Powdered solid cosmetic

Abstract

The purpose of the present invention is to provide: a powdered solid cosmetic which has a feeling of use having excellent elasticity, can be produced using a wet molding method involving a simple process, and is suitable for mass production; and a method for producing same. The present invention relates to a powdered solid cosmetic characterized by: containing (A) 0.5-6 mass% of a silicone elastomer, (B) a powder component, and (C) an oil component; the powder component (B) including silica; and the oil component (C) containing (c1) non-volatile dimethicone having a viscosity of 10 cs or less at a quantity of 25-50 mass% relative to the total amount of the cosmetic. The present invention also relates to a method for producing the powdered solid cosmetic by using a wet molding method in which non-volatile dimethicone having a viscosity of 10 cs or less is used as a solvent.

Description

Powdered solid cosmetics

[0001] The present invention relates to a solid cosmetic product in powder form. More specifically, the present invention relates to a solid cosmetic product in powder form that has excellent elasticity and usability, and that is suitable for mass production by a manufacturing method using wet molding (shaping).

[0002] Solid cosmetic powders have a structure in which powder components are solidified with a mainly oily binder, and are widely used as a dosage form for makeup cosmetics such as foundation, eye shadow, etc. In recent years, solid cosmetic powders have been required to have not only basic cosmetic properties such as makeup effect and long-lasting makeup, but also excellent product properties such as impact resistance and mass productivity, and ease of use such as ease of removal from containers and high flexibility during use.

[0003] For example, Patent Document 1 describes that a solid cosmetic preparation containing (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, in which the mass ratio of (A) to (B) is adjusted within a predetermined range, has high elasticity, uniformity of the cosmetic film, impact resistance, etc.

[0004] Powder 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 and pressed, followed by drying and evaporating the solvent to form a mold. The solid cosmetic of the aforementioned Patent Document 1 is described as being suitable for production using the dry molding method because it contains a volatile oil blended in order to dissolve (D) the dextrin fatty acid ester and improve the uniformity of the cosmetic film, etc. (paragraphs 0015 and 0059).

[0005] The wet molding method has the advantage that because the inner tray is filled with the slurry, stable molding can be achieved regardless of the shape of the inner tray, and a cosmetic product with a soft feel can be obtained. However, the wet molding method requires a (heated) drying step to remove the solvent added to form the slurry, and the process is more complicated than the dry molding method, making it unsuitable for mass production in some cases.

[0006] In conventional wet molding methods, volatile solvents such as water, lower alcohols, or volatile hydrocarbons are commonly used as the solvent for forming the slurry, and the solvent is removed by heat drying after suction pressing. Meanwhile, there is an example of wet molding using a non-volatile oil (silicone oil) as the solvent for forming the slurry to produce a solid powder cosmetic containing a large amount of organic layered powder with excellent brilliance (Patent Document 2). In Patent Document 2, the solvent is removed in liquid form by absorbing it into an absorbent (paper or nonwoven fabric) pressed against the opening of the container. However, the manufacturing method of Patent Document 2 requires strict adjustment of the blending amounts of the organic layered powder and the oil (other than the solvent) to achieve the desired effect. Furthermore, Patent Document 2 states that if the solvent (non-volatile silicone oil) remains in the molded cosmetic, it may degrade the quality of the cosmetic (Patent Document 3, paragraph 0004). Patent Document 3 proposes using a specific non-volatile hydrocarbon oil as the oil component of the cosmetic to facilitate removal of the solvent (non-volatile silicone oil). It should be noted that the cosmetics of Patent Documents 2 and 3 contain wax, and therefore their production requires a heating step to melt (dissolve) the wax.

[0007] JP 2016-190838 A JP 2007-291074 A WO2022 / 220027 specification

[0008] The present invention aims to provide a solid cosmetic in powder form that has excellent elasticity and texture when used, can be produced using a simple wet molding method, and is suitable for mass production, and a method for producing the same.

[0009] As a result of extensive research into solving the above-mentioned problems, the present inventors discovered that a powder solid cosmetic preparation containing predetermined amounts of silicone elastomer, powder, and oil, wherein the powder contains silica and the oil contains a predetermined amount of non-volatile dimethicone, has an excellent elastic feel when used, and furthermore, can be produced in a simple process by employing a wet molding method using non-volatile dimethicone as a solvent for forming a slurry, thereby completing the present invention.

[0010] That is, the present invention provides a solid cosmetic in powder form, comprising: (A) a silicone elastomer in an amount of 0.5 to 6% by mass relative to the total amount of the cosmetic; (B) a powder component; and (C) an oil component, wherein the (B) powder component contains silica; and the (C) oil component contains 25 to 50% by mass relative to the total amount of the cosmetic of non-volatile dimethicone having a viscosity of 10 cs or less.

[0011] The present invention further provides a method for producing the solid cosmetic in powder form, comprising: (1) a step of mixing (A) a silicone elastomer, (B) a powder component containing (b1) silica, and (C) a raw material composition containing an oil 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.

[0012] The solid cosmetic preparation in powder form of the present invention contains a predetermined amount of silicone elastomer and a well-balanced blend of oil containing non-volatile dimethicone and powder containing oil-absorbing silica, resulting in a soft and elastic feel when used and excellent impact resistance. Furthermore, the high blended amount of oil allows the high-brightness powder and coloring materials to easily adhere to the skin, resulting in a cosmetic preparation with an excellent finish.

[0013] Furthermore, the method for producing a solid cosmetic product in powder form according to the present invention allows production in such a way that a portion of the non-volatile dimethicone used as a solvent for forming the slurry remains in the cosmetic product after molding, eliminating the need for a heat drying step to remove the solvent, simplifying the production process and making it suitable for mass production.

[0014] <Solid Cosmetic in Powder> One aspect of the present invention is a solid cosmetic in powder form (hereinafter also simply referred to as "cosmetic"), which contains (A) a silicone elastomer, (B) (b1) a powder component containing silica, and (C) (c1) an oil component containing non-volatile dimethicone having a viscosity of 10 cs or less.

[0015] (A) Silicone Elastomer The silicone elastomer (also referred to as "Component A") used in the cosmetic of the present invention is not particularly limited as long as it is usable in cosmetics, and can be selected from emulsifying or non-emulsifying silicone elastomers. Examples of emulsifying silicone elastomers include partially crosslinked polyether-modified silicones in which silicone chains are crosslinked with polyether chains, and partially crosslinked polyglycerin-modified silicones in which silicone chains are crosslinked with polyglycerin chains. Examples of non-emulsifying silicone elastomers include crosslinked silicones in which silicone chains are crosslinked with alkyl chains or vinylmethicone chains. The silicone chains may have alkyl side chains, phenyl side chains, or silicone side chains.

[0016] Specific examples of emulsifying silicone elastomers include, but are not limited to, (dimethicone / (PEG-10 / 15)) crosspolymer, (PEG-15 / lauryl dimethicone) crosspolymer, (PEG-10 / lauryl dimethicone) crosspolymer, (PEG-15 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer, (dimethicone / polyglycerin-3) crosspolymer, (lauryl dimethicone / polyglycerin-3) crosspolymer, (polyglyceryl-3 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer, and the like.

[0017] Specific examples of non-emulsifying silicone elastomers include, but are not limited to, dimethicone crosspolymer, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, (vinyl dimethicone / lauryl dimethicone) crosspolymer, (lauryl polydimethylsiloxyethyl dimethicone / bis vinyl dimethicone) crosspolymer, and the like.

[0018] When preparing the cosmetic of the present invention, it is preferable to blend (A) the silicone elastomer in the form of a swollen substance (silicone gel) swollen with an oil that is liquid at room temperature (25°C) (hereinafter referred to as "liquid oil"). Examples of liquid oils used for swelling include silicone oil, hydrocarbon oil, ester oil, and higher fatty acid. In the present invention, it is particularly preferable to use a liquid oil that is compatible with (c1) the non-volatile dimethicone used as a solvent for forming a slurry in the wet molding described below, and in particular, a swollen substance (silicone gel) using the same silicone oil as the non-volatile dimethicone.

[0019] The silicone elastomer swollen product (silicone gel) may be commercially available. Examples of commercially available products preferably used in the present invention include "KSG-210 (trade name)" (dimethicone swollen product of (dimethicone / (PEG-10 / 15)) crosspolymer), "KSG-360Z (trade name)" (dimethicone swollen product of (PEG-15 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer), "KSG-710 (trade name)" (dimethicone swollen product of (dimethicone / polyglycerin-3) crosspolymer), and "KSG-16 (trade name)" (dimethicone swollen product of (dimethicone / vinyl dimethicone) crosspolymer), all manufactured by Shin-Etsu Chemical Co., Ltd.

[0020] The blending amount of (A) silicone elastomer in the cosmetic of the present invention is 0.5 to 6 mass% and preferably 1 to 6 mass% based on the total amount of the cosmetic, in terms of actual elastomer content. The blending amount of (A) silicone elastomer can be adjusted appropriately within the above range, and can be, for example, 2 to 5 mass%, 2.5 to 4 mass%, or more than 4 mass% but not more than 6 mass%. If the blending amount is less than 0.5 mass%, the cosmetic will be too hard to mold, while if it is blended in more than 6 mass%, the cosmetic will become soft, and both impact resistance and stability will decrease.

[0021] (B) Powder Component The powder component (also referred to as "Component B") blended into the cosmetic of the present invention contains (b1) silica. By blending (b1) silica, it is believed that the relatively large amount of (C) oil (including (c1) non-volatile dimethicone) blended is absorbed appropriately, improving the feel (elasticity, etc.) of the cosmetic after molding.

[0022] The silica used in the present invention (also referred to as "component b1") can be the silica (also called "silicic anhydride") commonly used in cosmetics, and it is particularly preferable to use spherical silica powder. "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 silica used in the present invention can be any of porous, non-porous, and hollow powders. The average particle size of the (b1) silica is preferably about 2 to 20 μm. The average particle size of the silica-containing powder (component B) can be measured in accordance with a laser diffraction / scattering method.

[0023] Among (b1) silicas, those with an oil absorption of 30 mL / 100 g or more are preferred, and those with an oil absorption of 50 mL / 100 g or more are more preferred. The upper limit of oil absorption is not particularly limited, but is usually 300 mL / 100 g or less. In this specification, "oil absorption" refers to a value measured in accordance with JIS K5101-13-2:2004 (boiled linseed oil method). Specifically, it is a value that can be determined by substituting "squalane" for "boiled linseed oil" in the following method. 1.5 g of spherical silica sample is collected on a medicine wrapping paper and transferred to a glass measuring plate. Next, boiled linseed oil (as specified in JIS K 5101) is dripped onto the sample from a burette, 4 or 5 drops at a time, and each time, the entire mixture is thoroughly mixed with a palette knife. This dropping and kneading process is repeated until the whole mixture becomes a hard putty-like mass, and each drop is kneaded together until the last drop can be wound into a spiral shape using a palette knife. This is the end point, and the oil absorption per 100 g of sample is calculated using the following formula: Oil absorption (mL / 100 g) = (A / W) x 100 (A represents the amount of boiled linseed oil dropped (mL), and W represents the amount of sample collected (g)).

[0024] The silica (component b1) preferably used in the present invention can also be defined by its specific surface area. The "specific surface area" of silica can be calculated by measuring the amount of nitrogen adsorbed onto silica at 77 K and analyzing it by the BET method.

[0025] The silica (component b1) preferably used in the present invention is 10m ２ / g or more, and more preferably 50m ２ / g or more, more preferably 100m ２ The upper limit of the specific surface area is not particularly limited, but is usually 1000 m ２ In the present invention, silica (component b1) has an oil absorption of 30 mL / 100 g and / or a specific surface area of ​​10 m ２ When spherical silica having a particle size of 1 / g or more is used, the cosmetic composition has elasticity and good usability.

[0026] The blending amount of silica (component b1) in the cosmetic of the present invention is preferably 2 to 15 mass% of the total amount of the cosmetic, more preferably 3 to 12 mass%, and even more preferably 5 to 10 mass%. If the blending amount of silica (component b1) is less than 2 mass%, the molded cosmetic will not have an appropriate hardness and will be inferior in usability.

[0027] The powder components (component B) blended into the cosmetic of the present invention, other than silica (component b1), (“other powders”), are not particularly limited as long as they are those commonly used in powder cosmetics. Examples of other powders include extender pigments, inorganic pigments (white pigments, colored pigments), organic pigments, pearlescent agents (also known as luster pigments), ultraviolet scattering agents, other inorganic powders, and organic powders.

[0028] Specific examples of other powders include, but are not limited to, talc, mica, kaolin, sericite, muscovite, phlogopite, synthetic mica, synthetic fluorphlogopite, 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 soap (e.g., zinc myristate, calcium palmitate, aluminum stearate, etc.), photochromic titanium oxide (titanium dioxide sintered with iron oxide), reduced zinc oxide; organic powders (e.g., polyamide resin powder (nylon powder), polyethylene powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, benzoguanamine resin powder). powder, polytetrafluoroethylene powder, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., red iron oxide (red iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-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.) baltic, etc.); inorganic blue pigments (for example, ultramarine, iron blue, etc.); pearling agents (for example, bismuth oxychloride, fish scale foil, titanium dioxide-coated mica, titanium dioxide-coated mica, titanium dioxide-coated mica), metal powder pigments (for example, aluminum powder, copper powder, etc.); organic pigments (for example, zirconium, barium, or aluminum lake, etc.); natural dyes (for example, chlorophyll, β-carotene, etc.); ultraviolet scattering agents (fine particle titanium dioxide, fine particle zinc oxide, etc.). Among these, when an organic pigment is blended, the color development of the cosmetic product is improved.Specific examples of organic pigments include 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.

[0029] Among the "other powders" mentioned above, extender pigments such as mica and talc are important powder components for constituting solid powder cosmetics. In the cosmetics of the present invention, it is preferable that most or all of the extender pigments be mica. Coloring materials such as inorganic pigments and pearlescent agents play an important role in the cosmetic effects achieved by the solid powder cosmetics. In the cosmetics of the present invention, the blending amount of the pearlescent agent is preferably about 5 to 40% by mass of the total cosmetic, and the blending amount of the color pigment such as iron oxide is preferably about 0.5 to 20% by mass of the total cosmetic. Therefore, the blending ratio (mass ratio) of the pearlescent agent to the color pigment is preferably in the range of 1:4 to 80:1, more preferably 1:3 to 20:1, and even more preferably 1:2 to 2:1.

[0030] (C) Oil The oil (also referred to as "Component C") blended into the cosmetic of the present invention contains (c1) non-volatile dimethicone with 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 dimethicone (polydimethylsiloxane) that is liquid at room temperature (25°C) and is a non-volatile silicone oil with a viscosity (kinematic viscosity) of 10 cs (centistokes) or less. "Non-volatile" in this specification 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 weight change rate (rate of loss due to volatilization) measured by a gravimetric method after placing filter paper on a glass petri dish and dropping approximately 0.2 g of sample on it. In contrast, a volatile content of more than 5% measured under similar conditions is considered "volatile."

[0031] The nonvolatile dimethicone (component c1) used in the present invention is a dimethicone having a viscosity of 10 cs or less, preferably 8 cs or less, more preferably about 6 cs, and is preferably a linear dimethicone. The lower limit of the viscosity is not particularly limited as long as it is "nonvolatile," but is usually 6 cs or more.

[0032] The amount of non-volatile dimethicone (ingredient c1) in the cosmetic of the present invention is 25 to 50% by mass, preferably 25 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 25% by mass or more than 50% by mass, a cosmetic with a bouncy feel cannot be obtained.

[0033] The oil (component C) in the present invention, which is a non-volatile oil other than non-volatile dimethicone (component c1), is not particularly limited as long as it is one that can be used in general cosmetics, but it is preferable to blend (c2) a non-silicone oil that is liquid at room temperature (25°C) (also referred to as a "non-silicone liquid oil" or "component c2").

[0034] Examples of non-silicone liquid oils (component c2) include 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, and 2-heptyl palmitate. Undecyl, butyl stearate, isocetyl stearate, isocetyl isostearate, decyl oleate, dodecyl oleate, oleyl oleate, myristyl lactate, cetyl lactate, diisostearyl malate, cholesteryl hydroxystearate, methyl castor oil fatty acid, diethylhexyl succinate, diisobutyl adipate, di-2-hexyldecyl adipate, diheptylundecyl adipate, diisopropyl sebacate, diethylhexyl sebacate, di-2-ethylhexanoic acid Ethylene glycol, neopentyl glycol dicaprate, neopentyl glycol dioctanoate, acetoglyceride, glyceryl diheptylundecanoate, glyceryl trioctanoate, glyceryl tri-2-ethylhexanoate, glyceryl trimyristate, glyceryl triisopalmitate, trimethylolpropane triethylhexanoate, trimethylolpropane triisostearate, pentaerythrityl tetraoctanoate, pentaerythrityl tetra-2-ethylhexanoate, etc. Ester oils; hydrocarbon oils such as liquid paraffin, squalane, hydrogenated polydecene, pristane, and polybutene; and liquid oils and fats such as avocado oil, evening primrose oil, camellia oil, macadamia nut oil, sunflower oil, almond oil, corn oil, olive oil, rapeseed 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, Japanese kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, and germ oil, but are not limited to these.

[0035] The blend amount of the non-silicone liquid oil (component c2) in the cosmetic of the present invention is usually 1 to 20 mass %, preferably 1 to 15 mass %, and more preferably 1 to 10 mass %, based on the total amount of the cosmetic.

[0036] The cosmetic of the present invention may contain a non-volatile silicone oil other than non-volatile dimethicone (component c1) (also referred to as "other non-volatile silicone oil"). Examples of other non-volatile silicone oils 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 are blended into the cosmetic of the present invention, the blending amount of the other non-volatile silicone oil is preferably less than that of non-volatile dimethicone (component c1), and the blending amount of the other non-volatile silicone oil relative to the total amount of the cosmetic 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 of the present invention also includes embodiments that do not contain other non-volatile silicone oils.

[0037] The cosmetic of the present invention may contain a volatile oil in addition to the non-volatile oil. Examples of volatile oils include hydrocarbon oils with low boiling points (e.g., boiling points of 200°C or less), such as isododecane, isohexadecane, and light liquid isoparaffin, and low boiling point chain or cyclic silicone oils, such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane. However, formulations containing volatile oils pose limitations, such as the need to use an airtight container for the molded cosmetic. Therefore, the amount of volatile oil in the molded cosmetic is preferably less than 5% by mass, more preferably 3% by mass or less, and even more preferably 1% by mass or less, based on the total amount of the cosmetic. The cosmetic of the present invention also includes embodiments that do not contain volatile oils.

[0038] The oil component (component C) of the cosmetic of the present invention may contain an oil component that is solid or semi-solid at room temperature (25°C) ("solid oil component or semi-solid oil component"). Examples of solid oil components or semi-solid oil components include solid oils and fats such as cocoa butter, coconut oil, horse oil, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, cow's foot fat, Japan wax, and hydrogenated castor oil; beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivotaro wax, spermaceti wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, sugarcane wax, lanolin fatty acid isopropyl, reduced lanolin, and jojoba. Examples of waxes include wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, and POE hydrogenated lanolin alcohol ether; hydrocarbon waxes such as polyethylene wax, paraffin, ceresin, petrolatum, microcrystalline wax, and Lunacera; fatty acid glyceryl ethers such as monostearyl glycerin ether (batyl alcohol); and fatty acid glycerides. However, since the incorporation of solid oils such as wax requires a heating step to dissolve or melt the wax, it is preferable to minimize the amount of wax incorporated into the cosmetic of the present invention. For example, the amount of wax incorporated is preferably less than 2% by mass, more preferably less than 1% by mass, and even more preferably less than 0.5% by mass, of the total amount of the cosmetic. The cosmetic of the present invention also includes embodiments that do not contain wax.

[0039] The oil component (component C) of the cosmetic of the present invention may be blended with 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 incorporation 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.

[0040] In addition to the essential components (A) silicone elastomer, (B) powder component, and (C) oil component described above, the cosmetic of the present invention may contain other optional components that can be incorporated into solid cosmetic powder preparations, to the extent that the effects of the present invention are not impaired. Examples of other optional components include, but are not limited to, surfactants, ultraviolet absorbers, moisturizers, antioxidants, film-forming agents, preservatives, various chemicals, fragrances, etc.

[0041] <Production Method> Another aspect of the present invention is a method for producing a powder solid cosmetic, comprising: (1) a step of mixing (A) a silicone elastomer, (B) a powder component containing (b1) silica, and (C) a raw material composition containing an oil 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 while removing a portion of the (c1) non-volatile dimethicone.

[0042] In the production method of the present invention, (A) silicone elastomer, (B) powder component, (b1) silica, (C) oil component, and (c1) non-volatile dimethicone having a viscosity of 10 cs or less are as described above.

[0043] In the manufacturing method of the present invention, first, a raw material composition is prepared by mixing raw materials including (A) a silicone elastomer, (B) a powder component, and (C) an oil component (raw material preparation step). The (B) powder component contains (b1) silica. The (C) oil component contains (c2) a non-volatile non-silicone liquid oil component, and preferably further contains (c1) a non-volatile dimethicone having a viscosity of 10 cs or less. The blending amounts of each component, excluding (c2) the non-volatile non-silicone liquid oil component, are within the ranges described above for cosmetics.

[0044] The raw material preparation step can be carried out using, for example, a device such as a Henschel Mixer (registered trademark) or a Pulverizer. By selecting a formulation that does not contain wax as the cosmetic material, there is no need to provide a heating step for uniform mixing.

[0045] Next, a solvent is added to the prepared raw material composition and mixed to form a slurry (slurry formation step). Specifically, the solvent and raw material composition are introduced into an apparatus such as a Disper mixer, a homogenizer, a planetary mixer, a Combimix (registered trademark), an Ajihomo mixer, or a twin-screw kneader, and mixed / dispersed.

[0046] The solvent used in the slurry formation step is (c1) non-volatile dimethicone with a viscosity of 10 cs or less. A volatile solvent such as water, a lower alcohol, a volatile silicone oil, or a volatile hydrocarbon oil may be added to the solvent. 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 with a viscosity of 10 cs or less.

[0047] The blending ratio (mass ratio) of the solvent to the raw material composition in the slurry formation step, solvent (mass) / raw material composition (mass), is preferably within a range of 1 / 2 to 3 / 2, and more preferably 7 / 10 to 11 / 10.

[0048] In the manufacturing 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 performing the compression molding step is not particularly limited, and known methods 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.

[0049] In the compression molding step, the conditions for solvent removal and compression are preferably adjusted so that at least a portion of the solvent (c1) non-volatile dimethicone remains in the molded cosmetic. That is, the cosmetic after the compression molding step is adjusted so that (c1) non-volatile dimethicone with a viscosity of 10 cs or less is contained in an amount of 25 to 50 mass% of the total cosmetic. By using the manufacturing method of the present invention, a heat drying step for removing the solvent is not required, thereby simplifying the process. Therefore, the manufacturing method of the present invention is suitable for mass-producing the cosmetic of the present invention. The above is the first embodiment of the manufacturing method of the present invention.

[0050] In the manufacturing method of the first embodiment of the present invention, a raw material composition may be prepared without blending the silicone elastomer (A) in the "raw material preparation step," and the silicone elastomer (A) may be dispersed separately in a solvent to be used in the "slurry formation step," after which the above-mentioned "slurry formation step" and "compression molding step" are carried out. This is the second embodiment of the manufacturing method of the present invention.

[0051] The second embodiment of the manufacturing method is a method for manufacturing a solid cosmetic product in powder form according to the present invention, comprising the steps of: (1) preparing a raw material composition containing (B) (b1) a powder component containing silica and (C) an oil; (2) dispersing (A) a silicone elastomer in (c1) a non-volatile dimethicone having a viscosity of 10 cs or less to form a solvent; (3) mixing the raw material composition with the solvent to form a slurry; and (4) filling the slurry into a container and compression-molding while removing a portion of the (c1) non-volatile dimethicone. The equipment and conditions used in the second embodiment are the same as those in the first embodiment.

[0052] When the manufacturing method of the second aspect is used, the dispersion state of the blended ingredients in the slurry obtained in the "slurry formation step" is further improved, and the powder solid cosmetic product after compression molding has an even smoother feel when used. Furthermore, by dispersing the silicone elastomer (A) in a solvent in advance, there is also the advantageous effect in manufacturing that the silicone elastomer is less likely to form lumps. The cosmetic product of the present invention is preferably manufactured by the method of the first or second aspect described above.

[0053] The cosmetic according to the present invention is a powdery solid cosmetic having a highly elastic feel when used, and can be provided in the form of makeup cosmetics such as foundation, eye shadow, cheek color, body powder, face powder, perfume powder, baby powder, pressed powder, deodorant powder, and loose powder (face powder).

[0054] The present invention will be described in more detail below with reference to 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.

[0055] Solid cosmetic powder compositions having the formulations shown in Tables 1 and 2 below were prepared as follows. First, raw material compositions having the formulations shown in Tables 3 and 4 were prepared, and 70 g of a solvent (non-volatile dimethicone (silicone KF-96A-6T (Shin-Etsu Chemical Co., Ltd.)) was added to 100 g of each raw material composition to form a slurry. Next, the slurry was filled into a container while sucking out the solvent and compression molded to produce the corresponding cosmetic compositions shown in Tables 1 and 2.

[0056] The cosmetic compositions of each example were evaluated and measured for usability (elasticity) and mass productivity. The evaluation / measurement methods are as follows. The evaluation / measurement results for the cosmetic compositions of each example are shown in Tables 1 and 2.

[0057] (1) Usability (Elasticity) Each cosmetic sample was used by a panel of experts, and the elasticity felt during use was evaluated according to the following criteria: <Evaluation criteria> A: Excellent elasticity B: Elasticity C: No elasticity

[0058] (2) Mass-producibility When compression molding is performed while sucking out the solvent in wet molding, the ease of solvent separation (solvent loss) varies depending on factors such as the compatibility between the raw material composition and the solvent. If there is too much solvent loss, defects such as cracks and breaks occur, making the product unsuitable for mass production, and if there is too little solvent loss, molding becomes difficult. The "solvent loss" of each cosmetic example when produced by the wet molding method was evaluated according to the following criteria. <Evaluation criteria> A: Solvent loss is moderate, making it excellent for mass production B: Solvent loss is excessive, making it unsuitable for mass production C: Solvent loss is insufficient, making molding difficult

[0059] <Formulation 1 of solid powder cosmetic product>

[0060] <Formulation of solid powder cosmetic product 2>

[0061] <Formulation 1 of Raw Material Composition>

[0062] <Formulation 2 of Raw Material Composition>

[0063] As shown in Tables 1 and 2, the cosmetics of the present invention (Examples 1 to 6), in which the blending amount of (A) silicone elastomer was 0.5 to 6% by mass, the blending amount of (c1) non-volatile dimethicone with a viscosity of 10 cs or less was within the range of 25 to 50% by mass, and the blending amount of (b1) silica in the (B) powder component, had appropriate hardness and excellent elasticity during use. Among them, Example 6, which blended an organic pigment, further improved color development. On the other hand, Example 2, which blended a dextrin fatty acid ester, suffered from significant solvent loss during wet molding, making it unsuitable for mass production in some cases.

[0064] On the other hand, in Comparative Example 1, in which the (B) powder component did not contain (b1) silica, the cosmetic material after molding was too soft and had poor usability. In Comparative Example 2, in which the (A) silicone elastomer was not blended, the solvent did not escape during wet molding, and molding was not possible. Furthermore, when the blending amount of (c1) non-volatile dimethicone was not within the specified range of 25 to 50 mass%, the cosmetic material lacked elasticity (Comparative Examples 3 and 4).

[0065] Furthermore, when the raw material composition of Example 1 was used and the solvent for forming the slurry was replaced with diphenylsiloxyphenyl trimethicone (methylphenylpolysiloxane: KF-56 (Shin-Etsu Chemical Co., Ltd.)), which is a non-volatile silicone oil other than dimethicone, wet molding was not possible.

[0066] The solid cosmetic powder preparations of Examples 1 to 6 described above were produced using the manufacturing method of the second aspect. The raw material composition used was a composition (100 g) in which the "silicone elastomer" ((dimethicone / (PEG-10 / 15)) crosspolymer) in the formulation of Table 3 was replaced with the same amount of "non-volatile dimethicone" (Silicone KF-96A-6T (Shin-Etsu Chemical Co., Ltd.)). The solvent used was 70 g of non-volatile dimethicone (Silicone KF-96A-6T (Shin-Etsu Chemical Co., Ltd.)) in which the amount (g) of "silicone elastomer" ((dimethicone / (PEG-10 / 15)) crosspolymer) shown in Table 3 had been dispersed. A solvent was added to the raw material composition to form a slurry. The slurry was then filled into a container while removing the solvent, and compression-molded to produce the cosmetic preparations of the formulations shown in Table 1 (Examples 1 to 6). The usability (elasticity) and mass productivity of the obtained cosmetic preparations were equivalent to those of Examples 1 to 6. In addition, the feel (smoothness) of the cosmetic when used was improved compared to Examples 1-6.

[0067] Other formulation examples of solid cosmetic powder preparations according to the present invention are shown below. Using raw material compositions having the formulations shown in Table 5 (right side) below, solid cosmetic powder preparations having the formulations shown in Table 5 (left side) were produced by the wet molding method in the same manner as in the above examples. The solid cosmetic powder preparations of Formulation Examples 1 and 2 had properties equivalent to those of the solid cosmetic powder preparations of Examples 1 and 2, respectively.

[0068]

Claims

1. A solid powder cosmetic comprising: (A) 0.5-6% by mass of a silicone elastomer relative to the total amount of the cosmetic; (B) a powder component; and (C) an oil component, wherein the (B) powder component contains (b1) silica, and the (C) oil component contains (c1) a non-volatile dimethicone having a viscosity of 10 cs or less in an amount of 25-50% by mass relative to the total amount of the cosmetic.

2. (b1) Silica is 10m ２ The cosmetic preparation according to claim 1, having a specific surface area of ​​30 mL / 100 g or more or an oil absorption of 30 mL / 100 g or more.

3. The cosmetic according to claim 1 or 2, wherein the blending amount of (b1) silica is 2 to 15 mass% based on the total amount of the cosmetic.

4. The cosmetic preparation according to claim 1, wherein the silicone elastomer (A) is a (dimethicone / (PEG-10 / 15)) crosspolymer.

5. A method for producing a powder solid cosmetic preparation according to claim 1, comprising the steps of: (1) mixing (A) a silicone elastomer, (B) a powder component containing (b1) silica, and (C) a raw material composition containing an oil with (c1) a non-volatile dimethicone having a viscosity of 10 cs or less to form a slurry; and (2) filling the slurry into a container and compression-molding the slurry while removing a portion of the (c1) non-volatile dimethicone.

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