Method for producing solid powder cosmetic, and solid powder cosmetic

Abstract

This method for producing a solid powder cosmetic comprises: a step for preparing a slurry containing a cosmetic base material and a dispersion medium, the cosmetic base material containing a powder component and an oily component, and the dispersion medium containing water; and a step for filling a container with the slurry, removing the dispersion medium, and molding the slurry, the powder component comprising (A) at least one type of plate-like powder selected from the group consisting of (A1) plate-like powder comprising alumina single crystals and (A2) plate-like powder comprising alumina coated with a metal oxide, and (B) spherical powder, the cosmetic base material further contains (C) a water-soluble thickener, and the oily component contains (D) a water-holding oil agent.

Description

Technical Field

[0001] This invention relates to a method for manufacturing solid powder cosmetics and to solid powder cosmetics. Background Technology

[0002] Solid powder cosmetics, composed of powder and oil components, are used as makeup cosmetics such as blush, eyeshadow, foundation, and face powder. From a portability perspective, these cosmetics are often stored in compact containers. Such solid powder cosmetics are manufactured using either a dry method (mixing powder and oil components into a cosmetic base material, filling it into a container such as a metal tray and pressing it into shape) or a wet method (adding volatile organic solvents such as volatile hydrocarbon oils or volatile lower alcohols as a dispersion medium to the cosmetic base material, creating a slurry, filling it into a container, removing the dispersion medium, and then compressing it into shape).

[0003] Solid powder cosmetics prepared by wet processing tend to have a good user experience, with excellent spreadability during application. In recent years, considering the environment, wet processing methods using water as a solvent have also been studied (see, for example, Japanese Patent Application Publication No. 2010-37207). Summary of the Invention

[0004] However, compared to using volatile organic solvents, wet preparation methods using water tend to have difficulties in filling the powder slurry and an increased amount of dispersion medium. This can easily lead to surface cracks, internal voids, and gaps between the outer periphery and the container in the dried cosmetic. These defects are the main reasons for usability problems such as powder flying when using coating tools to wipe solid powder cosmetics, difficulty in obtaining the correct amount, and reduced impact resistance of solid powder cosmetics.

[0005] In the manufacturing method of solid powder cosmetics described in Patent Document 1, the impact resistance of the solid powder cosmetics is improved by using a slurry containing specific powder components, specific oil components, polyols, and specific surfactants in specific proportions. However, according to the inventors' research, it has been found that solid powder cosmetics containing polyols experience a significant decrease in hardness under high humidity conditions. Excessive decrease in hardness can lead to reduced drop strength and changes in the user experience. Therefore, in the aforementioned prior art, there is still room for improvement in the storage stability of solid powder cosmetics.

[0006] On the other hand, there are also requirements regarding the makeup finish for solid powder cosmetics. Specifically, for example, loose powder used in makeup application requires good spreadability when spread on the skin, as well as a dry feel, minimal fallout, easy skin-feeling, and a transparent finish. Regarding methods to improve spreadability, increasing the amount of spherical powders such as silica and nylon is known; however, this tends to reduce skin adhesion, and can easily lead to fallout when wiping with a brush or the aforementioned reduced impact resistance. Since the mainstream application method for loose powder is to apply it to the skin using a brush or similar tool, excellent usability, such as minimal fallout and easy application in appropriate amounts, is required.

[0007] The present invention was made in view of the above circumstances, and its object is to provide a solid powder cosmetic material with excellent usability (less powder fallout, easy to apply in appropriate amounts), excellent makeup effect (adhesion to the skin, transparent makeup), sufficient impact resistance and sufficient storage stability, and to provide a method for manufacturing such a solid powder cosmetic material by using a wet process with water.

[0008] The present invention provides the following methods for manufacturing solid powder cosmetics [1] to [8]. [1] A method for manufacturing a solid powder cosmetic includes a step of preparing a slurry containing a cosmetic substrate and a dispersion medium, wherein the cosmetic substrate contains a powder component and an oil component, and the dispersion medium contains water; and a step of filling the slurry into a container, removing the dispersion medium, and molding the slurry, wherein the powder component includes (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder composed of alumina single crystals and (A2) plate-shaped powder with metal oxides coated on the surface of alumina, and (B) spherical powder, wherein the cosmetic substrate further includes (C) a water-soluble thickener, and the oil component includes (D) a water-holding oil. [2] As described in [1], the method for manufacturing solid powder cosmetics, wherein the content of polyols in the cosmetic base material is less than 0.1% by mass based on the cosmetic base material. [3] The method for manufacturing a solid powder cosmetic as described in [1] or [2], wherein the content of the above-mentioned (D) component in the cosmetic base material is 50% by mass or less based on the total amount of the above-mentioned oily components. [4] A method for manufacturing a solid powder cosmetic as described in any of [1] to [3], wherein the above-mentioned component (C) comprises one or more thickeners selected from the group consisting of acrylic copolymers and clay minerals. [5] A solid powder cosmetic as described in any one of [1] to [3], wherein the above-mentioned component (C) comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymer and sodium acrylate grafted starch. [6] A method for manufacturing a solid powder cosmetic as described in any of [1] to [5], wherein the above-mentioned component (B) comprises spherical particles that have been surface-treated with a higher alcohol. [7] A method for manufacturing a solid powder cosmetic as described in any of [1] to [6], wherein the content of semi-solid oil in the cosmetic base material is 1 to 6% by mass, based on the total amount of the cosmetic base material. [8] As described in [2], the method for manufacturing solid powder cosmetics, wherein, The content of component (D) in the above-mentioned cosmetic base material is 50% by mass or less, based on the total amount of the above-mentioned oily components. The above-mentioned component (C) comprises at least one acrylic copolymer selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymer, and sodium acrylate grafted starch. Component (B) above contains spherical particles that have been surface-treated with higher alcohols. The semi-solid oil content in the above-mentioned cosmetic base material is 1 to 6% by mass, based on the total amount of the above-mentioned cosmetic base material.

[0009] The present invention also provides the following solid powder cosmetics [9] to

[16] . [9] A solid powder cosmetic containing a powder component and an oil component, wherein the powder component comprises (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder composed of alumina single crystals and (A2) plate-shaped powder with metal oxides coated on the surface of alumina, and (B) spherical powder, the solid powder cosmetic further comprising (C) a water-soluble thickener, and the oil component comprising (D) a water-retaining oil.

[10] As described in [9], the content of polyols in the solid powder cosmetic is less than 0.1% by mass, based on the solid powder cosmetic.

[11] As described in [9] or

[10] , the content of the above-mentioned (D) component in the above-mentioned solid powder cosmetic is 50% by mass or less based on the total amount of the above-mentioned oily components.

[12] A solid powder cosmetic as described in any of [9] to

[11] , wherein the above-mentioned component (C) contains one or more thickeners selected from the group consisting of acrylic copolymers and clay minerals.

[13] A solid powder cosmetic as described in any one of [9] to

[11] , wherein the above-mentioned component (C) comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymer and sodium acrylate grafted starch.

[14] A solid powder cosmetic as described in any of [9] to

[13] , wherein the above-mentioned component (B) comprises spherical particles that have been surface-treated with higher alcohols.

[15] As described in any of [9] to

[14] , the content of semi-solid oil in the solid powder cosmetic is 1 to 6% by mass, based on the total amount of the solid powder cosmetic.

[16] As described in

[10] , the content of component (D) in the solid powder cosmetic is 50% by mass or less, based on the total amount of the oily components. The above-mentioned component (C) comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymer, and sodium acrylate grafted starch. Component (B) above contains spherical particles that have been surface-treated with higher alcohols. The semi-solid oil content in the above-mentioned solid powder cosmetics is 1-6% by mass, based on the total amount of the above-mentioned solid powder cosmetics.

[0010] According to the present invention, a solid powder cosmetic material with excellent usability (less powder fallout, easy to apply in appropriate amounts), excellent makeup effect (adhesion to the skin, transparent makeup), sufficient impact resistance and sufficient storage stability can be provided. Furthermore, a method for manufacturing such a solid powder cosmetic material is provided, which can be obtained by using a wet process with water. Detailed Implementation

[0011] [Manufacturing method of solid powder cosmetics] The method for manufacturing solid powder cosmetics according to this embodiment includes: step A, preparing a powder paste containing a cosmetic base material comprising powder components and oily components and a dispersion medium comprising water; and step B, filling the powder paste into a container, removing the dispersion medium, and molding the paste.

[0012] In the above cosmetic base material, the powder component includes (A) at least one plate-shaped powder (sometimes also called (A) component) selected from the group consisting of (A1) plate-shaped powder composed of alumina single crystals (sometimes also called (A1) component) and (A2) plate-shaped powder with metal oxides coated on the surface of alumina (sometimes also called (A2) component), and (B) spherical powder (sometimes also called (B) component), the cosmetic base material further includes (C) water-soluble thickener (sometimes also called (C) component), and the oily component includes (D) water-retaining oil (sometimes also called (D) component).

[0013] According to the manufacturing method of the solid powder cosmetic according to this embodiment, by having the above-described structure, a solid powder cosmetic with excellent usability (less powder fallout, easy to use in appropriate amounts), excellent makeup finish (adhesion to the skin, transparent makeup), sufficient impact resistance, and sufficient storage stability can be obtained.

[0014] (Process A) First, the components of the cosmetic base material contained in the powder will be explained.

[0015] <Powder ingredients> In this embodiment, the powder composition includes component (A) and component (B).

[0016] For ingredient (A), it can be used without special restrictions as long as it is an ingredient used in cosmetics.

[0017] For ingredients (A1), for example, commercially available products such as "RonaFlair (registered trademark) White Sapphire" (manufactured by Melk Co., Ltd., product name) can be used.

[0018] As component (A2), examples include alumina matrix pearlescent agents in which metal oxides such as titanium oxide, tin oxide, and iron oxide are coated on the surface of plate-shaped alumina. For example, commercially available products such as "RonaFlair Golden Lights" (manufactured by Melk Co., Ltd., product name) and "Mirinae series" (manufactured by CQV Co., Ltd., product name) can be used.

[0019] From the perspectives of skin adhesion, a transparent makeup finish, and suppression of fallout, the average particle size of component (A) can be 2–100 μm, 4–80 μm, or 5–45 μm. The average particle size of component (A1) can be 2–50 μm, 4–40 μm, or 5–30 μm. The average particle size of component (A2) can be 5–100 μm, 8–80 μm, or 15–45 μm. It should be noted that in this specification, average particle size refers to the D50 value based on the volume distribution measured using a laser diffractometer.

[0020] For ingredient (A), one type can be used alone or in combination of two or more types.

[0021] From the perspective of improving adhesion to the skin and the transparency of the makeup, the content of component (A) in the cosmetic base material can be 0.1-75% by mass, 5-60% by mass, or 15-45% by mass, based on the total amount of the cosmetic base material.

[0022] From the perspective of improving adhesion to the skin and the transparency of the makeup, the cosmetic base material may contain component (A1) as component (A).

[0023] When the cosmetic base material contains (A1) component, from the viewpoint of improving the transparency and luster of the makeup, the content of (A1) component in the cosmetic base material, based on the total amount of (A) component, can be 0.1% by mass or more, 10% by mass or more, 25% by mass or more, 40% by mass or more, 75% by mass or more, 80% by mass or more, or 100% by mass.

[0024] When the cosmetic base material contains component (A2), from the viewpoint of improving the transparency and pearlescent effect of the makeup, the content of component (A2) in the cosmetic base material can be 15% by mass or more, 25% by mass or more, 55% by mass or more, or 75% by mass or more, based on the total amount of component (A).

[0025] For ingredient (B), any ingredient used in cosmetics can be used without special restrictions.

[0026] As component (B), examples include inorganic powders such as silica, calcium carbonate, magnesium carbonate, and barium sulfate; and organic powders such as nylon powder, polymethyl methacrylate powder, acrylonitrile-methacrylic acid copolymer powder, vinylidene chloride-methacrylic acid copolymer, polyethylene powder, polystyrene powder, organopolysiloxane elastomer powder, polymethylsilsesquioxane powder, polyurethane powder, wool powder, silk powder, cellulose powder, linear starch powder, N-acyl lysine powder, and starch-derived powder.

[0027] For ingredient (B), a surface treatment may be performed. As a surface treatment, any surface treatment used in cosmetics may be used without particular restrictions. Examples include surface treatments using metallic soaps, higher alcohols, higher fatty acids, oils, waxes, silicone compounds, fluorinated compounds, surfactants, dextrin fatty acid esters, etc.

[0028] From the viewpoint of suppressing powder fallout and improving adhesion to the skin, as component (B), the cosmetic base material may contain spherical particles that have been surface-treated with higher alcohols.

[0029] Higher alcohols can be alcohols with 12 to 18 carbon atoms, or saturated aliphatic alcohols with 12 to 18 carbon atoms. Examples of higher alcohols include cetyl alcohol and stearyl alcohol.

[0030] From the viewpoint of good skin spreadability and easy appropriate application, the average particle size of component (B) can be 2-50 μm, 4-30 μm, or 5-15 μm.

[0031] For component (B), one type can be used alone or in combination of two or more types.

[0032] From the viewpoint of good skin spreadability and easy application, the content of component (B) in the cosmetic base material can be more than 1% by mass, more than 3% by mass, more than 5% by mass, more than 10% by mass, more than 12% by mass, or more than 15% by mass, based on the total amount of the cosmetic base material. From the viewpoint of suppressing powder fallout and impact resistance, it can also be less than 40% by mass, less than 30% by mass, less than 25% by mass, or less than 20% by mass, based on the total amount of the cosmetic base material.

[0033] From the perspective of balancing the suppression of fallout, adhesion to the skin (especially skin affinity), and transparency of the makeup, the total content of component (A) and component (B) in the cosmetic base material can be 15-75% by mass, 25-55% by mass, or 30-50% by mass, based on the total amount of the cosmetic base material.

[0034] From the perspective of balancing the suppression of fallout, adhesion to the skin (especially skin affinity), and the transparency of the makeup, the ratio of the content of component (A) to the content of component (B) in the cosmetic base material [(A) / (B)] can be 0.1 to 20, 0.3 to 15, or 0.5 to 10.

[0035] From the viewpoints of easy adjustment of the amount of product applied to the coating tool when using a coating tool, easy application of the appropriate amount (easy to apply), transparency of the makeup, and good spreadability, the cosmetic base material may contain inorganic powders as component (B). The inorganic powders preferably include spherical silica.

[0036] From the perspective of balancing and improving ease of application, adhesion to the skin, and good spreadability, the content of spherical silica in the cosmetic base material can be 0.01 to 50% by mass, 1 to 30% by mass, 3 to 25% by mass, or 4 to 20% by mass, based on the total amount of the cosmetic base material.

[0037] From the perspective of balancing the suppression of fallout, ease of application, transparency of the makeup, good spreadability and formability, the total content of component (A) and spherical silica in the cosmetic base material can be 15-75% by mass, 25-55% by mass, or 30-50% by mass, based on the total amount of the cosmetic base material.

[0038] From the viewpoint of suppressing powder fallout and improving adhesion to the skin, ingredient (B) may contain spherical silica that has been surface-treated with higher alcohols (higher alcohol-treated spherical silica).

[0039] From the perspective of balancing the suppression of fallout, ease of application, skin adhesion, transparency of makeup, good spreadability and formability, the content of high alcohol-treated spherical silica in cosmetic base materials can be 2-30% by mass, 3-20% by mass, or 4-16% by mass, based on the total amount of cosmetic base materials.

[0040] From the viewpoint of good extensibility, ease of use, and formability, component (B) may contain spherical calcium carbonate. From the viewpoint of balanced improvement in suppressing powder fallout, ease of use, good extensibility, and formability, the content of spherical calcium carbonate in the cosmetic base material, based on the total amount of the cosmetic base material, can be 0.1 to 10% by mass, 1 to 7% by mass, or 3 to 5% by mass.

[0041] From the perspective of balancing the suppression of fallout, ease of application, transparency of the makeup, good spreadability and formability, the total content of component (A) and spherical calcium carbonate in the cosmetic base material can be 1-50% by mass, 5-47% by mass, or 20-45% by mass, based on the total amount of the cosmetic base material.

[0042] The cosmetic base material of this embodiment may also include powder components other than component (A) and component (B) (sometimes referred to as other powder components). As for other powder components, there are no particular limitations as long as they are components commonly used in cosmetics; for example, extender powders, white pigments, and coloring pigments can be listed. The shape of other powder components is not particularly limited as long as they are not spherical; they may also have plate-like, needle-like, smoky, microparticle, pigment-grade particle size, porous, or non-porous particle structures.

[0043] Specifically, examples include extender pigments such as mica, synthetic mica, sericite, talc, kaolin, boron nitride, silicon carbide, barium sulfate, alumina, silicon dioxide, magnesium oxide, zirconium oxide, magnesium carbonate, calcium carbonate, chromium oxide, and magnesium aluminum hydroxide; white pigments such as titanium dioxide and zinc oxide; organic powders such as polyethylene powder, polystyrene powder, organopolysiloxane elastomer powder, polymethylsilsesquioxane powder, polyurethane powder, wool powder, silk powder, cellulose powder, and N-acyllysine powder; and composite powders such as micronized titanium dioxide coated with mica titanium, micronized titanium dioxide coated with nylon, barium sulfate coated with mica titanium, silicon dioxide containing titanium dioxide, silicon dioxide containing zinc oxide, and alumina coated with mica.

[0044] As coloring pigments, examples include inorganic coloring pigments such as iron oxide red, iron oxide yellow, iron oxide black, cobalt oxide, chromium oxide, ultramarine, iron blue, titanium oxide, and zinc oxide; organic coloring pigments such as red 228, red 226, blue 404, red 202, and yellow 4 aluminum lake; pearlescent pigments such as mica titanium, fish scale foil, bismuth oxychloride, and flake aluminum powder; and natural pigments such as carmine and safflower.

[0045] From a formability point of view, the cosmetic base material preferably includes at least one of calcium carbonate and magnesium carbonate having a shape other than spherical as other powder components. From a formability point of view, the total content of calcium carbonate and magnesium carbonate having a shape other than spherical in the cosmetic base material can be 1 to 10% by mass, 2 to 8% by mass, or 3 to 6% by mass, based on the total amount of the cosmetic base material.

[0046] When the cosmetic base material contains spherical calcium carbonate or magnesium carbonate, and calcium carbonate or magnesium carbonate with a shape other than spherical, from the viewpoint of moldability, the total content of calcium carbonate and magnesium carbonate in the cosmetic base material can be 1 to 10% by mass, 2 to 8% by mass, or 3 to 6% by mass, based on the total amount of the cosmetic base material.

[0047] Cosmetic base materials may contain powder components with ultraviolet (UV) scattering effects (also known as UV scattering agents) as other powder components, or they may not contain UV scattering agents. Examples of UV scattering agents include particulate titanium dioxide and zinc oxide. The content of UV scattering agents in cosmetic base materials is based on the total amount of cosmetic base materials and can be 1-40% by mass, 3-30% by mass, or 5-25% by mass.

[0048] Other powder components can also be surface-treated components. As a surface treatment, any surface treatment used in cosmetics can be used without particular restrictions. Examples include surface treatments using metallic soaps, higher fatty acids, oils, waxes, silicone compounds, fluorinated compounds, surfactants, dextrin fatty acid esters, etc.

[0049] From the perspective of good ductility, the content of powder components in cosmetic base material can be 60-96% by mass, 65-93% by mass, or 70-90% by mass, based on the total amount of cosmetic base material.

[0050] Thickener In this embodiment, the cosmetic base material further comprises (C) a water-soluble thickener (sometimes also referred to as component (C)).

[0051] (C) The ingredients are additives that increase the viscosity of liquids by dissolving in water. As long as they are ingredients used in cosmetics, they can be used without special restrictions.

[0052] From the viewpoints of suppressing fallout, skin adhesion, makeup transparency, and impact resistance, ingredient (C) may contain one or more thickeners selected from the group consisting of acrylic copolymers and clay minerals.

[0053] When an acrylic copolymer is included as component (C) in the cosmetic base material, the suppression of powder fallout, drop strength, and skin adhesion can be improved to a higher level. This is because the acrylic copolymer improves the dispersibility of the powder in the slurry, thereby enhancing its filling properties, and also acts as a binder in the molded body (solid powder cosmetic) after the dispersion medium has been removed. Examples of acrylic copolymers include (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymers, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymers, and sodium acrylate grafted starch.

[0054] When the cosmetic base material contains clay minerals as component (C), the suppression of fly powder and drop strength can be improved to a higher level. This is because clay minerals improve the dispersibility of the powder in the slurry, thereby enhancing the slurry's filler properties, and also act as a binder in the molded body (solid powder cosmetic) after the dispersion medium has been removed. Examples of clay minerals include bentonite, magnesium aluminum silicate, and lithium montmorillonite.

[0055] From the perspective of balancing the suppression of fallout, ease of application, adhesion to the skin, transparency of the makeup, and impact resistance, the content of component (C) in the cosmetic base material can be 0.01 to 10% by mass or 0.05 to 5% by mass, based on the total amount of the cosmetic base material.

[0056] When the cosmetic base material contains an acrylic copolymer as component (C), from the viewpoint of comprehensively improving the suppression of powder fallout, ease of application, skin adhesion, transparency of makeup, and impact resistance, the content of the acrylic copolymer, based on the total amount of the cosmetic base material, can be 0.01 to 0.5% by mass, 0.05 to 0.4% by mass, or 0.10 to 0.25% by mass.

[0057] When the cosmetic base material contains clay minerals as component (C), from the viewpoint of comprehensively improving the suppression of fallout, ease of application, adhesion to the skin, transparency of the makeup, and impact resistance, the content of clay minerals can be 1 to 10% by mass, 2 to 8% by mass, or 3 to 6% by mass, based on the total amount of the cosmetic base material.

[0058] <Oily ingredients>

[0059] In this embodiment, the oily component includes (D) water-retaining oil (sometimes also referred to as component (D)). A water-retaining oil is an oil having a water-retaining capacity of more than 100% of its own weight.

[0060] Component (D) can be an oil that has a water-holding capacity of 100% or more at room temperature (25°C). Furthermore, component (D) can be a liquid oil or a semi-solid oil, preferably a semi-solid oil.

[0061] It should be noted that in this specification, liquid oil refers to oil that is liquid at 25°C, and semi-solid oil refers to oil that is pasty at 25°C.

[0062] As component (D), examples include liquid oils such as phytosterol / isostearyl di-linoleate and C10-30 acid cholesterol / lanosterol mixed ester; and semi-solid oils such as phytosterol / isostearyl / cetyl alcohol / stearyl / behenol di-linoleate, hydrogenated castor oil isostearate, bis-behenol / isostearyl / phytosterol di-linoleate, di-pentaerythritol hexahydroxystearate / hexastearate / hexapineate, and di-pentaerythritol tetrahydroxystearate / tetraisostearate. From the viewpoint of improving usability, semi-solid oils containing phytosterol derivatives such as phytosterol / isostearyl / cetyl alcohol / stearyl / behenol di-linoleate and bis-behenol / isostearyl / phytosterol di-linoleate are preferred.

[0063] From the perspective of skin adhesion, the content of component (D) in the cosmetic base material can be 1-10% by mass, 2-8% by mass, or 3-6% by mass, based on the total amount of the cosmetic base material.

[0064] From the viewpoints of ease of use and formability, the content of component (D) in the cosmetic base material, based on the total amount of oily components, can be 50% by mass or less, 40% by mass or less, 35% by mass or less, or 33% by mass or less. Furthermore, from the viewpoints of skin adhesion and impact resistance, the above content can be 1% by mass or more, 10% by mass or more, or 25% by mass or more.

[0065] The cosmetic base material of this embodiment may also contain oily components other than component (D) (sometimes referred to as other oily components). As for other oily components, there are no particular limitations as long as they are components commonly used in cosmetics, and solid oils, semi-solid oils, and liquid oils can be used.

[0066] Examples of liquid oils (hereinafter also referred to as other liquid oils) include cetyl ethylhexanoate, ethylhexyl palmitate, triglycerides (ethylhexanoate), isotretinoate, isostearyl isostearate, neopentyl glycol di(ethylhexanoate), polyglycerol-2 isostearate, caprylic / capric triglyceride, neopentyl glycol didecanoate, and propylene glycol diisostearate. Esters such as diisostearate, trimethylolpropane tri(ethylhexanoate), octyldodecyl myristate, octyldodecyl stearyloxy stearate, diisostearyl malate, polyglycerol triisostearate, dipolypentaerythritol pentaisostearate, trimethylolpropane triisostearate, caprylic / capric triglyceride, etc.; hydrocarbon oils such as olefin oligomers, liquid paraffin, squalane, hydrogenated polyisobutylene, etc.; silicone oils such as polydimethylsiloxane; vegetable oils such as sunflower seed oil, jojoba seed oil, olive oil, castor oil, etc.; and higher alcohols such as isostearyl alcohol, octyldodecyl alcohol, and oleyl alcohol, etc.

[0067] From the perspective of balancing the suppression of powder fallout, easy applicability, and good spreadability, the content of other liquid oils in cosmetic base materials can be 50-95% by mass, 60-80% by mass, or 65-75% by mass, based on the total amount of oily components.

[0068] Other liquid oils can be low-viscosity liquid oils with a viscosity of less than 50 mPa·s at 25°C, medium-viscosity liquid oils with a viscosity of 50 mPa·s to 1000 mPa·s at 25°C, high-viscosity liquid oils with a viscosity of more than 1000 mPa·s at 25°C, or combinations thereof. When the cosmetic base material contains other liquid oils, from the viewpoint of good spreadability and a natural makeup finish, it is preferable to include low-viscosity liquid oils, or low-viscosity liquid oils and medium-viscosity liquid oils.

[0069] It should be noted that, in this specification, the viscosity of liquid oil at 25°C refers to the value obtained by measuring a sample at 25°C using a Brookfield viscometer (BM type) under the following conditions. It should be noted that the measurement time is set to 1 minute. 5~50mPa·s: BM type, BL adapter, speed 12rpm 50~500mPa·s: BM type, rotor No.1, speed 12rpm 250~2500mPa·s: BM type, rotor No.2, speed 12rpm 1000~10000mPa·s: BM type, rotor No.3, speed 12rpm 5000~50000 mPa·s: BM type, rotor No.4, speed 12 rpm

[0070] From the perspective of balancing and improving ease of use, skin adhesion, and good spreadability, the content of the above-mentioned low-viscosity liquid oil, based on the total amount of oily components, can be 20-95% by mass, 35-80% by mass, or 45-75% by mass.

[0071] From the perspective of balancing and improving ease of use, skin adhesion, and good spreadability, the content of the above-mentioned low-viscosity liquid oil relative to 100 parts by weight of component (D) can be 50 to 300 parts by weight, 70 to 250 parts by weight, or 90 to 200 parts by weight.

[0072] From the perspective of balancing and improving ease of use, adhesion to the skin, and good spreadability, the content of the above-mentioned medium viscosity liquid oil, based on the total amount of oily components, can be 0.1-80% by mass, 5-70% by mass, or 10-60% by mass.

[0073] From the viewpoint of balancing and improving ease of application, adhesion to the skin, and good spreadability, the content of the medium-viscosity liquid oil relative to 100 parts by weight of component (D) can be 0.1 to 200 parts by weight, 1 to 150 parts by weight, or 10 to 100 parts by weight. The cosmetic base material of this embodiment may not contain medium-viscosity liquid oil as another oily component.

[0074] From the viewpoint of balancing and improving ease of application, skin adhesion, and good spreadability, the content of the aforementioned high-viscosity liquid oil, based on the total amount of oily components, can be 0.1–80% by mass, 0.5–70% by mass, or 1–60% by mass. The cosmetic base material of this embodiment may not contain high-viscosity liquid oil as other oily components.

[0075] From the perspective of balancing and improving ease of use, adhesion to the skin, and good spreadability, the contents of the above-mentioned low-viscosity liquid oil and medium-viscosity liquid oil, based on the total amount of other oily components, can be 50-100% by mass and 0-50% by mass, respectively; 60-80% by mass and 20-40% by mass, respectively; or 65-75% by mass and 25-35% by mass, respectively.

[0076] Other liquid oils can be non-polar, polar, or a combination thereof. When the cosmetic base contains other liquid oils, non-polar oils are preferred from the viewpoint of good spreadability and a natural finish. Examples of non-polar oils include cetyl ethylhexanoate, ethylhexyl palmitate, triglycerides (ethylhexanoate), isotretinoate, isostearyl isostearate, neopentyl glycol di(ethylhexanoate), caprylic / capric triglyceride, neopentyl glycol dicaprate, trimethylolpropane tri(ethylhexanoate), octyl dodecyl myristate, trimethylolpropane triisostearate, caprylic / capric triglyceride, etc.; hydrocarbon oils such as olefin oligomers, liquid paraffin, squalane, hydrogenated polyisobutylene, etc.; and silicone oils such as polydimethylsiloxane, etc.

[0077] From the perspective of balancing and improving good spreadability and natural makeup, the content of the above-mentioned non-polar oil, based on the total amount of oily components, can be 50-95% by mass, 60-80% by mass, or 65-75% by mass.

[0078] Examples of semi-solid oils include petrolatum, caprylic / capric / myristic / stearic acid triglycerides, sucrose hexaoleate / hexapalmitate / hexastearate, pentaerythritol rosinate, and cholesterol fatty acid esters.

[0079] From the viewpoint of improving adhesion to the skin and maintaining drop strength, the content of the aforementioned semi-solid oil, based on the total amount of oily components, can be 0.1 to 8.0% by mass, 0.5 to 7.0% by mass, or 1.0 to 5.0% by mass. The cosmetic base material of this embodiment may not contain the aforementioned semi-solid oil as other oily components.

[0080] Solid oils include, for example, hydrocarbons such as paraffin wax, microcrystalline wax, and polyethylene; plant-derived oils such as hardened castor oil (hydrogenated castor oil), hydrogenated jojoba oil, carnauba wax, candelilla wax, candelilla wax hydrocarbon, sunflower seed wax, and rice bran wax; esters such as trihexylenol; higher alcohols such as stearyl alcohol and behenyl alcohol; silicones such as acrylic acid-modified silicone; and sugar fatty acid esters such as dextrin palmitate and stearoyl inulin.

[0081] From the viewpoint of maintaining drop strength, the content of the aforementioned solid oil, based on the total amount of oily components, can be 0.1 to 5% by mass, 0.2 to 3% by mass, or 0.5 to 1% by mass. The cosmetic base material of this embodiment may not contain solid oil as other oily components.

[0082] From the perspective of balancing and improving ease of use, good spreadability, and adhesion to the skin, the content of oily components in cosmetic base materials can be 4-40% by mass, 7-35% by mass, or 10-30% by mass, based on the total amount of cosmetic base materials.

[0083] From the perspective of balancing the suppression of fallout, ease of application, and adhesion to the skin, the content of semi-solid oil in the cosmetic base material, that is, the total content of semi-solid (D) components and other semi-solid oils, can be 1-6% by mass, 2-5.5% by mass, 3-5% by mass, or 4-4.5% by mass, based on the total amount of the cosmetic base material.

[0084] <Other Ingredients> The cosmetic base material in this embodiment may further include additives commonly used in cosmetics as other components besides the aforementioned ingredients. Examples of additives include antioxidants such as polyols, surfactants, and tocopherols; preservatives such as ethylparaben, methylparaben, and chlorphenesin; fragrances; and beauty ingredients. The surfactant is preferably a low-HLB (e.g., HLB 3-6) nonionic surfactant, more preferably a sorbitan fatty acid ester-based nonionic surfactant. Sorbitan sesquiisostearate is an example of a sorbitan fatty acid ester-based nonionic surfactant.

[0085] Examples of polyols include dipropylene glycol, 1,3-butanediol, isopentyl glycol, 1,2-pentanediol, 1,2-hexanediol, polyethylene glycol, glycerol, diglycerol, sorbitol, maltitol, raffinose, etc.

[0086] From the viewpoint of maintaining storage stability by suppressing the decrease in hardness even under high temperature and high humidity environments, the content of polyols in the cosmetic base material is preferably less than 0.1% by mass, based on the total amount of the cosmetic base material, and can be less than 0.05% by mass or less, or less than 0.01% by mass. The cosmetic base material of this embodiment may not contain polyols.

[0087] Next, the dispersion medium contained in the slurry will be explained.

[0088] <Dispersion Medium> In this embodiment, the dispersion medium contains water. The dispersion medium may contain only water, or it may contain water and a volatile solvent other than water.

[0089] Examples of volatile solvents other than water include light liquid isoparaffins, ethanol, acetone, and isopropanol.

[0090] The water content in the dispersion medium is based on the total amount of the dispersion medium and can be 50-100% by mass, 80-100% by mass, or 100% by mass.

[0091] Next, the preparation method of the slurry will be explained.

[0092] <Preparation of the slurry> In step A, a powder paste containing a cosmetic base material comprising the above-mentioned components and a dispersion medium containing water is prepared. Regarding the preparation of the powder paste, a mixture of the components of the cosmetic base material can be mixed with the dispersion medium; the components of the cosmetic base material can be added to the dispersion medium in a prescribed order; or two or more mixtures consisting of a portion of the components of the cosmetic base material mixed with the dispersion medium can be prepared and then mixed together.

[0093] Mixing methods can include, for example, using a disperser, homogenizer, super mixer, Henschel mixer, pulverizer, etc.

[0094] In process A, heating or degassing of the slurry may be performed as needed.

[0095] When mixing the mixture of the components of a cosmetic base material with a dispersion medium, step A may include, for example, the following steps: obtaining a first mixture by mixing the components other than the oily components (powder components, thickeners, and other components) of the cosmetic base material in a predetermined proportion; and obtaining a second mixture by mixing the oily components in a predetermined proportion.

[0096] The steps for obtaining the first mixture and the second mixture can be carried out, for example, using a disperser, a homogenizer, etc. In the step of obtaining the second mixture, the oily components can be mixed while heating at 60 to 80°C, preferably at 60 to 70°C.

[0097] The steps of mixing the first mixture and the second mixture can be carried out, for example, using a high-speed mixer or a Henschel mixer, or, if necessary, by pulverizing using a pulverizer.

[0098] By mass ratio, the mixing ratio of cosmetic base material to dispersion medium can be: cosmetic base material: dispersion medium = 100:100~100:10, 100:100~100:40, or 100:100~100:80.

[0099] (Process B) Next, we will explain process B.

[0100] Step B may include: filling a container with slurry; and removing the dispersion medium from the slurry filled in the container and molding it.

[0101] As a designated container, medium-sized trays such as metal trays and resin trays can be listed.

[0102] Regarding the steps of removing the dispersion medium from the slurry filled in the container and molding, for example, the solvent can be removed after molding, molding can be performed after solvent removal, or solvent removal and molding can be performed simultaneously. As a method of molding, compression molding using a suction compression molding machine can be cited as an example. As a method of removing solvent, drying using a hot air dryer, a freeze dryer, or the like can be cited as an example.

[0103] After the above-mentioned processes A and B, solid powder cosmetics can be obtained.

[0104] The solid powder cosmetic material obtained by the method of this embodiment can be used as a color cosmetic material such as loose powder, foundation, eyeshadow, blush, eyebrow powder, and nose shadow.

[0105] The solid powder cosmetic obtained by the method of this embodiment can be applied to the skin or eyebrows using an application tool. Examples of application tools include pen-shaped, chip-shaped, powder puff-shaped, and brush-shaped application tools.

[0106] [Solid Powder Cosmetics] The solid powder cosmetic of this embodiment is a solid powder cosmetic containing powder components and oil components. The powder components include: (A) plate-shaped powder containing alumina and (B) spherical powder. The solid powder cosmetic further includes (C) a water-soluble thickener. The oil components include (D) a water-retaining oil agent.

[0107] The solid powder cosmetic of this embodiment can be prepared by the manufacturing method of the solid powder cosmetic of this embodiment described above, and has excellent usability (less powder fallout, easy to use in appropriate amounts), excellent makeup effect (adhesion to the skin, transparent makeup), sufficient impact resistance and sufficient storage stability.

[0108] The composition and content of the solid powder cosmetic in this embodiment can be the same as the cosmetic base material in the manufacturing method of the solid powder cosmetic in this embodiment described above.

[0109] For the solid powder cosmetic of this embodiment, the hardness at 25°C, measured using a load tester (rheometer, manufactured by Leotec Co., Ltd.) under the following conditions, can be 0.1 to 10 N, 0.5 to 5 N, or 1 to 3 N. Measuring apparatus: Rheometer (manufactured by Leotec Co., Ltd.) [Measurement Conditions] Adapter: A cylinder with a diameter of 1.0mm Needle penetration depth: 1.0mm Needle insertion speed: 2cm / min

[0110] The solid powder cosmetic material of this embodiment can be used as a color cosmetic material such as loose powder, foundation, eyeshadow, blush, eyebrow powder, and nose shadow.

[0111] The solid powder cosmetic of this embodiment has excellent usability (minimal powder fallout, easy to apply in appropriate amounts), therefore, it can be applied to the skin or eyebrows using an application tool. Examples of application tools include pen-shaped, pointed, powder puff-shaped, and brush-shaped tools.

[0112] [Example] The present invention will be further described in detail below through embodiments, but these embodiments do not limit the technical scope of the present invention. It should be noted that, unless otherwise specified, the values ​​in the table represent the content (parts by mass) when the total amount of cosmetic base material is 100 parts by mass.

[0113] Before describing the embodiments, the evaluation methods used in each embodiment will be explained.

[0114] (1) Sensory evaluation Ten cosmetics evaluation professionals used brushes as application tools to apply samples of solid powder cosmetics from the examples and comparative examples onto the skin. The evaluation criteria included the absence of powder fallout, the ease of adjusting the amount of powder adhering to the application tool, the adhesion to the skin, the transparency of the makeup, and the good spreadability. Each of these criteria was evaluated at five levels, and the average score was determined based on the following standards. [Rating: Evaluation Criteria] 5: Very good 4: Good 3: General 2: Slightly worse 1: Poor [Judgment Criteria (Average Score)] ◎: 4 or more ○: 3 or more to less than 4 △: 2 or more to less than 3 ×: Less than 2

[0115] (2) Formability For the molded products after compression molding and drying, visually observe whether cracks, peeling, crazing, etc. occur on the surface of the solid powder cosmetic sample. Evaluate the degree of occurrence according to the following evaluation criteria, score each sample, and determine the average score when n=5 according to the following criteria. [Rating: Evaluation Criteria] 4: No change 3: If slight cracks, peeling, or crazing are found... 2: Cracks, peeling, and crazing are found. 1. Cracks, peeling, and crazing occur very frequently. [Judgment Criteria (Average Score)] ◎:3.5 or above ○: 3.0 or more to less than 3.5 △: 2.0 or more to less than 3.0 ×: Less than 2.0

[0116] (3) Impact resistance After dropping a sample of solid powder cosmetic material from a height of 50 cm onto a plastic tile with the contents facing upwards 5 times, observe its condition. Evaluate the appearance of cracks, defects, collapses, etc. according to the following judgment criteria in four levels. Score each sample and determine the average score when n=5 according to the following criteria. [Rating: Evaluation Criteria] 4: No change 3: Cracks were found 2: Defects were found 1: More than half of the landslides were discovered. [Judgment Criteria (Average Score)] ◎:3.5 or above ○: 3.0 or more to less than 3.5 △: 2.0 or more to less than 3.0 ×: Less than 2.0

[0117] (4) Preservation stability Samples of solid powder cosmetics were stored in a constant temperature bath set at 40°C and 70% humidity for 4 weeks. Using a load tester (rheometer, manufactured by Leotec Co., Ltd.), the hardness of the solid powder cosmetics before and after storage was measured under the following conditions, and the average value when n=5 was calculated. Based on the reduction ratio of the hardness after storage to the initial value ([(initial value) - (hardness after storage)] × 100 / (initial value)), the hardness was judged in three levels according to the following criteria. [Measurement Conditions] Adapter: A cylinder with a diameter of 1.0mm Penetration depth: 1.0 mm Penetration speed: 2 cm / min Measurement temperature: 25 °C [Judgment criteria] ○: The reduction ratio of hardness is less than 10%. △: The reduction ratio of hardness is 10% or more and less than 15%. ×: The reduction ratio of hardness is 15% or more

[0118] (Examples 1 to 32, Comparative Examples 1 to 6) Solid powder cosmetics (loose powder) having the compositions shown in Tables 1 to 5 were prepared by the following production method and evaluated as described above. The results are shown together in Tables 1 to 5.

[0119] [Production method] The oily components were heated to 60 - 80 °C and mixed to obtain Mixture I. The materials other than the oily components in the cosmetic base material (powder components, thickeners, additives, and other components) were uniformly dispersed by a Henschel mixer to obtain Mixture II. I was added to II and uniformly dispersed by a Henschel mixer to obtain the cosmetic base material. Water was added as a solvent to 100 parts by mass of this cosmetic base material to reach the parts by mass described in Tables 1 to 5, and after slurry formation by kneading, it was filled into a medium-sized pan (metal pan), compression-molded, and then dried to remove water, thereby producing loose powder.

[0120] [Table 1]

[0121] [Table 2]

[0122] [Table 3]

[0123] [Table 4] [[ID=ABC]]

[0124] [Table 5]

[0125] The details of each component in Tables 1 to 5 are described below.

[0126] [Powder components] <Component (A)>[[]] (A1) Single crystal alumina: Single crystal alumina (manufactured by Merck Performance Materials K.K., trade name "RonaFlair (registered trademark) White Sapphire", average particle size of about 8 μm) (A2) Alumina matrix pearlescent agent: Titanium oxide coated alumina pearlescent agent (manufactured by Melk Co., Ltd., trade name "RonaFlair (registered trademark) Golden Lights", average particle size: 22.5μm)

[0127] <(B) Ingredients> Spherical silica 1: Cetyl alcohol treated spherical silica (average particle size: 13 μm, surface treatment agent 1% by mass) Spherical silica 2: Spherical silica (average particle size: 7 μm, untreated) Spherical Nylon: Spherical nylon (average particle size: 5μm, untreated)

[0128] <Other> Calcium carbonate: Calcium carbonate (plate-like, average particle size: 5μm) Synthetic fluorophlogopite 1: SA-treated synthetic fluorophlogopite (manufactured by Miyoshi Chemical Co., Ltd., average particle size: 10 μm) Synthetic fluorophlogopite 2: Synthetic fluorophlogopite (average particle size: 10 μm, untreated) Synthetic fluorophlogopite 3: Synthetic fluorophlogopite (average particle size: 20 μm, untreated) Amino acid treated mica: NAI treated mica (manufactured by Miyoshi Chemical Co., Ltd., average particle size: approx. 20 μm, surface treatment agent 1% by mass) Silicone-treated aluminum hydroxide coated mica: SA-treated aluminum hydroxide coated mica (manufactured by Miyoshi Chemical Co., Ltd., trade name "SA-Eccellmica JP-2", surface treatment agent 3% by mass) Boron nitride: Boron nitride (average particle size: 11 μm) Talc: Talc (average particle size: 6.5μm) Silicone-treated talc: SA-treated talc (manufactured by Miyoshi Chemical Co., Ltd., average particle size: 6.5μm) Silicone-treated colorant: (Manufactured by Miyoshi Chemical Co., Ltd.) Pearlizing agent: Mica-based pearlizing agent (average particle size: 26μm)

[0129] [Thickener] <(C) Ingredients> Acrylic polymer 1: (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer (manufactured by SEPPIC SA, trade name "SEPI NOV EMT 10") Acrylic polymer 2: (Sodium acrylate / Sodium acryloyldimethyl taurate) copolymer (manufactured by Esu Enu Efu Co., Ltd., trade name "FLOCARE PSD 30") Silicic acid (Al / Mg): Magnesium aluminum silicate

[0130] [Oily ingredients] <(D) Components> Water-retaining oil 1: Phytosterol / Isostearyl / Cetyl alcohol / Stearyl alcohol / Behenyl alcohol Dimeric Linoleate (Semi-solid oil) (Manufactured by Nippon Seika Co., Ltd., trade name "Plandool-H") Water-retaining oil agent 2: Hydrogenated castor oil isostearate (semi-solid oil) (manufactured by Nashon Misomatsu Co., Ltd., trade name "Castride MIS-P") Water-retaining oil 3: Bis-behenol / isostearyl / phytosterol dimeric linoleic acid dimeric linoleate (semi-solid oil) (manufactured by Nippon Seika Co., Ltd., trade name "Plandool-G") Water-retaining oil 4: Dimeric pentaerythritol hexahydroxystearate / hexastearate / hexapine ester (semi-solid oil) (manufactured by Nissin Olyo Group Co., Ltd., trade name "Cosmo 168ARV") Water-retaining oil 5: Phytosterol / isostearyl di-linoleate (liquid oil, viscosity: 2300 mPa·s) (manufactured by Nippon Seika Co., Ltd., trade name "LUSPLAN-PI-DA")

[0131] <Other> Silicone Oil 1: Polydimethylsiloxane (viscosity: 100 mPa·s) Ester Oil 1: Glyceryl Tri(Ethylhexanoic Acid) Ester (Viscosity: 31 mPa·s) Ester Oil 2: Caprylic / Capric Triglyceride (Viscosity: 30 mPa·s) Ester Oil 3: Neopentyl glycol di(ethylhexanoate) ester (viscosity: 12.5 mPa·s) Petroleum grease: Petroleum grease (semi-solid oil) (manufactured by Nikko Lika Co., Ltd., trade name "Sunflower White (P-150)")

[0132] The viscosity of liquid oil is determined according to the following method. (Methods for measuring viscosity) For samples at 25°C, measurements were performed using a Brinell viscometer (BM type) under the following conditions. It should be noted that the measurement time was set to 1 minute. 5~50mPa·s: BM type, BL adapter, speed 12rpm 50~500mPa·s: BM type, rotor No.1, speed 12rpm 250~2500mPa·s: BM type, rotor No.2, speed 12rpm 1000~10000mPa·s: BM type, rotor No.3, speed 12rpm 5000~50000 mPa·s: BM type, rotor No.4, speed 12 rpm

[0133] <Other Ingredients> Surfactant: Sorbitan sesquiisostearate (viscosity: 3900 mPa·s) Polyols: Glycerin

[0134] As shown in Tables 1-5, the solid powder cosmetics obtained in Examples 1-32 did not receive any "×" ratings in any of the items, confirming that they can effectively suppress powder fallout when wiped with a coating tool, and have sufficient adhesion to the skin, transparency of the makeup, impact resistance, and storage stability.

[0135] (Example 33: Foundation)

[0136] The details of the above-mentioned ingredients are the same as those described above, except for the ingredients shown below. [Powder ingredients] Silica 1: Silicone-treated, titanium dioxide-encapsulated silica (average particle size: 4.5 μm) Composite Powder: Titanium oxide, silica, alumina, and mica composite powder (manufactured by Melk Co., Ltd., trade name "Ronaflair (registered trademark) Softshade" (average particle size: 10μm) (plate-shaped powder with a mixture of titanium oxide, silica, and alumina coated on the surface of mica) Microparticle titanium dioxide: Microparticle titanium dioxide (average particle size: 0.14 μm) Zinc oxide: Zinc oxide (average particle size: 1 μm) Titanium oxide: Titanium oxide (average particle size: 0.25 μm)

[0137] <Preparation Method> The oily components are heated to 60–80°C and mixed to obtain mixture I. Materials other than the oily components (powder components, thickeners, additives, and other ingredients) in the cosmetic base material are uniformly dispersed using a Henschel mixer to obtain mixture II. Mixture I is added to II and uniformly dispersed using a Henschel mixer to obtain the cosmetic base material. 100 parts by weight of water are added to 100 parts by weight of this cosmetic base material as a solvent, and the mixture is kneaded to form a slurry. This slurry is then filled into a medium-sized disc (metal disc), compressed, and dried to remove water, thus producing the foundation.

[0138] <Evaluation> After conducting the same evaluation as described above on the obtained foundation samples, the following evaluations were confirmed: "No fallout, easy to apply in appropriate amounts" was marked with "◎", "Adhesion to skin" was marked with "○", "Transparency of makeup" was marked with "○", "Good spreadability" was marked with "○", "Formability" was marked with "◎", "Impact resistance" was marked with "◎", and "Storage stability" was marked with "○".

[0139] (Example 34: Eyeshadow)

[0140] The details of the above-mentioned components are the same as those described above.

[0141] <Preparation Method> The oily components are heated to 60–80°C and mixed to obtain mixture I. Materials other than the oily components (powder components, thickeners, additives, and other ingredients) in the cosmetic base material are uniformly dispersed using a Henschel mixer to obtain mixture II. Mixture I is added to II and uniformly dispersed using a Henschel mixer to obtain the cosmetic base material. 80 parts by weight of water are added to 100 parts by weight of this cosmetic base material as a solvent, and the mixture is kneaded to form a slurry. This slurry is then filled into a medium-sized pan (metal pan), compressed, and dried to remove water, thus producing eyeshadow.

[0142] <Evaluation> After conducting the same evaluation as described above on the obtained eyeshadow samples, the following evaluations were confirmed: "No fallout, easy to apply in appropriate amounts" was marked with "◎", "Adhesion to skin" was marked with "○", "Transparency of makeup" was marked with "◎", "Good spreadability" was marked with "○", "Shaping properties" was marked with "◎", "Impact resistance" was marked with "◎", and "Storage stability" was marked with "○".

Claims

1. A method for manufacturing a solid powder cosmetic, comprising: A process for preparing a powder paste containing a cosmetic base material and a dispersion medium, wherein the cosmetic base material contains powder components and oily components, and the dispersion medium contains water; and The process involves filling the slurry into a container, removing the dispersion medium, and then molding the mixture. The powder composition includes (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder composed of alumina single crystals and (A2) plate-shaped powder with metal oxides coated on the surface of alumina, and (B) spherical powder. The cosmetic base material further comprises (C) a water-soluble thickener. The oily component includes (D) a water-retaining oil agent.

2. The method for manufacturing solid powder cosmetics as described in claim 1, wherein, The content of polyols in the cosmetic base material is less than 0.1% by mass, based on the cosmetic base material.

3. The method for manufacturing solid powder cosmetics as described in claim 1, wherein, The content of component (D) in the cosmetic base material is less than 50% by mass, based on the total amount of the oily components.

4. The method for manufacturing solid powder cosmetics as described in claim 1, wherein, The (C) component contains one or more thickeners selected from the group consisting of acrylic copolymers and clay minerals.

5. The solid powder cosmetic as described in claim 1, wherein, The (C) component comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymer, and sodium acrylate grafted starch.

6. The method for manufacturing solid powder cosmetics as described in claim 1, wherein, Component (B) comprises spherical particles that have been surface-treated with higher alcohols.

7. The method for manufacturing solid powder cosmetics as described in claim 1, wherein, The content of semi-solid oil in the cosmetic base material is 1-6% by mass, based on the total amount of the cosmetic base material.

8. The method for manufacturing solid powder cosmetics as described in claim 2, wherein, The content of component (D) in the cosmetic base material, based on the total amount of the oily components, is less than 50% by mass. Component (C) comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymers, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymers, and sodium acrylate-grafted starch. Component (B) contains spherical particles that have been surface-treated with higher alcohols. The content of semi-solid oil in the cosmetic base material is 1-6% by mass, based on the total amount of the cosmetic base material.

9. A solid powder cosmetic, comprising powder components and oil components, wherein, The powder composition includes (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder composed of alumina single crystals and (A2) plate-shaped powder with metal oxides coated on the surface of alumina, and (B) spherical powder. The solid powder cosmetic further comprises (C) a water-soluble thickener. The oily component includes (D) a water-retaining oil agent.

10. The solid powder cosmetic as described in claim 9, wherein, The polyol content in the solid powder cosmetic is less than 0.1% by mass, based on the solid powder cosmetic.

11. The solid powder cosmetic as described in claim 9, wherein, The content of component (D) in the solid powder cosmetic is less than 50% by mass, based on the total amount of the oily components.

12. The solid powder cosmetic as described in claim 9, wherein, The (C) component contains one or more thickeners selected from the group consisting of acrylic copolymers and clay minerals.

13. The solid powder cosmetic as described in claim 9, wherein, The (C) component comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymer, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymer, and sodium acrylate grafted starch.

14. The solid powder cosmetic as described in claim 9, wherein, Component (B) comprises spherical particles that have been surface-treated with higher alcohols.

15. The solid powder cosmetic as described in claim 9, wherein, The semi-solid oil content in the solid powder cosmetic is 1-6% by mass, based on the total amount of the solid powder cosmetic.

16. The solid powder cosmetic as claimed in claim 10, wherein, The content of component (D) in the solid powder cosmetic is less than 50% by mass, based on the total amount of the oily components. Component (C) comprises one or more acrylic copolymers selected from the group consisting of (hydroxyethyl acrylate / sodium acryloyl dimethyl taurate) copolymers, (sodium acrylate / sodium acryloyl dimethyl taurate) copolymers, and sodium acrylate-grafted starch. Component (B) contains spherical particles that have been surface-treated with higher alcohols. The semi-solid oil content in the solid powder cosmetic is 1-6% by mass, based on the total amount of the solid powder cosmetic.

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