JP2026031455A - Powdered solid cosmetics - Google Patents

Abstract

The present invention provides a powdery solid cosmetic product that has good impact resistance, a good feeling when used, and excellent color development, and a method for producing the same.
[Solution] A solid cosmetic powder comprising (A) wax powder; (B) powder components (excluding (A) wax powder); and (C) oil, wherein the (B) powder components contain (b1) nonporous silica, and the (C) oil components contain (c1) nonvolatile dimethicone having a viscosity of 10 cs or less in an amount of 15 to 50 mass % relative to the total amount of the cosmetic, and a method for producing the solid cosmetic powder using wet molding.
[Selection diagram] None

Description

The present invention relates to a solid cosmetic powder. More specifically, it relates to a solid cosmetic powder that has excellent usability and impact resistance, and also has good color development, and a method for producing the same.

Solid powder cosmetics have a structure in which powder ingredients are solidified with a primarily oily binder, and are commonly used as a dosage form for makeup cosmetics such as foundation and eye shadow. In recent years, solid powder cosmetics have been required to not only meet basic cosmetic performance requirements such as makeup effect and long-lasting makeup, but also to have excellent product performance such as impact resistance and mass production, as well as excellent usability (feel) such as ease of removal from containers and high flexibility during use.

Patent Document 1 describes a solid cosmetic that contains (A) an oil that is liquid at room temperature, (B) a powder, (C) a partially crosslinked organopolysiloxane polymer, and (D) a dextrin fatty acid ester of a specific structure, with the mass ratio of (A) to (B) adjusted to fall within a specified range, and that possesses high elasticity, uniformity of the cosmetic film, impact resistance, etc.

However, when a silicone elastomer powder such as the partially crosslinked organopolysiloxane polymer (C) described in Patent Document 1 is blended into a powder solid cosmetic product, the color development of the cosmetic product tends to decrease. On the other hand, reducing the amount of silicone elastomer powder to improve color development poses the problem of a significant decrease in the impact resistance of the cosmetic product.

Powdered solid cosmetics are generally produced using either a molding method (dry molding), in which the powder is filled into a tray and pressed in a mold to harden, or a method (wet molding), in which a solvent is added to the raw material to form a slurry, which is filled into a tray, pressed, and then dried and evaporated to form the product. The solid cosmetic product in Patent Document 1 is described as being suitable for production using the dry molding method (paragraph 0059).

The wet molding method has the advantage that, because the raw materials are filled into the inner tray in a slurry state, it can be stably molded regardless of the shape of the inner tray, and can produce a cosmetic product with a soft feel when used. However, a heat drying process is required to remove the solvent added to form the slurry, making the process more complicated than the dry molding method, and therefore not suitable for mass production in some cases.

In conventional wet molding, volatile solvents such as water, lower alcohols, or volatile hydrocarbons are commonly used to form the slurry, and the solvent is removed by a heat drying process after suction pressing. In recent years, there have been examples of using non-volatile oils (silicone oils) as the solvent for forming the slurry in wet molding (Patent Document 2). In the manufacturing method of Patent Document 2, the solvent is removed in liquid form by being absorbed by an absorbent (paper or nonwoven fabric) pressed against the opening of the container. However, Patent Document 3 states that the manufacturing method of Patent Document 2 results in insufficient solvent removal, and that the solvent (non-volatile silicone oil) remaining in the molded cosmetic material may degrade the quality of the cosmetic material. Patent Document 3 claims that blending a specific non-volatile hydrocarbon oil with the oil that makes up the cosmetic material makes it easier to remove the solvent (non-volatile silicone oil). However, the cosmetics in Patent Documents 2 and 3 contain wax and are manufactured through a heating process to dissolve (melt) the wax. However, heating causes another problem: the oil becomes cloudy and the color development is reduced.

JP 2016-190838 A Japanese Patent Application Laid-Open No. 2007-291074 WO2022/220027

The present invention aims to provide a powdered solid cosmetic product that has good impact resistance, a pleasant feel when used, and excellent color development, as well as a method for producing said cosmetic product using a wet molding method.

As a result of extensive research aimed at solving the above-mentioned problems, the inventors discovered that a powdered solid cosmetic product formulated to contain a powdered wax, an oil containing a specified amount of non-volatile dimethicone, and non-porous silica powder has good impact resistance and a pleasant feel when used, and also has excellent cosmetic appearance and color development after application, leading to the completion of the present invention.

That is, the present invention provides:
(A) wax powder;
(B) powder components (excluding (A) wax powder); and (C) oil components,
The (B) powder component contains (b1) nonporous silica,
The present invention provides a solid cosmetic in powder form, characterized in that the (C) oil component contains (c1) non-volatile dimethicone having a viscosity of 10 cs or less in an amount of 15 to 50% by mass relative to the total amount of the cosmetic.

In the solid cosmetic powder preparation of the present invention, the nonporous silica powder does not excessively absorb oil, allowing a large amount of oil to remain unconstrained, while the lipophilicity of the wax powder allows the oil to be appropriately retained within the cosmetic preparation. Therefore, the solid cosmetic powder preparation of the present invention spreads well upon application, has a moist feel, and also has excellent impact resistance and color development.

The solid cosmetic in powder form of the present invention (hereinafter simply referred to as "cosmetic") contains (A) wax powder, (B) powder component (excluding (A) wax powder), and (C) oil. The (B) powder component contains (b1) nonporous silica, and the (C) oil component contains a predetermined amount of (c1) nonvolatile dimethicone.

(A) Wax Powder The wax powder (A) (hereinafter also referred to as "Component A") in the cosmetic of the present invention is a powdery wax. The wax powder (Component A) can be produced by a method of mechanically pulverizing a wax that is solid at room temperature (25°C), or by a method of dissolving the wax in a volatile solvent and spray-drying it. Examples of methods for mechanically pulverizing wax include methods using pulverizing devices such as a jet mill, hammer mill, pin mill, ball mill, and bead mill.

The wax that constitutes the wax powder (Component A) preferably has a melting point of 40 to 200°C, preferably about 85 to 125°C, and has low compatibility with non-volatile dimethicone. Specific examples include synthetic wax, beeswax, carnauba wax, candelilla wax, montan wax, paraffin wax, ozokerite, ceresin, microcrystalline wax, polyethylene wax, ethylene-propylene copolymer wax, Fischer-Tropsch wax, sunflower seed wax (sunflower wax), rice bran wax, Japan wax, hydrogenated jojoba oil, behenyl behenate, glyceryl tribehenate, jojoba ester, etc. Among these, hydrocarbon waxes such as synthetic wax, polyethylene wax, ethylene-propylene copolymer wax, paraffin wax, Fischer-Tropsch wax, and microcrystalline wax are preferred.

The average particle size of the wax powder (component A) used in the cosmetic of the present invention is not particularly limited, but is generally preferably in the range of 0.1 to 50 μm, more preferably 5 to 40 μm, and even more preferably 6 to 25 μm.
As component A of the cosmetic of the present invention, one type of wax powder may be used alone, or two or more types of wax powder may be used in combination.

Commercially available wax powders (Component A) may be used. Examples include PRESS-AID-SP (synthetic wax; average particle size 6-7.5 μm) and PRESS-AID-XP (synthetic wax; average particle size 3 μm) manufactured by PRESPERSE, PE wax manufactured by SHAMROCK, carnauba wax powder manufactured by Cerarica NODA Co., Ltd., and polishing wax (carnauba wax) and lubriwax (hydrogenated castor oil or hydrogenated rapeseed oil) manufactured by Freund Corporation.

Unless otherwise specified, the average particle size of powders in this specification refers to the volume average particle size (D50) measured by adding the powder to a solvent such as ethanol, ultrasonically dispersing it for 1 minute using an ultrasonic homogenizer (US-150T; manufactured by Nippon Seiki Seisakusho), and then measuring it using a laser diffraction/scattering particle size distribution analyzer (MT3300EXII; manufactured by Microtrac Bell Co., Ltd.).

The amount of wax powder (Component A) in the cosmetic of the present invention is preferably 1% by mass or more, more preferably 2.5% by mass or more, and even more preferably 4% by mass or more, based on the total amount of the cosmetic. If the amount is less than 1% by mass, sufficient impact resistance may not be obtained. The amount of wax powder (Component A) can be in the range of, for example, 1 to 20% by mass, 2 to 15% by mass, or 3 to 10% by mass.

(B) Powder Component The (B) powder component (also referred to as "component B") blended in the cosmetic of the present invention is a powder component that constitutes a powder solid cosmetic product. However, this does not include a component that corresponds to (A) wax powder.
The powder component (B) in the present invention contains (b1) nonporous silica (also referred to as "component b1") as an essential component.

The non-porous silica (b1) in the present invention is a powder made of silica (silicic anhydride) and is a non-porous powder. In this specification, "non-porous" refers not only to a solid powder (particle) having no "pores" at all, but also to a silica powder having a smaller number of "pores" than the general "porous silica" used in cosmetics, and is distinguished from "porous silica" in its "specific surface area" and/or "oil absorption capacity."
In other words, the "nonporous silica" that is the component (b1) of the present invention can be defined as a silica powder that satisfies either or both of the following conditions: (Condition 1) the specific surface area is 50 ^m2 /g or less, and (Condition 2) the oil absorption is 50 mL/100 g or less.

The non-porous silica (component b1) used in the present invention may be any silica powder that satisfies either or both of the above-mentioned conditions 1 and 2. Among these, silica powder having a specific surface area of 30 m ² /g or less is preferred, more preferably 20 m ² /g or less, and even more preferably 10 m ² /g or less, for example, a silica powder having a specific surface area of less than 10 m ² /g or 8 m ² /g or less.
The specific surface area can be calculated by measuring the amount of nitrogen adsorbed to silica at 77K and analyzing it by the BET method.

The nonporous silica (component b1) used in the present invention preferably has an oil absorption of 50 mL/100 g or less, more preferably 30 mL/100 g or less, for example, 25 mL/100 g or less or 20 mL/100 g or less.

The "oil absorption" in this specification is a value measured in accordance with JIS K5101-13-2:2004 (boiled linseed oil method). Specifically, it can be roughly determined by the following method.
A 1.5g sample of silica powder is placed on a piece of wrapping paper and transferred to a glass measuring plate. Next, squalane is dropped onto the sample from a burette, 4 or 5 drops at a time, and each time, the whole is thoroughly kneaded with a palette knife. This dropping and kneading process is repeated until the whole becomes a hard putty-like mass, and each drop is kneaded together until the last drop can be wound into a spiral shape with a palette knife. This is the end point, and the oil absorption per 100g of sample is calculated using the following formula.
Oil absorption amount (mL/100g) = (A/W) x 100
(A represents the amount of squalane dropped (mL), and W represents the amount of sample collected (g))

As the nonporous silica (component b1) in the present invention, it is particularly preferable to use spherical nonporous silica powder. The use of spherical nonporous silica further improves the usability of the cosmetic. "Spherical powder" refers to powder with a spherical or nearly spherical outer shape, with a ratio of the major axis to the minor axis of 1.2 or less.
The average particle size of the non-porous silica (component b1) in the present invention is preferably about 1 to 20 μm, more preferably 2 to 15 μm.

Commercially available products may be used as the nonporous silica (component b1). Examples of commercially available products that satisfy both of the above (Condition 1) and (Condition 2) include CHIFFONSIL P-3R (average particle size: approximately 7 μm; oil absorption: 20 mL/100 g; specific surface area: 1.1 to 5.2 m ² /g) and CHIFFONSIL-5 (average particle size: approximately 5 μm; oil absorption: less than 20 mL/100 g; specific surface area: 2 m ² /g) (both manufactured by JGC Catalysts and Chemicals, Ltd.).

The amount of nonporous silica (component b1) in the cosmetic of the present invention is preferably 2 to 15% by mass, more preferably 2.5 to 12% by mass, and even more preferably 3 to 10% by mass, based on the total amount of the cosmetic. If the amount of nonporous silica (component b1) is less than 2% by mass, the usability of the molded cosmetic may be poor.

The powder components (component B) blended into the cosmetic of the present invention, other than nonporous silica (component b1) (also referred to as "other powders" or "component b2"), are not particularly limited as long as they are those commonly used in powder solid cosmetics. Examples of other powders (component b2) include extender pigments, colorants (including inorganic pigments (white pigments, colored pigments) and organic pigments), pearlescent agents, UV scattering agents, other inorganic powders and organic powders, etc.

Specific examples of other powders (component b2) include, but are not limited to, the following:
Examples of extender pigments include talc, kaolin, sericite, muscovite, phlogopite, synthetic mica, synthetic fluorine phlogopite, lepidolite, biotite, calcined talc, calcined sericite, calcined muscovite, calcined phlogopite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, magnesium, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (e.g., zinc myristate, calcium palmitate, aluminum stearate, etc.), photochromic titanium oxide (titanium dioxide obtained by sintering iron oxide), and reduced zinc oxide.

Coloring materials include inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., red iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., gamma-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, ochre, etc.); inorganic black pigments (e.g., black iron oxide, low-order titanium oxide, etc.); inorganic purple pigments (e.g., mango violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); natural pigments ( Examples include chlorophyll, beta-carotene, etc.); organic pigments (for example, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1, etc.).

Examples of pearlescent agents include bismuth oxychloride, fish scale foil, titanium mica, iron oxide-coated titanium mica, low-order titanium oxide-coated titanium mica; and metal powder pigments (for example, aluminum powder, copper powder, etc.).
Examples of ultraviolet scattering agents include fine particle titanium oxide and fine particle zinc oxide.

Examples of other inorganic powders include silica (silicic anhydride) other than nonporous silica (component b1) and organically modified clay mineral powder. However, in order to maintain good impact resistance and usability, the cosmetic of the present invention preferably does not contain porous silica powder (specific surface area exceeding 50 ^m2 /g and oil absorption exceeding 50 mL/100 g), or the amount blended is preferably less than 2 mass%. Furthermore, when flaky silica powder is blended, the amount blended is preferably 2 mass% or less of the total amount of the cosmetic.
Examples of organic powders include polyamide resin powder (nylon powder), polyethylene powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder, and polytetrafluoroethylene powder.

The other powder (component b2) preferably contains an extender pigment, a colorant, and a pearling agent. While not particularly limited, the amount of extender pigment is typically 10-50% by mass, and preferably 15-40% by mass, of the total cosmetic. The amount of colorant is typically 1-15% by mass, and preferably 3-10% by mass, of the total cosmetic. The amount of pearling agent is typically 5-40% by mass, and preferably 10-30% by mass, of the total cosmetic.

The cosmetic of the present invention contains (A) wax powder and (b1) nonporous silica, which provide good impact resistance and a pleasant feel when used. Therefore, there is no need to add silicone elastomer powder, which has been added to conventional solid powder cosmetics to improve impact resistance. Furthermore, the addition of silicone elastomer powder tends to reduce color development. Therefore, when the cosmetic of the present invention contains silicone elastomer powder, the amount of silicone elastomer powder added is less than 2% by mass or less than 1% by mass of the total cosmetic, and the cosmetic of the present invention also includes embodiments in which the amount of silicone elastomer powder added is less than 2% by mass or less than 1% by mass of the total cosmetic.

(C) Oil The oil (also referred to as "Component C") blended in the cosmetic of the present invention contains (c1) non-volatile dimethicone having a viscosity of 10 cs or less.
"Non-volatile dimethicone with a viscosity of 10 cs or less" (also referred to as "component c1") is a dimethicone (polydimethylsiloxane) that is liquid at room temperature (25°C) and is a non-volatile silicone oil whose viscosity (kinematic viscosity) is 10 cs (centistokes) or less. In this specification, "non-volatile" means that the volatile content is 5% or less when left at 105°C under atmospheric pressure for 3 hours. Here, "volatile content" refers to the value of the weight change rate (rate of reduction due to volatilization) when a filter paper is placed on a glass petri dish, about 0.2 g of sample is dropped on it, and the weight is measured by a gravimetric method. In contrast, a volatile content of more than 5% measured under the same conditions is considered "volatile."

The non-volatile dimethicone (ingredient c1) used in the present invention is a dimethicone with a viscosity of 10 cs or less, preferably 8 cs or less, and more preferably about 6 cs, and is preferably a linear dimethicone. There is no particular lower limit for the viscosity as long as it is "non-volatile," but it is usually 6 cs or more.

The amount of non-volatile dimethicone (ingredient c1) in the cosmetic of the present invention is 15 to 50% by mass, preferably 20 to 45% by mass, and more preferably 30 to 40% by mass, based on the total amount of the cosmetic. If the amount of non-volatile dimethicone is less than 15% by mass or more than 50% by mass, impact resistance or usability will decrease.

The oil (ingredient C) used in this invention, which is a non-volatile oil other than non-volatile dimethicone (ingredient c1), is not particularly limited as long as it is one that can be used in general cosmetics, but it is preferable to incorporate (c2) a non-silicone oil that is liquid at room temperature (25°C) (referred to as a "non-silicone liquid oil" or "ingredient c2").

Non-silicone liquid oils (component c2) include, for example, cetyl octanoate, cetyl ethylhexanoate, isodecyl pivalate (isodecyl neopentanoate), hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, isopropyl myristate, 2-hexyldecyl myristate, myristyl myristate, octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, stearyl Butyl phosphate, Isocetyl stearate, Isocetyl isostearate, Decyl oleate, Dodecyl oleate, Oleyl oleate, Myristyl lactate, Cetyl lactate, Diisostearyl malate, Cholesteryl 12-hydroxystearate, Castor oil fatty acid methyl ester, 2-Ethylhexyl succinate, Diisobutyl adipate, 2-Hexyldecyl adipate, Di-2-heptylundecyl adipate, Diisopropyl sebacate, Di-2-ethylhexyl sebacate, Ethylene di-2-ethylhexanoate Glycol, neopentyl glycol dicaprate, neopentyl glycol dioctanoate, acetoglyceride, glycerin di-2-heptylundecanoate, glycerin trioctanoate, glycerin tri-2-ethylhexanoate, glycerin trimyristate, glycerin triisopalmitate, glycerin tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetraoctanoate, tetra-2-ethyl Examples of suitable oils include, but are not limited to, ester oils such as pentaerythritol hexanoate; hydrocarbon oils such as liquid paraffin, squalane, and polybutene; and liquid oils such as avocado oil, evening primrose oil, camellia oil, macadamia nut oil, sunflower oil, almond oil, corn oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, and germ oil.

The amount of non-silicone liquid oil (component c2) in the cosmetic of the present invention is typically 1 to 20% by mass, preferably 1 to 15% by mass, and more preferably 1 to 10% by mass, based on the total amount of the cosmetic.

The cosmetic composition of the present invention may contain non-volatile silicone oils other than non-volatile dimethicone (component c1) (referred to as "other non-volatile silicone oils" or "component c3"). Examples of other non-volatile silicone oils (component c3) include linear polysiloxanes such as dimethylpolysiloxane (dimethicone; provided that the viscosity exceeds 10 cs), methylphenylpolysiloxane, and diphenylpolysiloxane, as well as various modified polysiloxanes such as amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, and fluorine-modified polysiloxanes. When other non-volatile silicone oils (component c3) are incorporated into the cosmetic composition of the present invention, the amount of the other non-volatile silicone oils (component c3) is preferably less than that of the non-volatile dimethicone (component c1). The amount of the other non-volatile silicone oils (component c3) relative to the total amount of the cosmetic composition is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less. The cosmetic preparation of the present invention includes embodiments that do not contain other non-volatile silicone oils (component c3).

In addition to the non-volatile oils described above, the cosmetic composition of the present invention may also contain a volatile oil (component c4). Examples of volatile oils (component c4) include hydrocarbon oils with low boiling points (e.g., boiling points of 200°C or less), such as isododecane, isohexadecane, and light liquid isoparaffin, as well as low boiling point chain or cyclic silicone oils, such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane. However, formulations containing a volatile oil (component c4) pose limitations, such as the need to use an airtight container for the molded cosmetic composition. Therefore, the amount of volatile oil (component c4) in the molded cosmetic composition is preferably less than 5% by mass, more preferably 3% by mass or less, and even more preferably 1% by mass or less, of the total amount of the cosmetic composition. The cosmetic composition of the present invention also includes embodiments that do not contain a volatile oil (component c4).

The oil component (component C) of the cosmetic of the present invention may contain a substance that thickens liquid oil (an "oil thickener" or "oil gelling agent"), such as a dextrin fatty acid ester. However, when the cosmetic of the present invention is produced using a wet molding method (using non-volatile dimethicone as the solvent), the inclusion of a dextrin fatty acid ester may reduce solvent removal, making molding difficult during mass production, and the molded cosmetic tends to become soft. Therefore, the cosmetic of the present invention preferably contains less than 1% by mass of the dextrin fatty acid ester, and more preferably less than 0.5% by mass. The cosmetic of the present invention also includes embodiments that do not contain a dextrin fatty acid ester.

In addition to the essential components (A) wax powder, (B) powder component, and (C) oil component described above, the cosmetic of the present invention may contain other optional components that can be blended into a solid cosmetic in powder form, within a range that does not impair the effects of the present invention.
Examples of other optional ingredients include, but are not limited to, surfactants, ultraviolet absorbers, moisturizers, antioxidants, preservatives, various drugs, and fragrances.

The cosmetic of the present invention contains a powdered wax. This wax powder (component A) maintains its powdery form even after molding, and works in conjunction with the co-formulated nonporous silica (component b1) and oil (component C) to exhibit excellent impact resistance and a pleasant feel when used. Therefore, it is preferable that the manufacturing process for the cosmetic of the present invention does not include a step of heating the wax powder (component A) to a temperature above the melting point. In other words, the cosmetic of the present invention is suitable for manufacturing using wet molding, which does not include a heating step.

Therefore, the present invention provides:
(1) a step of mixing (A) a wax powder, (B) a powder component containing (b1) non-porous silica, and (C) a raw material composition containing an oil component with (c1) a non-volatile dimethicone having a viscosity of 10 cs or less to form a slurry; and (2) a step of filling the slurry into a container and compression-molding the slurry while removing a portion of the (c1) non-volatile dimethicone.
The present invention provides a method for producing a powdery solid cosmetic product, comprising:

In the manufacturing method of the present invention, the (A) wax powder, (B) powder component (including (b1) nonporous silica), (C) oil, and (c1) nonvolatile dimethicone having a viscosity of 10 cs or less are as described above.

In the manufacturing method of the present invention, first, raw materials including (A) wax powder, (B) powder component, and (C) oil are mixed to prepare a raw material composition (raw material preparation step). The (B) powder component contains (b1) nonporous silica. The (C) oil component preferably contains (c2) non-silicone liquid oil and further contains (c1) non-volatile dimethicone having a viscosity of 10 cs or less. The blending amounts of each component are within the ranges described above for the cosmetic preparation.
The raw material preparation step can be carried out using, for example, a device such as a Henschel mixer (registered trademark) or a pulverizer.

Next, a solvent is added to the prepared raw material composition and mixed to form a slurry (slurry formation step).
Specifically, the solvent and the raw material composition are mixed/dispersed in an apparatus such as a disper mixer, a homogenizer, a planetary mixer, a Combimix (registered trademark), an Ajihomo mixer, or a twin-screw kneader.

As the solvent used in the slurry formation step, (c1) non-volatile dimethicone having a viscosity of 10 cs or less is used.
The solvent may contain a volatile solvent such as water, a lower alcohol, a volatile silicone oil, or a volatile hydrocarbon oil. However, since the remaining volatile solvent may affect the properties of the cosmetic after molding, a heat drying step may be required to completely remove the volatile solvent. Therefore, in the manufacturing method of the present invention, it is preferable that the solvent used in the slurry formation step consists solely of (c1) non-volatile dimethicone having a viscosity of 10 cs or less.

The blending ratio (mass ratio) of the solvent to the raw material composition in the slurry formation process is preferably solvent (mass)/raw material composition (mass) within the range of 1/2 to 3/2, and more preferably 7/10 to 11/10.

In the production method of the present invention, the slurry obtained in the slurry formation step is filled into a container and compression molded while removing the solvent (compression molding step).
The method for carrying out the compression molding step is not particularly limited, and any known method can be used. For example, the cosmetic of the present invention is obtained by filling the slurry into a container such as a metal or resin tray by injection filling or the like, and then compression molding while removing the solvent from the filled slurry by suction or absorption.

In the compression molding process, it is preferable to adjust the conditions for solvent removal and compression so that at least a portion of the solvent (c1) non-volatile dimethicone remains in the molded cosmetic. By using the manufacturing method of the present invention, the heat drying step for removing the solvent is unnecessary, simplifying the process. Therefore, the manufacturing method of the present invention is suitable for mass-producing the cosmetic of the present invention.

The cosmetic composition of the present invention is a powdery solid cosmetic composition that has excellent impact resistance and color development, is highly elastic, and has a moist feel when used, and can be provided in the form of makeup cosmetics such as foundation, eye shadow, blush, body powder, perfume powder, baby powder, pressed powder, deodorant powder, face powder, highlighter, bronzer, etc.

The present invention will be explained in more detail below using specific examples, but the present invention is not limited to the following examples. Furthermore, unless otherwise specified, the blending amounts in the following examples are expressed as % by mass relative to the total amount of the cosmetic.

The powder solid cosmetics (eye shadow) of Examples 1 to 4 and Comparative Examples 1 to 3 shown in Tables 1 and 2 below were prepared by wet molding using non-volatile dimethicone (Silicone KF-96A-6T (Shin-Etsu Chemical Co., Ltd.)) as a solvent. Comparative Example 4 was prepared using a dry method that includes a heating step above the melting temperature of the wax (95-100°C).

The impact resistance and color development of each cosmetic example were evaluated. The evaluation methods and criteria are as follows. The evaluation results for each cosmetic example are shown in Tables 1 and 2.

(1) Impact Resistance After vibration was applied to each cosmetic material, the appearance of the cosmetic material was visually observed and evaluated according to the following criteria.
<Evaluation criteria>
A+: No change was observed in the appearance of the cosmetic. A: Almost no change was observed in the appearance of the cosmetic. B: A slight change was observed in the appearance of the cosmetic, but this does not pose any practical problems. C: Liquefaction was observed in part of the cosmetic. D: The entire cosmetic liquefied, and the appearance changed significantly.

(2) Color Development Each cosmetic sample was applied to the inner arm of a subject, and the color development was evaluated by visual observation after use according to the following criteria.
<Evaluation criteria>
A: Excellent color development B: Average (same as conventional eyeshadow)
C: Poor color development

As shown in Tables 1 and 2, the cosmetics of Examples 1 to 4, which contained wax powder (component A) and nonporous silica (component b1), had sufficient impact resistance and excellent color development. On the other hand, Comparative Examples 1 and 2, which contained neither wax powder (component A) nor nonporous silica (component b1), had extremely low impact resistance. Comparative Example 3, in which the nonporous silica (component b1) in Example 1 was replaced with porous silica (oil absorption = 150 mL/100 g; specific surface area = 300 ^m2 /g), also failed to provide sufficient impact resistance. Furthermore, Comparative Example 4, which contained wax that had been heated and melted during the manufacturing process, had sufficient impact resistance, but the entire cosmetic became cloudy and had poor color development.

Claims (6)

(A) wax powder;
(B) powder components (excluding (A) wax powder); and (C) oil components,
The (B) powder component contains (b1) nonporous silica,
A solid cosmetic in powder form, characterized in that the (C) oil component contains (c1) non-volatile dimethicone having a viscosity of 10 cs or less in an amount of 15 to 50% by mass relative to the total amount of the cosmetic. The cosmetic according to claim 1, wherein the blending amount of the wax powder (A) is 1% by mass or more based on the total amount of the cosmetic. 2. The cosmetic preparation according to claim 1, wherein the nonporous silica (b1) is a spherical silica powder that satisfies either or both of the following conditions: (1) a specific surface area of 50 m ² /g or less, and (2) an oil absorption of 50 mL/100 g or less. The cosmetic according to claim 1, wherein the blending amount of (b1) nonporous silica is 2 to 15 mass% of the total amount of the cosmetic. (1) a step of mixing (A) a wax powder, (B) a powder component containing (b1) non-porous silica, and (C) a raw material composition containing an oil component with (c1) a non-volatile dimethicone having a viscosity of 10 cs or less to form a slurry; and (2) a step of filling the slurry into a container and compression-molding the slurry while removing a portion of the (c1) non-volatile dimethicone.
2. The method for producing the solid cosmetic preparation in powder form according to claim 1, comprising: The manufacturing method described in claim 5 does not include the step of (A) heating to a temperature above which the wax powder melts.