Powder material for cosmetic, method for producing same, and cosmetic

Abstract

This powder material for a cosmetic contains a powder for a cosmetic that has been surface-treated with a surface treatment agent. The surface treatment agent contains: component (a), a mannosyl erythritol lipid represented by formula (1); and component (b), an ester compound of glycerin and a fatty acid having 8-20 carbon atoms. The content of component (a) is 0.5-3 mass%. The content of component (b) is 0.1-10 mass%.

Description

Powder material for cosmetics, its manufacturing method, and cosmetics

[0001] The present invention relates to a powder material for cosmetics containing a cosmetic powder that has been surface-treated with a surface treatment agent, a method for producing the powder material for cosmetics, and cosmetics containing the powder material for cosmetics.

[0002] Cosmetics contain a variety of cosmetic powders, such as inorganic powders and organic powders, and cosmetic powder materials have been proposed in which the surfaces of these cosmetic powders have been surface-treated (coated) with various surface treatment agents depending on the purpose of the blending.

[0003] For example, a powder material for cosmetics coated with an ester compound of glycerin and a fatty acid having 8 to 20 carbon atoms has been proposed (see Patent Document 1). This powder material for cosmetics is said to be endowed with high water resistance and to exhibit good dispersibility in any of hydrocarbon-based oils, ester-based oils, and silicone-based oils.

[0004] Meanwhile, for example, in order to improve the feel of the pigment, cosmetic powder materials have been proposed in which the surface of hydrophobic powders such as cosmetic pigments is coated with a surface treatment agent containing mannosylerythritol lipid, a glycolipid produced by yeast and made from olive oil or the like (see Patent Documents 2 and 3). Water-in-oil foundations containing these cosmetic powder materials are said to have excellent skin barrier function and moisture retention properties, and to impart freshness and moisture to the skin.

[0005] International Publication No. 2022 / 030462 International Publication No. 2011 / 040357 Japanese Patent Application Laid-Open No. 2017-81907

[0006] However, the cosmetic powder material of Patent Document 1, in which the cosmetic powder is surface-treated with an ester compound of glycerin and a fatty acid having 8 to 20 carbon atoms, may be inferior in water resistance and oil dispersibility.Furthermore, the cosmetic powder materials of Patent Documents 2 and 3, in which the cosmetic powder is surface-treated with mannosylerythritol lipid, may be inferior in emulsion stability.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a powder material for cosmetics that has excellent water resistance, dispersibility in oils, and emulsion stability, a method for producing said powder material for cosmetics, and cosmetics containing said powder material for cosmetics.

[0008] A characteristic feature of the powder material for cosmetics according to the present invention for solving the above-mentioned problems is that the powder material for cosmetics includes a cosmetic powder that has been surface-treated with a surface treatment agent, wherein the surface treatment agent contains: component (a): a mannosylerythritol lipid represented by the following formula (1); and component (b): an ester compound of glycerin and a fatty acid having 8 to 20 carbon atoms, and the content of component (a) is 0.5 to 3 mass %, and the content of component (b) is 0.1 to 10 mass %.

[0009] (In the formula (1), R １ and R ２ each independently represents an aliphatic acyl group having 6 to 20 carbon atoms; R ３ and R ４ each independently represents a hydrogen atom or an acetyl group, and n represents an integer of 2 to 4.

[0010] According to the cosmetic powder material of this configuration, the cosmetic powder is surface-treated with a surface treatment agent containing component (a) and component (b) so that the contents of component (a) and component (b) fall within the above-mentioned appropriate range, resulting in excellent water resistance, dispersibility in oils, and emulsion stability. Furthermore, by setting the contents of component (a) and component (b) within the above-mentioned appropriate range, component (a) and component (b) coat the surface of the cosmetic powder, allowing the cosmetic powder material as a whole to have the properties of a powder. As a result, the resulting cosmetic powder can have even greater water resistance, dispersibility in oils, and emulsion stability. Furthermore, a refreshing feel can be obtained when used.

[0011] In the powder material for cosmetics according to the present invention, it is preferable that the component (b) is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, tri(caprylic / capric)glyceryl, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate.

[0012] According to the powder material for cosmetics having the above-described configuration, by selecting an appropriate compound as component (b), it is possible to further improve water resistance, dispersibility in oils, and emulsion stability.

[0013] In the powder material for cosmetics according to the present invention, １ and R ２ are preferably each independently an aliphatic acyl group having 10 to 14 carbon atoms.

[0014] According to the powder material for cosmetics of this configuration, R １ and R ２ By selecting an appropriate aliphatic acyl group as above, the hydrophobicity can be appropriately increased, and therefore the water resistance, dispersibility in oils, and emulsion stability of the powder material for cosmetics can be further improved.

[0015] In the cosmetic powder material according to the present invention, it is preferable that the cosmetic powder is at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, talc, zinc oxide, silicon oxide, pearl mica, mica, and sericite.

[0016] According to the cosmetic powder material of this configuration, by selecting the above-mentioned appropriate powder as the cosmetic powder, it is possible to further improve water resistance, dispersibility in oils, and emulsion stability.

[0017] Another characteristic feature of the method for producing a powder material for cosmetics according to the present invention for solving the above-mentioned problems is that it comprises a mixing step of mixing a cosmetic powder with a mixed liquid obtained by dispersing, suspending or dissolving, in a solvent, component (a): mannosylerythritol lipid represented by the following formula (1), and component (b): an ester compound of glycerin and a fatty acid having 8 to 20 carbon atoms; and a heat treatment step of heat treating the mixture obtained in the mixing step.

[0018] (In the formula (1), R １ and R ２ each independently represents an aliphatic acyl group having 6 to 20 carbon atoms; R ３ and R ４ each independently represents a hydrogen atom or an acetyl group, and n represents an integer of 2 to 4.

[0019] According to the manufacturing method of the powder material for cosmetics of this configuration, by carrying out the above-mentioned mixing process and the above-mentioned heat treatment process, it is possible to obtain a powder material for cosmetics that has excellent water resistance, dispersibility in oils, and emulsion stability.

[0020] In the method for producing a powder material for cosmetics according to the present invention, it is preferable that in the mixing step, the blending ratio of the solvent to the component (a) contained in the mixed liquid is adjusted to be 10:1 or more in mass ratio.

[0021] According to the manufacturing method of the powder material for cosmetics of this configuration, the dispersibility of component (a) in the solvent can be improved by adjusting the blending ratio of the solvent and component (a) contained in the mixed liquid to the appropriate range described above.

[0022] In the method for producing a powder material for cosmetics according to the present invention, it is preferable that the mixture is heat-treated at 70 to 150°C in the heat-treating step.

[0023] According to the method for producing a cosmetic powder material of this configuration, by heat-treating the mixture at the appropriate temperature, the hydrophilic groups of the component (b), an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin, are oriented toward the cosmetic powder on the surface of the cosmetic powder, thereby producing a cosmetic powder material with excellent water resistance. Also, the components (a) and (b) can be satisfactorily fixed to the cosmetic powder.

[0024] In the method for producing a powder material for cosmetics according to the present invention, the solvent is preferably an organic solvent and / or water.

[0025] According to the manufacturing method of the powder material for cosmetics of this configuration, by using an organic solvent and / or water as the solvent, no impurities remain in the powder material for cosmetics after the heat treatment process, and a highly pure product can be obtained.

[0026] Another feature of the cosmetic according to the present invention for solving the above problem is that the above powder material for cosmetics is blended therein.

[0027] The cosmetic of this configuration, which contains the above-mentioned powder material for cosmetics, has excellent water resistance, dispersibility in oils, and emulsion stability.

[0028] FIG. 1 is a graph showing the results of the oil agent dispersibility evaluation test.

[0029] The powder material for cosmetics of the present invention, the method for producing the powder material for cosmetics, and cosmetics containing the powder material for cosmetics will be described in detail below. However, the present invention is not intended to be limited to the embodiments and examples described below.

[0030] [Powder Material for Cosmetics] The powder material for cosmetics of the present invention includes a powder for cosmetics that has been surface-treated with a surface treatment agent. The surface treatment agent contains the component (a) and the component (b) described below.

[0031] <Component (a): Mannosylerythritol Lipid> Component (a) is a mannosylerythritol lipid (hereinafter also referred to as "MEL") represented by the following formula (1). MEL is a general term for glycolipids composed of mannose, a sugar alcohol, and a fatty acid, and more specifically, MEL comprises a glycolipid formed by dehydration condensation of the hydroxyl group at the 1-position of mannose with the sugar alcohol via a glycosidic bond, and by dehydration condensation of the hydroxyl groups at the 2- and 3-positions of mannose with the fatty acid via an ester bond. In the MEL of the present invention, the hydrogen atoms of the hydroxyl groups at the 4- and 6-positions of mannose are not substituted (R ３ and R ４ is a hydrogen atom), or at least one of them is substituted with an acetyl group (R ３ and R ４ at least one of which is an acetyl group).

[0032]

[0033] In the above formula (1), R １ and R ２ each independently represents an aliphatic acyl group having 6 to 20 carbon atoms; R ３ and R ４ each independently represents a hydrogen atom or an acetyl group, and n represents an integer of 2 to 4.

[0034] MEL represented by the above formula (1) has a substituent R ３ and R ４ MELs can have various structural formulas depending on the presence or absence of an acetyl group (Ac) attached as a glycoside, the type of sugar alcohol glycosidicly bonded to mannose, and the isomer of the sugar alcohol.

[0035] For example, R １ and R ２ are preferably each independently an aliphatic acyl group having 10 to 14 carbon atoms. １ and R ２ By selecting an appropriate aliphatic acyl group as above, the hydrophobicity can be appropriately increased, and therefore the water resistance, dispersibility in oils, and emulsion stability of the powder material for cosmetics can be further improved.

[0036] For example, R３ and R ４ As an embodiment of R ３ and R ４ is an acetyl group (see MEL-A below), R ３ is a hydrogen atom, and R ４ is an acetyl group (see MEL-B and inverted MEL-B described later), R ３ is an acetyl group, and R ４ is a hydrogen atom (see MEL-C below), R ３ and R ４ is a hydrogen atom (see MEL-D and inverted MEL-D described below). Whichever of these embodiments is selected, the water resistance, dispersibility in oils, and emulsion stability of the powder material for cosmetics can be similarly improved.

[0037] n is preferably an integer of 2 to 3, and more preferably 2. By selecting an appropriate integer as n, the hydrophilicity can be appropriately reduced, and therefore the water resistance, dispersibility in oils, and emulsion stability of the powder material for cosmetics can be further improved.

[0038] Specifically, examples of MEL include MEL-A having a structure represented by the following formula (2), MEL-B having a structure represented by the following formula (3) or (4), MEL-C having a structure represented by the following formula (5), and MEL-D having a structure represented by the following formula (6) or (7). MEL-Bs represented by the following formulas (3) and (4) are optical isomers of each other, and MEL-B having a structure represented by the following formula (4), which is the optical isomer of MEL-B having a structure represented by the following formula (3), is referred to as inverted MEL-B. MEL-Ds represented by the following formulas (6) and (7) are optical isomers of MEL-D having a structure represented by the following formula (7), which is the optical isomer of MEL-D having a structure represented by the following formula (6), is referred to as inverted MEL-D.

[0039] Of these, preferred MELs are MEL-A, which is produced by the microorganism Pseudozyma antarctica and has a structure represented by the following formula (2), and MEL-B (inverted type), which is produced by the microorganism Pseudozyma tsukubaensis and has a structure represented by the following formula (4). By selecting an MEL having the above appropriate structure, it is possible to further improve the water resistance, dispersibility in oils, and emulsion stability of the powder material for cosmetics. One type of MEL may be used alone, or two or more types may be used in combination.

[0040] The structures represented by the following formulae (2), (3), (5), and (6) are 4-O-β-D-mannopyranosyl-(2S,3R)-erythritol structures. On the other hand, the term "inverted type" used for the structures represented by the following formulae (4) and (7) is used to distinguish MELs in which optical isomers exist, and in this specification, this term is used to indicate compounds having a 4-O-β-D-mannopyranosyl-meso(2R,3S)-erythritol structure, such as those represented by the following formulae (4) and (7).

[0041] (MEL-A)

[0042]

[0043] (MEL-B)

[0044]

[0045] (Inverted type MEL-B)

[0046]

[0047] (MEL-C)

[0048]

[0049] (MEL-D)

[0050]

[0051] (Inverted MEL-D)

[0052]

[0053] In the above formulas (2) to (7), R １ and R ２ each independently represents an aliphatic acyl group having 6 to 20 carbon atoms. １ and R ２ are each preferably independently an aliphatic acyl group having 10 to 14 carbon atoms.

[0054] The content of component (a) in the powder material for cosmetics is 0.5 to 3 mass %. By setting the content of component (a) within the above appropriate range, the water resistance, dispersibility in oils, and emulsion stability of the powder material for cosmetics can be further improved.

[0055] <Component (b): Ester Compound of Glycerin and Fatty Acid Having 8 to 20 Carbon Atoms> Component (b), an ester compound of glycerin and fatty acid having 8 to 20 carbon atoms, is capable of forming a coating in a state where it forms a complex with component (a) by surface treating a cosmetic powder together with component (a).

[0056] As component (b), diglyceryl tetraisostearate, diglyceryl triisostearate, caprylic / capric triglyceride, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate are preferred. By selecting the above-mentioned appropriate compound as component (b), water resistance, dispersibility in oils, and emulsion stability can be further improved. Component (b) may be used alone or in combination of two or more.

[0057] The content of component (b) in the cosmetic powder material is 0.1 to 10% by mass. By setting the content of component (b) within the above appropriate range, the water resistance, dispersibility in oils, and emulsion stability of the cosmetic powder material can be further improved. Furthermore, by setting the content of component (a) in the cosmetic powder material to 0.5 to 3% by mass and the content of component (b) within the above appropriate range (0.1 to 10% by mass), components (a) and (b) coat the surface of the cosmetic powder, and the cosmetic powder material as a whole retains the properties of a powder. As a result, the obtained cosmetic powder can be further improved in water resistance, dispersibility in oils, and emulsion stability. Furthermore, a refreshing feel can be obtained when used.

[0058] <Cosmetic Powder> A cosmetic powder is a powder that is surface-treated (coated) with a surface treatment agent, and in this respect, it is a powder that serves as a base material for cosmetic powder materials. As the cosmetic powder, any powder that is used in conventionally known cosmetics can be used, and various powders can be used regardless of shape, particle size, particle structure, etc. Examples of cosmetic powders include inorganic powders, organic powders, surfactant metal salt powders, colored pigments, pearl pigments, and metal powder pigments.

[0059] Examples of inorganic powders include titanium oxide, zirconium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, calcium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, talc, mica, kaolin, sericite, muscovite, synthetic mica, phlogopite, lepidolite, biotite, lithia mica, silicic acid, silicic acid anhydride, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, vermiculite, higilite, bentonite, montmorillonite, hectorite, zeolite, ceramic powder, dibasic calcium phosphate, alumina, aluminum hydroxide, boron nitride, boron nitride, and silica.

[0060] Examples of organic powders include polyamide powder, polyester powder, polyethylene powder, polypropylene powder, polystyrene powder, polyurethane powder, benzoguanamine powder, polymethylbenzoguanamine powder, polytetrafluoroethylene powder, polymethyl methacrylate powder, cellulose, silk powder, nylon powder, nylon 12, nylon 6, acrylic powder, acrylic elastomer, styrene-acrylic acid copolymer, divinylbenzene-styrene copolymer, vinyl resin, urea resin, phenolic resin, fluororesin, silicon resin, acrylic resin, melamine resin, epoxy resin, polycarbonate resin, microcrystalline fiber powder, starch powder, and lauroyl lysine.

[0061] Examples of surfactant metal salt powders (metal soaps) include zinc stearate, aluminum stearate, calcium stearate, magnesium stearate, zinc myristate, magnesium myristate, zinc cetyl phosphate, calcium cetyl phosphate, and zinc sodium cetyl phosphate.

[0062] Examples of colored pigments include inorganic red pigments such as iron oxides, such as red iron oxide (red iron oxide), iron hydroxide, and iron titanate, inorganic brown pigments such as γ-iron oxide, inorganic yellow pigments such as yellow iron oxide (yellow iron oxide) and ochre, inorganic black pigments such as black iron oxide (black iron oxide) and carbon black, inorganic purple pigments such as manganese violet and cobalt violet, inorganic green pigments such as chromium hydroxide, chromium oxide, cobalt oxide, and cobalt titanate, inorganic blue pigments such as iron blue and ultramarine, fine particle powders such as fine particle titanium oxide, fine particle cerium oxide, and fine particle zinc oxide, laked tar-based pigments (laked tar-based pigments), laked natural pigments (laked natural pigments), and synthetic resin powders obtained by combining these powders.

[0063] Examples of pearl pigments include pearl mica such as titanium oxide-coated mica, bismuth oxychloride, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, fish scale foil, and titanium oxide-coated colored mica.

[0064] Examples of metal powder pigments include aluminum powder, copper powder, and stainless steel powder.

[0065] Among these, the cosmetic powder is preferably titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, talc, zinc oxide, silicon oxide, pearl mica, mica, or sericite. By selecting an appropriate powder as the cosmetic powder, it is possible to further improve water resistance, dispersibility in oils, and emulsion stability. The cosmetic powder may be used alone or in combination of two or more types.

[0066] <Other Components> The cosmetic powder material of the present invention may contain other components in addition to the cosmetic powder, component (a), and component (b). Examples of other components include antibacterial agents, antiviral agents, disinfectants, deodorizers, antioxidants, stabilizers, pH adjusters, etc.

[0067] <Method for Producing Powder Material for Cosmetics> The powder material for cosmetics of the present invention can be produced by carrying out the following mixing step and heat treatment step.

[0068] (Mixing Step) In the mixing step, a mixture obtained by dispersing, suspending, or dissolving component (a) and component (b) in a solvent is mixed with a cosmetic powder.

[0069] The solvent used in the mixing step is not particularly limited as long as it can disperse, suspend, or dissolve component (a) and component (b), but is preferably, for example, an organic solvent and / or water. By using an organic solvent and / or water as the solvent, no impurities remain in the powder material for cosmetics after the heat treatment step, and a highly pure product can be obtained.

[0070] Examples of the organic solvent include alcohol-based organic solvents such as ethanol, isopropyl alcohol, and isobutanol; hydrocarbon-based organic solvents such as toluene, n-hexane, and cyclohexane; and polar organic solvents such as acetone, ethyl acetate, and butyl acetate.

[0071] In the mixing step, the blending ratio of the solvent to component (a) contained in the mixed solution is preferably adjusted to a mass ratio of 10:1 or more (the mass of the solvent is 10 times or more relative to the mass of component (a)). Specifically, for example, when water is used as the solvent, the blending ratio of the solvent to component (a) is preferably adjusted to a mass ratio of 15:1 or more (the mass of the solvent is 15 times or more relative to the mass of component (a)). When an organic solvent is used as the solvent, the blending ratio of the solvent to component (a) is preferably adjusted to a mass ratio of 10:1 or more (the mass of the solvent is 10 times or more relative to the mass of component (a)). By adjusting the blending ratio of the solvent to component (a) contained in the mixed solution to the above appropriate range, the dispersibility of component (a) in the solvent can be improved.

[0072] In the mixing step, when water is used as the solvent, it is preferable to disperse, suspend, or dissolve component (a) and component (b) in water at 50 to 60° C., and when an organic solvent is used as the solvent, it is preferable to disperse, suspend, or dissolve component (a) and component (b) in the organic solvent at 40 to 60° C. By setting the temperature during mixing within the above appropriate range depending on the type of solvent used, it is possible to more uniformly disperse, suspend, or dissolve component (a) and component (b) in each solvent.

[0073] To mix the mixed liquid with the cosmetic powder, an appropriate mixing means can be adopted depending on the concentration (amount added) and viscosity of the solvent used, and examples include mixers such as a Disper, a Henschel mixer, a Loedige mixer, a kneader, a V-type mixer, a roll mill, a bead mill, and a twin-screw kneader. When mixing using such a mixer, it is preferable to gradually add the mixed liquid to the cosmetic powder under stirring while mixing. By mixing in this manner, the mixed liquid can be more uniformly adhered to the surface of the cosmetic powder.

[0074] (Heat Treatment Step) In the heat treatment step, the mixture obtained in the mixing step is heat-treated. By carrying out this heat treatment step, a powder material for cosmetics is obtained in which the surface of the powder for cosmetics is surface-treated (coated) with the surface treatment agent containing component (a) and component (b).

[0075] In the heat treatment step, the mixture is preferably heat-treated at 70 to 150° C. By heat-treating the mixture at the appropriate temperature, the hydrophilic groups of the component (b), an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin, are oriented toward the cosmetic powder on the surface of the cosmetic powder, thereby making it possible to obtain a cosmetic powder material with excellent water resistance.

[0076] The heat treatment of the mixture can be performed using an electric furnace, a chamber furnace, a kiln, an infrared heater, etc. The heat treatment is usually performed in the presence of air, but when the mixture contains a material that is easily oxidized, it is preferably performed under vacuum or in an inert gas atmosphere.

[0077] After the heat treatment, it is preferable to carry out a pulverization treatment. When pulverization is carried out after the heat treatment, a conventional pulverizer such as a hammer mill, ball mill, sand mill, or jet mill can be used. Since products of the same quality can be obtained using any pulverizer, the pulverizer to be used is not particularly limited.

[0078] <Cosmetics> The cosmetics of the present invention are prepared by blending the above-described powder material for cosmetics. The blending amount of the powder material for cosmetics in the cosmetics is not particularly limited, but is preferably, for example, 0.1 to 95% by mass. By setting the blending amount of the powder material for cosmetics within the above-described appropriate range, the above-described effects of the powder material for cosmetics can be fully exhibited.

[0079] The cosmetic of the present invention may be either an oil-in-water (O / W) emulsion or a water-in-oil (W / O) emulsion, with a water-in-oil (W / O) emulsion being preferred.

[0080] The cosmetic of the present invention may contain ingredients that are commonly used in cosmetics, such as powders other than cosmetic powder materials, surfactants, oils, gelling agents, polymers, cosmetic ingredients, moisturizers, pigments, preservatives, fragrances, etc., within a range that does not impair the effects of the present invention.

[0081] Powder materials for cosmetics according to the present invention (Examples 1 to 14) were prepared, and an oil dispersibility evaluation test, a water repellency (water resistance) test, and an emulsion stability evaluation were carried out. For comparison, powder materials for cosmetics outside the scope of the present invention (Comparative Examples 1 to 12) were prepared, and similar tests and evaluations were carried out.

[0082] [Example 1] To 12.5 g of isopropanol at 40°C, mannosylerythritol lipid (MEL-A, R) was added as a surface treatment agent. １ and R ２ : an aliphatic acyl group having 10 to 14 carbon atoms, R ３ and R ４ A mixed solution was prepared by adding and dispersing 1.0 g of MEL-A (acetyl group) and 0.5 g of diglyceryl tetraisostearate (DG4ISA). Next, while stirring 98.5 g of titanium oxide as a cosmetic powder in a mixer, the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 1. The cosmetic powder material of Example 1 had a total content of MEL-A and DG4ISA of 1.5% by mass.

[0083] Example 2 A mixture was prepared by adding 1.5 g of MEL-A and 0.5 g of DG4ISA as surface treatment agents to 25.0 g of isopropanol at 40°C and dispersing the mixture. Next, 98.0 g of yellow iron oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 2. The cosmetic powder material of Example 2 had a total content of MEL-A and DG4ISA of 2.0% by mass.

[0084] Example 3 A mixture was prepared by dispersing 1.0 g of MEL-A and 0.5 g of DG4ISA as surface treatment agents in 25.0 g of isopropanol at 40°C. Next, 98.5 g of red iron oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 3. The cosmetic powder material of Example 3 had a total content of MEL-A and DG4ISA of 1.5% by mass.

[0085] Example 4 A mixture was prepared by adding 1.0 g of MEL-A and 0.5 g of DG4ISA as surface treatment agents to 12.5 g of isopropanol at 40°C and dispersing them. Next, 98.5 g of black iron oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 4. The cosmetic powder material of Example 4 had a total content of MEL-A and DG4ISA of 1.5% by mass.

[0086] Example 5: 0.5 g of MEL-A and 0.1 g of DG4ISA were added as surface treatment agents to 12.5 g of isopropanol at 40°C and dispersed to prepare a mixed solution. Next, 99.4 g of titanium oxide (cosmetic powder) was stirred in a mixer while the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 5. The cosmetic powder material of Example 5 had a total content of MEL-A and DG4ISA of 0.6% by mass.

[0087] Example 6 A mixture was prepared by adding 3.0 g of MEL-A and 10.0 g of DG4ISA as surface treatment agents to 12.5 g of isopropanol at 40°C and dispersing the mixture. Next, 87.0 g of titanium oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain the cosmetic powder material of Example 6. The cosmetic powder material of Example 6 had a total content of MEL-A and DG4ISA of 13.0% by mass.

[0088] Example 7 A mixture was prepared by adding 1.0 g of MEL-A and 0.5 g of DG4ISA as surface treatment agents to 15.0 g of water at 50°C and dispersing the mixture. Next, 98.5 g of titanium oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain the cosmetic powder material of Example 7. The cosmetic powder material of Example 7 had a total content of MEL-A and DG4ISA of 1.5% by mass.

[0089] Example 8 A mixture was prepared by adding 1.5 g of MEL-A and 0.5 g of DG4ISA as surface treatment agents to 25.0 g of water at 50°C and dispersing the mixture. Next, 98.0 g of yellow iron oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 8. The cosmetic powder material of Example 8 had a total content of MEL-A and DG4ISA of 2.0% by mass.

[0090] Example 9 A mixture was prepared by adding 1.0 g of MEL-A and 0.5 g of DG4ISA as surface treatment agents to 15.0 g of water at 50°C and dispersing the mixture. Next, 98.5 g of red iron oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 9. The cosmetic powder material of Example 9 had a total content of MEL-A and DG4ISA of 1.5% by mass.

[0091] Example 10: 1.0 g of MEL-A and 0.5 g of DG4ISA were added as surface treatment agents to 15.0 g of water at 50°C and dispersed to prepare a mixed solution. Next, 98.5 g of black iron oxide (cosmetic powder) was stirred in a mixer while the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 10. The cosmetic powder material of Example 10 had a total content of MEL-A and DG4ISA of 1.5% by mass.

[0092] [Example 11] In 15.0 g of water at 50°C, inverted MEL-B (R １ and R ２ : an aliphatic acyl group having 10 to 14 carbon atoms, R ３ : hydrogen atom, R ４ A mixture was prepared by adding and dispersing 1.0 g of inverted MEL-B (acetyl group) and 0.5 g of DG4ISA. Next, while stirring 98.5 g of titanium oxide as a cosmetic powder in a mixer, the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 11. The cosmetic powder material of Example 11 had a total content of inverted MEL-B and DG4ISA of 1.5% by mass.

[0093] Example 12 A mixture was prepared by adding 1.5 g of inverted MEL-B and 0.5 g of DG4ISA as surface treatment agents to 15.0 g of water at 50°C and dispersing them. Next, 98.0 g of yellow iron oxide (cosmetic powder) was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 12. The cosmetic powder material of Example 12 had a total content of inverted MEL-B and DG4ISA of 2.0% by mass.

[0094] Example 13 A mixed solution was prepared by adding 1.0 g of inverted MEL-B and 0.5 g of DG4ISA as surface treatment agents to 15.0 g of water at 50°C and dispersing them. Next, 98.5 g of red iron oxide (cosmetic powder) was stirred in a mixer while the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 13. The cosmetic powder material of Example 13 had a total content of inverted MEL-B and DG4ISA of 1.5% by mass.

[0095] Example 14 A mixture was prepared by adding 1.0 g of inverted MEL-B and 0.5 g of DG4ISA as surface treatment agents to 15.0 g of water at 50°C and dispersing them. Next, 98.5 g of black iron oxide as a cosmetic powder was stirred in a mixer while the mixture was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Example 14. The cosmetic powder material of Example 14 had a total content of inverted MEL-B and DG4ISA of 1.5% by mass.

[0096] [Comparative Example 1] 1.0 g of MEL-A was used as the surface treatment agent, and 99.0 g of titanium oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 1, to obtain a cosmetic powder material of Comparative Example 1. The cosmetic powder material of Comparative Example 1 had a MEL-A content of 1.0% by mass.

[0097] [Comparative Example 2] 2.0 g of MEL-A was used as the surface treatment agent, and 98.0 g of yellow iron oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 2, to obtain a cosmetic powder material of Comparative Example 2. The cosmetic powder material of Comparative Example 2 had a MEL-A content of 2.0% by mass.

[0098] [Comparative Example 3] 1.0 g of MEL-A was used as the surface treatment agent, and 99.0 g of red iron oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 3, to obtain a cosmetic powder material of Comparative Example 3. The cosmetic powder material of Comparative Example 3 had a MEL-A content of 1.0% by mass.

[0099] [Comparative Example 4] 1.0 g of MEL-A was used as the surface treatment agent, and 99.0 g of black iron oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 4, to obtain a cosmetic powder material of Comparative Example 4. The cosmetic powder material of Comparative Example 4 had a MEL-A content of 1.0% by mass.

[0100] [Comparative Example 5] 2.0 g of DG4ISA was used as the surface treatment agent, and 98.0 g of titanium oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 1, to obtain a cosmetic powder material of Comparative Example 5. The cosmetic powder material of Comparative Example 5 had a DG4ISA content of 2.0% by mass.

[0101] [Comparative Example 6] 2.0 g of DG4ISA was used as the surface treatment agent, and 98.0 g of yellow iron oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 2, to obtain a cosmetic powder material of Comparative Example 6. The cosmetic powder material of Comparative Example 6 had a DG4ISA content of 2.0% by mass.

[0102] [Comparative Example 7] 2.0 g of DG4ISA was used as the surface treatment agent, and 98.0 g of red iron oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 3, to obtain a cosmetic powder material of Comparative Example 7. The cosmetic powder material of Comparative Example 7 had a DG4ISA content of 2.0% by mass.

[0103] [Comparative Example 8] 2.0 g of DG4ISA was used as the surface treatment agent, and 98.0 g of black iron oxide was used as the cosmetic powder. The rest of the procedure was the same as in Example 4, to obtain a cosmetic powder material of Comparative Example 8. The cosmetic powder material of Comparative Example 8 had a DG4ISA content of 2.0% by mass.

[0104] Comparative Example 9 Titanium oxide powder was used as the cosmetic powder material of Comparative Example 9 without any surface treatment.

[0105] [Comparative Example 10] 0.3 g of MEL-A and 0.1 g of DG4ISA were added as surface treatment agents to 12.5 g of isopropanol at 40°C and dispersed to prepare a mixed solution. Next, 99.6 g of titanium oxide (cosmetic powder) was stirred with a mixer while the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized with a hammer mill to obtain a cosmetic powder material of Comparative Example 10. The cosmetic powder material of Comparative Example 10 had a total content of MEL-A and DG4ISA of 0.4% by mass.

[0106] Comparative Example 11: 4.0 g of MEL-A and 10.0 g of DG4ISA were added as surface treatment agents to 12.5 g of isopropanol at 40°C and dispersed to prepare a mixed solution. Next, 86.0 g of titanium oxide (cosmetic powder) was stirred in a mixer while the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Comparative Example 11. The cosmetic powder material of Comparative Example 11 had a total content of MEL-A and DG4ISA of 14.0% by mass.

[0107] Comparative Example 12: 3.0 g of MEL-A and 11.0 g of DG4ISA were added as surface treatment agents to 12.5 g of isopropanol at 40°C and dispersed to prepare a mixed solution. Next, 86.0 g of titanium oxide (cosmetic powder) was stirred in a mixer while the mixed solution was added dropwise and mixed for 20 minutes to prepare a mixture. This mixture was heat-treated at 110°C for 6 hours, and the dried powder obtained by the heat treatment was pulverized in a hammer mill to obtain a cosmetic powder material of Comparative Example 12. The cosmetic powder material of Comparative Example 12 had a total content of MEL-A and DG4ISA of 14.0% by mass.

[0108] [Water Repellency (Water Resistance) Test] As a water repellency test, the contact angles of the cosmetic powder materials of Examples 1 to 4, Examples 7 to 14, and Comparative Examples 1 to 9 were measured as follows. First, an appropriate amount of cosmetic powder material was packed into a mold and compressed at a compression force of 10 MPa to prepare tablets for contact angle measurement. The prepared tablets were placed in a contact angle measuring device (contact angle meter LSE-B100, manufactured by NIC Co., Ltd.), and a water droplet was dropped onto the tablet using a syringe, and the contact angle (°) formed between the water droplet and the tablet was measured. The results are shown in Table 1.

[0109]

[0110] As shown in Table 1, in the untreated cosmetic powder material of Comparative Example 9, water droplets soaked into the cosmetic powder material, and no water droplets were present on the surface, so no contact angle was generated. When comparing the cosmetic powder materials of Examples 1 to 4 with those of Comparative Examples 1 to 4, the cosmetic powder materials of Examples 1 to 4 tended to exhibit superior water repellency. Furthermore, when comparing the cosmetic powder materials of Examples 11 to 14 with those of Comparative Examples 1 to 8, the cosmetic powder materials of Examples 11 to 14 tended to exhibit superior water repellency. Therefore, it can be said that the cosmetic powder material of the present invention, which is surface-treated with a combination of MEL (component (a)) and DG4ISA (component (b)), exhibits higher water resistance than a cosmetic powder material coated with only either MEL or DG4ISA. Furthermore, the cosmetic powder materials of Examples 7 to 10 (and, as mentioned above, Examples 11 to 14) also exhibited water repellency superior to that of the cosmetic powder materials of Comparative Examples 1 to 4. This indicates that high water resistance can be obtained even when water, rather than an organic solvent, is used to prepare the mixed solution.

[0111] [Oil Dispersibility Evaluation Test] It is known that the greater the dispersibility of a cosmetic powder material in an oil, the lower the viscosity of the dispersion in which the cosmetic powder material is dispersed in an oil. Therefore, as an oil dispersibility evaluation test, 60 g of the cosmetic powder material of Examples 1, 7, and 11, and Comparative Examples 1 and 5, and 40 g of oil were mixed and stirred at 1000 rpm for 10 minutes to prepare a dispersion, and the viscosity of the dispersion was measured using a Brookfield viscometer. The oils used were tri(caprylic / capric)glyceryl, an ester-based oil, squalane, a hydrocarbon-based oil, and dimethicone oil, a silicone-based oil. The results are shown in Figure 1.

[0112] FIG. 1 is a graph showing the results of an oil dispersibility evaluation test. The viscosity of dispersions made using Examples 1, 7, and 11, which are cosmetic powder materials whose surfaces were coated (surface-treated) with MEL and DG4ISA, and Comparative Example 5, which was surface-coated with only DG4ISA, was lower than that of dispersions made using Comparative Example 1, which was surface-coated with only MEL. The viscosity of the dispersion made using Example 11 was also lower than that of dispersions made using Comparative Example 5. Therefore, by combining MEL (component (a)) and DG4ISA (component (b)) and performing surface treatment, the cosmetic powder material of the present invention can be said to maintain dispersibility equal to or greater than that of DG4ISA and to have superior dispersibility in oils compared to a cosmetic powder material coated with only MEL. Furthermore, the cosmetic powder materials of Examples 1, 7, and 11 had similar dispersibility in oils. Therefore, it can be said that there is no significant difference in the dispersibility of the cosmetic powder material in oils between using an organic solvent and using water to prepare the mixture.

[0113] [Evaluation of Emulsion Stability] It is known that pigments coated with MEL exhibit high emulsion stability by forming Pickering emulsions even without the use of surfactants. To confirm that this property is not lost when MEL is combined with an ester compound for composite treatment, the following emulsion stability evaluation was performed using the cosmetic powder materials of Examples 1, 5-7, and 11, as well as Comparative Examples 1, 5, and 10-12. First, 5 g of an alkane having 9 to 12 carbon atoms (C9-12 alkane) and 0.5 g of the cosmetic powder material were placed in a UM sample bottle (50 mL) and shaken by hand. Then, 5 g of ion-exchanged water was added and further shaken. The UM sample bottle was allowed to stand. After 1 minute, 30 minutes, and 1 hour, the appearance of the dispersion inside the UM sample bottle was observed and evaluated on a four-point scale from 1 to 4 using the following evaluation criteria. A higher score indicates a better evaluation, and a score of 4 was considered to indicate sufficient emulsion stability. The results are shown in Table 2. (Evaluation criteria) 4 points: The emulsion remains even after 1 hour of standing (good). 3 points: The emulsion breaks down within 1 hour of standing (average). 2 points: The emulsion breaks down within 30 minutes of standing (slightly poor). 1 point: The emulsion breaks down within 1 minute of standing (poor).

[0114]

[0115] As shown in Table 2, the powder materials for cosmetics of Examples 1, 7, 11, 5, 6, and Comparative Example 1 were evaluated as having good emulsion stability, with an emulsion stability rating of 4 points. Therefore, it can be said that the powder materials for cosmetics of the present invention have excellent emulsion stability, similar to the powder materials for cosmetics coated with only MEL. On the other hand, the powder materials for cosmetics of Comparative Examples 5 and 10 to 12 were evaluated as having emulsion stability of 3 points or less, with insufficient emulsion stability.

[0116] [Example 15, Comparative Example 13, and Comparative Example 14] Cosmetics (W / O type liquid foundation) of Example 15, Comparative Example 13, and Comparative Example 14 were obtained using the following manufacturing methods and formulations shown in Table 3. The blending amount of each component is expressed in mass%.

[0117] (Method of manufacturing W / O type liquid foundation) First, component A, an oil-based component, was mixed and thoroughly stirred and mixed using a disper until homogeneous. Component B, a powder component, was gradually added to this mixture of component A while stirring with a disper, and thoroughly stirred and mixed until homogeneous. Component C, an aqueous component, was then mixed, and then emulsified by gradually adding the mixture of component C to the mixture of components A and B while stirring with a disper.

[0118]

[0119] The W / O type liquid foundations obtained in Example 15, Comparative Example 13, and Comparative Example 14 were evaluated for dispersibility by observation using a microscope, and for the feel when applied to the skin. The feel was evaluated in terms of weight, adhesion, and usability. Adhesion and usability were evaluated on a four-point scale according to the following criteria. The results are shown in Table 4. (Evaluation criteria) Adhesion A: Good makeup retention B: Slightly good makeup retention C: Slightly poor makeup retention D: Poor makeup retention Feel A: Good usability B: Slightly good usability C: Slightly poor usability D: Poor usability

[0120]

[0121] As a result of the dispersibility evaluation, powder aggregation was observed in the cosmetic of Comparative Example 13. On the other hand, the cosmetics of Example 15 and Comparative Example 14 were uniformly dispersed. It was confirmed that the cosmetic of the present invention has excellent dispersibility equivalent to that of a cosmetic surface-treated with DG4ISA alone.

[0122] As a result of the feel evaluation, the cosmetic of Comparative Example 14 was light and had poor adhesion. On the other hand, the cosmetics of Comparative Example 13 and Example 15 showed excellent results in all evaluation items. It was confirmed that the cosmetic of the present invention has an excellent feel that could not be obtained by treatment with DG4ISA alone.

[0123] [Example 16, Comparative Example 15, and Comparative Example 16] Using the manufacturing methods below, cosmetics (W / O type liquid foundations) of Example 16, Comparative Example 15, and Comparative Example 16 were obtained according to the formulations shown in Table 5. The blending amount of each component is expressed in mass%.

[0124] (Method of manufacturing W / O type liquid foundation) First, the oil-based components, component A (components A1 and A2), were mixed and thoroughly stirred and mixed using a disper until uniform. To this mixture of components A under stirring using a disper, component B, a powder component, was gradually added and thoroughly stirred and mixed until uniform. After mixing the aqueous components, component C (components C1 and C2), the mixture of components C was gradually added to the mixture of components A and B under stirring using a disper, thereby emulsifying the mixture.

[0125]

[0126] The W / O type cream foundations obtained in Example 16, Comparative Example 15, and Comparative Example 16 were evaluated for dispersibility by observation using a microscope and for the feel when applied to the skin in the same manner as described above. The results are shown in Table 6.

[0127]

[0128] As a result of the dispersibility evaluation, powder aggregation was observed in the cosmetic of Comparative Example 15. On the other hand, the cosmetics of Example 16 and Comparative Example 16 were uniformly dispersed. It was confirmed that the cosmetic of the present invention has excellent dispersibility equivalent to that of a cosmetic surface-treated with DG4ISA alone.

[0129] As a result of the feel evaluation, the cosmetic of Comparative Example 16 was found to be heavy and had an inferior feel when used. On the other hand, the cosmetic of Example 16 showed excellent results in all evaluation items. It was confirmed that the cosmetic of the present invention has an excellent feel that could not be obtained by treatment with MEL or DG4ISA alone.

[0130] [Example 17, Comparative Example 17, and Comparative Example 18] Using the manufacturing methods below, cosmetics (W / O type concealers) of Example 17, Comparative Example 17, and Comparative Example 18 were obtained according to the formulations shown in Table 7. The blending amount of each component is expressed in mass%.

[0131] (Method of manufacturing W / O type concealer) First, component A, an oil-based component, was mixed and thoroughly stirred and mixed using a disper until uniform. Component B, a powder component, was gradually added to this mixture of component A while stirring with a disper, and thoroughly stirred and mixed until uniform. Component C, an aqueous component, was then mixed, and emulsified by gradually adding the mixture of component C to the mixture of components A and B while stirring with a disper.

[0132]

[0133] The W / O type concealers obtained in Example 17, Comparative Example 17, and Comparative Example 18 were evaluated for dispersibility by observation using a microscope in the same manner as above. The feel when applied to the skin was also evaluated. In the evaluation of the feel, the weight, adhesion, and feel in use were evaluated in the same manner as above, and the spreadability was evaluated on a four-point scale according to the following criteria. The results are shown in Table 8. (Evaluation criteria) Spreadability A: Easy to spread B: Slightly easy to spread C: Slightly difficult to spread D: Difficult to spread

[0134]

[0135] As a result of the dispersibility evaluation, powder aggregation was observed in the cosmetic of Comparative Example 17. On the other hand, the cosmetics of Example 17 and Comparative Example 18 were uniformly dispersed. It was confirmed that the cosmetic of the present invention has excellent dispersibility equivalent to that of a cosmetic surface-treated with DG4ISA alone.

[0136] As a result of the feel evaluation, the cosmetic of Comparative Example 17 was heavy, and the cosmetic of Comparative Example 18 was poor in adhesion, spreadability, and feel in use. On the other hand, the cosmetic of Example 17 showed excellent results in all evaluation items. It was confirmed that the cosmetic of the present invention has an excellent feel that cannot be obtained by treatment with MEL or DG4ISA alone.

[0137] The cosmetic powder material of the present invention is suitable for use in cosmetics, and is particularly suited for use in pigmented makeup cosmetics such as foundation, eye shadow, eyebrow pencil, and blusher.

Claims

1. A powder material for cosmetics containing a cosmetic powder that has been surface-treated with a surface treatment agent, wherein the surface treatment agent contains: component (a): mannosylerythritol lipid represented by the following formula (1); and component (b): an ester compound of glycerin and a fatty acid having 8 to 20 carbon atoms, wherein the content of component (a) is 0.5 to 3% by mass, and the content of component (b) is 0.1 to 10% by mass. (In the formula (1), R １ and R ２ each independently represents an aliphatic acyl group having 6 to 20 carbon atoms; R ３ and R ４ each independently represents a hydrogen atom or an acetyl group, and n represents an integer of 2 to 4.

2. A powder material for cosmetics according to claim 1, wherein component (b) is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, tri(caprylic / capric)glyceryl, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate.

3. The above R １ and R ２ and each independently represent an aliphatic acyl group having 10 to 14 carbon atoms.

4. The cosmetic powder material according to claim 1, wherein the cosmetic powder is at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, talc, zinc oxide, silicon oxide, pearl mica, mica, and sericite.

5. A method for producing a powder material for cosmetics, comprising a mixing step of mixing a cosmetic powder with a mixture obtained by dispersing, suspending, or dissolving in a solvent: component (a): mannosylerythritol lipid represented by the following formula (1); and component (b): an ester compound of glycerin and a fatty acid having 8 to 20 carbon atoms; and a heat treatment step of heat treating the mixture obtained in the mixing step. (In the formula (1), R １ and R ２ each independently represents an aliphatic acyl group having 6 to 20 carbon atoms; R ３ and R ４ each independently represents a hydrogen atom or an acetyl group, and n represents an integer of 2 to 4.

6. A method for producing a powder material for cosmetics as described in claim 5, wherein in the mixing step, the blending ratio of the solvent to component (a) contained in the mixed liquid is adjusted to a mass ratio of 10:1 or more.

7. The method for producing a powder material for cosmetics according to claim 5 or 6, wherein the mixture is heat-treated at 70 to 150°C in the heat-treatment step.

8. A method for producing a powder material for cosmetics according to claim 5 or 6, wherein the solvent is an organic solvent and / or water.

9. A cosmetic containing the powder material for cosmetics according to any one of claims 1 to 4.

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