Powdered materials for cosmetics, and cosmetics

Abstract

This invention provides a powder material for cosmetics that exhibits excellent water repellency, dispersibility and dispersion stability in oily components, and a pleasant feel. [Solution] A cosmetic powder material obtained by surface-treating a cosmetic powder with a complex metal soap of a fatty acid and an acylated amino acid. The fatty acid is preferably a fatty acid having 12 to 22 carbon atoms. The fatty acid is preferably myristic acid and / or stearic acid. The acylated amino acid is preferably a gemini-type acylated amino acid with 2 chains and 3 hydrophilic groups represented by a specific formula. The complex metal soap is preferably at least one selected from the group consisting of magnesium salts, calcium salts, aluminum salts, and zinc salts.

Description

[Technical Field]

[0001] This invention relates to a powder material for cosmetics and a cosmetic product containing the said powder material. [Background technology]

[0002] Traditionally, cosmetic powders such as cellulose have been used as cosmetic powder materials (raw materials) because they are naturally derived raw materials and possess functionalities such as providing a soft feel, smoothness, and rolling properties. However, because cellulose powder is hydrophilic, it is difficult to stably disperse (stabilize) it in formulations containing a large amount of oily components, and it is often used as a cosmetic powder material after being given water-repellent properties through surface treatment or other means.

[0003] For example, it has been proposed to improve water repellency and moistness by surface-treating cellulose powder with a metal soap of fatty acids such as stearic acid, or a metal salt of acylated amino acids with a divalent or higher valency, such as dilauroyl glutamate lysine (see Patent Documents 1-3). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-002552 [Patent Document 2] Japanese Patent Publication No. 2024-144055 [Patent Document 1] Japanese Patent Publication No. 2022-131884 [Overview of the project] [Problems that the invention aims to solve]

[0005] Although the cosmetic powder materials described in Patent Documents 1 to 3 exhibit a certain degree of water repellency, when applied to cosmetics and incorporated into water-in-oil emulsion formulations, there is a risk of poor dispersion in the oil phase (oily component). For example, the shear force during mixing when preparing cosmetics may cause the surface treatment material to peel off, potentially leading to aggregation of cellulose powder (particles). Furthermore, aggregation of cellulose powder in the oil phase may occur over time. When such aggregation occurs, the water repellency and moisturizing effect will decrease.

[0006] The present invention has been made in view of the above circumstances, and aims to provide a powder material for cosmetics that is excellent in water repellency, dispersibility and dispersion stability in oily components, and feel, and cosmetics containing said powder material. [Means for solving the problem]

[0007] As a result of diligent research to solve the above problems, the inventors found that in the following cases (1) to (3), the water repellency and oil dispersion properties are inferior to at least one of them. (1) When surface-treating cosmetic powders with fatty acid metal soaps, (2) When a powder for cosmetic use is surface-treated with a divalent or higher metal salt of an acylated amino acid, (3) When cosmetic powders are surface-treated with fatty acid metal soaps and divalent or higher metal salts of acylated amino acids. In contrast, we have found that surface treatment of cosmetic powder materials with a composite metal soap obtained by simultaneously metal-chlorinating (saponifying) fatty acids and acylated amino acids with divalent or higher metal ions results in superior water repellency, dispersibility and dispersion stability in oily components, and feel compared to the cases described in (1) to (3) above, i.e., surface treatment with a metal soap obtained by saponifying fatty acids alone, or with a divalent or higher metal salt obtained by metal-chlorinating acylated amino acids alone. This has led to the completion of the present invention.

[0008] In other words, the characteristic configuration of the cosmetic powder material according to the present invention for solving the above problems is: The cosmetic powder is surface-treated with a complex metal soap composed of fatty acids and acylated amino acids.

[0009] According to this cosmetic powder material, surface treatment of cosmetic powder with a complex metal soap of fatty acids and acylated amino acids results in superior water repellency, dispersibility and dispersion stability in oily components, and feel compared to surface treatment with a metal soap obtained by saponifying fatty acids alone, or with a metal salt obtained by chlorinating acylated amino acids alone with a metal salt of a metal

[0010] In the powder material for cosmetics according to the present invention, The fatty acid is preferably a fatty acid having 12 to 22 carbon atoms.

[0011] With this cosmetic powder material configuration, by selecting a fatty acid with the above number of carbon atoms as the fatty acid, the water repellency, dispersibility and dispersion stability in the oily component, and feel of the cosmetic powder material can be improved.

[0012] In the powder material for cosmetics according to the present invention, The fatty acid is preferably myristic acid and / or stearic acid.

[0013] With this cosmetic powder material configuration, by selecting the above compound as the fatty acid, the water repellency, dispersibility and dispersion stability in the oily component, and feel of the cosmetic powder material can be improved.

[0014] In the powder material for cosmetics according to the present invention, The acylated amino acid is preferably a gemini-type acylated amino acid with two chains and three hydrophilic groups, as shown in formula (1) below.

[0015] [ka] In equation (1) above, R 1 and R 2 Each of these is an alkyl group having 8 to 14 carbon atoms, X is a hydrogen atom or a sodium atom, m is an integer from 1 to 3, and n is an integer from 1 to 3.

[0016] According to the cosmetic powder material of this configuration, by selecting the gemini-type acylated amino acid having two chains and three hydrophilic groups as the acylated amino acid, the water repellency, dispersibility and dispersion stability in oily components, and the feel of the cosmetic powder material can be improved.

[0017] In the cosmetic powder material according to the present invention, The composite metal soap is preferably at least one selected from the group consisting of magnesium salts, calcium salts, aluminum salts, and zinc salts.

[0018] According to the cosmetic powder material of this configuration, by selecting the above salts as the composite metal soap, the water repellency, dispersibility and dispersion stability in oily components, and the feel of the cosmetic powder material can be improved.

[0019] In the cosmetic powder material according to the present invention, The composite metal soap is preferably a precipitate formed by adding at least one selected from magnesium ions, calcium ions, aluminum ions, and zinc ions to an aqueous solution containing the acylated amino acid and the fatty acid.

[0020] According to the cosmetic powder material of this configuration, by using the composite metal soap as the above precipitate, the water repellency, dispersibility and dispersion stability in oily components, and the feel of the cosmetic powder material can be improved.

[0021] In the cosmetic powder material according to the present invention, The cosmetic powder is preferably spherical cellulose.

[0022] According to the cosmetic powder material of this configuration, by selecting spherical cellulose as the cosmetic powder, the water repellency, dispersibility and dispersion stability in oily components, and the feel of the cosmetic powder material can be improved.

[0023] In the cosmetic powder material according to the present invention, The content of the composite metal soap is preferably 0.1 to 25.0% by mass relative to 100% by mass of the cosmetic powder.

[0024] With the present configuration of the cosmetic powder material, by setting the content of the composite metal soap within the above range, the water repellency, dispersibility and dispersion stability in the oily components, and feel of the cosmetic powder material can be improved.

[0025] Another characteristic configuration of the powder material for cosmetics according to the present invention, which solves the above problem, is: The surface of the cosmetic powder is coated with a complex metal soap of fatty acids and acylated amino acids.

[0026] According to this cosmetic powder material, the cosmetic powder is coated with a complex metal soap of fatty acids and acylated amino acids. Compared to cases where the powder is coated with a metal soap obtained by saponifying fatty acids alone, or with a metal salt obtained by chlorinating acylated amino acids alone with a metal of divalent or higher valence, the material exhibits superior water repellency, dispersibility and dispersion stability in oily components, and feel.

[0027] The cosmetic composition according to the present invention, which solves the above problems, This is due to the incorporation of the aforementioned cosmetic powder materials.

[0028] The cosmetic composition with this structure, by incorporating the aforementioned cosmetic powder materials, exhibits excellent water repellency, dispersibility and dispersion stability within the oily components, and a pleasant feel. [Modes for carrying out the invention]

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

[0030] [Powdered ingredients for cosmetics] The cosmetic powder material of the present invention is obtained by surface-treating cosmetic powder with a complex metal soap of fatty acids and acylated amino acids.

[0031] <Cosmetic powder> Cosmetic powders are powders that are surface-treated (coated) with a surface treatment agent (complex metal soap), and in this respect, they are powders that serve as the base material for cosmetic powder materials. As cosmetic powders, powders that are conventionally known and applied to cosmetics can be used, and various powders can be used regardless of their 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.

[0032] Examples of inorganic powders include titanium dioxide, 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, rose mica, biotite, lithium mica, silicic acid, anhydrous silicic acid, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, tungstate metal salts, hydroxyapatite, vermiculite, hydylite, bentonite, montmorillonite, hectorite, zeolite, ceramic powder, dicalcium phosphate, alumina, aluminum hydroxide, boron nitride, boron nitride, silica, and the like.

[0033] 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.

[0034] 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 sodium zinc cetyl phosphate.

[0035] Examples of colored pigments include inorganic red pigments such as 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 and ochre; inorganic black pigments such as 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 Prussian blue and ultramarine; fine particle powders such as fine particle titanium dioxide, fine particle cerium oxide, and fine particle zinc oxide; lake-formed tar-based dyes (lake-formed tar-based dyes); lake-formed natural dyes (lake-formed natural dyes); and synthetic resin powders that are composites of these powders.

[0036] Examples of pearl pigments include pearl mica such as titanium dioxide-coated mica, bismuth oxychloride, titanium dioxide-coated bismuth oxychloride, titanium dioxide-coated talc, fish scale foil, and titanium dioxide-coated colored mica.

[0037] Examples of metal powder pigments include aluminum powder, copper powder, and stainless steel powder.

[0038] Of these, spherical cellulose (spherical cellulose powder) is preferred for cosmetic powders. By selecting spherical cellulose as the cosmetic powder, the water repellency, dispersibility and dispersion stability in oily components, and feel of the cosmetic powder material can be improved. Spherical cellulose includes forms ranging from perfectly spherical to nearly spherical, and the closer the shape is to perfectly spherical, the better the slipperiness when incorporated into cosmetics. The average particle size of spherical cellulose is preferably 0.1 to 50 μm. By setting the average particle size of spherical cellulose within the above range, the water repellency, dispersibility and dispersion stability in oily components, and feel of the cosmetic powder material can be improved. It can also improve slipperiness, adhesion to lips and skin, and color development. As spherical cellulose, commercially available products can be used, for example, specifically CELLULOBEADS D-5, CELLULOBEADS D-10, CELLULOBEADS D-30 [all manufactured by Daito Chemical Industries, Ltd.], etc. The average particle size of CELLULOBEADS D-5 is 8.7 μm (measured using a laser diffraction particle size analyzer), the average particle size of CELLULOBEADS D-10 is 14.3 μm (measured using a laser diffraction particle size analyzer), and the average particle size of CELLULOBEADS D-30 is 28.8 μm (measured using a laser diffraction particle size analyzer). The cosmetic powder may be used individually or as a mixture of two or more types.

[0039] <Compound Metal Soaps>

[0040] The composite metal soap of this embodiment is formed by the saponification (divalent or higher metal chlorination) of fatty acids and acylated amino acids (not individually) in combination with a divalent or higher metal salt.

[0041] By surface-treating cosmetic powders with a complex metal soap of fatty acids and acylated amino acids, the cosmetic powder material exhibits superior water repellency, dispersibility and dispersion stability in oily components, and feel compared to surface-treating with a metal soap obtained by saponifying fatty acids alone, or with a metal salt obtained by chlorinating acylated amino acids alone with a metal of divalent or higher valency. Furthermore, cosmetic powders surface-treated with a complex metal soap of fatty acids and acylated amino acids are substantially equivalent to cosmetic powders whose surface is coated with a complex metal soap of fatty acids and acylated amino acids.

[0042] (fatty acid) The fatty acid may be a straight-chain fatty acid or a branched fatty acid, and may be saturated or unsaturated. The fatty acid is not particularly limited, but for example, fatty acids with 12 to 22 carbon atoms are preferred. By selecting a fatty acid with the above number of carbon atoms, the water repellency, dispersibility and dispersion stability in the oily components, and feel of the cosmetic powder material can be improved.

[0043] Examples of fatty acids with 12 to 22 carbon atoms include lauric acid (12 carbon atoms), myristic acid (14 carbon atoms), palmitic acid (16 carbon atoms), stearic acid (18 carbon atoms), arachidic acid (20 carbon atoms), and behenic acid (22 carbon atoms). Of these, myristic acid and stearic acid are preferred fatty acids. By selecting the above compounds as fatty acids, the water repellency, dispersibility and dispersion stability in oily components, and feel of cosmetic powder materials can be improved. Fatty acids may be used individually or in mixtures of two or more types.

[0044] (Acylated amino acids) The acylated amino acid is not particularly limited, but for example, a gemini-type acylated amino acid with two chains and three hydrophilic groups, as shown in formula (1) below, is preferred.

[0045] [ka] In formula (1), R 1 and R2 is each independently an alkyl group having 8 to 14 carbon atoms, preferably 10 to 12 carbon atoms, X is a hydrogen atom or a sodium atom, m is an integer of 1 to 3, and n is an integer of 1 to 3. Examples of the compound represented by the formula (1) include, for example, R in the above formula (1) 1 and R 2 are each an alkyl group having 11 carbon atoms, X is a sodium atom, m is 2, and n is 2, that is, a sodium salt of a condensate of N-lauroyl-L-glutamic acid and L-lysine represented by the following formula (1a), etc.

[0046]

Chemical formula

[0047] Examples of the compound represented by the above formula (1a) include commercially available products of natural origin. For example, using a natural fatty acid and a natural amino acid as raw materials, Perisea L-30 (sodium dilauroyl glutamate lysine (C 40 H 69 N4Na3O 10 )) 30% by mass aqueous solution, manufactured by Asahi Kasei Fine Chemical Co., Ltd.) can be mentioned.

[0048] By selecting the above gemini-type acylated amino acid having two chains and three hydrophilic groups as the acylated amino acid, the water repellency of the cosmetic powder material, the dispersibility and dispersion stability in the oily component, and the feel can be improved.

[0049] The composite metal soap is preferably a precipitate obtained by adding at least one selected from magnesium ions, calcium ions, aluminum ions, and zinc ions to an aqueous solution containing acylated amino acids and fatty acids. In other words, the composite metal soap is preferably a precipitate obtained by adding at least one selected from magnesium ions, calcium ions, aluminum ions, and zinc ions to an aqueous solution containing acylated amino acids and fatty acids. By using the composite metal soap as the above precipitate, the water repellency, dispersibility and dispersion stability in the oily components, and feel of the cosmetic powder material can be improved.

[0050] As described above, the composite metal soap is preferably at least one selected from the group consisting of magnesium salts, calcium salts, aluminum salts, and zinc salts (i.e., the precipitate mentioned above). By selecting the above salts as the composite metal soap, the water repellency, dispersibility and dispersion stability in oily components, and feel of the cosmetic powder material can be improved.

[0051] The content of the composite metal soap is not particularly limited and can be appropriately set to an amount that improves the water repellency, dispersibility and dispersion stability in the oily components, and feel of the cosmetic powder material. For example, the content of the composite metal soap is preferably 0.1 to 25.0% by mass, and more preferably 1 to 7.5% by mass, based on 100% by mass of the cosmetic powder. By setting the content of the composite metal soap within the above range, the water repellency, dispersibility and dispersion stability in the oily components, and feel of the cosmetic powder material can be improved.

[0052] The preferred mixing ratio of fatty acids to acylated amino acids for forming complex metal soaps is 1:1 to 6:1 by mass. By setting the mixing ratio of fatty acids to acylated amino acids within this range, the water repellency, dispersibility and dispersion stability in oily components, and feel of the cosmetic powder material can be improved.

[0053] <Other ingredients> The cosmetic powder material of the present invention may also contain components other than cosmetic powders and complex metal soaps.

[0054] [Method for manufacturing powder materials for cosmetics] The cosmetic powder material of the present invention can be manufactured by the wet or dry processes described below.

[0055] <Wet processing> In a wet process, for example, powder materials for cosmetics can be manufactured by carrying out the following preparation, dispersion, and precipitation steps.

[0056] (preparation process) In the preparation step, fatty acids, acylated amino acids, and, if necessary, an alkaline monovalent metal salt such as sodium hydroxide are added to water that has been heated as needed (for example, heated to 80°C or higher), and the mixture is mixed using a conventionally known mixing apparatus to obtain an aqueous solution in which fatty acids and acylated amino acids are dissolved in water (i.e., an aqueous solution containing fatty acids and acylated amino acids) as a mixture.

[0057] (Dispersion process) In the dispersion step, cosmetic powder is added to the above mixture and dispersed using a conventionally known dispersion apparatus to obtain a dispersion.

[0058] (Precipitation process) In the precipitation step, an aqueous solution containing divalent or higher metal ions is added to the dispersion, and the mixture is mixed using a conventionally known mixing apparatus to precipitate a complex metal salt on the surface of the cosmetic powder. In the precipitated complex metal soap, fatty acids and acylated amino acids simultaneously form salts with divalent or higher metal ions. Through this precipitation, the cosmetic powder is surface-treated with the complex metal soap. The surface-treated material can be filtered, washed with water, and heat-treated to obtain a cosmetic powder material.

[0059] <Dry treatment> In dry processing, for example, powder materials for cosmetics can be manufactured by carrying out the following preparation, precipitation, and stirring / mixing steps.

[0060] (preparation process) In the preparation step, an aqueous solution (i.e., an aqueous solution containing fatty acids and acylated amino acids) is obtained as a mixture by dissolving fatty acids and acylated amino acids in water, in the same manner as in the preparation step for the wet treatment described above.

[0061] (Precipitation process) In the precipitation process, an aqueous solution containing divalent or higher metal ions is added to the above mixture, and the mixture is mixed using a conventionally known mixing apparatus to precipitate a complex metal salt. In the precipitated complex metal soap, fatty acids and acylated amino acids simultaneously form salts with divalent or higher metal ions. The precipitate is filtered, washed with water, and heat-dried to obtain a precipitate for use as a surface treatment agent.

[0062] (stirring and mixing process) In the stirring and mixing process, the cosmetic powder and the precipitate are stirred and mixed using a conventionally known stirring and mixing device such as a high-speed fluid mixer, and then heat-treated and pulverized to obtain a cosmetic powder material in which the surface of the cosmetic powder is coated with precipitate.

[0063] [Cosmetics] The cosmetic composition of the present invention is formulated with the above-mentioned cosmetic powder material. The amount of cosmetic powder material is not particularly limited, but is preferably 1 to 95% by mass. By incorporating the above-mentioned cosmetic powder material into the cosmetic composition, a product with excellent water repellency and oil dispersion properties is obtained.

[0064] The cosmetic composition of the present invention may be either an oil-in-water (O / W) emulsion or a water-in-oil (W / O) emulsion, but the water-in-oil (W / O) emulsion is preferred.

[0065] Furthermore, the cosmetic composition of the present invention may contain ingredients commonly used in cosmetics, such as powders other than cosmetic powder materials (powder materials), surfactants, oils, gelling agents, polymers, beauty ingredients, moisturizers, pigments, preservatives, fragrances, etc., to the extent that they do not impair the effects of the present invention. [Examples]

[0066] <Powdered materials for cosmetics> Powder materials for cosmetics of the present invention (Examples 1-4) were prepared based on the formulations shown in Table 1 below, and subjected to water repellency tests, oil dispersion tests, formulation dispersion stability tests, and sensory tests. For comparison, powder materials for cosmetics outside the scope of the present invention (Comparative Examples 1-4) were also prepared based on the formulations shown in Table 1 below, and similar tests were performed.

[0067] [Example 1] Production of cosmetic powder materials by wet processing To 4000g of water heated to 85°C, 6.7g of sodium hydroxide, 40g of stearic acid (Lunaq S-90V, manufactured by Kao Corporation) as a fatty acid, and 33.7g of an aqueous solution of dilauroyl glutamate lysine sodium, a 2-chain, 3-hydrophilic gemini-type acylated amino acid (Pellicea L-30, manufactured by Asahi Kasei Finechem Co., Ltd.) as an acylated amino acid were added and mixed. Next, 1000g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) was added and dispersed until uniform. Then, 710g of a 10% by mass aqueous solution of magnesium chloride was added and mixed to precipitate a complex magnesium soap of stearic acid and dilauroyl glutamate lysine on the surface of the spherical cellulose powder as a cosmetic powder. After filtering the obtained slurry, it was washed with water and heat-dried to obtain the cosmetic powder material of Example 1, in which the spherical cellulose powder was surface-treated with the complex magnesium soap.

[0068] [Example 2] Production of cosmetic powder materials by dry processing To 1100g of water heated to 85°C, 4.26g of sodium hydroxide, 15g of stearic acid (Lunaq S-90V, manufactured by Kao Corporation) as a fatty acid, and 25.9g of an aqueous solution of dilauroyl glutamate lysine sodium, a gemini-type acylated amino acid with two chains and three hydrophilic groups (Pellicea L-30, manufactured by Asahi Kasei Finechem Co., Ltd.) were added and mixed. Next, 165g of a 10% by mass aqueous solution of magnesium chloride was added and mixed, and the mixture was filtered, washed with water, and heat-treated to obtain a complex magnesium soap precipitate of stearic acid and dilauroyl glutamate lysine. 3.0 g of the obtained composite magnesium soap and 97.0 g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) as a cosmetic powder were stirred and mixed in a high-speed fluid mixer (Super Mixer Piccolo, manufactured by Kawata Co., Ltd.), then heat-treated, and subsequently pulverized to obtain the cosmetic powder material of Example 2, in which the spherical cellulose powder was surface-treated with composite magnesium soap.

[0069] [Example 3] Production of cosmetic powder materials by wet processing To 4000g of water heated to 85℃, 6.7g of sodium hydroxide, 40g of stearic acid (Lunaq S-90V, manufactured by Kao Corporation) as a fatty acid, and 33.7g of an aqueous solution of dilauroyl glutamate lysine sodium, a gemini-type acylated amino acid with two chains and three hydrophilic groups (Pellicea L-30, manufactured by Asahi Kasei Finechem Co., Ltd.) were added and mixed. Next, 1000g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) was added as a cosmetic powder and dispersed until uniform. Then, 710g of a 10% by mass aqueous solution of aluminum chloride was added and mixed, causing a complex aluminum soap of stearic acid and dilauroyl glutamate lysine to precipitate on the surface of the spherical cellulose powder as a cosmetic powder. After filtering the obtained slurry, it was washed with water and heat-dried to obtain the cosmetic powder material of Example 3, which consists of spherical cellulose powder surface-treated with a composite aluminum soap.

[0070] [Example 4] Production of cosmetic powder materials by wet processing To 4000g of water heated to 85℃, 6.7g of sodium hydroxide, 40g of myristic acid (Lunaq MY-98, manufactured by Kao Corporation) as a fatty acid, and 33.7g of an aqueous solution of dilauroyl glutamate lysine sodium, a gemini-type acylated amino acid with two chains and three hydrophilic groups (Pellicea L-30, manufactured by Asahi Kasei Finechem Co., Ltd.) were added and mixed. Next, 1000g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) was added as a cosmetic powder and dispersed until uniform. Then, 710g of a 10% by mass zinc chloride aqueous solution was added and mixed, causing a complex zinc soap of myristic acid and dilauroyl glutamate lysine to precipitate on the surface of the spherical cellulose powder as a cosmetic powder. After filtering the obtained slurry, it was washed with water and heat-dried to obtain the cosmetic powder material of Example 4, which consists of spherical cellulose powder surface-treated with a complex zinc soap.

[0071] [Comparative Example 1] Production of cosmetic powder materials by wet processing 4000g of water heated to 85°C was mixed with 1.7g of sodium hydroxide and 10g of stearic acid (Lunaq S-90V, manufactured by Kao Corporation) as a fatty acid. Next, 1000g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) was added as a cosmetic powder and dispersed until uniform. Then, 177.5g of a 10% by mass aqueous solution of magnesium chloride was added and mixed to precipitate magnesium stearate soap on the surface of the spherical cellulose powder. After filtering the obtained slurry, it was washed with water and heat-dried to obtain the cosmetic powder material of Comparative Example 1, in which spherical cellulose powder was surface-treated with magnesium stearate soap.

[0072] [Comparative Example 2] Production of cosmetic powder materials by dry process 1100g of water heated to 85°C was mixed with 4.26g of sodium hydroxide and 15g of stearic acid (Lunaq S-90V, manufactured by Kao Corporation) as a fatty acid. Then, 165g of a 10% by mass aqueous solution of magnesium chloride was added and mixed, followed by filtration, washing with water, and heat treatment to obtain magnesium stearate soap as a precipitate. 10.0g of the obtained magnesium stearate soap and 90.0g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) as a cosmetic powder were stirred and mixed using a high-speed fluid mixer (Super Mixer Piccolo, manufactured by Kawata Co., Ltd.), then heat-treated, and subsequently pulverized to obtain a cosmetic powder material of Comparative Example 2, in which the spherical cellulose powder was surface-treated with magnesium stearate soap.

[0073] [Comparative Example 3] Production of cosmetic powder materials by dry processing 400 g of water was mixed with 100 g of an aqueous solution of dilauroyl glutamate lysine sodium (Pellicea L-30, manufactured by Asahi Kasei Finechem Co., Ltd.), which is the sodium salt of a two-chain, three-hydrophilic gemini-type acylated amino acid. Next, 276.6 g of a 10% by mass aqueous solution of aluminum chloride was added and mixed, then filtered, washed with water, and heat-treated to obtain dilauroyl glutamate lysine aluminum soap as a precipitate. 5.0 g of the obtained dilauroyl glutamate lysine aluminum soap and 95.0 g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) as a cosmetic powder were stirred and mixed in a high-speed fluid mixer (Super Mixer Piccolo, manufactured by Kawata Co., Ltd.), then heat-treated, and subsequently pulverized to obtain a cosmetic powder material of Comparative Example 3, in which the spherical cellulose powder was surface-treated with dilauroyl glutamate lysine aluminum soap.

[0074] [Comparative Example 4] Production of cosmetic powder materials by dry processing To 1100g of water heated to 85°C, 4.26g of sodium hydroxide and 15g of stearic acid (Lunaq S-90V, manufactured by Kao Corporation) as a fatty acid were added and mixed. Next, 165g of a 10% by mass magnesium chloride aqueous solution was added and mixed, followed by filtration, washing with water, and heat treatment to obtain magnesium stearate soap as a precipitate. To 400g of water, 100g of a dilauroyl glutamate lysine sodium aqueous solution (Pellicea L-30, manufactured by Asahi Kasei Finechem Co., Ltd.), which is the sodium salt of a two-chain, three-hydrophilic gemini-type acylated amino acid, was added and mixed. Next, 276.6g of a 10% by mass aluminum chloride aqueous solution was added and mixed, followed by filtration, washing with water, and heat treatment to obtain dilauroyl glutamate lysine aluminum soap as a precipitate. Comparative Example 4, a cosmetic powder material, was obtained by simultaneously surface-treating spherical cellulose powder with magnesium stearate soap and dilauroyl glutamate lysine aluminum soap using a high-speed fluid mixer (Super Mixer Piccolo, manufactured by Kawata Co., Ltd.) by mixing 9.0 g of the obtained magnesium stearate soap, 1.0 g of dilauroyl glutamate lysine aluminum soap, and 90.0 g of spherical cellulose powder (CELLULOBEADS D-5, manufactured by Daito Chemical Industries, Ltd.) in a high-speed fluid mixer (Super Mixer Piccolo, manufactured by Kawata Co., Ltd.), then heat-treating the mixture, and subsequently grinding it.

[0075] The cosmetic powder materials obtained as described above were subjected to the following tests: water repellency test, oil dispersion test, formulation dispersion stability test, and tactile sensory test. The results are shown in Tables 1 and 2.

[0076] [Water repellency test] 50 mL of water was placed in a 50 mL beaker, and 0.1 g of cosmetic powder material was placed on the surface of the water. After approximately 1 minute, the appearance was checked. If the cosmetic powder material remained floating on the surface of the water, it was judged to have "water repellency." If the cosmetic powder material sank in the water, it was judged to have "no water repellency."

[0077] [Dispersibility test in the oil phase (dispersibility in oil)] Twelve g of dodecane and one g of a W / O surfactant (MAKIBASE SEB, manufactured by Daito Chemical Industries, Ltd.) that enables W / O emulsification were mixed in a 50 mL centrifuge tube. Then, two g of cosmetic powder material was added and further mixed to disperse the mixture. After dispersion, ten g of deionized water was added and further mixed to emulsify the mixture and prepare an oil-in-water emulsion. To distinguish the cosmetic powder material from the emulsion droplets, the deionized water was colored by adding Blue No. 1 to a concentration of 0.1% by mass. The emulsion state of the obtained emulsion was evaluated according to the following criteria by visual observation of appearance, visual observation of viscosity, and microscopic observation. A: The emulsion has a uniform appearance and low viscosity, and the cosmetic powder material is localized in the oil phase or at the interface between the oil phase and the aqueous phase, but not in the aqueous phase (excellent). B: The emulsion has a uniform appearance and low viscosity, and the cosmetic powder material is localized in the oil phase or at the interface between the oil phase and the aqueous phase, with a portion localized in the aqueous phase (good). C: The emulsion has an uneven appearance, is thickened or gelled, and the cosmetic powder material is localized in the aqueous phase (slightly poor). D: The emulsion has an uneven appearance, the cosmetic powder material has aggregated and formed clumps, and there are detached precipitates (surface treatment agent) in the oil phase (defective). Furthermore, ratings A and B indicate that both exhibit excellent water repellency and oil dispersibility, with rating A being superior to rating B. Ratings C and D indicate that at least one of water repellency and oil dispersibility is inferior, with rating D being inferior to rating C.

[0078] [Dispersion stability (formulation dispersion stability) test in W / O emulsion product formulations] An oil phase was prepared by mixing 4.5% by mass of a complex W / O emulsifier consisting of organically modified clay minerals and polyglycerin fatty acid esters (NIKKOMULESE WO-NS, manufactured by Nikko Chemicals Co., Ltd.), 1% by mass of sorbitan sesquiisostearate (Cosmoll 182V, manufactured by Nisshin Oillio Co., Ltd.), 12.6% by mass of an alkane with 9 to 12 carbon atoms (MAKIGREEN D10, manufactured by Daito Chemical Industries, Ltd.), 5.5% by mass of (caprylic / capric acid) coconut alkyl (MIGLYOL Coco 810, manufactured by Watahan Trading Co., Ltd.), and 0.5% by mass of ethylhexylglycerin (GLYMOIST EH, manufactured by NOF Corporation). 6% by mass of cosmetic powder material was mixed into the oil phase and dispersed. Next, a water-free (W / O) cream was prepared by thoroughly stirring and mixing 57.1% by mass of deionized water, 3% by mass of glycerin, 5% by mass of propanediol, 0.5% by mass of sodium chloride, 4.0% by mass of pullulan, and 0.3% by mass of a preservative. This aqueous phase was then added to the oil phase and mixed to prepare a W / O cream. The obtained W / O cream (W / O emulsified product) was examined under a microscope to confirm its dispersion state immediately after preparation and two weeks after preparation. If the cosmetic powder material is "uniformly dispersed" both immediately after preparation and two weeks after preparation, it is evaluated as having excellent dispersion stability. If the cosmetic powder material is "aggregated" both immediately after preparation and two weeks after preparation, it is evaluated as having poor dispersion stability.

[0079] [Sensory evaluation of tactile sensations] The W / O cream prepared using the "Formulation Dispersion Stability Test" was subjected to a sensory evaluation by five expert panelists to assess its texture. The test items were "spreadability" and "moisture," and the evaluation criteria were set on a 5-point scale from 1 to 5, as shown below, with higher scores indicating a better texture. The average of the evaluation scores from each panelist for each item was used as the evaluation result.

[0080] (Good stretchability) 5 points: Excellent 4 points: Good 3 points: normal 2 points: Slightly poor 1 point: Defective

[0081] (Moist feeling) 5 points: Excellent 4 points: Good 3 points: normal 2 points: Slightly poor 1 point: Defective

[0082] [Table 1]

[0083] [Table 2]

[0084] Table 1 shows that the cosmetic powder materials of Examples 1-4, in which cosmetic powders were surface-treated with composite metal soaps, exhibited better water repellency and oil dispersion compared to the cosmetic powder materials of Comparative Examples 1-3, in which cosmetic powders were surface-treated with various metal soaps and divalent or higher metal salts individually. Furthermore, compared to the case where cosmetic powders were surface-treated separately with fatty acid metal soaps and divalent or higher metal salts of acylated amino acids, as in Comparative Example 4, the surface treatment with composite metal soaps that simultaneously precipitated fatty acids and acylated amino acids, as in Examples 1-4, showed better oil dispersion.

[0085] Table 2 shows that the cosmetic powder materials of Examples 1-4 exhibited excellent dispersion stability over time (oil-based dispersion stability) in W / O cream formulations. In terms of feel, the cosmetic powder materials of Examples 1-4 were found to be excellent in both spreadability and moisturizing properties. In contrast, the cosmetic powder materials of Comparative Examples 1-4 exhibited aggregation from the preparation process in W / O cream formulations, resulting in poor dispersibility rather than dispersion stability. They were also found to be inferior in both spreadability and moisturizing properties. [Industrial applicability]

[0086] The cosmetic powder material of the present invention is suitable for use in cosmetics, and is particularly suitable for use in makeup cosmetics such as foundations, eyeshadows, and blushes, as well as sunscreens, lotions, creams, and other basic cosmetics.

Claims

1. A cosmetic powder material obtained by surface-treating cosmetic powder with a complex metal soap of fatty acids and acylated amino acids.

2. The powder material for cosmetics according to claim 1, wherein the fatty acid is a fatty acid having 12 to 22 carbon atoms.

3. The cosmetic powder material according to claim 1, wherein the fatty acid is myristic acid and / or stearic acid.

4. The powder material for cosmetics according to claim 1, wherein the acylated amino acid is a two-chain, three-hydrophilic gemini-type acylated amino acid shown in formula (1) below. 【Chemistry 1】 In formula (1) above, R １ and R ２ Each of these is an alkyl group having 8 to 14 carbon atoms, X is a hydrogen atom or a sodium atom, m is an integer from 1 to 3, and n is an integer from 1 to 3.

5. The powder material for cosmetics according to claim 1, wherein the composite metal soap is at least one selected from the group consisting of magnesium salts, calcium salts, aluminum salts, and zinc salts.

6. The powder material for cosmetics according to claim 1, wherein the composite metal soap is a precipitate obtained by adding at least one selected from magnesium ions, calcium ions, aluminum ions, and zinc ions to an aqueous solution containing the acylated amino acid and the fatty acid.

7. The cosmetic powder material according to claim 1, wherein the cosmetic powder is spherical cellulose.

8. The cosmetic powder material according to claim 1, wherein the content of the composite metal soap is 0.1 to 25.0% by mass relative to 100% by mass of the cosmetic powder.

9. A cosmetic powder material in which the surface of the cosmetic powder is coated with a complex metal soap of fatty acids and acylated amino acids.

10. A cosmetic composition comprising a powder material for cosmetics as described in any one of claims 1 to 9.

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