Method for producing oily solid cosmetic

Abstract

The present invention provides a method for producing an oily solid cosmetic having improved effects of preventing surface color unevenness and the occurrence of cavities, air bubbles, pinholes, and the like.　Provided is a method for producing an oily solid cosmetic 6 using (A) an inner tray container 1 that can be stored in a cosmetic container and is a dish-shaped container 1 into which a cosmetic can be packed, the container 1 being provided with a filling hole 11 and an air hole 12 in the bottom part of the container 1, (B) a flexible rubber mold 2, and (C) an oily cosmetic 4, the method comprising: a step for positioning the rubber mold 2 on the inner tray container 1 so as to seal an opening 13 in the inner tray container 1; a step for heating the oily cosmetic 4, feeding the oily cosmetic 4 through the filling hole 11 in the bottom part of the inner tray container in a state in which the opening 13 in the inner tray container 1 faces downwards, and packing the oily cosmetic 4 into an internal space formed by the inner tray container 1 and the rubber mold 2; a step for performing cooling to solidify the oily cosmetic 4; and a step for removing the rubber mold 2. A contact surface 21 of the rubber mold 2 that comes into contact with the oily cosmetic 4 is subjected to blast processing, and the rubber mold 2 is positioned such that the contact surface 21 faces the internal space.

Description

Manufacturing method for oily solid cosmetics

[0001] The present invention relates to a method for producing an oily solid cosmetic preparation.

[0002]

[0003] A typical filling method for oil-based solid cosmetics involves sealing the top surface of the product with a rubber mold and pouring the oil-based cosmetic into a dish-shaped container from the outside of the bottom to form the product. In particular, with thin, wide-surface-area oil-based solid cosmetics, air can get into the cosmetic during filling, creating voids, bubbles, pinholes, and the like, or uneven coloring of the filled product. Furthermore, cracks can form in the voids, impairing the product's aesthetic appearance. To address this issue, the temperature of the cosmetic or the mold temperature during filling has been adjusted, and the surface of the filled product has been reheated after filling. However, with oil-based solid cosmetics with complex patterns or designs, reheating is not possible when voids or uneven coloring occur, as this would destroy the pattern or design on the molded surface. Therefore, this issue has been addressed by adjusting the temperature of the cosmetic or the mold temperature during filling. However, depending on the type of oil-based solid cosmetic, adjusting the temperature of the cosmetic or the mold temperature during filling has not been sufficient to solve the above-mentioned problems. Therefore, there has been a demand for a new method for producing oil-based solid cosmetics that can solve the problems of pinholes, uneven color, etc. Here, "reheating" refers to remelting the surface of the filled product after heating and filling.

[0003]

[0004] For example, Patent Document 1 discloses a method for filling a cosmetic having irreversible properties into a cosmetic inner container, the method comprising the steps of sealing the top surface of a cosmetic inner container that is open at the top and bottom with a filling mold and inverting the container so that the sealed top surface faces downward and the open bottom surface faces upward, and filling the cosmetic through the bottom surface of the cosmetic inner container. Patent Document 2 also discloses an oily solid cosmetic having two or more layers and convex portions, which is obtained by filling a first oily solid cosmetic into a mold with a concave portion, attaching a frame to the outer periphery of the mold, filling a second oily solid cosmetic in a dissolved state into the frame, allowing it to solidify, and then removing the mold, wherein the mold with the concave portion has a support portion that can support at least a portion of the bottom of the frame when the frame is attached.

[0004] JP 2019-500121 A JP 2014-129270 A

[0005] However, while the technology described in Patent Document 1 provides a cosmetic product filled in a cosmetic container that is smooth and even in color, prevents exudation, has a relatively low hardness, and is easy to apply, it does not provide a design with unevenness on the surface. Furthermore, while it can prevent color unevenness on the surface, it cannot prevent cavities, air bubbles, pinholes, etc. Furthermore, while the technology described in Patent Document 2 can provide an oil-based solid cosmetic product with convex portions, it cannot prevent color unevenness, cavities, air bubbles, pinholes, etc. on the surface.

[0006] Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for producing an oily solid cosmetic preparation which is more effective in preventing the occurrence of uneven color on the surface, voids, bubbles, pinholes, etc.

[0007] As a result of intensive research into solving the above-mentioned problems, the inventors discovered that the above-mentioned object could be achieved by using a tray-shaped container with a filling hole and an air hole in the bottom and a blasted rubber mold, and filling the oil-based cosmetic through the filling hole in the bottom, and thus completed the present invention.

[0008] That is, the method for producing an oily solid cosmetic of the present invention uses: (A) a tray-shaped container that can be filled with cosmetics and that can be housed in a cosmetic container having a filling hole and an air hole at the bottom of the container; (B) a flexible rubber mold; and (C) an oily cosmetic, comprising the steps of: setting the rubber mold on the tray so as to seal the opening of the tray; heating the oily cosmetic and directing the opening of the tray downward to feed the oily cosmetic through the filling hole at the bottom of the tray and fill the internal space formed by the tray and the rubber mold; cooling to solidify the oily cosmetic; and removing the rubber mold, wherein the rubber mold has a blasted surface that comes into contact with the oily cosmetic, and is set with the contact surface facing the internal space.

[0009] Furthermore, in the method for producing an oily solid cosmetic of the present invention, it is preferable that the rubber mold has an uneven portion on the surface that comes into contact with the oily solid cosmetic, which is used to provide an imprint for decorating the oily solid cosmetic, and that the rubber mold is set by being fitted onto the outer periphery of the opening of the inner tray container.

[0010] Furthermore, in the method for producing an oily solid cosmetic of the present invention, it is preferable that the filling hole is located in the center of the inner tray container, and the upper limit of the particle size of the abrasive used in the blasting process is a particle size such that, when the abrasive is sieved through a 425 μm mesh sieve, a 300 μm mesh sieve, and a 212 μm mesh sieve in that order, the total amount of the abrasive that passed through the 425 μm mesh sieve and remained on the 300 μm mesh sieve and the 212 μm mesh sieve exceeds 50% by mass when the amount of the abrasive that passed through the 425 μm mesh sieve is taken as 100% by mass, Preferably, the lower limit of the particle size of the abrasive is a particle size in which, when the abrasive is sieved through a 150 μm mesh sieve, a 106 μm mesh sieve, and a 63 μm mesh sieve in that order, the total amount of the abrasive that passes through the 150 μm mesh sieve and remains on the 106 μm mesh sieve and the 63 μm mesh sieve exceeds 50 mass % when the amount of the abrasive that passes through the 150 μm mesh sieve is taken as 100 mass %, the size of the filling holes is 3 mm to 15 mm, and the number of air holes is 1 to 8, and the diameter of the air holes is 0.5 mm to 4 mm.

[0011] Furthermore, in the method for producing an oily solid cosmetic of the present invention, it is preferable that the complex viscosity of the oily cosmetic at a temperature of 80 to 100°C is 10,000 mPa·s or less.

[0012] According to the present invention, it is possible to provide a method for producing an oily solid cosmetic product that is more effective in preventing uneven color on the surface and the occurrence of cavities, bubbles, pinholes, and the like.

[0013] 1 is a diagram showing (A) a container tray equipped with a fill hole and an air hole, and (B) a silicone rubber mold that has been subjected to a blast treatment. (B) A diagram showing the silicone rubber mold that has been subjected to a blast treatment attached to the container tray (A) equipped with a fill hole and an air hole. (A) A diagram showing the pre-adjusted (C) oil-based cosmetic being poured through the fill hole of the container tray equipped with a fill hole and an air hole. (A) A diagram showing the (C) oil-based cosmetic that has protruded from the fill hole and air hole of the container tray equipped with a fill hole and an air hole being removed with a spatula. (B) A diagram showing the finished oil-based solid cosmetic after the container tray equipped with a fill hole and an air hole (A) has been removed from the silicone rubber mold that has been subjected to a blast treatment. (C) A photograph showing the surface of the oil-based solid cosmetic of Example 1. (D) A photograph showing the surface of the oil-based solid cosmetic of Comparative Example 1, which suffered from color unevenness. (E) A photograph showing the surface of the oil-based solid cosmetic of Example 12. (F) A photograph showing the surface of the oil-based solid cosmetic of Comparative Example 9, which suffered from poor release properties and peeling.

[0014] The method for producing an oily solid cosmetic of the present invention will be specifically described below, but the present invention is not limited to the embodiments described in this specification. The method for producing an oily solid cosmetic of the present invention is a novel technology for filling an oily solid cosmetic, and comprises: (A) a tray-shaped container that can be filled with cosmetics and that can be housed in a cosmetic container having a filling hole and an air hole at the bottom of the container; (B) a flexible rubber mold; and (C) an oily cosmetic, and comprises the steps of: setting the rubber mold on the tray so as to seal the opening of the tray; heating the oily cosmetic and directing the opening of the tray downward to feed the oily cosmetic through the filling hole at the bottom of the tray and fill the internal space formed by the tray and the rubber mold; cooling to solidify the oily cosmetic; and removing the rubber mold, wherein the rubber mold has a blasted surface that comes into contact with the oily cosmetic, and is set with the contact surface facing the internal space. This makes it possible to provide a method for producing an oily solid cosmetic product that is more effective in preventing the occurrence of surface color unevenness, cavities, air bubbles, pinholes, etc. Furthermore, in the method for producing an oily solid cosmetic product of the present invention, the rubber mold can have an uneven portion on the contact surface that provides an imprint for decorating the oily solid cosmetic product, and the rubber mold is preferably set by fitting onto the outer periphery of the opening of the container. By subjecting the contact surface of the rubber mold to a blasting treatment, it is possible to improve the effect of preventing color unevenness and mold releasability. Furthermore, by providing air holes (holes for air and (C) oily cosmetic product protruding through the holes) in the (A) inner tray container, it is possible to improve the effect of preventing cavities, air bubbles, pinholes, etc. Furthermore, when filling the (C) oil-based cosmetic, air and a small amount of the (C) oil-based cosmetic escape through the air hole, allowing the (A) inner tray container to be sufficiently filled with the (C) oil-based cosmetic. Therefore, even if the (B) rubber mold has a shape corresponding to the uneven portion for engraving, it is possible to decorate it with clear unevenness.

[0015] In the present invention, the material of the (A) inner tray container is not particularly limited as long as the effects of the present invention are obtained, but metal or resin materials can be used, and when used for foundation, a metal or resin tray-shaped container for foundation can be used. Furthermore, the shape of the (A) inner tray container may be circular when viewed from above or polygonal, such as a square or rectangular shape, and in the case of a polygonal shape such as a square, the corners may be rounded. Furthermore, the size of the (A) inner tray container is not particularly limited, and a container the size of a metal or resin tray commonly used for cosmetics can be used. Furthermore, the (A) inner tray container can be attached to and stored in an outer container such as a compact container by a known method.

[0016] Furthermore, in the present invention, the fill hole of the (A) container tray is not limited as long as it can fill the (A) container tray with the (C) oil-based cosmetic. However, because the (C) oil-based cosmetic is in liquid form during filling, the fill hole of the (A) container tray has a diameter of 3 mm to 15 mm, preferably 4 mm to 10 mm, and more preferably 5 mm to 7 mm. If the hole diameter is smaller than 3 mm, the flow rate will be high, resulting in air being entrained during filling, resulting in a filled product with voids, and the voids will deteriorate release properties. If the hole diameter is larger than 15 mm, the (C) oil-based cosmetic will be expelled from the fill hole, making it impossible to retain the (C) oil-based cosmetic in the (A) container tray, or the voids will cause cracks, affecting release properties. Furthermore, the shape of the fill hole of the (A) container tray is not particularly limited and can be circular, square, or other shapes to match the shape of the nozzle, but a circular shape is preferred. In the present invention, the "hole diameter" of a filling hole or air hole refers to the diameter of the circle if it is circular, and refers to the diameter of the inscribed circle of the polygon if it is polygonal such as triangular or quadrangular.

[0017] Furthermore, in the present invention, the number and position of the filling holes in the (A) container tray are not limited as long as the (C) oil-based cosmetic can be filled into the (A) container tray, and while they may be located, for example, on the side of the lower part of the (A) container tray, it is preferable to have at least one filling hole in the center of the (A) container tray, and the filling holes may be located in other positions as long as they are fillable, or multiple filling holes may be located. Here, the center refers to the center of the circle if the (A) container tray is circular, and refers to the intersection of the diagonals if the (A) container tray is rectangular.

[0018] Furthermore, in the present invention, the number of air holes in the (A) container tray is not limited as long as it can remove air and the (C) oil-based cosmetic that has overflowed through the holes when the (C) oil-based cosmetic is filled into the (A) container tray. For example, the air holes may be located on the side of the lower part of the (A) container tray, but it is preferable to have 1 to 8 air holes in the corners of the (A) container tray, and 1 to 4 air holes in the corners of the (A) container tray, and it is more preferable to have 4 air holes in the corners of the (A) container tray. If the (A) container tray has fewer than one air hole, it will be impossible to remove air entrained during filling or air in the internal space created when the (A) container tray and the (B) rubber mold are set together. If the number of air holes exceeds 8, a large amount of the (C) oil-based cosmetic is likely to leak during filling, resulting in the formation of voids or deterioration of mold releasability due to the voids, and the effects of the present invention will not be achieved. Here, "corner" refers to the outer periphery of the circle if the (A) inner tray container is circular, and can be provided at any interval on the outer periphery; if it is rectangular, it refers to the four corners of the outer periphery of the rectangle, particularly; if it is triangular, it refers to the three corners of the outer periphery, particularly; if it is polygonal, it can be provided on the outer periphery, particularly at the corners, depending on the number of corners.

[0019] Furthermore, in the present invention, the shape of the air hole of the (A) inner tray container is not limited as long as it can remove air and the (C) oil-based cosmetic that has protruded through the hole when the (C) oil-based cosmetic is filled into the (A) inner tray container. Circular, rectangular, etc. can be used, and although not limited thereto, circular shapes are particularly preferred.

[0020] Furthermore, in the present invention, the diameter of the air hole in the (A) inner tray is not limited as long as it can remove air and any (C) oil-based cosmetic that overflows through the hole when the (C) oil-based cosmetic is filled into the (A) inner tray, but the hole diameter is preferably 0.5 mm to 4 mm, more preferably 1 mm to 3 mm, and even more preferably 1.2 mm to 1.7 mm. If the hole diameter is smaller than 0.5 mm, air will not easily escape, resulting in voids, which may result in an insufficient amount of the (C) oil-based cosmetic being filled into the (A) inner tray, or in poor release properties due to the voids. If the hole diameter is larger than 4 mm, a large amount of the (C) oil-based cosmetic will be released along with the air, making it impossible to retain the (C) oil-based cosmetic in the (A) inner tray, resulting in voids and cracks that may deteriorate release properties, or may result in insufficient filling of the oil-based cosmetic into the uneven portion that becomes the imprint, or in incomplete release.

[0021] Furthermore, in the present invention, the flexible rubber mold (B) is not limited as long as the effects of the present invention can be obtained, and for example, rubber such as silicone rubber or butylene rubber can be used, but silicone rubber is particularly preferred.

[0022] Furthermore, in the present invention, the (B) rubber mold having a blasted surface that comes into contact with the oil-based cosmetic is a rubber mold made of silicone or the like that has been blasted, and can further have a design with projections and recesses that serve as a transfer mold for decorating the surface of the oil-based solid cosmetic. The design formed by the projections and recesses is not limited to letters, symbols, etc. Furthermore, the depth (height difference) of the projections and recesses of the (B) rubber mold for decorating is preferably 0.05 mm or more, more preferably 0.2 mm or more, in order to more clearly bring out the three-dimensional effect and design of the surface, and more preferably 0.3 mm to 20 mm, in particular, when a three-dimensional effect is to be created.

[0023] Furthermore, in the present invention, blasting is a surface processing method in which countless particulate abrasives (abrasive grains, blasting materials) are sprayed onto the object and collided with the object to roughen, grind, etc. the surface of the object, and in the method for producing an oily solid cosmetic of the present invention, the surface of the (B) rubber mold is roughened by blasting the surface of the metal mold used to prepare the (B) rubber mold and molding it. Furthermore, in the present invention, metals, ceramics, glass, etc. can be used as the abrasives (abrasive grains, blasting materials) used in the blasting.

[0024] In the present invention, the upper limit of the particle size (size) of the abrasive is set such that, when the abrasive is sieved in the order of 425 μm mesh sieve, 300 μm mesh sieve, and 212 μm mesh sieve, the total amount of the abrasive that passes through the 425 μm mesh sieve and remains on the 300 μm mesh sieve and the 212 μm mesh sieve is 100 mass % and the amount of the abrasive that passes through the 425 μm mesh sieve is 100 mass %. The lower limit of the particle size of the abrasive is preferably a particle size such that, when the abrasive is sieved through a sieve with a mesh size of 150 μm, a sieve with a mesh size of 106 μm, and a sieve with a mesh size of 63 μm in that order, the total amount of the abrasive that passes through the 150 μm sieve and remains on the 106 μm sieve and the 63 μm sieve exceeds 50% by mass when the amount of the abrasive that passes through the 150 μm sieve is taken as 100% by mass. The upper limit of the particle size of the abrasive is a particle size in which, when the abrasive is sieved in the order of 250 μm mesh sieve, 180 μm mesh sieve, and 125 μm mesh sieve, the total amount of the abrasive that passes through the 250 μm mesh sieve and remains on the 180 μm mesh sieve and the 125 μm mesh sieve exceeds 50% by mass when the amount of the abrasive that passes through the 250 μm mesh sieve is taken as 100% by mass, and More preferably, the lower limit of the particle size is a particle size such that, when the abrasive is sieved through a 212 μm mesh sieve, a 150 μm mesh sieve, and a 106 μm mesh sieve in that order, the total amount of particles that pass through the 212 μm mesh sieve and remain on the 150 μm mesh sieve and the 106 μm mesh sieve exceeds 50% by mass, where the amount of particles that pass through the 212 μm mesh sieve is taken as 100% by mass. Abrasives can be freely combined and selected from within this particle size range in accordance with the design of the surface condition after filling of the oil-based solid cosmetic product. The particle size range of such abrasives is, for example, a range in which the upper limit passes through a 425 μm mesh sieve and the lower limit passes through a 425 μm mesh sieve, where the total amount of particles that remain on a 45 μm mesh sieve exceeds 80% by mass, where the amount of particles that pass through the 425 μm mesh sieve is taken as 100% by mass. If the particle size of the projection agent used is outside the above range, the mold releasability will be poor and color unevenness will occur, which may impair the appearance.

[0025] In addition, JIS R 6001-1 classifies the size of abrasives into 26 stages, from F4 to F220, and expresses them as particle size, with smaller numbers indicating coarser surfaces and larger numbers indicating finer surfaces, but abrasives of particle sizes specified in JIS R 6001-1 can be used as long as they satisfy the requirements of the present invention. Specifically, abrasives of particle sizes specified in JIS R 6001-1 are preferably F60 to F150, more preferably F70 to F120, and even more preferably F90 to F100.

[0026] In the present invention, the oil-based cosmetic (C) is not limited as long as it has fluidity that allows it to be filled through a filling nozzle when heated at 60°C to 120°C and solidifies when further cooled, and may contain water. The oil-based cosmetic includes a water-in-oil emulsion cosmetic, and is a cosmetic that can maintain its shape at room temperature (25°C) and can melt when heated to a predetermined temperature or higher. Specifically, the complex viscosity of the oil-based cosmetic (C) at a temperature of 80 to 100°C is preferably 10,000 mPa·s or less, more preferably 7,000 mPa·s or less, and even more preferably 4,000 mPa·s or less.

[0027] Furthermore, in the present invention, the oil-based cosmetic (C) can be blended with solid oils, liquid oils, semi-solid oils, powders, etc. Such solid oils are not particularly limited as long as they are solid oils used in ordinary oil-based solid cosmetics, and examples thereof include solid oils and fats such as sunflower seed wax, candelilla wax, silicone wax, cacao butter, coconut oil, horse tallow, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hydrogenated oil, beef foot fat, Japan wax, and hydrogenated castor oil, beeswax, cotton wax, carnauba wax, bayberry wax, privet wax, spermaceti wax, montan wax, rice bran wax, kapok wax, lanolin acetate, lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, hard lanolin, Examples of suitable solid oils include waxes such as shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether; hydrocarbon oils such as solid paraffin and microcrystalline wax; higher fatty acids such as myristic acid, palmitic acid, stearic acid, and behenic acid; and higher alcohols such as cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, and cetostearyl alcohol. One or more solid oils can be selected and blended as desired.The liquid oil is not particularly limited as long as it is a liquid oil used in ordinary oil-based solid cosmetics, but examples thereof include safflower oil, soybean oil, grape seed oil, sesame oil, wheat germ oil, avocado oil, olive oil, olive squalane, castor oil, macadamia nut oil, medfoam oil, sunflower oil, palm oil, almond oil, rosehip oil, apricot oil, camellia oil, evening primrose oil, etc., as well as plant-derived triglycerides such as glyceryl triisostearate and tri(caprylic / capric acid)glyceryl, dimer diol or dimer acid. Esters, animal oils such as mink oil, turtle oil, and liquid lanolin; hydrocarbons such as liquid paraffin, squalane, heavy liquid isoparaffin, and polybutene; fatty acid esters of lower alcohols such as isopropyl myristate, isopropyl isostearate, and lanolin fatty acid isopropyl; fatty acid esters of higher alcohols such as 2-ethylhexyl isononanoate, octyldodecyl myristate, octyldodecyl oleate, cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate, and isostearyl isostearate; diisostearate malate hydroxy acid esters of higher alcohols such as glyceryl tricaprylate, glyceryl tri-2-ethylhexanoate, propylene glycol dicaprylate, propylene glycol di(caprylic / capric acid), propylene glycol diisostearate, neopentyl glycol di-2-ethylhexanoate, fatty acid esters of polyhydric alcohols such as oleic acid, erucic acid, linoleic acid, isostearic acid, higher fatty acids such as oleyl alcohol, isostearyl alcohol, higher alcohols such as dimethylpolysiloxane, methylphenyl Examples of the liquid oil include linear polysiloxanes such as alkylpolysiloxane and diphenylpolysiloxane; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; silicone oils such as modified polysiloxanes such as amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, and fluorine-modified polysiloxane; and fluorine oils such as perfluoropolyether and perfluorocarbon. One or more liquid oils can be selected and blended as desired.Furthermore, the semi-solid oil is not particularly limited as long as it is a semi-solid oil used in ordinary oil-based solid cosmetics, and examples thereof include hydrogenated castor oil stearate, hydrogenated castor oil isostearate, tri(caprylic / capric / myristic / stearic acid)glyceryl, shea butter, cholesteryl hydroxystearate, cholesteryl isostearate, macadamia nut oil fatty acid dihydrocholesteryl, phytosteryl ricinoleate, phytosteryl isostearate, phytosteryl macadamia nut oil fatty acid, lanolin, octyldodecyl lanolin fatty acid, hexahydroxystearic acid Examples of suitable semi-solid oils include dipentaerythrityl, dipentaerythrityl (hydroxystearate / stearate / rosinate), dipentaerythrityl (hydroxystearate / isostearate), dipentaerythrityl rosinate, hydroxyalkyl dimer dilinoleyl ether, hydrogenated dimer acid di(phytosteryl-isostearyl-cetyl-stearyl-behenyl) ester, N-lauroyl-L-glutamic acid di(cholesteryl-behenyl-octyldodecyl), horse oil, hydrogenated vegetable oil, and petrolatum, and one or more types of semi-solid oils can be selected and blended as desired. Furthermore, the powder is not particularly limited as long as it is a powder used in ordinary oil-based solid cosmetics, and examples thereof include talc, kaolin, mica, synthetic mica, silica, barium sulfate, boron nitride, nylon powder, polyethylene powder, organopolysiloxane elastomer, bentonite, smectite, aluminum silicate, calcium silicate, magnesium silicate, silicic anhydride, crystalline cellulose, polymethacrylate esters (methyl and ethyl esters), polyacrylate esters (methyl and ethyl esters), nylon powder, and polyvinylpyrrolidone. Examples of suitable organic pigments include polymethylsilsesquioxane powder, which has a network structure in which siloxane bonds extend three-dimensionally and has an intermediate structure between inorganic and organic, in which a methyl group is bonded to one silicon atom; titanium dioxide, zinc oxide, iron oxide (such as red iron oxide), ultramarine, Prussian blue, pearl pigments (such as titanium mica), aluminum powder, organic pigments such as Red No. 104, Red No. 201, Red No. 202, Red No. 226, Yellow No. 4, Orange No. 204, Blue No. 404, Blue No. 1, and Green No. 3, and lakes thereof; and one or more types of powders can be selected and blended as desired.The shape of the powder may be spherical, similar to a sphere, plate-like, needle-like, or the like, and both porous and non-porous particles may be used for the powder.

[0028] In the present invention, the oil-based cosmetic (C) may contain, in addition to the above-mentioned components, other components typically used in cosmetics, pharmaceuticals, etc., within the scope of not impairing the effects of the present invention. Examples include moisturizers, various polymers and resins, surfactants, film-forming agents, thickeners, ultraviolet absorbers, lower alcohols, polyhydric alcohols, pigments, water, vitamins, preservatives, antioxidants, fragrances, etc.

[0029] Furthermore, in the present invention, oily solid cosmetics are those that can be used on the human body, etc., and do not exclude applications such as quasi-drugs and pharmaceuticals, and include basic cosmetics (external skin preparations), makeup cosmetics, hair cosmetics, bath additives, etc., of which makeup cosmetics are preferred, and can be used in particular as foundation, concealer, eye shadow, highlighter, shading, blush, lipstick, eyebrow, etc.

[0030] In the present invention, the oily cosmetic preparation (C) can be produced by a conventional cosmetic preparation method.

[0031] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples. Furthermore, the numerical values ​​in the formulations below represent mass %.

[0032] (Examples 1 to 11, Comparative Examples 1 to 8) Oil-based solid cosmetics of Examples 1 to 11 and Comparative Examples 1 to 8 were produced according to the "Procedure for producing oil-based solid cosmetics" below. The particle size (size) of the abrasive used in the blasting treatment and the sizes of the filling hole and air hole in the inner tray container were as shown in Tables 1 to 4. The obtained oil-based solid cosmetics of Examples 1 to 11 and Comparative Examples 1 to 8 were subjected to the following void test, color unevenness test, and releasability test, and the results are also shown in Tables 1 to 4. The complex viscosity of the (C) oil-based cosmetic used in Examples 1 to 11 and Comparative Examples 1 to 8 was 935 mPa s at 95°C.

[0033] (Procedure for producing an oil-based solid cosmetic product) Fig. 1 is a diagram showing (A) a tray-shaped container equipped with a filling hole and an air hole and (B) a silicone rubber mold that has been subjected to a blast treatment, Fig. 2 is a diagram showing that (B) the blast-treated silicone rubber mold has been attached to (A) the tray-shaped container equipped with a filling hole and an air hole, Fig. 3 is a diagram showing that (C) a pre-adjusted oil-based cosmetic product has been poured through the filling hole of (A) the tray-shaped container equipped with a filling hole and an air hole, Fig. 4 is a diagram showing that (C) the oil-based cosmetic product that has protruded from the filling hole and air hole of (A) the tray-shaped container equipped with a filling hole and an air hole has been removed with a spatula, and Fig. 5 is a diagram showing that (A) the tray-shaped container equipped with a filling hole and an air hole has been removed from (B) the silicone rubber mold that has been subjected to a blast treatment, thereby completing the oil-based solid cosmetic product. In the figures, 1 is a container tray, 11 is a filling hole, 12 is an air hole, 13 is an opening, 2 is a rubber mold, 3 is a filling nozzle, 4 is an oil-based cosmetic, 5 is the solidified oil-based cosmetic after cooling, 51 is the "solidified oil-based cosmetic" that has protruded from the container tray and been removed, and 6 is the oil-based solid cosmetic of the present invention. As shown in Figures 1 to 5, the surface 21 that comes into contact with the oil-based cosmetic has been subjected to a blasting treatment to form irregularities for applying an imprint as needed. (B) A flexible silicone rubber mold 2 is provided with a filling hole 11 and an air hole 12. (A) A metal container tray 1 is fitted around the periphery of the opening 13 of the metal container tray 1 with the contact surface of the rubber mold 2 facing the internal space of the container tray 1 so as to seal the opening 13 of the container. The (C) oil-based cosmetic 4, which had been prepared in advance, was heated and then fed into the filling hole 11. After cooling, the (C) oil-based cosmetic 51 that had protruded from the filling hole 11 and air hole 12 of the (A) inner tray container 1 equipped with the filling hole 11 and air hole 12 was removed with a spatula, and the (A) inner tray container 1 equipped with the filling hole 11 and air hole 12 and filled with the (C) oil-based cosmetic was taken out of the (B) blast-treated silicone rubber mold 2, thereby producing an oil-based solid cosmetic 6.

[0034] (Particle Size Conditions) In the table below, particle sizes A to E and "-" refer to the following conditions. A: An abrasive is sieved in the order of 425 μm mesh sieve, 300 μm mesh sieve, and 212 μm mesh sieve, and the total amount of the abrasive that passed through the 425 μm mesh sieve and remained on the 300 μm mesh sieve and the 212 μm mesh sieve exceeds 50% by mass when the amount of the abrasive that passed through the 425 μm mesh sieve is taken as 100% by mass. In this case, less than 20% of the abrasive passed through the 45 μm mesh sieve. B: When an abrasive is sieved in the order of 250 μm mesh sieve, 180 μm mesh sieve, and 125 μm mesh sieve, the total amount of the abrasive that passed through the 250 μm mesh sieve and remained on the 180 μm mesh sieve and the 125 μm mesh sieve accounts for more than 50% by mass of the abrasive that passed through the 250 μm mesh sieve, taken as 100% by mass. In this case, less than 20% of the abrasive passed through the 45 μm mesh sieve. C: When an abrasive is sieved in the order of 150 μm mesh sieve, 106 μm mesh sieve, and 63 μm mesh sieve, the total amount of the abrasive that passed through the 150 μm mesh sieve and remained on the 106 μm mesh sieve and the 63 μm mesh sieve is more than 50 mass% when the amount of the abrasive that passed through the 150 μm mesh sieve is taken as 100 mass%, and the amount of the abrasive that passed through the 45 μm mesh sieve is less than 20%. D: When an abrasive is sieved in the order of 1000 μm mesh sieve, 710 μm mesh sieve, and 500 μm mesh sieve, the total amount of the particles that passed through the 1000 μm mesh sieve and remained on the 710 μm mesh sieve and the 500 μm mesh sieve is more than 50% by mass when the amount of the particles that passed through the 1000 μm mesh sieve is taken as 100% by mass. E: An abrasive is sieved in the order of 125 μm mesh sieve, 90 μm mesh sieve, and 53 μm mesh sieve, and the total amount of the particles that passed through the 125 μm mesh sieve and remained on the 90 μm mesh sieve and the 53 μm mesh sieve is more than 50 mass% when the amount of the particles that passed through the 125 μm mesh sieve is taken as 100 mass%. -: No abrasive (no blasting process applied to the silicone rubber mold)

[0035] (Void Test) After removing the (A) inner tray container filled with the (C) oil-based cosmetic and equipped with a filling hole and an air hole from the (B) blast-treated silicone rubber mold for the obtained oil-based solid cosmetic, the surface was thinly scraped to check for the presence or absence of voids (porosity) inside, and evaluated according to the following evaluation criteria: ◎ (Excellent): No voids (porosity). ○ (Good): Almost no voids (porosity). △ (Fair): Some voids (porosity). × (Poor): Poor voids (porosity).

[0036] (Color Unevenness Test) (A) The inner dish container with a filling hole and an air hole, filled with (C) the oil-based cosmetic material, was removed from (B) the blast-treated silicone rubber mold, and the color unevenness on the surface of the obtained oil-based solid cosmetic material was visually checked and evaluated according to the following evaluation criteria. ⊚ (Excellent): No color unevenness. ○ (Good): Almost no color unevenness. △ (Fair): Some color unevenness. × (Unacceptable): Color unevenness.

[0037] (Mold Releasability Test) When removing the inner tray container (A) filled with the oil-based cosmetic (C) and equipped with a filling hole and an air hole from the blast-treated silicone rubber mold (B), the obtained oil-based solid cosmetic was visually inspected for release from the blast-treated silicone rubber mold (B) and the surface condition of the oil-based solid cosmetic, and evaluated according to the following criteria. ⊚ (Excellent): Very easy to release, and the surface of the oil-based solid cosmetic was uniform. ○ (Good): Easy to release, but slight peeling was observed on the surface of the oil-based solid cosmetic. △ (Fair): Somewhat difficult to release, and peeling was observed on the surface of the oil-based solid cosmetic. × (Poor): Difficult to release, and significant peeling was observed on the surface of the oil-based solid cosmetic.

[0038]

[0039]

[0040]

[0041]

[0042] Fig. 6 is a photograph showing the surface of the oil-based solid cosmetic preparation of Example 1, and Fig. 7 is a photograph showing the surface of the oil-based solid cosmetic preparation of Comparative Example 1 in which color unevenness occurred. From the results of Figs. 6 and 7 and Tables 1 to 4, the oil-based solid cosmetic preparations of Examples 1 to 11 achieved favorable results in the void test, color unevenness test, and release property test, and oil-based solid cosmetic preparations were produced that were improved in preventing the occurrence of surface color unevenness, cavities, air bubbles, pinholes, etc. On the other hand, the oil-based solid cosmetic preparations of Comparative Examples 1 to 8 had poor release property compared to the oil-based solid cosmetic preparations of Examples 1 to 11, and voids occurred in Comparative Examples 2, 3, 7, and 8, while color unevenness occurred in Comparative Examples 1, 4, 5, and 6.

[0043] (Example 12) Figure 8 is a photograph showing the surface of an oil-based solid cosmetic (Example 12) produced by replacing the silicone rubber mold subjected to (B) blast treatment in Example 1 with a rubber mold provided with an uneven portion for providing an imprint for decorating the oil-based solid cosmetic. In Example 12, there were also no voids or color unevenness, the mold releasability was good, and the unevenness of the decorative portion was clear.

[0044] Similarly, the surface condition of oil-based solid cosmetics produced by replacing the silicone rubber mold subjected to (B) blast treatment in Examples 2 to 11 with a rubber mold provided with an uneven portion for imprinting to decorate the oil-based solid cosmetic was checked. In this case as well, the results of the void test, color unevenness test, and mold releasability test were good, and oil-based solid cosmetics were produced that were improved in preventing the occurrence of surface color unevenness, cavities, air bubbles, pinholes, etc.

[0045] 9 is a photograph showing the surface of an oil-based solid cosmetic (Comparative Example 9) produced by replacing the silicone rubber mold that had not been subjected to blasting (B) in Comparative Example 1 with a rubber mold that had not been subjected to blasting and had an uneven portion for providing an imprint for decorating the oil-based solid cosmetic. The mold release was poor, causing peeling, and the unevenness of the decorative portion was unclear.

[0046] DESCRIPTION OF SYMBOLS 1 Inner tray container 11 Filling hole 12 Air hole 13 Opening 2 Rubber mold 21 Contact surface 3 Filling nozzle 4 Oil-based cosmetic material 5 Solidified oil-based cosmetic material 51 "Solidified oil-based cosmetic material" removed from inner tray container 6 Oil-based solid cosmetic material of the present invention

Claims

1. A manufacturing method using (A) a tray-shaped container that can be filled with cosmetics and that can be housed in a cosmetic container having a filling hole and an air hole at the bottom of the container, (B) a flexible rubber mold, and (C) an oil-based cosmetic, comprising the steps of: setting the rubber mold on the tray so as to seal the opening of the tray; heating the oil-based cosmetic and directing the opening of the tray downward to send the oil-based cosmetic through the filling hole at the bottom of the tray and fill the internal space formed by the tray and the rubber mold; cooling to solidify the oil-based cosmetic; and removing the rubber mold, wherein the rubber mold has a blasted surface on the surface that comes into contact with the oil-based cosmetic, and is set with the contact surface facing the internal space.

2. The method for producing an oily solid cosmetic product according to claim 1, wherein the rubber mold has an uneven portion on the surface that comes into contact with the oily solid cosmetic product, for providing an impression for decorating the oily solid cosmetic product.

3. The method for producing an oily solid cosmetic product according to claim 1, wherein the rubber mold is fitted and set around the outer periphery of the opening of the inner tray container.

4. The method for producing an oily solid cosmetic product according to claim 1, wherein the filling hole is located in the center of the inner tray container.

5. The upper limit of the particle size of the abrasive used in the blasting process is a particle size in which, when the abrasive is sieved in the order of 425 μm mesh sieve, 300 μm mesh sieve, and 212 μm mesh sieve, the total amount of the abrasive that passes through the 425 μm mesh sieve and remains on the 300 μm mesh sieve and the 212 μm mesh sieve exceeds 50% by mass when the amount of the abrasive that passes through the 425 μm mesh sieve is taken as 100% by mass, 2. The method for producing an oily solid cosmetic according to claim 1, wherein the lower limit of the particle size of the abrasive is a particle size such that, when the abrasive is sieved through a 150 μm mesh sieve, a 106 μm mesh sieve, and a 63 μm mesh sieve in that order, the total amount of the abrasive that passed through the 150 μm mesh sieve and remained on the 106 μm mesh sieve and the 63 μm mesh sieve exceeds 50% by mass when the amount of the abrasive that passed through the 150 μm mesh sieve is taken as 100% by mass; the size of the filling holes is 3 mm to 15 mm; and the number of the air holes is 1 to 8.

6. The method for producing an oily solid cosmetic product according to claim 5, wherein the diameter of the air holes is 0.5 mm to 4 mm.

7. The method for producing an oily solid cosmetic according to claim 5 or 6, wherein the complex viscosity of the oily cosmetic at a temperature of 80 to 100°C is 10,000 mPa·s or less.

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