Method for producing solid powder cosmetics and solid powder cosmetics

Abstract

To provide a solid powder cosmetic having excellent usability (less powder scattering and easy to take the appropriate amount), excellent finish (adhesion to the skin and a transparent finish), sufficient impact resistance and sufficient storage stability, and a method for producing such a solid powder cosmetic by a wet process using water. [Solution] A method for producing a solid powder cosmetic comprises the steps of: preparing a slurry containing a cosmetic base containing a powder component and an oily component, and a dispersion medium containing water; and filling the slurry into a container and removing the dispersion medium to form a shape, wherein the powder component comprises (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder made of alumina single crystals and (A2) plate-shaped powder in which a metal oxide is coated on the surface of alumina, and (B) spherical powder, the cosmetic base further comprises (C) a water-soluble thickener, and the oily component comprises (D) a water-retaining oil.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a solid powder cosmetic and a solid powder cosmetic.

Background Art

[0002] Solid powder cosmetics composed of a powder component and an oily component are used as makeup cosmetics such as blush, eyeshadow, foundation, and face powder. Many of these cosmetics are used in a form that is stored in a compact container for portability. Such solid powder cosmetics are produced by a dry method in which a cosmetic base material obtained by mixing a powder component and an oily component is filled into a container such as a gold plate and pressure-molded, or a wet method in which a volatile organic solvent such as a volatile hydrocarbon oil or a volatile lower alcohol is added to the cosmetic base material as a dispersion medium to form a slurry, filled into a container, and then the dispersion medium is removed and compression-molded.

[0003] Solid powder cosmetics obtained by the wet method are likely to provide a good feeling in use, such as good elongation during application. In recent years, in consideration of the environment, a wet method using water as a solvent has also been studied (for example, refer to Patent Document 1 below).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, compared to methods using volatile organic solvents, wet manufacturing methods using water tend to make slurry filling more difficult and increase the amount of dispersion medium required. As a result, the cosmetics after drying are more prone to surface cracking, internal voids, and gaps between the outer surface and the container. These defects can lead to usability problems, such as powder scattering when scraping the solid powder cosmetic with an applicator, making it difficult to take the appropriate amount, and can also reduce the impact resistance of the solid powder cosmetic.

[0006] The method for producing solid powder cosmetics described in Patent Document 1 above aims to improve the impact resistance of solid powder cosmetics by using a slurry containing specific powder components, specific oily components, polyhydric alcohols, and specific surfactants in specific proportions. However, the inventors' research has shown that solid powder cosmetics containing polyhydric alcohols may experience a significant decrease in hardness in high-humidity environments. Since excessive hardness reduction can lead to decreased drop strength and changes in usability, there is room for improvement in terms of storage stability of solid powder cosmetics even in the above-mentioned conventional technology.

[0007] On the other hand, solid powder cosmetics also have requirements regarding the finish of the makeup. Specifically, for example, face powder used to finish makeup needs to spread well on the skin, have minimal dryness and powder fallout, blend easily, adhere well to the skin, and provide a translucent finish. It is known that increasing the amount of spherical powders such as silica and nylon improves spreadability on the skin, but in this case, adhesion to the skin tends to decrease, and problems such as powder fallout when rubbed with an applicator and the aforementioned decrease in impact resistance are more likely to occur. Face powders are mainly applied to the skin by rubbing them with an applicator such as a brush, so excellent usability such as minimal powder fallout and easy acquisition of the appropriate amount is required.

[0008] The present invention has been made in view of the above circumstances, and aims to provide a solid powder cosmetic having excellent usability (less powder scattering and easy to take the appropriate amount), excellent finish (adhesion to the skin and a transparent finish), sufficient impact resistance and sufficient storage stability, as well as a method for producing such a solid powder cosmetic by a wet process using water. [Means for solving the problem]

[0009] The present invention provides a method for producing the following [1] to [3] solid powder cosmetics. [1] A method for producing a solid powder cosmetic, comprising the steps of: preparing a slurry containing a cosmetic base containing a powder component and an oily component, and a dispersion medium containing water; filling the slurry into a container, removing the dispersion medium, and molding, wherein the powder component comprises (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder made of alumina single crystals and (A2) plate-shaped powder in which a metal oxide is coated on the surface of alumina, and (B) spherical powder, the cosmetic base further comprises (C) a water-soluble thickener, and the oily component comprises (D) a water-retaining oil. [2] The method for producing a solid powder cosmetic according to [1], wherein the content of polyhydric alcohol in the cosmetic base is less than 0.1% by mass, based on the cosmetic base. [3] A method for producing a solid powder cosmetic according to [1] or [2], wherein the content of component (D) in the cosmetic base is 50% by mass or less based on the total amount of the oily component.

[0010] The present invention also provides the following [4] to [6] solid powder cosmetics. [4] A solid powder cosmetic comprising a powder component and an oily component, wherein the powder component comprises (A) at least one plate-shaped powder selected from the group consisting of (A1) plate-shaped powder made of alumina single crystals and (A2) plate-shaped powder in which a metal oxide is coated on the surface of alumina, and (B) spherical powder, the solid powder cosmetic further comprises (C) a water-soluble thickener, and the oily component comprises (D) a water-retaining oil. [5] The solid powder cosmetic according to [4], wherein the content of polyhydric alcohol in the solid powder cosmetic is less than 0.1% by mass, based on the solid powder cosmetic. [6] The solid powder cosmetic according to [4] or [5], wherein the content of component (D) in the solid powder cosmetic is 50% by mass or less based on the total amount of the oily component. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a solid powder cosmetic having excellent usability (less powder scattering and easy to take the appropriate amount), excellent finish (adhesion to the skin and a transparent finish), sufficient impact resistance and sufficient storage stability, as well as a method for producing such a solid powder cosmetic by a wet process using water. [Modes for carrying out the invention]

[0012] [Method for manufacturing solid powder cosmetics] The method for producing a solid powder cosmetic according to this embodiment comprises: step A, preparing a slurry containing a cosmetic base material containing powder components and oily components, and a dispersion medium containing water; and step B, filling the slurry into a container, removing the dispersion medium, and molding it.

[0013] The above cosmetic base material comprises, as a powder component, at least one plate-like powder (sometimes referred to as component (A)) selected from the group consisting of (A1) plate-like powder made of alumina single crystal (sometimes referred to as component (A1)) and (A2) plate-like powder in which a metal oxide is coated on the surface of alumina (sometimes referred to as component (A2)), and (B) spherical powder (sometimes referred to as component (B)), and further comprises (C) a water-soluble thickener (sometimes referred to as component (C)), and as an oily component, comprises (D) a water-retaining oil (sometimes referred to as component (D)).

[0014] According to the method for producing solid powder cosmetics of this embodiment, a solid powder cosmetic having the above configuration can be obtained that has excellent usability (less powder scattering and easy to take the appropriate amount), excellent finish (adhesion to the skin and a transparent finish), sufficient impact resistance, and sufficient storage stability.

[0015] (Process A) First, let's explain the components that make up the cosmetic base material contained in the slurry.

[0016] <Powder components> In this embodiment, the powder component comprises component (A) and component (B).

[0017] (A) Any ingredient used in cosmetics may be used without any particular restrictions.

[0018] (A1) For the component, commercially available products such as "RonaFlair® White Sapphire" (manufactured by Merck KGaA, product name) can be used.

[0019] (A2) Examples of components include alumina matrix pearl agents in which a metal oxide such as titanium dioxide, tin oxide, or iron oxide is coated on the surface of a plate-shaped alumina. (A2) For example, commercially available products such as "Ronastar® Golden Lights" (manufactured by Merck KGaA, product name) and "Mirinae series" (manufactured by CQV Corporation, product name) can be used for component (A2).

[0020] (A) The average particle size of component (A) may be 2 to 100 μm, 4 to 80 μm, or 5 to 45 μm, from the viewpoint of adhesion to the skin, a transparent finish, and suppression of powder scattering. (A1) The average particle diameter of component (A2) may be 2 to 50 μm, 4 to 40 μm, or 5 to 30 μm. (A2) The average particle diameter of component (A2) may be 5 to 100 μm, 8 to 80 μm, or 15 to 45 μm. In this specification, the average particle size refers to the D50 value based on the volume distribution measured using a laser diffraction particle size analyzer.

[0021] (A) component can be used alone or in combination of two or more.

[0022] From the perspective of improving the adhesion to the skin and the transparency of the finish, the content of the (A) component in the cosmetic base material may be 0.1 to 75% by mass, 5 to 60% by mass, or 15 to 45% by mass based on the total amount of the cosmetic base material.

[0023] From the perspective of improving the adhesion to the skin and the transparency of the finish, the cosmetic base material may contain the (A1) component as the (A) component.

[0024] When the cosmetic base material contains the (A1) component, the content of the (A1) component in the cosmetic base material may 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 based on the total amount of the (A) component from the perspective of improving the transparency and gloss of the finish.

[0025] When the cosmetic base material contains the (A2) component, the content of the (A2) component in the cosmetic base material may 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 the (A) component from the perspective of improving the transparency and pearl feeling of the finish.

[0026] (B) component can be used without particular limitation as long as it is used in cosmetics.

[0027] (B) Examples of components 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, urethane powder, wool powder, silk powder, cellulose powder, amylose powder, N-acyllysine powder, and starch-derived powder.

[0028] (B) Component may be surface-treated. Any surface treatment used in cosmetics is not particularly limited and can be used, such as surface treatment with metal soaps, higher alcohols, higher fatty acids, oils and fats, waxes, silicone compounds, fluorine compounds, surfactants, dextrin fatty acid esters, etc.

[0029] The cosmetic base material may contain spherical particles surface-treated with a higher alcohol as component (B) from the viewpoint of suppressing powder scattering and improving adhesion to the skin.

[0030] Higher alcohols may be alcohols with 12 to 18 carbon atoms, or saturated aliphatic alcohols with 12 to 18 carbon atoms. Examples of higher alcohols include cetanol and stearyl alcohol.

[0031] The average particle size of component (B) may be 2-50 μm, 4-30 μm, or 5-15 μm, from the viewpoint of how well it spreads on the skin and how easily an appropriate amount can be taken out.

[0032] (B) Component can be used individually or in combination of two or more components.

[0033] The content of component (B) in the cosmetic base may be 1% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, 12% by mass or more, or 15% by mass or more, based on the total amount of the cosmetic base, from the viewpoint of good spreadability on the skin and ease of taking an appropriate amount. Alternatively, from the viewpoint of suppressing powder scattering and impact resistance, it may be 40% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less, based on the total amount of the cosmetic base.

[0034] From the perspective of suppressing powder scattering, improving adhesion to the skin (especially how easily it blends into the skin), and enhancing the transparency of the finish in a balanced manner, the total content of component (A) and component (B) in the cosmetic base may be 15-75% by mass, 25-55% by mass, or 30-50% by mass, based on the total amount of the cosmetic base.

[0035] From the perspective of suppressing powder scattering, improving adhesion to the skin (especially how easily it blends into the skin), and enhancing the transparency of the finish in a balanced way, the ratio of the content of component (A) to the content of component (B) in the cosmetic base [(A) / (B)] may be 0.1 to 20, 0.3 to 15, or 0.5 to 10.

[0036] The cosmetic base material may contain inorganic powders as component (B) from the viewpoint of making it easy to adjust the amount that adheres to the applicator when rubbed off (ease of removing the appropriate amount), as well as the transparency and spreadability of the finished product. Preferably, the inorganic powders contain spherical silica.

[0037] From the viewpoint of improving the ease of picking up the appropriate amount, adhesion to the skin, and spreadability in a balanced manner, the content of spherical silica in the cosmetic base may 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.

[0038] From the viewpoint of improving powder scattering suppression, ease of picking up the appropriate amount, transparency of the finished product, spreadability, and moldability in a balanced manner, the total content of component (A) and spherical silica in the cosmetic base material may be 15 to 75% by mass, 25 to 55% by mass, or 30 to 50% by mass, based on the total amount of the cosmetic base material.

[0039] From the viewpoint of suppressing powder scattering and improving adhesion to the skin, component (B) may include spherical silica surface-treated with a higher alcohol (higher alcohol-treated spherical silica).

[0040] From the viewpoint of improving powder scattering suppression, ease of picking up the appropriate amount, adhesion to the skin, transparency of the finish, spreadability, and moldability in a balanced manner, the content of higher alcohol-treated spherical silica in the cosmetic base may be 2 to 30% by mass, 3 to 20% by mass, or 4 to 16% by mass, based on the total amount of the cosmetic base.

[0041] From the viewpoint of good spreadability, ease of removal, and moldability, component (B) may contain spherical calcium carbonate. From the viewpoint of improving powder scattering suppression, ease of removal of the appropriate amount, good spreadability, and moldability in a balanced manner, the content of spherical calcium carbonate in the cosmetic base may be 0.1 to 10% by mass, 1 to 7% by mass, or 3 to 5% by mass, based on the total amount of the cosmetic base.

[0042] From the viewpoint of improving powder scattering suppression, ease of picking up the appropriate amount, transparency of the finish, spreadability, and moldability in a balanced manner, the total content of component (A) and spherical calcium carbonate in the cosmetic base may be 1 to 50% by mass, 5 to 47% by mass, or 20 to 45% by mass, based on the total amount of the cosmetic base.

[0043] The cosmetic base material of this embodiment may contain powder components other than components (A) and (B) (sometimes referred to as other powder components). Other powder components are not particularly limited as long as they are commonly used in cosmetics, and examples include extender powders, white pigments, and coloring pigments. The shape of other powder components is not particularly limited as long as they are not spherical, and they may have plate-like or needle-like shapes, or particle structures such as a mist, fine particles, pigment-grade particle size, porous, or non-porous.

[0044] Specifically, examples include extender pigments such as mica, synthetic mica, sericite, talc, kaolin, boron nitride, silicon carbide, barium sulfate, aluminum oxide, silica, magnesium oxide, zirconium oxide, magnesium carbonate, calcium carbonate, chromium oxide, and aluminum magnesium hydroxide; white pigments such as titanium dioxide and zinc oxide; organic powders such as polyethylene powder, polystyrene powder, organopolysiloxane elastomer powder, polymethylsilsesquioxane powder, urethane powder, wool powder, silk powder, cellulose powder, and N-acyllysine powder; and composite powders such as fine-particle titanium dioxide-coated titanium mica, fine-particle titanium dioxide-coated nylon, barium sulfate-coated titanium mica, titanium dioxide-containing silica, zinc oxide-containing silica, and alumina-coated mica.

[0045] Examples of coloring pigments include inorganic coloring pigments such as red iron oxide, yellow iron oxide, black iron oxide, cobalt oxide, chromium oxide, ultramarine, Prussian blue, titanium dioxide, and zinc oxide; organic coloring pigments such as Red No. 228, Red No. 226, Blue No. 404, Red No. 202, Yellow No. 4, and aluminum lake; pearl pigments such as titanium mica, fish scale foil, bismuth oxychloride, and aluminum flakes; and natural pigments such as carmine and safflower.

[0046] From the viewpoint of moldability, it is preferable that the cosmetic base material contains at least one of calcium carbonate and magnesium carbonate having a shape other than spherical as other powder components. From the viewpoint of moldability, the total content of calcium carbonate and magnesium carbonate having a shape other than spherical in the cosmetic base material may 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] When a cosmetic base material contains spherical calcium carbonate or magnesium carbonate and calcium carbonate or magnesium carbonate having a shape other than spherical, from the viewpoint of moldability, the total content of calcium carbonate and magnesium carbonate in the cosmetic base material may 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.

[0048] The cosmetic base material may contain, or may not contain, other powder components that have an ultraviolet scattering effect (also called ultraviolet scattering agents). Examples of ultraviolet scattering agents include fine particle titanium dioxide and zinc oxide. The amount of ultraviolet scattering agent in the cosmetic base material may be 1 to 40% by mass, 3 to 30% by mass, or 5 to 25% by mass, based on the total amount of the cosmetic base material.

[0049] Other powder components may be surface-treated. Surface treatments can be any type used in cosmetics, without particular limitations, and examples include surface treatments using metal soaps, higher fatty acids, oils and fats, waxes, silicone compounds, fluorine compounds, surfactants, dextrin fatty acid esters, etc.

[0050] From the viewpoint of good spreadability, the powder content in the cosmetic base material may be 60-96% by mass, 65-93% by mass, or 70-90% by mass, based on the total amount of the cosmetic base material.

[0051] <Thickening agent> In this embodiment, the cosmetic base further comprises (C) a water-soluble thickener (sometimes referred to as component (C)).

[0052] (C) Component is an additive that increases the viscosity of a liquid when dissolved in water, and can be used without any particular restrictions as long as it is used in cosmetics.

[0053] From the standpoint of suppressing powder scattering, ensuring adhesion to the skin, achieving a transparent finish, and impact resistance, component (C) may contain one or more thickeners selected from the group consisting of polyacrylamide copolymers and clay minerals.

[0054] When the cosmetic base material contains a polyacrylamide copolymer as component (C), it becomes possible to further suppress powder scattering, improve fall strength and adhesion to the skin to a higher level. This is because the polyacrylamide copolymer is thought to enhance the dispersibility of the powder in the slurry, thereby improving the slurry's packing ability, and also function as a binder in the molded product (solid powder cosmetic) after the dispersion medium has been removed. Examples of polyacrylamide copolymers include (hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer, (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, and sodium acrylate graft starch.

[0055] When the cosmetic base material contains clay minerals as component (C), it is possible to further suppress powder scattering and improve drop strength to an even higher level. This is because the clay minerals enhance the dispersibility of the powder in the slurry, thereby improving the packing ability of the slurry, and also function as a binder in the molded product (solid powder cosmetic) after the dispersion medium has been removed. Examples of clay minerals include bentonite, magnesium aluminum silicate, and hectorite.

[0056] From the perspective of improving powder scattering suppression, ease of picking up the appropriate amount, adhesion to the skin, transparency of the finish, and impact resistance in a balanced manner, the content of component (C) in the cosmetic base may be 0.01 to 10% by mass or 0.05 to 5% by mass, based on the total amount of the cosmetic base.

[0057] When the cosmetic base contains a polyacrylamide copolymer as component (C), the amount of polyacrylamide copolymer may be 0.01 to 0.5% by mass, 0.05 to 0.4% by mass, or 0.10 to 0.25% by mass, based on the total amount of the cosmetic base, from the viewpoint of improving powder scattering suppression, ease of picking up the appropriate amount, adhesion to the skin, transparency of the finish, and impact resistance in a balanced manner.

[0058] If the cosmetic base contains clay minerals as component (C), the amount of clay minerals may 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, from the viewpoint of improving the suppression of powder scattering, ease of picking up the appropriate amount, adhesion to the skin, transparency of the finish, and impact resistance in a balanced manner.

[0059] <Oily components>

[0060] In this embodiment, the oily component includes (D) a water-retaining oil (sometimes referred to as component (D)). A water-retaining oil means an oil having a water-retaining capacity equal to or greater than its own weight (100% or more).

[0061] Component (D) may be an oil having a water-holding capacity of 100% or more at room temperature (25°C). Component (D) may also be a liquid oil or a semi-solid oil, and is preferably a semi-solid oil.

[0062] In this specification, "liquid oil" refers to oil that is liquid at 25°C, and "semi-solid oil" refers to oil that is paste-like at 25°C.

[0063] (D) Examples of components include liquid oils such as di(isostearyl / phytosteryl) dimer dilinoleate and fatty acid (C10-30) (cholesterol / lanosterol) esters; and semi-solid oils such as dimer dilinoleate (phytosteryl / isostearyl / cetyl / stearyl / behenyl), hydrogenated castor oil isostearate, dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, hexa(hydroxystearate / stearic acid / rosinic acid) dipentaerythrityl, and tetra(hydroxystearate / isostearate) dipentaerythrityl. In particular, from the viewpoint of improving usability, semi-solid oils of phytosterol derivatives such as dimer dilinoleate (phytosteryl / isostearyl / cetyl / stearyl / behenyl) and dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate are preferred.

[0064] The content of component (D) in the cosmetic base may 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, from the viewpoint of adhesion to the skin.

[0065] From the viewpoint of ease of dispensing in an appropriate amount and moldability, the content of component (D) in the cosmetic base may be 50% by mass or less, 40% by mass or less, 35% by mass or less, or 33% by mass or less, based on the total amount of oily components. Furthermore, from the viewpoint of adhesion to the skin and impact resistance, the above content may be 1% by mass or more, 10% by mass or more, or 25% by mass or more.

[0066] The cosmetic base material of this embodiment may contain oily components other than component (D) (sometimes referred to as other oily components). The other oily components are not particularly limited as long as they are commonly used in cosmetics, and solid oils, semi-solid oils, and liquid oils can be used.

[0067] Examples of liquid oils (hereinafter also referred to as other liquid oils) include cetyl ethylhexanoate, ethylhexyl palmitate, triethylhexanoin, isotridecyl isononanoate, isostearyl isostearate, neopentyl glycol diethylhexanoate, polyglyceryl-2 isostearate, caprylic / capric triglyceride, neopentyl glycol dicaprate, propanediol diisostearate, trimethylolpropane triethylhexanoate, octyldodecyl myristate, and octyl stearoyl oxystearate. Examples include ester oils such as dodecyl, diisostearyl malate, polyglyceryl triisostearate, dipentaerythrityl pentaisostearate, trimethylolpropane triisostearate, and caprylic / capric triglyceride; hydrocarbon oils such as olefin oligomers, liquid paraffin, squalane, and hydrogenated polyisobutene; silicone oils such as dimethicone; vegetable oils such as sunflower seed oil, jojoba seed oil, olive oil, and castor oil; and higher alcohols such as isostearyl alcohol, octyldodecanol, and oleyl alcohol.

[0068] From the viewpoint of improving the balance between suppressing powder scattering, ease of picking up the appropriate amount, and spreadability, the content of other liquid oils in the cosmetic base may be 50-95% by mass, 60-80% by mass, or 65-75% by mass, based on the total amount of oily components.

[0069] Other liquid oils may 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, or high-viscosity liquid oils with a viscosity exceeding 1000 mPa·s at 25°C, or combinations thereof. When the cosmetic base contains other liquid oils, it is preferable from the viewpoint of good spreadability and a natural finish that it contains low-viscosity liquid oils, or low-viscosity liquid oils and medium-viscosity liquid oils.

[0070] In this specification, the viscosity of liquid oil at 25°C refers to the value measured using a Brookfield viscometer (BM type) on a sample at 25°C under the following conditions. The measurement time is 1 minute. 5-50 mPa·s: BM type, BL adapter, rotation speed 12 rpm 50-500 mPa·s: BM type, rotor No. 1, rotation speed 12 rpm 250-2500 mPa·s: BM type, rotor No. 2, rotational speed 12 rpm 1000~10000 mPa·s: BM type, rotor No. 3, rotation speed 12 rpm 5000~50000 mPa·s: BM type, rotor No. 4, rotational speed 12 rpm

[0071] From the viewpoint of improving the ease of taking an appropriate amount, adhesion to the skin, and spreadability in a well-balanced manner, the content of the low-viscosity liquid oil may be 20-95% by mass, 35-80% by mass, or 45-75% by mass, based on the total amount of oily components.

[0072] From the viewpoint of improving the ease of taking an appropriate amount, adhesion to the skin, and spreadability in a balanced manner, the content of the low-viscosity liquid oil may be 50 to 300 parts by mass, 70 to 250 parts by mass, or 90 to 200 parts by mass per 100 parts by mass of component (D).

[0073] From the viewpoint of improving the ease of taking an appropriate amount, adhesion to the skin, and spreadability in a balanced manner, the content of the above-mentioned medium viscosity liquid oil may be 0.1 to 80% by mass, 5 to 70% by mass, or 10 to 60% by mass, based on the total amount of oily components.

[0074] From the viewpoint of improving the ease of taking an appropriate amount, adhesion to the skin, and spreadability in a balanced manner, the content of the above-mentioned medium viscosity liquid oil may be 0.1 to 200 parts by mass, 1 to 150 parts by mass, or 10 to 100 parts by mass per 100 parts by mass of component (D). The cosmetic base of this embodiment may not contain medium viscosity liquid oil as other oily components.

[0075] From the viewpoint of improving the ease of picking up the appropriate amount, adhesion to the skin, and spreadability in a balanced manner, the content of the above-mentioned high-viscosity liquid oil may be 0.1 to 80% by mass, 0.5 to 70% by mass, or 1 to 60% by mass, based on the total amount of oily components. The cosmetic base of this embodiment may not contain high-viscosity liquid oil as other oily components.

[0076] From the viewpoint of improving the ease of taking an appropriate amount, adhesion to the skin, and spreadability in a balanced manner, the content of the low-viscosity liquid oil and the medium-viscosity liquid oil may be 50-100% by mass, 0-50% by mass, 60-80% by mass, 20-40% by mass, 65-75% by mass, and 25-35% by mass, respectively, based on the total amount of other oily components.

[0077] Other liquid oils may be non-polar oils, polar oils, or combinations thereof. When the cosmetic base contains other liquid oils, it is preferable to include non-polar oils from the viewpoint of good spreadability and a natural finish. Examples of non-polar oils include ester oils such as cetyl ethylhexanoate, ethylhexyl palmitate, triethylhexanoin, isotridecyl isononanoate, isostearyl isostearate, neopentyl glycol diethylhexanoate, caprylic / capric triglyceride, neopentyl glycol dicaprate, trimethylolpropane triethylhexanoate, octyldodecyl myristate, trimethylolpropane triisostearate, and caprylic / capric triglyceride; hydrocarbon oils such as olefin oligomers, liquid paraffin, squalane, and hydrogenated polyisobutene; and silicone oils such as dimethicone.

[0078] From the viewpoint of improving spreadability and a natural finish in a balanced manner, the content of the non-polar oil may be 50-95% by mass, 60-80% by mass, or 65-75% by mass, based on the total amount of oily components.

[0079] Examples of semi-solid oils include petrolatum, tri(caprylic / capric / myristic / stearic acid) glyceryl, hexa(oleic / palmitic / stearic acid) sucrose, pentaerythritol rosinate, and cholesterol fatty acid esters.

[0080] From the viewpoint of improving adhesion to the skin and maintaining drop strength, the content of the above-mentioned semi-solid oil may be 0.1 to 8.0% by mass, 0.5 to 7.0% by mass, or 1.0 to 5.0% by mass, based on the total amount of oily components. The cosmetic base material of this embodiment may also not contain the above-mentioned semi-solid oil as other oily components.

[0081] Examples of solid oils include hydrocarbons such as paraffin wax, microcrystalline wax, and polyethylene; plant-derived oils such as hydrogenated castor oil, hydrogenated jojoba oil, carnauba wax, candelilla wax, candelilla wax hydrocarbons, sunflower seed wax, and rice wax; esters such as glyceryl tribehenate; higher alcohols such as stearyl alcohol and behenyl alcohol; silicones such as acrylic-modified silicones; and sugar fatty acid esters such as dextrin palmitate and inulin stearate.

[0082] From the viewpoint of maintaining drop strength, the content of the solid oil may be 0.1 to 5% by mass, 0.2 to 3% by mass, or 0.5 to 1% by mass, based on the total amount of oily components. The cosmetic base material of this embodiment may also not contain solid oil as other oily components.

[0083] From the perspective of improving the ease of picking up the appropriate amount, the spreadability, and the adhesion to the skin in a balanced manner, the content of oily components in the cosmetic base may be 4-40% by mass, 7-35% by mass, or 10-30% by mass, based on the total amount of the cosmetic base.

[0084] From the viewpoint of improving the balance between suppressing powder scattering, ease of picking up the appropriate amount, and adhesion to the skin, the content of semi-solid oil in the cosmetic base material, that is, the total content of semi-solid component (D) and semi-solid oils other than component (D), may be 1 to 6% by mass, 2 to 5.5% by mass, 3 to 5% by mass, or 4 to 4.5% by mass, based on the total amount of the cosmetic base material.

[0085] <Other ingredients> The cosmetic base in this embodiment may further contain additives commonly used in cosmetics, in addition to the components described above. Examples of additives include polyhydric alcohols, surfactants, antioxidants such as tocopherol, preservatives such as ethylparaben, methylparaben, and chlorphenesin, fragrances, and beauty ingredients. A low-HLB (e.g., HLB of 3-6) nonionic surfactant is preferred, and a sorbitan-based nonionic surfactant is more preferred. An example of a sorbitan-based nonionic surfactant is sorbitan sesquiisostearate.

[0086] Examples of polyhydric alcohols include dipropylene glycol, 1,3-butylene glycol, isopentyl diol, 1,2-pentanediol, 1,2-hexanediol, polyethylene glycol, glycerin, diglycerin, sorbitol, maltitol, and raffinose.

[0087] From the viewpoint of storage stability that can suppress the decrease in hardness even in high temperature and high humidity environments, the polyhydric alcohol content in the cosmetic base material is preferably less than 0.1% by mass, based on the total amount of the cosmetic base material, and may be 0.05% by mass or less, or 0.01% by mass or less. The cosmetic base material of this embodiment may not contain polyhydric alcohols.

[0088] Next, we will explain the dispersion medium contained in the slurry.

[0089] <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.

[0090] Examples of volatile solvents other than water include light liquid isoparaffin, ethyl alcohol, acetone, and isopropyl alcohol.

[0091] The water content in the dispersion medium may be 50-100% by mass, 80-100% by mass, or 100% by mass, based on the total amount of the dispersion medium.

[0092] Next, we will explain how to prepare the slurry.

[0093] <Preparation of Slurry> In step A, a slurry is prepared containing a cosmetic base material containing the above-mentioned components and a dispersion medium containing water. The slurry may be prepared by mixing a mixture of the components of the cosmetic base material with the dispersion medium, by adding the components of the cosmetic base material to the dispersion medium in a predetermined order, or by preparing two or more mixtures of some of the components of the cosmetic base material with the dispersion medium and mixing them together.

[0094] Mixing methods can include, for example, dispersers, homomixers, supermixers, Henschel mixers, atomizers, and the like.

[0095] In step A, heating may be performed and the slurry may be degassed as needed.

[0096] When mixing a mixture of components of a cosmetic base with a dispersion medium, step A may include, for example, the steps of: obtaining a first mixture by mixing components of the cosmetic base other than oily components (powder components, thickeners, and other components) in a predetermined proportion; and obtaining a second mixture by mixing oily components in a predetermined proportion.

[0097] The step of obtaining the first mixture can be carried out using, for example, a disper, homomixer, etc., and the oily components can be mixed while heating at 60-80°C, preferably 60-70°C.

[0098] The step of mixing the first mixture and the second mixture can be carried out using, for example, a super mixer or a Henschel mixer, and if necessary, grinding may be performed using an atomizer or the like.

[0099] The mixing ratio of the cosmetic base material and the dispersion medium may be 100:100 to 100:10 by mass, 100:100 to 100:40, or 100:100 to 100:80.

[0100] (Process B) Next, we will explain process B.

[0101] Step B may include the steps of filling a container with slurry and removing the dispersion medium from the slurry filled in the container and molding it.

[0102] Examples of suitable containers include metal plates, resin plates, and other types of inner dishes.

[0103] The step of removing the dispersion medium from the slurry filled in the container and molding it may, for example, involve removing the solvent after molding, molding after removing the solvent, or removing the solvent and molding simultaneously. A molding method may include, for example, compression molding using a suction compression molding machine. A solvent removal method may include, for example, drying using a hot air dryer or freeze dryer.

[0104] A solid powder cosmetic is obtained through the above-described steps A and B.

[0105] The solid powder cosmetic obtained by the method of this embodiment can be used as a makeup cosmetic such as face powder, foundation, eyeshadow, blush, eyebrow powder, and nose shadow.

[0106] The solid powder cosmetic obtained by the method of this embodiment can be applied to the skin or eyebrows using an applicator. Examples of applicators include brush-shaped, tip-shaped, puff-shaped, and brush-shaped devices.

[0107] [Solid powder cosmetics] The solid powder cosmetic of this embodiment is a solid powder cosmetic containing a powder component and an oily component, wherein the powder component comprises (A) plate-shaped powder containing alumina and (B) spherical powder, the solid powder cosmetic further comprises (C) a water-soluble thickener, and the oily component comprises (D) a water-retaining oil.

[0108] The solid powder cosmetic of this embodiment can be manufactured by the method for manufacturing the solid powder cosmetic of this embodiment described above, and can have excellent usability (less powder scattering and easy to take the appropriate amount), excellent finish (adhesion to the skin and a transparent finish), sufficient impact resistance, and sufficient storage stability.

[0109] The constituent components and their content of the solid powder cosmetic of this embodiment may be the same as those of the cosmetic base in the method for producing the solid powder cosmetic of this embodiment described above.

[0110] The solid powder cosmetic composition of this embodiment may have a hardness of 0.1 to 10 N, 0.5 to 5 N, or 1 to 3 N at 25°C, as measured using a load testing machine (rheometer, manufactured by Rheotec Co., Ltd.) under the following conditions. Measuring device: Rheometer (manufactured by Rheotech Co., Ltd.) [Measurement conditions] Adapter: φ1.0mm cylinder Penetration depth: 1.0mm Needle insertion speed: 2cm / min

[0111] The solid powder cosmetic of this embodiment can be used as a makeup cosmetic such as face powder, foundation, eyeshadow, blush, eyebrow powder, and nose shadow.

[0112] The solid powder cosmetic of this embodiment has excellent usability (less powder scattering and easy to pick up the appropriate amount), and can be applied to the skin or eyebrows using an applicator. Examples of applicators include brush-shaped, tip-shaped, puff-shaped, and brush-shaped devices. [Examples]

[0113] The present invention will be described in more detail below with reference to examples, but these examples do not limit the technical scope of the present invention. Unless otherwise specified, the values ​​in the table indicate the content (parts by mass) when the total amount of cosmetic base material is 100 parts by mass.

[0114] Prior to describing the examples, the evaluation methods used in each example will be explained.

[0115] (1) Sensory evaluation Ten cosmetic evaluation panel members were asked to apply samples of the solid powder cosmetics of the examples and comparative examples to their skin using a brush as the applicator. Each member evaluated the samples on a 5-point scale according to the following criteria, considering factors such as the absence of powder scattering, ease of adjusting the amount applied to the applicator, adhesion to the skin, transparency of the finish, and spreadability. The average score was then determined according to the following criteria. [Rating: Evaluation Criteria] 5 points: very good 4 points: Good 3 points: normal 2 points: Slightly poor 1 point: Defective [Evaluation Criteria (Average Score)] ◎: 4 or higher ○: 3 or more but less than 4 △: 2 or more but less than 3 ×: Less than 2

[0116] (2) Moldability For molded products that were compression-molded and dried, the presence or absence of cracks, peeling, fissures, etc., on the surface of the solid powder cosmetic samples was visually observed, and the level of occurrence was evaluated in stages according to the evaluation criteria below, with a score assigned to each sample. The average score for n=5 was then determined according to the following criteria. [Rating: Evaluation Criteria] 4 points: No change 3 points: Slight cracks, peeling, and fissures have been observed. 2 points: Cracks, peeling, fissures, etc. have been observed. 1 point: Cracks, peeling, fissures, etc. occur very frequently. [Evaluation Criteria (Average Score)] ◎: 3.5 or higher ○: 3.0 or higher and less than 3.5 △: 2.0 or higher, but less than 3.0 ×: Less than 2.0

[0117] (3) Impact resistance Samples of solid powder cosmetics were dropped five times from a height of 50 cm onto P-tiles with the contents facing upwards. The condition of each sample was then observed, and the occurrence of cracks, chips, crumbling, etc., was evaluated on a four-point scale according to the evaluation criteria below. A score was assigned to each sample, and the average score for n=5 was determined according to the following criteria. [Rating: Evaluation Criteria] 4 points: No change 3 points: Cracks are observed. 2 points: A chip has been found. 1 point: More than half of the structure has collapsed. [Evaluation Criteria (Average Score)] ◎: 3.5 or higher ○: 3.0 or higher and less than 3.5 △: 2.0 or higher, but less than 3.0 ×: Less than 2.0

[0118] (4) Storage stability Samples of solid powder cosmetics were stored for 4 weeks in a constant temperature chamber set to 40°C and 70% humidity. The hardness of the solid powder cosmetics before and after storage was measured using a load tester (rheometer, manufactured by Rheotech Co., Ltd.) under the following measurement conditions, and the average value for n=5 was calculated. Based on the percentage decrease in hardness after storage relative to the initial value ([(initial value) - (hardness after storage)] × 100 / (initial value)), the hardness before storage was used as the initial value, and a three-stage evaluation was made according to the following criteria. [Measurement conditions] Adapter: φ1.0mm cylinder Penetration depth: 1.0mm Needle insertion speed: 2cm / min Measurement temperature: 25℃ [Judgment criteria] ○: Hardness reduction rate is less than 10% △: Hardness reduction rate is 10% or more but less than 15% ×: Hardness reduction rate of 15% or more

[0119] (Examples 1-32, Comparative Examples 1-6) Solid powder cosmetics (face powders) with the compositions shown in Tables 1-5 were prepared using the following manufacturing method, and the above evaluations were performed. The results are also shown in Tables 1-5.

[0120] <Manufacturing method> The oily components were heated and mixed at 60-80°C to obtain mixture I. The cosmetic base materials other than the oily components (powdered components, thickeners, and other components) were uniformly dispersed in a Henschel mixer to obtain mixture II. Mixture I was added to II and uniformly dispersed in a Henschel mixer to obtain a cosmetic base. To 100 parts by mass of this cosmetic base, water was added as a solvent in the amounts listed in Tables 1-5, and the mixture was kneaded to form a slurry. After filling the slurry into a metal tray and compressing it, the water was removed by drying to produce a face powder.

[0121] [Table 1]

[0122] [Table 2]

[0123] [Table 3]

[0124] [Table 4]

[0125] [Table 5]

[0126] The details of each component in Tables 1-5 are as follows:

[0127] [Powdered ingredients] <(A) component> (A1) Alumina single crystal: Alumina single crystal (manufactured by Merck Performance Materials G.K., product name "RonaFlair® White Sapphire", average particle size approximately 8 μm) (A2) Alumina base pearl agent: Titanium oxide coated alumina pearl agent (manufactured by Merck KGaA, product name "Ronastar® Golden Lights", average particle size: 22.5 μm)

[0128] <(B) component> Spherical Silica 1: Cetanol-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: 5 μm, untreated)

[0129] <Other> Calcium carbonate: Calcium carbonate (plate-like, average particle size: 5 μm) Synthetic Fluorphlogopite 1: SA-treated synthetic fluorphlogopite (manufactured by Miyoshi Chemical Co., Ltd., average particle size: 10 μm) Synthetic Fluorphlogopite 2: Synthetic Fluorphlogopite (average particle size: 10 μm, untreated) Synthetic Fluorphlogopite 3: Synthetic Fluorphlogopite (average particle size: 20 μm, untreated) Amino acid treated mica: NAI-treated mica (manufactured by Miyoshi Chemical Co., Ltd., average particle size: approximately 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., product name "SA-Excel Mica JP-2", surface treatment agent 3% by mass) Boron nitride: Boron nitride (average particle size: 11 μm) Talc: Talc (average particle size: 6.5 μm) Silicone-treated talc: SA-treated talc (manufactured by Miyoshi Chemical Co., Ltd., average particle size: 6.5 μm) Silicone-treated colorant: (Manufactured by Miyoshi Kasei Co., Ltd.) Pearlescent agent: Mica-based pearlescent agent (average particle size: 26 μm)

[0130] [Thickener] <(C) component> Acrylic polymer 1: (Hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer (manufactured by SEPPIC SA, product name "SEPINOV EMT 10") Acrylic polymer 2: (Sodium acrylate / Sodium acryloyldimethyl taurate) copolymer (manufactured by SNF Co., Ltd., product name "FLOCARE PSD 30") Silicate (Al / Mg): Aluminum magnesium silicate

[0131] [Oily components] <(D) component> Water-retaining oil agent 1: Dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl) (semi-solid oil) (manufactured by Nippon Seika Co., Ltd., product name "Plandool-H") Water-retaining oil agent 2: Hydrogenated castor oil isostearate (semi-solid oil) (manufactured by National Mimatsu Co., Ltd., product name "Castride MIS-P") Water-retaining oil agent 3: Dimer dilinoleyl dimer dilinoleate bis(behenyl / isostearyl / phytosteryl) (semi-solid oil) (manufactured by Nippon Seika Co., Ltd., product name "Plandool-G") Water-retaining oil agent 4: Hexa(hydroxystearic acid / stearic acid / rosinic acid)dipentaerythrityl (semi-solid oil) (manufactured by Nisshin Oillio Group Ltd., product name "Cosmall 168ARV") Water-retaining oil agent 5: Di(isostearyl / phytosteryl) dimer dilinoleate (liquid oil, viscosity: 2300 mPa·s) (manufactured by Nippon Seika Co., Ltd., product name "LUSPLAN PI-DA")

[0132] <Other> Silicone oil 1: Dimethicone (viscosity: 100 mPa·s) Ester oil 1: Triethylhexanoin (viscosity: 31 mPa·s) Ester oil 2: Caprylic / capric triglyceride (viscosity: 30 mPa·s) Ester oil 3: Neopentyl glycol diethylhexanoate (viscosity: 12.5 mPa·s) Vaseline: Vaseline (semi-solid oil) (manufactured by Nikko Rica Co., Ltd., product name "Sunwhite (P-150)")

[0133] The viscosity of the liquid oil was measured according to the following measurement method. (Method for measuring viscosity) The viscosity of samples at 25°C was measured using a Brookfield viscometer (BM type) under the following conditions. The measurement time was 1 minute. 5-50 mPa·s: BM type, BL adapter, rotation speed 12 rpm 50-500 mPa·s: BM type, rotor No. 1, rotation speed 12 rpm 250-2500 mPa·s: BM type, rotor No. 2, rotational speed 12 rpm 1000~10000 mPa·s: BM type, rotor No. 3, rotation speed 12 rpm 5000~50000 mPa·s: BM type, rotor No. 4, rotational speed 12 rpm

[0134] [Other ingredients] Surfactant: Sorbitan sesquiisostearate (viscosity: 3900 mPa·s) Polyhydric alcohol: Glycerin

[0135] As shown in Tables 1-5, the solid powder cosmetics obtained in Examples 1-32 did not receive a "×" rating in any category, and it was confirmed that they could sufficiently suppress powder scattering when rubbed off with an applicator, and that they had sufficient adhesion to the skin, transparency of the finish, impact resistance, and storage stability.

[0136] (Example 33: Foundation) (Ingredients) (Percentage of ingredients by mass) 1. Alumina single crystal 20.00 2. Spherical silica 1 8.00 3. Spherical silica 2 4.00 4. Silica 1 2.00 5. Calcium carbonate 6.00 6.Synthetic phlogopite 1 remainder 7. Synthetic phlogopite 2 1.50 8. Silicone-treated aluminum hydroxide coated mica 5.00 9.Composite powder 5.00 10. Fine particle titanium dioxide 8.50 11. Zinc Oxide 5.00 12. Silicone-treated colorant 1.50 13. Titanium Oxide 4.00 14. Acrylic polymer 2 0.15 15. Water-retaining oil agent 1 4.00 16. Silicone oil 1 3.00 17. Ester oil 1 6.00 18. Surfactant 0.10 19. Antioxidant 0.02 20. Preservatives 0.20

[0137] The details of the above components are the same as those already described, except for the components listed below. [Powdered ingredients] Silica 1: Silicone-treated titanium oxide-encapsulated silica (average particle size: 4.5 μm) Composite powder: Titanium oxide silica alumina mica composite powder (manufactured by Merck KGaA, product name "Ronaflair® Softshade" (average particle size: 10 μm) (plate-shaped powder in which a mixture of titanium oxide, silica, and alumina is coated on the surface of mica) Fine particle titanium dioxide: Fine particle titanium dioxide (average particle size: 0.14 μm) Zinc oxide: Zinc oxide (average particle size: 1 μm) Titanium dioxide: Titanium dioxide (average particle size: 0.25 μm)

[0138] <Manufacturing method> The oily components were heated and mixed at 60-80°C to obtain mixture I. The cosmetic base materials other than the oily components (powdered components, thickeners, additives, and other components) were uniformly dispersed in a Henschel mixer to obtain mixture II. Mixture I was added to II and uniformly dispersed in a Henschel mixer to obtain a cosmetic base. 100 parts by mass of this cosmetic base was mixed with 100 parts by mass of water as a solvent, kneaded to form a slurry, then filled into a medium dish (metal dish), compressed and molded, and the water was removed by drying to produce a foundation.

[0139] <Rating> When the obtained foundation samples were evaluated in the same way as described above, it was confirmed that the samples received the following ratings: "No powder fallout, ease of picking up the right amount" was "◎", "Adhesion to the skin" was "○", "Transparency of finish" was "○", "Spreadability" was "○", "Moldability" was "◎", "Impact resistance" was "◎", and "Storage stability" was "○".

[0140] (Example 34: Eyeshadow) (Ingredients) (Percentage of ingredients by mass) 1. Alumina single crystal 2.00 2. Alumina matrix pearl agent 22.00 3. Spherical silica 1 8.00 4. Calcium carbonate 4.00 5.Synthetic phlogopite 1 remainder 6. Amino acid treated mica 16.77 7. Iron oxide 0.10 8. Pearl agent 28.00 9. Bentonite 4.50 10. Water-retaining oil agent 3 3.00 11. Water-retaining oil agent 5 3.00 12. Ester oil 2 7.00 13. Surfactant 0.10 14. Antioxidant 0.02 15. Preservative 0.20

[0141] The details of the above ingredients are the same as those already described above.

[0142] <Manufacturing method> Mixture I was obtained by heating and mixing the oily components at 60-80°C. The cosmetic base materials other than the oily components (powdered components, thickeners, additives, and other components) were uniformly dispersed in a Henschel mixer to obtain mixture II. Mixture I was added to II and uniformly dispersed in a Henschel mixer to obtain the cosmetic base. 100 parts by mass of this cosmetic base was mixed with 80 parts by mass of water as a solvent, kneaded to form a slurry, then filled into a medium dish (metal dish), compressed and molded, and the water was removed by drying to produce eyeshadow.

[0143] <Rating> When the obtained eyeshadow samples were evaluated in the same way as described above, it was confirmed that the samples received the following ratings: "No powder fallout, ease of picking up the right amount" was "◎", "Adhesion to the skin" was "○", "Transparency of finish" was "◎", "Spreadability" was "○", "Moldability" was "◎", "Impact resistance" was "◎", and "Storage stability" was "○".

Claims

1. A step of preparing a slurry containing a cosmetic base material containing powder components and oily components, and a dispersion medium containing water, The process involves filling the slurry into a container, removing the dispersion medium, and molding it. Equipped with, The powder component comprises (A) at least one plate-like powder selected from the group consisting of (A1) plate-like powder made of alumina single crystal and (A2) plate-like powder in which alumina surface is coated with a metal oxide, and (B) spherical powder. The cosmetic base further comprises (C) a water-soluble thickener. A method for producing a solid powder cosmetic, wherein the oily component includes (D) a water-retaining oil agent.

2. A method for producing a solid powder cosmetic according to claim 1, wherein the polyhydric alcohol content in the cosmetic base is less than 0.1% by mass, based on the cosmetic base.

3. A method for producing a solid powder cosmetic according to claim 1 or 2, wherein the content of component (D) in the cosmetic base is 50% by mass or less based on the total amount of the oily component.

4. A solid powder cosmetic composition containing powder components and oily components, The powder component comprises (A) at least one plate-like powder selected from the group consisting of (A1) plate-like powder made of alumina single crystal and (A2) plate-like powder in which a metal oxide is coated on the surface of alumina, and (B) spherical powder. The aforementioned solid powder cosmetic further comprises (C) a water-soluble thickener, The aforementioned oily component is a solid powder cosmetic containing (D) a water-retaining oil agent.

5. The solid powder cosmetic according to claim 4, wherein the content of polyhydric alcohol in the solid powder cosmetic is less than 0.1% by mass, based on the solid powder cosmetic.

6. The solid powder cosmetic composition according to claim 4 or 5, wherein the content of component (D) in the solid powder cosmetic composition is 50% by mass or less based on the total amount of the oily component.

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