortening production time. The median diameter of the number-based distribution of the acyl lysine is preferably 4 μm or less. The median diameter of the acyl lysine can be determined by measuring the number-based or volume-based particle size distribution using a laser diffraction / scattering particle size distribution analyzer. The median diameter refers to the particle size at the point where the distribution curve of the cumulative percentage of passing particles intersects the horizontal axis at 50%. The "number-based distribution" refers to a particle size distribution in which the number of particles is counted and the calculation is based on that number when calculating the frequency of each particle size in the particle size distribution, and the "volume-based distribution" refers to a particle size distribution in which the volume of particles assumed to be spherical is counted and the calculation is based on that value when calculating the frequency of each particle size in the particle size distribution. The bulk density of acyl lysine is preferably 0.38 g / mL or less. The bulk density is preferably 0.01 to 0.38 g / mL, more preferably 0.05 to 0.38 g / mL, and even more preferably 0.1 to 0.36 g / mL. The bulk density of acyl lysine can be measured by the following measurement method. The acyl lysine is stirred and crushed in a mixer for 2 minutes or more, and the bulk density of the obtained crystals is measured using a powder fluidity analyzer (for example, a powder rheometer FT-4 (manufactured by Freeman Technology™)). Specifically, a certain amount of acyl lysine is weighed into a holder, and then conditioned according to the usage procedure. The bulk density is measured from the volume after conditioning and the mass of the acyl lysine using the following formula: bulk density = mass after conditioning / volume after conditioning (g / mL). Acyl lysine can be produced by a method in which a basic solution of acyl lysine is dropped into a solution of hydrochloric acid or the like to cause crystallization, or by a pulverization method using a machine or the like. Acyl lysine having a volume-based distribution median diameter of 9 μm or less can be obtained, for example, by the method described in WO2020 / 262367.The acyl group of the acyl lysine preferably has 8 to 22 carbon atoms, more preferably a saturated or unsaturated fatty acyl group having 8 to 22 carbon atoms, such as octanoyl, lauroyl, myristoyl, palmitoyl, stearoyl, octyldodecyl, oleyl, behenyl, coconut oil fatty acyl, palm kernel oil fatty acyl, and beef tallow fatty acyl. However, in terms of general availability, it is preferably one or more selected from the group consisting of lauroyl and octanoyl. That is, the acyl lysine is preferably lauroyl lysine or octanoyl lysine, and more preferably lauroyl lysine. The blending amount of the acyl lysine in the SPF improver is preferably 2 to 50% by mass, more preferably 5 to 40% by mass.

[0040] The components constituting the composite powder of the present invention and the SPF enhancer other than the composite powder of the present invention may be present in the emulsion composition of the present invention. That is, the components constituting the composite powder of the present invention and the SPF enhancer other than the composite powder of the present invention may be blended separately into the emulsion composition, or all or part of the components constituting the composite powder of the present invention and the SPF enhancer other than the composite powder of the present invention may be pre-mixed and then blended into the emulsion composition. As a method for pre-mixing the components constituting the SPF enhancer to prepare an SPF enhancer other than the composite powder of the present invention, for example, the components constituting the SPF enhancer may be mixed in a mixer. The mixing may be dry mixing or wet mixing. Examples of the mixer that can be used include high-speed agitation mixers such as Henschel mixers, household mixers, and high-shear mixers; container rotation mixers or container rotation mixers with agitators such as W-type mixers, CV-type mixers, V-type mixers, and rocking mixers; mechanical agitation mixers such as ribbon agitators, double-shaft paddle mixers, double-shaft planetary agitators, and conical screw mixers; and compression / shear / impact mixers such as airflow agitation mixers, Julia mixers, Nauta mixers, and Nobilta mixers. From the viewpoints of low-cost production and versatility, high-speed agitation mixers are preferred.

[0041] The emulsion composition of the present invention preferably contains a UV absorber or a UV scattering agent. Examples of UV (ultraviolet) absorbers include UVA absorbers that absorb UVA (long-wavelength ultraviolet light around 320 to 400 nm) and UVB absorbers that absorb UVB (medium-wavelength ultraviolet light around 280 to 320 nm). Either can be used, but UVB absorbers are preferred. UV (ultraviolet) absorbers include oil-soluble and water-soluble types, and either can be used. Examples of the UV (ultraviolet) absorber include benzoic acid-based ultraviolet absorbers (e.g., diethylaminohydroxybenzoylhexyl benzoate, para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based ultraviolet absorbers (e.g., amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.); etc.); cinnamic acid-based ultraviolet absorbers (e.g., octyl methoxycinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate (2-ethylhexyl p-methoxycinnamate), 2-ethoxyethyl p-methoxycinnamate, cyclohexyl p-methoxycinnamate, ethyl α-cyano-β-phenylcinnamate, 2-ethylhexyl α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl di-para-methoxycinnamate, etc.);Benzophenone-based ultraviolet absorbers (e.g., 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy ... 4-(2-hydroxy-5'-t-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenylbenzotriazole; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, dimorpholinopyridazinone, and the like. In addition, examples of UV (ultraviolet) scattering agents include titanium oxide, zinc oxide, etc., and from the viewpoint of ultraviolet protection effect and transparency, fine particle titanium oxide having an average particle size of 0.1 μm or less, fine particle zinc oxide having an average particle size of 0.1 μm or less, etc. are preferably used, and fine particle titanium oxide is particularly preferably used.In addition, the shape of titanium oxide or zinc oxide may be any of plate-like, needle-like, spherical, etc., and may be coated with a hydrous oxide and / or oxide of at least one element selected from the group consisting of Al, Si, Zr, Ti, and Zn, or may be surface-treated with silicone treatment, silane treatment, metal soap treatment, fluorine-based treatment, amino acid-based treatment, organic titanate treatment, etc.;

[0042] The UV (ultraviolet) absorber and UV (ultraviolet) scattering agent may be used alone or in combination of two or more. Among the UV (ultraviolet) absorbers, a UVA absorber and a UVB absorber having different absorption wavelength ranges may be used in combination. Furthermore, a UV (ultraviolet) absorber and a UV (ultraviolet) scattering agent may be used in combination.

[0043] The emulsion composition of the present invention can be used as a cosmetic or topical skin preparation. The cosmetic or topical skin preparation can be prepared in any form suitable for application to the desired area (e.g., skin, hair, scalp, lips, eyes, eyelashes, eyelids, nails) according to conventional methods. Examples of cosmetic or topical skin preparations for the skin, lips, eyelashes, and nails include sunscreens such as sunscreens, body powders, and sprays; makeup cosmetics such as foundations, face powders, primers, BB creams, body colors, bronzers, face powders, loose powders, nail polish, cheek colors, makeup bases, and concealers; lip cosmetics such as lip colors, lip liners, and lipsticks; eye makeup cosmetics such as eyeliners, eye shadows, eyebrow products, and mascaras; leave-on cosmetics such as emulsions, lotions, creams, gels, and serums; and face masks. Examples of cosmetic or topical hair preparations include hair styling agents, hair emulsions, hair treatments, hair conditioners, and hair lotions. Cosmetics or topical preparations for the scalp include, for example, hair growth agents. Preferred cosmetics include, for example, makeup cosmetics, eye makeup cosmetics, lip cosmetics, and leave-on cosmetics. Preferred topical preparations include, for example, ointments, creams, mousses, and gels. A particularly preferred use of the present invention is makeup cosmetics.

[0044] When used as a cosmetic or topical skin preparation, the cosmetic may contain ingredients that are normally used in cosmetics (including topical pharmaceuticals and quasi-drugs) to the extent that the effects of the present invention are not impaired. For example, oils, inorganic powders, water, surfactants, amino acids, amino acid derivatives, lower alcohols (e.g., ethanol), polyhydric alcohols (e.g., glycerin, butylene glycol), sugar alcohols and alkylene oxide adducts thereof, water-soluble polymers (e.g., hydroxyethyl cellulose), film-forming polymers, gelling agents (e.g., dibutyl lauroyl glutamide, dibutyl ethyl hexanoyl glutamide), moisturizing agents (e.g., sodium pyrrolidone carboxylate), bactericides and antibacterial agents, anti-inflammatory agents, analgesics, antifungal agents, keratin softening and peeling agents, skin colorants, hormones, ultraviolet absorbers, hair growth agents, and perspiration agents. Examples of the active ingredients include antiperspirants and astringent active ingredients (e.g., zinc salt of pyrrolidone carboxylic acid), sweat deodorants, vitamins, blood flow promoters (vasodilators, blood circulation promoters), herbal medicines, plant extracts, pH adjusters, chelating agents (e.g., EDTA-2Na), viscosity modifiers, pearlizing agents, natural fragrances, synthetic fragrances, dyes and pigments (e.g., Red No. 202, Blue No. 1), antioxidants (e.g., tocopherol, tocopherol acetate, pentagalloyl glucoside), preservatives (e.g., methylparaben, butylparaben, propylparaben, phenoxyethanol), emulsifiers, thickeners, fats and waxes, silicone compounds, perfume oils, etc.

[0045] Examples of oils include higher alcohols such as octyldodecanol and oleyl alcohol; hydrocarbon oils such as squalane, liquid paraffin, hydrogenated polyisobutene and isododecane; jojoba seed oil, isononyl isononanoate, isostearyl neopentanoate, cetyl 2-ethylhexanoate, ethylhexyl palmitate, alkyl benzoate, polyglyceryl-2 tetraisostearate, lauroyl glutamate (phytosteryl / octyldodecyl), lauroyl sarcosine isopropyl, ethylhexyl methoxycinnamate, myristoyl methyl beta-alanine (phytosteryl / decyltetradecyl), caprylic / capric acid glutamate, and the like. Examples of suitable oils include natural or synthetic ester oils such as glyceryl ester, diglycerides, natural or synthetic triglycerides such as corn oil, olive oil, sunflower oil, caprylic / capric triglyceride, and triethylhexanoin, highly viscous oils such as phytosteryl / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate, diisostearyl malate, hydrogenated polydecene, polyglyceryl-2 triisostearate, polyglyceryl-2 diisostearate, and pentaerythrityl tetraisostearate, silicone oils such as dimethicone, methicone, cyclopentasiloxane, cyclohexasiloxane, phenyl trimethicone, and PEG-10 dimethicone, fluorine-based oils such as perfluoropolyether, perfluorodecalin, and perfluorooctane, and mineral oil. These may be used alone or in combination of two or more.

[0046] Examples of inorganic powders include yellow iron oxide, red iron oxide, black iron oxide, fine iron oxide particles, bismuth oxychloride, zirconium oxide, magnesium oxide, chromium oxide, cobalt oxide, carbon black, ultramarine, Prussian blue, zinc oxide, fine zinc oxide particles, titanium oxide, fine titanium oxide particles, silica, porous silica, alumina, cerium oxide, boron nitride, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate, magnesium silicate, silicon carbide, pigments, lake, sericite, mica, talc, kaolin, clay, bentonite, plate-shaped barium sulfate, butterfly-shaped barium sulfate, hydroxyapatite, etc. These may be used alone or in combination of two or more. The inorganic powder may further be a composite of the above-mentioned inorganic powders (for example, silica-coated titanium oxide, mica-coated titanium oxide, titanium-coated mica), or may be one of the above-mentioned inorganic powders that has been surface-treated with a silicone treatment, a fluorine compound treatment, a silane coupling agent treatment, a silane treatment, an organic titanate treatment, a fatty acid treatment (for example, stearoyl glutamic acid treatment), a metal soap treatment (for example, aluminum stearate treatment), an oil treatment, an amino acid treatment, or the like (for example, silicone-treated talc, silicone-treated mica, silicone-treated sericite, silicone-treated titanium oxide, silicone-treated red iron oxide, silicone-treated yellow iron oxide, silicone-treated black iron oxide, stearoyl glutamic acid-treated titanium oxide, stearoyl glutamic acid-treated yellow iron oxide, stearoyl glutamic acid-treated red iron oxide, stearoyl glutamic acid-treated black iron oxide, and aluminum stearate-treated titanium oxide).

[0047] The surfactant is not particularly limited, and anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants can be used, but nonionic surfactants are preferred from the viewpoint of emulsion stability, etc. These can be used alone or in combination of two or more. As the nonionic surfactant, any nonionic surfactant commonly used in the production of general cosmetics can be used without any particular limitation. Specific examples include polyoxyethylene (hereinafter also referred to as POE).) (5-10 mol) hexadecyl ether, POE (6-9 mol) oleyl ether, POE (5-7 mol) lauryl ether, POE (5-10 mol) isostearyl ether, POE (8-12 mol) dilaurate, POE (6-12 mol) monoisostearate, POE (8-20 mol) diisostearate, POE (5-12 mol) monooleate, POE (3-60 mol) glyceryl monostearate, POE (3-20 mol) glyceryl tristearate, POE (3-60 mol) glyceryl Ceryl monoisostearate, POE (10-60 mol) glyceryl diisostearate, POE (3-60 mol) glyceryl triisostearate, POE (20-50 mol) glyceryl trioleate, POE (4-25 mol) sorbitan monolaurate, POE (5-25 mol) sorbitan monococoate, POE (5-25 mol) sorbitan monopalmitate, POE (5-25 mol) sorbitan monostearate, POE (5-25 mol) sorbitan monooleate, POE (5-25 mol) POE (5 to 25 mol) sorbitan tristearate, POE (5 to 25 mol) sorbitan trioleate, POE (20 to 40 mol) trimethylolpropane trimyristate, POE (20 to 50 mol) trimethylolpropane triisostearate, POE (5 to 100 mol) hydrogenated castor oil, POE (15 to 50 mol) castor oil, POE (10 to 60 mol) hydrogenated castor oil monolaurate, POE (5 to 60 mol) hydrogenated castor oil monoisostearate, POE (3 to 60 mol) hydrogenated castor oil triisostearate, Examples thereof include glyceryl monoisostearate, glyceryl diisostearate, diglyceryl monoisostearate, diglyceryl monooleate, sorbitan monoisostearate, sorbitan hexisostearate, sorbitan monooleate, tetraglyceryl monoisostearate, hexaglyceryl monoisostearate, decaglyceryl monoisostearate, hexaglyceryl diisostearate, decaglyceryl diisostearate, decaglyceryl pentaisostearate, etc. These may be used alone or in combination of two or more.

[0048] Next, the present invention will be described with reference to examples and comparative examples, but the present invention is not limited to these.

[0049] (Method for Preparing Composite Powders) (Examples) A ​​stirrer was placed in a 50 mL vial, and (A) an oil-soluble component with a melting point of 80°C or higher and (B) an oil agent (Tables 1 to 6) were weighed out and dissolved in an oil bath at 130°C to prepare an oil gelling agent solution. Next, a specified amount of (C) powder (Tables 1 to 6) was weighed out and added to the oil gelling agent solution. Stirring was continued with a spatula at 130°C for approximately 5 minutes. After removing from the oil bath, stirring with a spatula continued until the temperature dropped to 40°C or below to obtain a composite powder. (Comparative Examples and Reference Examples) Composite powders were obtained in the same manner as in the Examples, except that (A) an oil-soluble component with a melting point of 80°C or higher or (B) an oil agent was not included, or the components listed in Tables 1 to 6 were used instead. Using the obtained composite powders of the above Examples, Comparative Examples, and Reference Examples, sensory evaluation, water repellency, and hot water resistance were evaluated using the following methods. The results are shown in Tables 1 to 6.

[0050] (Sensory Evaluation) Six expert panelists were interviewed regarding the evaluation items of smoothness, softness, and uniform adhesion to the skin, and when the control (spherical silicone powder KSP-100 Shin-Etsu Silicones) was given a score of ◯, the Examples and Comparative Examples were given scores for each evaluation item as follows: ⊚: better than silicone powder, ◯: equivalent to or similar to silicone powder, and ×: significantly inferior to silicone powder, and the evaluation result of the largest number of evaluators among the six evaluators was adopted. In the event of a tie, the lower score was adopted as the judgement value for each sensory evaluation result. The evaluation results are shown in Tables 1 to 6.

[0051] (Water repellency) 5 g of water was placed in a 10 mL glass vial, and 30 mg of the obtained composite powder was gradually poured in from above. When added to the water surface, the composite powder was visually confirmed to remain on the water surface for 60 minutes or more to evaluate water repellency. When no composite powder sank at all, it was evaluated as ⊚, when only a few pieces (1 to 2 pieces) sank, it was evaluated as ◯, and when more pieces sank, it was evaluated as ×.

[0052] (Hot Water Resistance) 100 g of MilliQ water was weighed into a beaker and heated in a water bath set to 90°C (product temperature: 80°C). 100 mg of the obtained composite powder was added to the beaker. The mixture was then mixed in a homomixer at 1500 rpm for 15 minutes. The floating powder was collected with a spatula and dried at 50°C for 10 minutes. The powder was then observed under SEM. The cases where the particles were aggregated or dissolved were marked with "x", and the cases where there was no aggregation or dissolution were marked with "o".

[0053]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059] (Formulation Example 1) A lip cosmetic was prepared as a cosmetic or external skin preparation using the composite powder of the present invention using the components shown in Table 7 as follows. Component A was heated and dissolved at 105±5°C, and component B was added to component A and heated and dissolved at 90°C. Component C was then added and heated and mixed at 90°C, after which the paste was dispersed three times using a triple roll mill, and then component D was added. Component E was then added and heated and mixed at 90°C for 15 minutes, after which the mixture was degassed. The mixture was filled into a mold at a filling temperature of 90°C, cooled, and then loaded into a container. The lip cosmetic of Formulation Example 1 had little color unevenness and good color uniformity. Furthermore, it did not cause sweating and had good stability.

[0060]

[0061] (Formulation Example 2) A leave-on cosmetic preparation as a cosmetic or topical skin preparation using the composite powder of the present invention was prepared using the components shown in Table 8 as follows. Component A and component B were each heated to 80°C to dissolve, and then component A was added to component B while stirring. The mixture was emulsified using a homomixer (3000 rpm, 3 minutes, 80°C) and cooled to room temperature to obtain a leave-on cosmetic preparation. The leave-on cosmetic preparation of Formulation Example 2 provided an excellent moist feeling after application and provided a good gloss upon application. Furthermore, it had good stability and antiseptic properties.

[0062]

[0063] Formulation Example 3: Composite Powder A loose powder for use as a cosmetic or topical skin preparation using the powder composition of the present invention was prepared using the components shown in Table 9 as follows. Component A was finely pulverized for 2 minutes using a fine pulverizer (IKA Corporation, pulverizer M20 general-purpose mill). Component B was added to Component A and stirred and mixed (Mill & Mixer TML20B, 30 seconds x 2 times). The mixture of Component C was added and stirred and mixed (Mill & Mixer TML20B, 30 seconds x 2 times). The mixture of Component D was then added and stirred and mixed (Mill & Mixer TML20B, 30 seconds x 2 times) to obtain a loose powder. The loose powder of Formulation Example 3 exhibited excellent slipperiness, adhesion, and uniformity during application, and also provided a moist feeling and soft focus effect after application.

[0064]

[0065] Formulation Example 4 An eye makeup cosmetic was prepared as a cosmetic or topical skin preparation using the composite powder of the present invention using the components shown in Table 10 as follows. After mixing component A for 10 minutes (FM 10C / I, manufactured by Nippon Coke and Engineering Co., Ltd.), component B was added to component A and mixed for an additional 20 minutes. After mixing component C for 10 minutes using a mixer (FM 10C / I, manufactured by Nippon Coke and Engineering Co., Ltd.), it was added to the mixture of components A and B and mixed for an additional 5 minutes. The resulting mixture was filled into a container and compressed using a press to obtain the desired eye makeup cosmetic. The eye makeup cosmetic of Formulation Example 4 had good pearly finish, luster, adhesion, and color development after application.

[0066]

[0067] Formulation Example 5 A sunscreen emulsion as a cosmetic or topical skin preparation using the composite powder of the present invention was prepared using the ingredients shown in Table 11 as follows. Phase B, in which xanthan gum had been dispersed, was added to Phase A. Phases A and B were mixed until the xanthan gum swelled. Phase C was added to the mixture of Phases A and B and mixed until uniform. In a separate container, Phase D was mixed until the solids were completely dissolved. Phase D was added to the mixture of Phases A, B, and C and mixed until uniform. Phase E was then added and mixed until uniform. Phase F was then added and mixed until uniform. The sunscreen emulsion of Formulation Example 5 felt smooth and easy to spread upon application, and was not sticky after application. It was also confirmed that the SPF was improved.

[0068]

[0069] Formulation Example 6 A sunscreen formulation was prepared using the components shown in Table 12 as follows. Component B was added to component A and mixed in a homomixer (3000 rpm). Component C was then added and mixed in a homomixer (3000 rpm). Component D was then gradually added to the mixed mixture and emulsified in a homomixer (3000 rpm) to obtain a sunscreen. The SPF and UVAPF values ​​of the resulting sunscreen were measured as described below. The results are shown in Table 18. The sunscreen containing the composite powder of the present invention had improved SPF and UVAPF values ​​compared to the uncompounded sunscreen, demonstrating an SPF-boosting effect and a UVAPF-boosting effect.

[0070]

[0071] Formulation Example 7 A sunscreen formulation was prepared using the components shown in Table 13 as follows. Component B was added to component A and mixed in a homomixer (3000 rpm). Component C was then added and mixed in a homomixer (3000 rpm). Component D was then gradually added to the mixed mixture and emulsified in a homomixer (3000 rpm) to obtain a sunscreen. The SPF and UVAPF values ​​of the resulting sunscreen were measured as described below. The results are shown in Table 18. The sunscreen containing the composite powder of the present invention had improved SPF and UVAPF values ​​compared to the uncompounded sunscreen, demonstrating an SPF-boosting effect and a UVAPF-boosting effect.

[0072]

[0073] Formulation Example 8 A liquid foundation formulation was prepared using the components shown in Table 14 as follows. Component A was heated (75°C) and mixed (4000 rpm) in a homomixer. Component B was added to component A, and the mixture was heated (75°C) and mixed (4000 rpm) in a homomixer. Component C was then added, and the mixture was heated (75°C) and mixed (4000 rpm) in a homomixer. Component D, which had been heated to 75°C and mixed, was gradually added and emulsified (75°C, 4000 rpm). The mixture was then cooled to room temperature while stirring in a paddle mixer to obtain a liquid foundation. The SPF and UVAPF values ​​of the resulting liquid foundation were measured as described below. The results are shown in Table 18. The liquid foundation containing the composite powder of the present invention had improved SPF and UVAPF values ​​compared to the uncompounded liquid foundation, demonstrating SPF and UVAPF boosting effects.

[0074]

[0075] Formulation Example 9 A liquid foundation formulation was prepared using the components shown in Table 15 as follows. Component A was heated (75°C) and mixed (4000 rpm) in a homomixer. Component B was added to component A, and the mixture was heated (75°C) and mixed (4000 rpm) in a homomixer. Component C was then added, and the mixture was heated (75°C) and mixed (4000 rpm) in a homomixer. Component D, which had been heated to 75°C and mixed, was gradually added and emulsified (75°C, 4000 rpm). The mixture was then cooled to room temperature while stirring in a paddle mixer to obtain a liquid foundation. The SPF and UVAPF values ​​of the resulting liquid foundation were measured as described below. The results are shown in Table 18. The liquid foundation containing the composite powder of the present invention had improved SPF and UVAPF values ​​compared to the uncompounded liquid foundation, demonstrating SPF and UVAPF boosting effects.

[0076]

[0077] Formulation Example 10 A liquid foundation formulation was prepared using the components shown in Table 16 as follows. Component A was heated (75°C) and mixed (4000 rpm) in a homomixer. Component B was added to component A, and the mixture was heated (75°C) and mixed (4000 rpm) in a homomixer. Component C was then added, and the mixture was heated (75°C) and mixed (4000 rpm) in a homomixer. Component D, which had been heated to 75°C and mixed, was gradually added and emulsified (75°C, 4000 rpm). The mixture was then cooled to room temperature while stirring in a paddle mixer to obtain a liquid foundation. The SPF and UVAPF values ​​of the resulting liquid foundation were measured as described below. The results are shown in Table 18. The liquid foundation containing the composite powder of the present invention had improved SPF and UVAPF values ​​compared to the uncompounded liquid foundation, demonstrating SPF and UVAPF boosting effects.

[0078]

[0079] Comparative Powder Examples 1 to 4 Each raw material was placed in a Unipack E-4 (Seisan Nippon Co., Ltd.) according to Table 17, and mixed at room temperature to a uniform consistency to prepare comparative powders.

[0080]

[0081] Measurement of UV Protection Effect (Sun Protection Factor: SPF) The SPF value was tested in accordance with ISO 24444 (2019). The SPF value was measured (n=10) by uniformly applying 32 mg of each formulation example to a PMMA plate (HELIOPLATE HD6 (50 mm x 50 mm)) using an SPF analyzer (UV-2000S SPF analyzer manufactured by Labsphere).

[0082] Measurement of UVAPF (Ultraviolet A Protection Factor) Value The UVAPF value was measured in accordance with ISO 24443 (2021). The UVAPF value was measured (n = 10) by uniformly applying 32 mg of each formulation example to a PMMA plate (HELIOPLATE HD6 (50 mm x 50 mm)) using an SPF analyzer (UV-2000S SPF analyzer manufactured by Labsphere).

[0083]

Claims

1. A composite powder comprising: (A) an oil-soluble component having a melting point of 80°C or higher; (B) an oil agent; and (C) a powder having an average particle size of 0.01 μm to 50 μm in a volumetric distribution; wherein a composition containing the oil-soluble component (A) and the oil agent (B) is present on the surface of the powder (C); the content of (A) is 3% by mass or more; and the sum of the contents of (A) and (B) is 56% by mass or less.

2. The composite powder according to claim 1, wherein (A) the oil-soluble component and (B) the oil agent are present in a mixed state on the surface of (C) the powder.

3. A composite powder according to claim 1 or 2, wherein the oil-soluble component (A) is one or more selected from the group consisting of an oil gelling agent, an acylamino acid or a salt thereof, and a fatty acid metal salt.

4. The composite powder according to claim 3, wherein the oil-soluble component (A) contains an amino acid-based oil gelling agent as the oil gelling agent.

5. The composite powder according to claim 4, wherein the amino acid oil gelling agent is one or more selected from the group consisting of N-octanoyl-L-glutamic acid dibutylamide, N-2-ethylhexanoyl-L-glutamic acid dibutylamide, N-decanoyl-L-glutamic acid dibutylamide, and N-lauroyl-L-glutamic acid dibutylamide.

6. The composite powder according to claim 4, wherein the amino acid oil gelling agent is at least one selected from the group consisting of N-2-ethylhexanoyl-L-glutamic acid dibutylamide and N-lauroyl-L-glutamic acid dibutylamide.

7. The composite powder according to claim 3, wherein the oil-soluble component (A) contains, as the acylamino acid, an N-acylamino acid having an acyl group with a carbon chain length of C12 to C22.

8. The complex powder according to claim 3, wherein the oil-soluble component (A) contains, as an acyl amino acid, one or more selected from the group consisting of N-lauroyl glutamic acid, N-myristoyl glutamic acid, N-palmitoyl glutamic acid, N-stearoyl glutamic acid, N-behenoyl glutamic acid, N-palmitoleyl glutamic acid, N-oleoyl glutamic acid, and N-linoleoyl glutamic acid.

9. The composite powder according to claim 3, wherein the oil-soluble component (A) contains, as the fatty acid metal salt, a metal salt of a fatty acid having a carbon chain length of C8 to C22.

10. A composite powder according to claim 3, wherein (A) the oil-soluble component contains a divalent metal salt as a fatty acid metal salt.

11. A composite powder according to any one of claims 1 to 10, wherein the oil (B) comprises one or more selected from the group consisting of aliphatic alcohols, fatty acids, aliphatic esters, and waxes.

12. A composite powder according to any one of claims 1 to 11, wherein (B) the oil agent comprises one or more selected from aliphatic alcohols having a carbon chain length of C18 to C22 and fatty acids having a carbon chain length of C18 to C22.

13. A composite powder according to any one of claims 1 to 12, wherein the content of (B) oil agent is 2 mass% or more.

14. A composite powder according to any one of claims 1 to 13, wherein the powder (C) is an organic powder and / or an inorganic powder.

15. A composite powder according to any one of claims 1 to 14, wherein the powder (C) is one or more selected from the group consisting of metal oxides, silica, starch, cellulose, and crystalline cellulose.

16. A composite powder according to any one of claims 1 to 15, wherein (C) the oil absorption of the powder is 10 ml / g or more.

17. A composite powder according to any one of claims 1 to 16, wherein (C) the powder contains silica.

18. A composite powder according to any one of claims 1 to 17, wherein (C) the powder contains porous silica.

19. A composite powder according to any one of claims 1 to 18, wherein (C) the powder contains spherical silica.

20. A composite powder according to any one of claims 1 to 19, in which (A) the oil-soluble component and (B) the oil agent are in a mixed state and cover 80% or more of the surface of (C) the powder.

21. The composite powder according to any one of claims 1 to 20, wherein when 5 g of water is placed in a 10 mL glass vial and 30 mg of the composite powder is gradually poured from above onto the surface of the water, the composite powder floats on the water surface for 30 minutes or more.

22. A cosmetic containing the composite powder according to any one of claims 1 to 21.

23. An emulsion composition containing the composite powder according to any one of claims 1 to 21 and optionally containing an SPF improver.

24. The emulsion composition according to claim 23, further comprising a UV absorber or a UV scattering agent.

25. An emulsion composition according to claim 23 or 24, which has an SPF value improved by 10% or more compared to a control emulsion composition which is the same as said emulsion composition except that it does not contain said complex powder.

26. A method for producing a composite powder comprising: (A) an oil-soluble component having a melting point of 80°C or higher; (B) an oil; and (C) a powder having an average particle size of 0.01 μm to 50 μm in volumetric distribution; the method comprising: (i) a step of heating and mixing the (A) oil-soluble component and the (B) oil at 80°C or higher; and a step of heating and mixing the (A) oil-soluble component, the (B) oil, and the (C) powder at 80°C or higher; or (ii) a step of heating and mixing the (A) oil-soluble component, the (B) oil, and the (C) powder at 80°C or higher.

27. A method for producing a composite powder comprising (A) an oil-soluble component having a melting point of 80°C or higher, (B) an oil agent, and (C) a powder having an average particle size of 0.01 μm to 50 μm in volumetric distribution, the method comprising the steps of treating the surface of (C) the powder with (A) the oil-soluble component and treating the surface of (C) the powder with (B) the oil agent, and both of the surface treatment steps include a heating and mixing step.

28. The manufacturing method described in claim 27, in which (A) the oil-soluble component and (C) the powder are heated and mixed at 80°C or higher.

29. A manufacturing method described in claim 27 or 28, in which (B) the oil and (C) the powder are heated and mixed at 80°C or higher.

30. A manufacturing method according to any one of claims 27 to 29, comprising simultaneously carrying out a step of treating the surface of (C) powder with (A) an oil-soluble component and a step of treating the surface of (C) powder with (B) an oil agent.

31. The method of any one of claims 26 to 30, further comprising a step of cooling and mixing.

32. The method of claim 31, wherein the cooling temperature is 80°C or less.

33. A method for producing a cosmetic, comprising the step of incorporating the composite powder according to any one of claims 1 to 21 into the cosmetic.

34. The method of manufacturing according to claim 33, further comprising the step of incorporating an SPF enhancer into the cosmetic.

35. The manufacturing method according to claim 33 or 34, wherein the cosmetic is an emulsion composition.

36. A method for improving the SPF of a composition, comprising the step of adding to the composition a composite powder according to any one of claims 1 to 21.

37. The method of claim 36, wherein the composition is a cosmetic, preferably an emulsion composition.

38. Use of a composite powder according to any one of claims 1 to 21 for improving SPF.

39. Use according to claim 38, comprising the step of adding a composite powder according to any one of claims 1 to 21 to a composition.

40. Use according to claim 39, wherein the composition is a cosmetic, preferably an emulsified composition.

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