HK1148213B

HK1148213B - Process for producing powdery cosmetic preparation

Info

Publication number: HK1148213B
Application number: HK11102377.6A
Authority: HK
Inventors: 长谷川修嗣; 分藤雅纪; 太田孝太郎; 仓桥琢磨; 当山惠介; 小川克基; 小仓能人
Original assignee: 株式会社资生堂
Priority date: 2007-12-19
Filing date: 2008-12-19
Publication date: 2013-02-01

Description

Method for producing powdery cosmetic

This application claims priority from japanese patent application No. 2007-327794, filed on 12/19/2007, and is incorporated herein.

Technical Field

The present invention relates to a method for producing a powdery cosmetic, and more particularly, to a method for easily producing a powdery cosmetic improved in practical properties such as spreadability on the skin, adhesion, a fine granular feel, and makeup durability, and impact resistance.

Background

Powder cosmetics represented by foundation creams are obtained by molding powder obtained by mixing powder components as a main component with an oily component and/or a surfactant as a binder, and are usually used with a makeup tool such as a puff, a sponge, a brush, or the like. Conventional general powder cosmetics are produced as follows: the powder component and the oil component are mixed by using a stirring mixer such as a henschel mixer, nauta mixer, ribbon blender, or kneader, homogenized by using a hammer mill such as a pulverizer, and dry-press-molded in a metal or resin tundish. Such a conventional method is also called a dry method because the powder component and the oil component are mixed without adding a solvent.

However, the conventional dry-type production methods described above have not been able to obtain a powder cosmetic which is sufficiently satisfactory in practical properties such as spreadability on the skin, adhesion, feeling of fine particles, and cosmetic durability, and impact resistance. This is considered to be because the powder component and the oily component are not sufficiently homogenized, and thus the agglomerated powder component remains and the oily component is unevenly distributed in the agglomerated powder.

On the other hand, in recent years, various production methods or molding methods have been developed in order to improve the practical characteristics of powder cosmetics. The following wet process is proposed: for example, a method of filling and solidifying a cosmetic, which comprises adding a solvent such as alcohol to a cosmetic base to prepare a slurry, filling the slurry into a container, and then removing the solvent by vacuum extraction (see patent document 1); a method for producing a solid powder cosmetic, which comprises adding a base material comprising a specific powder as a powder component and an oil agent to a solvent to prepare a slurry and then removing the solvent (see patent document 2); a method for producing a solid powder cosmetic, which comprises mixing a powder component and an oil component as a binder in a solvent to prepare a slurry, uniformly coating the surface of the powder component with the oil component for media agitation and milling, and then removing the solvent to dry-press-mold the slurry (see patent document 3).

However, even when the above-mentioned production method or molding method is employed, a powder cosmetic which is sufficiently satisfactory in practical characteristics such as a fine granular feeling and cosmetic durability or impact resistance cannot be obtained. In particular, in the wet method, the entire surface of the powder is coated with an oily component, and therefore, there is a problem that the oil absorption of the powder component is extremely low and the cosmetic durability against oily components such as sebum is poor. Further, the wet process requires a step of removing the solvent and drying, and thus has a problem of complicated steps, safety and environmental problems.

Further, in order to improve the makeup durability of the powder cosmetic, a powder component whose surface is treated with a fluorine compound having water-and oil-repellent properties is used, but since the fluorine compound has oil-repellent properties, the powder component and the oil component are difficult to be homogenized, and the powder is likely to aggregate, so that a desired makeup durability improving effect cannot be obtained, and the feeling of use is sometimes deteriorated. In addition, spherical elastic powder such as silicone or polyurethane is also blended in order to impart excellent use touch such as stretchability, but since it is difficult to uniformize the powder component and the oil component, there is a problem that impact resistance is particularly deteriorated. In addition, although attempts have been made to use a highly viscous oil component in order to improve adhesion to the skin, cosmetic durability, and the like, it is very difficult to uniformly disperse a highly viscous oil component in a powder by a conventional method, and there is a problem that aggregation of powder components is promoted.

Patent document 1: japanese examined patent publication No. 61-54766

Patent document 2: japanese laid-open patent publication No. 7-277924

Patent document 3: japanese patent No. 3608778

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above-mentioned conventional techniques, and an object to be solved is to provide a method for easily producing a powder cosmetic improved in practical properties such as spreadability on the skin, adhesion, a fine granular feel, and cosmetic durability, and impact resistance.

Means for solving the problems of the present invention

The present inventors have conducted intensive studies to solve the above problems and as a result, have found that: by mixing a powder component and an oil component as a binder using a rotary blade opposed type mixing device having a specific structure which has not been used in the production of cosmetics in the past, the oil component can be uniformly coated on the surface of the powder particles without causing aggregation of the powder component, and thus a powder cosmetic excellent in practical properties such as spreadability to the skin, adhesion, a fine granular feeling, and cosmetic durability, and impact resistance can be easily produced, and the present invention has been completed.

That is, the method for producing a powdery cosmetic according to the present invention is a method for producing a powdery cosmetic by mixing a powdery component and an oily component as a binder, and is characterized in that the device used for the mixing is a rotary-vane opposing mixing device as follows: a1 st rotor blade and a 2 nd rotor blade, which are provided with a plurality of blades, are arranged in a mixing chamber in a facing state such that the 1 st rotor blade and the 2 nd rotor blade have rotating shafts on the same axis, a raw material is supplied from an inlet on the 1 st rotor blade side, the raw material is mixed by rotating the 1 st rotor blade and the 2 nd rotor blade in the same or opposite directions to each other, and the mixed raw material is discharged from an outlet on the 2 nd rotor blade side.

In the above method for producing a powder cosmetic, it is preferable that 65 to 97 mass% of the powder component and 3 to 35 mass% of the oil component are mixed with respect to the total amount of the powder cosmetic. In the above method for producing a powder cosmetic, it is preferable that the 1 st rotary blade and the 2 nd rotary blade of the mixing device having the opposed rotary blades be rotated in opposite directions to each other.

In the method for producing a powder cosmetic, the powder component preferably contains a fluorine compound-treated powder. In the method for producing a powder cosmetic, the elastic powder is preferably contained in an amount of 5.0 to 20.0 mass% based on the total amount of the powder cosmetic. In the method for producing a powder cosmetic, the oil component preferably contains an oil component having a viscosity of 100 to 50000 mPaS. In the method for producing a powder cosmetic, the powder component preferably contains 5 to 75% by mass of the fluorine compound-treated powder relative to the total amount of the powder cosmetic, and the oil component preferably contains 0.1 to 10% by weight of an oil component having a viscosity of 100 to 50000 mPas relative to the total amount of the powder cosmetic.

Effects of the invention

According to the production method of the present invention, by mixing a powder component and an oil component as a binder using a rotary wing opposing type mixing device having a specific structure which has not been conventionally used for producing cosmetics, the oil component can be uniformly coated on the surface of the powder particles without causing aggregation of the powder component, and thus a powder cosmetic excellent in practical properties such as spreadability to the skin, adhesion, a fine granular feeling, and cosmetic durability, and impact resistance can be easily produced. Further, since the production method of the present invention is a dry production method that does not use a solvent when mixing the powder component and the oily component, the production process is simpler and there are fewer problems in terms of safety and/or environment, as compared with the wet production method.

Drawings

Fig. 1 is a schematic view of an example of a mixing device of a rotary-vane opposed type used in the production method of the present invention.

FIG. 2 is a scanning electron micrograph of the powder component/oil component mixtures obtained in example 4 and comparative example 4.

FIG. 3 is a graph showing the particle size distribution of the powder ingredient/oily ingredient mixtures and premixes obtained in example 4 and comparative example 4.

Description of the reference numerals

10-rotating-wing opposite-type mixing device

11 mixing chamber

12 engine

13 engines

14 st rotating wing

15 nd 2 nd rotary wing

16 throwing-in mouth

17 discharge port

20 raw material supply device

30 trapping device

32 recovery container

40 suction device

Detailed Description

The following describes embodiments of the present invention in detail, but the present invention is not limited thereto.

The method for producing a powdery cosmetic product according to the present invention is a method for producing a powdery cosmetic product by mixing a powdery component and an oily component as a binder, and is characterized in that the device used for the mixing is a rotary wing opposing type mixing device having a specific structure.

Powder composition

The powder component used in the production method of the present invention is not particularly limited as long as it is a powder component generally used for powder cosmetics. Examples of the powder component include talc, kaolin, sericite (セリサイト)), muscovite, phlogopite, synthetic mica, 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, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soap (for example, zinc myristate, calcium palmitate, aluminum stearate, etc.), boron nitride, photochromic titanium oxide (titanium dioxide calcined with iron oxide), and reduced zinc oxide; organic powders (for example, silicone elastomer powder, silicone resin-coated silicone elastomer powder, polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, copolymer resin powder of styrene and acrylic acid, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, and the like); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red iron oxide (ベンガラ)), iron titanate, and the like); inorganic brown pigments (e.g., gamma-iron oxide); inorganic yellow pigments (e.g., yellow iron oxide, ochre, etc.); inorganic black pigments (e.g., black iron oxide, titanium suboxide, etc.); inorganic violet pigments (e.g., manganese violet and cobalt violet); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine blue and berlin blue); pearlescent pigments (for example, bismuth oxychloride, fish scale foil, mica titanium, iron oxide-coated mica titanium, titanium suboxide-coated mica titanium, photochromic mica titanium; a substance using talc, glass, synthetic fluorophlogopite, silica, bismuth oxychloride or the like as a substrate instead of mica; a substance using titanium suboxide, colored titanium oxide, iron oxide, alumina, silica, zirconia, zinc oxide, cobalt oxide, aluminum or the like as a coating in addition to titanium oxide; a substance as a functional pearlescent pigment in which resin particles are coated on the surface of a pearlescent pigment (Japanese patent application laid-open No. 11-92688), a substance as a pearlescent pigment in which aluminum hydroxide particles are coated on the surface of a pearlescent pigment (Japanese patent application laid-open No. 2002-146238), a substance as a pearlescent pigment in which zinc oxide particles are coated on the surface of a pearlescent pigment (Japanese patent laid-open No. 2003-261421), a substance as a pearlescent pigment in which barium sulfate particles are coated on the surface of a pearlescent pigment (Japanese patent laid-open No.; metal powder pigments (e.g., aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium or aluminum lakes (for example, organic pigments such as red 201, red 202, red 204, red 205, red 220, red 226, red 228, red 405, orange 203, orange 204, yellow 205, yellow 401, and blue 404, and red 3, red 104, red 106, red 227, red 230, red 401, red 505, orange 205, yellow 4, yellow 5, yellow 202, yellow 203, green 3, and blue 1); natural pigments (e.g., chlorophyll, beta-carotene, etc.), and the like. The powder components may be used in combination of 1 or 2 or more.

As the powder component, a substance whose surface is not treated may be used, or a powder component whose surface is treated with silicone and/or a fluorine compound, a silane coupling agent, テフロン (registered trademark), a fatty acid soap, lauroyl lysine, or the like may be used. The powder component may be used in 1 or more than 2.

In the powdery cosmetic obtained by the production method of the present invention, the blending amount of the powdery component is preferably 65 to 97% by mass, and more preferably 80 to 93% by mass. If the amount of the powder component blended is less than 65% by mass, it is difficult to obtain a cosmetic which is sufficiently satisfactory in terms of spreadability on the skin and/or cosmetic durability, while if it exceeds 97% by mass, it is difficult to obtain a cosmetic which is sufficiently satisfactory in terms of practical properties such as adhesion to the skin and/or moist feeling, and impact resistance.

In the production method of the present invention, the fluorine compound-treated powder is preferably contained as a powder component. Although there is a problem that homogenization with an oil component is difficult and the powder is likely to agglomerate because the fluorine compound has oil repellent properties in the fluorine compound-treated powder, according to the production method of the present invention, the oil component can be uniformly coated on the surface of the powder particles by using a rotary-vane opposing type mixing device having a specific structure, and the water and oil repellent properties of the fluorine compound can be sufficiently exhibited even when the fluorine compound-treated powder is used, thereby obtaining a powder cosmetic having excellent cosmetic durability.

The fluorine compound to be treated on the surface of the powder includes perfluoroalkyl phosphate diethanolamide salts, perfluoroalkylsilane, perfluoroalkylethylacrylate, and other compounds having perfluoropolyether groups, such as perfluoropolyether dialkylphosphoric acid and salts thereof, perfluoropolyether dialkylsulfate and salts thereof, and perfluoropolyether dialkylcarboxylic acid and salts thereof.

Examples of the fluorine compound include 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (formula (I)).

Chemical (I)

CF₃CF₂CF₂CF₂CF₂CF₂CH₂CH₂Si(OEt)₃ (I)

Further, the treatment may be carried out by using a fluorine compound and other hydrophobizing treatment agent in combination. The fluorine compound-treated powder of the present invention also includes a powder obtained by treating a fluorine compound and other treating agents in combination. Specifically, the compound represented by formula (II) is exemplified as the acrylic silicone compound.

(chemical II)

(wherein n is an integer, a, b, c and d are molar ratios in the copolymer, respectively, and are not 0, and d is 40 to 60 mol%)

In the powdery cosmetic obtained by the production method of the present invention, the amount of the fluorine compound-treated powder blended is preferably 5 to 75% by mass based on the total amount of the powdery cosmetic. If the amount of the fluorine compound-treated powder blended is less than 5% by mass, it is difficult to actually feel the characteristic cosmetic-lasting property-improving effect of the fluorine compound-treated powder. When the amount exceeds 75% by mass, the adhesiveness to the skin and the like tend to be slightly deteriorated.

In the production method of the present invention, it is preferable that the elastic powder is contained as a powder component. In contrast to this, according to the production method of the present invention, by using a rotating-blade-opposed mixing device having a specific structure, even when such an elastic powder is used, the surface of the elastic powder particles can be uniformly coated with the oil component, and a powder cosmetic having excellent use feeling such as stretchability and impact resistance can be obtained. The elastic powder used in the present invention includes, for example, silicone rubber powder, silicone resin-coated silicone rubber powder, polyurethane powder, and the like.

The shape of the elastic powder is more preferably spherical. The average particle diameter is preferably 1 to 40 μm, more preferably 3 to 30 μm.

Commercially available products include a (vinyldimethylsiloxane/polymethylsiloxane silsesquioxane) crosslinked polymer (trade name: KSP-100, manufactured by shin-Etsu chemical Co., Ltd.), (diphenyldimethylsiloxane/vinyldiphenyldimethylsiloxane/silsesquioxane) crosslinked polymer (trade name: KSP-300, manufactured by shin-Etsu chemical Co., Ltd.), (dimethylsiloxane/vinyldimethylsiloxane) crosslinked polymer (trade name: トレフイル E-506, manufactured by east レ, ダウコ, ニング Co., Ltd.), and hexamethylene diisocyanate/trimethylol caprolactone crosslinked polymer (trade name: PlasticPonderD-400, manufactured by east ピグメント).

In the production method of the present invention, the blending amount of the elastic powder contained in the powder component is preferably 5.0 to 20.0% by mass, and more preferably 8.0 to 15.0% by mass, with respect to the total amount of the powder cosmetic. In the conventional production method, if elastic powder is blended, impact resistance tends to be deteriorated, but in the present invention, impact resistance is excellent, and therefore, even if elastic powder is blended in an amount of 5% or more in particular, a cosmetic having sufficient impact resistance and excellent extensibility to the skin can be obtained. On the other hand, if it exceeds 20 mass%, impact resistance and adhesion to the skin tend to be slightly poor.

Oily component

Examples of the oily component used in the production method of the present invention include natural vegetable oils such as avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg butter, sesame oil, persic oil, wheat germ oil, camellia seed oil, castor oil, linseed oil, safflower oil, cottonseed oil, エノ oil, soybean oil, peanut oil, tea seed oil, coconut oil (カヤ oil), rice bran oil, baitong oil, jatropha oil, jojoba oil, germ oil, and the like; liquid oils such as triglycerol, tricaprylin, and triisopalmitate; waxes such as cocoa butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, wood wax kernel oil (モクロウ kernel oil), hardened oil, neatsfoot oil, wood wax, hardened castor oil, and other animal and vegetable liquid oils and fats, beeswax, candelilla wax, cotton wax, carnauba wax, bay wax, shellac, spermaceti, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, isopropyl lanolate, hexyl laurate, reduced lanolin, jojoba wax, POE lanolin, shellac wax, 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 paraffin, ceresin, squalene, pristane, paraffin, ceresin, squalene, vaseline, and microcrystalline wax; isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyldiol monoisostearate, neopentyl glycol didecanoate, diisostearyl malate, di-2-heptylundecyl glyceride, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glycerol tri-2-ethylhexanoate, isopropyl myristate, hexyl myristate, decyl lactate, decyl stearate, lanolin, isopropyl stearate, isopropyl myristate, decyl stearate, isopropyl myristate, hexyl laurate, Trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, glyceryl tri-2-heptylundecanoate, methyl ricinoleate, oleyl oleate (オレイン acid オイル), cetostearyl alcohol, acetin, 2-heptylundecanoate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, ethyl acetate, isopropyl palmitate, Synthetic ester oils such as butyl acetate, amyl acetate, triethyl citrate, and the like; silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane decamethylpolysiloxane (メチルハイドロジエンポリシロキサンデカメチルポリシロキサン), dodecamethylpolysiloxane, tetramethyltetrahydropolysiloxane (テトラメチルテトラハイドロジエンポリシロキサン), fluorine resins, acrylic resins, and the like. The oily component may be used in combination of 1 or 2 or more.

In the production method of the present invention, the oily component preferably contains a high-viscosity oil component having a viscosity of 100 to 50000 mPas at 25 ℃. The viscosity can be measured by a B-type viscometer or the like, and for a non-newtonian fluid, the viscosity is measured at 12 rpm. In the conventional production method, it is very difficult to uniformly disperse the high-viscosity oil component in the powder, but according to the production method of the present invention, when such a high-viscosity oil component is used, the high-viscosity oil component can be uniformly coated on the surface of the powder particles by using a rotary vane opposing type mixing device having a specific structure, and therefore, a powder cosmetic excellent in adhesion to the skin, cosmetic durability, and the like can be obtained. Further, even when the powder is treated with a highly oil-repellent fluorine compound and a highly viscous oil component, the powder component does not aggregate, and a powder cosmetic having a uniform appearance and excellent in usability can be obtained.

Examples of the high-viscosity oil component used in the production method of the present invention include silicone oils such as hydrogenated polyisobutylene, triisostearin, diisostearyl malate, dimethylpolysiloxane and/or diphenyldimerimethylsiloxane, dimer acids such as castor oil, di (isostearyl-phytosterol) dimerized linoleate and/or dilinolein diisostearate, and dilinolein dimerized linoleate, and derivatives of dimer acids and dimer alcohols.

In the powder cosmetic obtained by the production method of the present invention, the blending amount of the oil component is preferably 3 to 35% by mass, and more preferably 7 to 20% by mass. If the amount of the oil component blended is less than 3% by mass, it is difficult to obtain a powder cosmetic which is sufficiently satisfactory in practical properties such as adhesion to the skin and/or a moist feeling and impact resistance, while if it exceeds 35% by mass, it is difficult to obtain a powder cosmetic which is sufficiently satisfactory in spreadability to the skin and/or cosmetic durability.

The amount of the highly viscous oil component to be used in the present invention is preferably 0.005 parts by weight or more and 0.5 parts by weight or less, more preferably 0.01 parts by weight or more and 0.15 parts by weight or less, based on 1 part by weight of the fluorine compound-treated powder, from the viewpoint of adhesion to the skin and/or spreadability on the skin.

Mixing device with opposite rotating wings

In the production method of the present invention, the apparatus used for mixing the powder component and the oily component is a rotary-vane opposing mixing apparatus as follows: a1 st rotor blade and a 2 nd rotor blade, which are provided with a plurality of blades, are arranged in a mixing chamber in a facing state such that the 1 st rotor blade and the 2 nd rotor blade have rotating shafts on the same axis, and the raw material is supplied from an inlet on the 1 st rotor blade side, and the raw material is mixed by rotating the 1 st rotor blade and the 2 nd rotor blade in the same or opposite directions to each other, and the mixed raw material is discharged from an outlet on the 2 nd rotor blade side.

By mixing the powder component and the oily component using the rotary wing opposing type mixing device having the specific structure, the oily component can be uniformly coated on the surface of the powder particles without causing aggregation of the powder component. Further, since the rotary blade opposed type mixing device used in the present invention is a dry mixing device, it is not necessary to dissolve the powder component and the oily component in an appropriate mixing solvent for use, and the manufacturing process is simple and there is less problem in terms of safety and/or environment, as compared with the case of wet mixing.

The mixing device of the rotary-vane opposed type used in the present invention is used as a device conventionally used for pulverization, and is known to those skilled in the art as a pulverization device. For example, the mixing device of the present invention may be a pulverizing device described in Japanese patent application laid-open Nos. 2002-79183, 2003-1127, 2003-10712, 2003-71307, or the like. Further, サイクロンミル (フロ - テツク, manufactured by seikagaku corporation) can be mentioned as a commercially available device.

Fig. 1 is a schematic view of an example of a rotary-vane-opposed mixing device used in the production method of the present invention. The rotating-blade-opposed mixing device used in the present invention is not limited to this.

In the mixing device 10 of the opposed rotor blade type, the 1 st rotor blade 14 and the 2 nd rotor blade 15 which are rotationally driven by the engines 12 and 13 are provided in the mixing chamber 11 so as to be opposed to each other on the same axis, the 1 st rotor blade 14 side of the mixing chamber 11 communicates with the raw material inlet 16, and the 2 nd rotor blade 15 side of the mixing chamber 11 communicates with the outlet 17. Further, a raw material supply device 20 is provided above the inlet 16 of the mixing device 10 of the opposed-rotor type, and the tip of the outlet 17 is connected to the collection device 30 (and the collection container 32) and the suction device 40.

In the rotor-opposed type mixing device 10, the 1 st rotor blade 14 and the 2 nd rotor blade 15 disposed to be opposed to each other on the same axis rotate integrally with the rotation shafts of the engines 12 and 13. In the counter-rotor-blade type mixing device 10, the raw material of the mixture to be mixed is fed from the raw material inlet 16 by the raw material feeder 20 while the 1 st rotor blade 14 and the 2 nd rotor blade 15 are rotated at high speed in the same direction or in opposite directions by the engines 12 and 13. The raw material mixture fed into the mixing device 10 of the opposed-rotor type collides with the 1 st rotor 14, the 2 nd rotor 15 or the inner wall surface of the mixing chamber 11, and the raw material components collide with each other, whereby the raw material components are uniformly mixed and dispersed. Therefore, as a result, a mixture in which the oily component is uniformly coated on the surface of the powder particles is obtained without the powder component agglomerating.

Further, the 1 st and 2 nd rotary wings 14 and 15 facing each other rotate in the same direction or in opposite directions to each other. Here, in the manufacturing method of the present invention, it is preferable that the 1 st rotor blade and the 2 nd rotor blade be used by rotating in opposite directions. Since a larger shear stress can be generated by rotating the powder components in opposite directions to each other than when they are rotated in the same direction, the powder components are less likely to aggregate and a uniform mixture is easily obtained. The rotation speed of the 1 st rotor blade 14 and the 2 nd rotor blade 15 can be appropriately adjusted, for example, between 1000 and 10000rpm, preferably between 3000 and 8000 rpm.

The 1 st rotor blade 14 and the 2 nd rotor blade 15 are provided with a plurality of blades in a radial shape around a projection attached to the rotation shaft of the engines 12 and 13, respectively. For 1 rotating wing, the number of the wings is usually about 2-16. In the 1 st rotary wing 14 and the 2 nd rotary wing 15, the shapes of the rotary wings, the number of wings, and the like may be the same or different from each other.

The object mixture mixed in the mixing chamber 11 is discharged from the discharge port 17. The tip of the discharge port 17 is connected to the trap device 30 and the suction device 40. The target mixture is continuously discharged from the discharge port 17 by the operation of the suction device 40, and the discharged target mixture is collected in the collection device 30 and collected in the collection container 32. The operating conditions of the suction device 40 may be appropriately adjusted according to the kind and/or amount of the control mixture, the rotation speed of the rotary wing, and the like. In addition, in a state where the suction device 40 and the trapping device 30 are operated, the mixture raw material is continuously charged by the raw material supply device 20, and the mixture can be continuously produced.

Although the powder component and the oily component may be fed into the rotary-blade-opposed-type mixing device 10 separately or simultaneously, in general, they are preferably premixed by a simple stirring device such as a henschel mixer or a nauta mixer. If the light powder component is put into the rotary-vane opposing type mixing device 10 without premixing, it is difficult to control the mixing process, for example, only the light powder component is first discharged without being sufficiently mixed with the oily component.

In the production method of the present invention, for example, in the case of producing a powdery solid cosmetic such as a foundation cream, a mixture of the powdery component and the oily component obtained as described above is usually filled into a petri dish container of, for example, a metal or a resin, and solidified by dry molding. As a method for solidification, conventionally known dry press molding or the like can be used.

In the powder cosmetic produced by the production method of the present invention, other components used in external skin preparations such as cosmetics and/or pharmaceuticals, for example, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, a humectant, a water-soluble polymer, a thickener, a skin film agent, an ultraviolet absorber, a chelating agent, a lower alcohol, a polyhydric alcohol, a sugar, an amino acid, an organic amine, a polymer emulsion, a pH adjuster, a skin nutrient, a vitamin, an antioxidant auxiliary, a fragrance, water, and the like may be appropriately blended as necessary within a range not to impair the effects of the present invention, and may be produced by a conventional method according to the target formulation.

The production method of the present invention is preferably applied to powdery or solid powdery cosmetics such as foundation cream, eye shadow, cheek color, toilet powder, perfume powder, baby toilet powder, pressed powder, deodorant powder, and incense powder.

Examples

The present invention will be described in more detail with reference to examples. The present invention is not limited to these examples. The blending amount is expressed in mass% unless otherwise specified.

First, the evaluation method used in the present example will be explained.

< evaluation of practical Properties >

With respect to the powder cosmetics obtained in each of examples and comparative examples, 20 female members touched the powder cosmetics with fingers to evaluate the granular feeling of the powder, and then each of the cosmetics was applied to half of the face each time in divided portions, and the moist feeling and smooth feeling, the powdery feeling, the uniform appearance, and the makeup durability after 3 hours were respectively evaluated in comparison.

17 or more answers good-

12 to 16O

9 to 11 Δ

From 5 to 8 in a book

4 or less

< impact resistance evaluation >

The powder cosmetics obtained in each of examples and comparative examples were press-molded in a resin, and placed in a cosmetic case container as a sample. The samples were dropped horizontally from a height of 30cm on an iron plate having a thickness of 20mm, and the number of drops until breakage was evaluated as the impact resistance.

The present inventors produced powder cosmetics (foundation cream) of example 1 and comparative example 1 according to the formulation shown in table 1 below, and evaluated practical properties and impact resistance of each of the obtained powder cosmetics using the above evaluation criteria.

In the powder cosmetic of example 1, the oily component was added to the powder components in the formulation, and the mixture was mixed for a predetermined time by a henschel mixer (mitsui chemical mechanism), and then mixed 2 times by a rotary wing opposing type mixing device (サイクロンミル: フロ — テツク) of fig. 1, and dry-press-molded in a resin dish. On the other hand, in the powder cosmetic of comparative example 1, the oily component was added to the powder components of the same formulation as in example 1, and the mixture was mixed by a henschel mixer, and then mixed 2 times by a pulverizer (manufactured by ホソカワミクロン) as a hammer mill, and dry press-molded in a resin pan.

[ Table 1]

Foundation cream	Example 1	Comparative example 1
			Sericite synthetic mica talc titanium oxide red interference pearlescent pigment zinc oxide iron oxide red interference iron oxide yellow iron oxide black spherical silicone elastic powder 1 spherical nylon powder dimethyl polysiloxane (5 mPa.S) dimethyl polysiloxane (5000 mPa.S) squalene vaseline sorbitan sesqui isostearate p-hydroxybenzoate antioxidant perfume	Proper amount of 1010 allowance 11220.820.16432321	Proper amount of 1010 allowance 11220.820.16432321
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	O 12 times-	Δ 5 times

The corresponding side 1 (vinyldimethylsiloxane/polymethylsiloxane silsesquioxane) crosslinked polymer (KSP-100: manufactured by shin-Etsu chemical Co., Ltd.) was 2.0%

(Diphenyldimedone/vinyldiphenyldimedone/silsesquioxane) crosslinked polymer (KSP-300: manufactured by shin-Etsu chemical Co., Ltd.) 2.0%

(Dimethicone/vinyl-dimethicone) crosslinked polymer (トレフイル E-506: east レ. ダウコ - ニング Co., Ltd.) 2.0%

As shown in table 1, the powder cosmetic of example 1 using the rotary blade opposed type mixing device was excellent in various practical characteristics such as granular feeling, moist feeling, smooth feeling, powdery feeling, uniform appearance, and makeup durability, and also had good impact resistance.

On the other hand, in comparative example 1 using a pulverizer (hammer mill), although the smooth feeling was slightly good, no excellent evaluation was obtained in other practical characteristics, and the impact resistance was also evaluated to be half or less of that of example 1.

Next, various evaluations were performed in the same manner as in table 1 using various powder cosmetic formulations shown in tables 2 to 5 below. The method for producing each powder cosmetic was the same as that of example 1 and comparative example 1. The evaluation results are shown in tables 2 to 5.

[ Table 2]

Foundation cream	Example 2	Comparative example 2
			Silicone treatment sericite silicone treatment mica silicone treatment talc silicone treatment aluminum titanium oxide stearate treatment particulate titanium oxide silicone treatment iron oxide red silicone treatment iron oxide yellow silicone treatment iron oxide black polyurethane powder Fine Zinc oxide p-hydroxybenzoate Dimethylpolysiloxane (5 mPaS) hydrogenated Isopolybutylene (20000 mPaS) Methylphenylpolysiloxane Octylmethoxycinnamate polyether Silicone antioxidant fragrance	Appropriate amount of 32331 in balance of 12, 231241.22.50.952 and appropriate amount	Appropriate amount of 32331 in balance of 12, 231241.22.50.952 and appropriate amount
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	O 10 times-	X.DELTA.O.DELTA.4 times

[ Table 3]

Foundation cream	Example 3	Comparative example 3
			Silicone treatment sericite Silicone treatment mica Silicone treatment talc Silicone treatment aluminum titanium oxide stearate treatment particles titanium oxide Silicone treatment iron oxide Red Silicone treatment iron oxide yellow Silicone treatment iron oxide Black polyurethane powder Fine Zinc oxide Chlorophytin Ether Dimethicone (1000 mPaS) Triisostearyl Ether Methylphenylpolysiloxane Octylmethoxycinnamate polyether Silicone antioxidant fragrance (6000 mPaS)	Appropriate amount of 32331 in balance of 12, 231241.22.50.952 and appropriate amount	Appropriate amount of 32331 in balance of 12, 231241.22.50.952 and appropriate amount
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good 10 times	X6 times

[ Table 4]

Foundation cream	Example 4	Comparative example 4
			Fluoroacrylic acid-treated sericite Fluoroacrylic acid-treated mica Fluoroacrylic acid-treated Talc Fluoroacrylic acid-treated aluminum oxide stearate treated particulate titanium Fluorotitanium oxide Fluoroferric oxide Black Silicone elastic powder 2 spherical polyethylene powder blue interference-system pearlescent pigment Fine Zinc oxide Fine silica p-hydroxybenzoate Dimethylpolysiloxane (100 mPa.S) Dimethylpolysiloxane (5000 mPa.S) Methylphenylpolysiloxane Octylmethoxycinnamate polyether Silicone antioxidant fragrance	Appropriate amount of 33231 with the balance of 10, 281241.22.50.963371	Appropriate amount of 33231 with the balance of 10, 281241.22.50.963371
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good-	Δ 5 times

2 (vinyldimethylsiloxane/polymethylsilsesquioxane) crosslinked polymer (KSP-100: manufactured by shin-Etsu chemical Co., Ltd.) 2.0%

(Diphenyldimedone/vinyldiphenyldimedone/silsesquioxane) crosslinked polymer (KSP-300: manufactured by shin-Etsu chemical Co., Ltd.) 4.0%

[ Table 5]

Face powder (pressed powder)	Example 5	Comparative example 5
			The metallic soap-treated talc synthetic mica zinc oxide red interference pearlescent pigment particle titanium oxide spherical elastic silicone powder is 3 dimethyl polysiloxane (5000 mPa.S) diisostearyl malate (2000 mPa.S) squalene ester oil p-hydroxybenzoate antioxidant perfume	Proper amount of the balance 15533102122	Proper amount of the balance 15533102122
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine particlesMoist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Δ very good 11 times	Δ X. Δ 4 times

Orange 3 (vinyl dimethyl siloxane/polymethylsiloxane silsesquioxane) cross-linked polymer (KSP-100: manufactured by shin-Etsu chemical Co., Ltd.)

As shown in tables 2 to 5, the powder cosmetics of examples 2 to 5 using the rotary blade facing type mixing device were superior to the powder cosmetics of comparative examples 2 to 5 using the crusher in various practical characteristics such as grainy feeling, moist feeling, smooth feeling, powdery feeling, uniform appearance, and also had good impact resistance.

[ Table 6]

Foundation cream	Example 6	Comparative example 6
			1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%) treated sericite 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%) treated mica 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%) treated talc barium sulfate titanium oxide red interference pearlescent pigment zinc oxide iron oxide red iron oxide yellow iron oxide black spherical silicone elastic powder ^ 1 spherical nylon powder silylated silica dimethylpolysiloxane (5 mPa.S) dimethyl polysiloxane (5000 mPa.S) squalene vaselineSorbitan sesquiisostearate chlorphenesin antioxidant fragrance	1015 the balance 1515220.820.164232321 and proper amount	1015 the balance 1515220.820.164232321 and proper amount
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good 13 times	Δ ≈ Δ ×.6 times

As shown in table 6 above, the powder cosmetic of example 6 using the rotary wing opposing type mixing device was excellent in various practical characteristics such as granular feeling, moist feeling, smooth feeling, powdery feeling, uniform appearance, and makeup durability and also in impact resistance regardless of whether or not the fluorine-treated powder 1H, 2H-perfluorooctyltriethoxysilane (chemical (I)) and the high-viscosity oil component dimethylpolysiloxane (5000mPa · S) were used in combination.

On the other hand, in comparative example 6 using a pulverizer (hammer mill), although the smooth feeling was slightly good, no excellent evaluation was obtained in other practical characteristics, and the impact resistance was also evaluated to be half or less of that of example 6.

The above formula (I) is represented by the following formula.

(chemical formula I)

CF₃CF₂CF₂CF₂CF₂CF₂CH₂CH₂Si(OEt)₃ (I)

Next, various evaluations were performed in the same manner as in table 6 using various powder cosmetic formulations shown in tables 7 to 10 below. The production methods of various powder cosmetics were the same as in example 6 and comparative example 6. The evaluation results are shown in tables 7 to 10.

[ Table 7]

Foundation cream	Example 7	Comparative example 7
			1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%) treatment of sericite 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%) treatment of mica 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (5%) treated Talcum boron nitride Silicone treated aluminum titanium oxide stearate treated particulate titanium oxide Silicone treated iron oxide yellow Silicone treated iron oxide Black polyurethane powder Fine Zinc oxide silylated silica p-hydroxybenzoate Dimethylpolysiloxane (5 mPa. S) hydrogenated Isopolybutene (20000 mPa. S) Methylphenylpolysiloxane octylmethoxy cinnamate Ockerilin (オクトグリレン) sorbitan sesquiisostearate antioxidant fragrance	Proper amount of 322.5310.5 for 9 balance 2851041.22.60.41012	Proper amount of 322.5310.5 for 9 balance 2851041.22.60.41012
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good 10 times	Delta 4 times

[ Table 8]

Foundation cream	Example 8	Comparative example 8
			1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%)/copolymer of formula (II) (2%) treated sericite 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%)/copolymer of formula (II) (2%) treated mica 1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane (5%)/copolymer of formula (II) (2%) treated talc synthetic mica Silicone treated aluminum oxide stearate treated particulate titanium oxide Silicone treated iron oxide Red Silicone treated iron oxide yellow Silicone treated iron oxide Black polyurethane powder Fine Zinc oxide Chlorobenzylglycerol ether Dimethylpolysiloxane (1000 mPa. S) Triisostearic acid Glycerol ester (6000 mPa. S) Methylphenylpolysiloxane Octylmethoxycinnamate Ockerine polyether Silicone antioxidant fragrance.	Proper amount of 323211 for 12 residues, 2316841.22.50.952	Proper amount of 323211 for 12 residues, 2316841.22.50.952
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good 16 times	X.DELTA.8 times

The chemical formula (II) shown in table 8 is represented by the following formula.

(chemical II)

[ Table 9]

Foundation cream	Example 9	Comparative example 9
			1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%)/copolymer of formula (II) (2%) treated sericite 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%)/copolymer of formula (II) (2%) treated mica 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%)/copolymer of formula (II) (2%) treated talc 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (3%) treated particulate aluminum titanates 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (3%) treated iron oxide Red 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (3%) (treated iron oxide yellow 1H, 1H), 2H, 2H-perfluoro octyltriethoxysilane (3%) treated iron oxide black silicone elastic powder 2 spherical polyethylene powder blue interference system pearlescent pigment fine zinc oxide fine silicon dioxide p-hydroxybenzoate dimethyl polysiloxane (100 mPa.S) dimethyl polysiloxane (5000 mPa.S) methylPhenylpolysiloxane octyl methoxycinnamate polyether silicone antioxidant fragrance	Appropriate amount of 33231 with the balance of 10, 281241.22.50.963371	Appropriate amount of 33231 with the balance of 10, 281241.22.50.963371
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good-	Δ 5 times

[ Table 10]

Face powder (pressed powder)	Example 10	Comparative example 10
			Metallic soap treated talc synthetic mica zinc oxide red interference pearlescent pigment particle titanium oxide spherical elastic silicone powder is separately added 31H, 1H, 2H, 2H-perfluoro octyl triethoxysilane (5%)/copolymer of formula (II) (2%) treated talc dimethyl polysiloxane (5000 mPa.S) diisostearyl malate (2000 mPa.S) squalene ester oil chlorphenesin antioxidant perfume	Proper amount of the balance 1553310252122	Proper amount of the balance 1553310252122
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding	Premixing ↓withHenschel Mixer and mixing 2 times ↓witha pulverizer into a resin bowl for dry pressure molding
			Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	Very good-	Δ ≈ 4 times

As shown in tables 7 to 10, the powder cosmetics of examples 7 to 10 using the rotary blade facing type mixing device were excellent in various practical characteristics such as granular feeling, moist feeling, smooth feeling, powdery feeling, uniform appearance and the like and also in impact resistance, regardless of whether or not the fluorine-treated powder and the high-viscosity oil component were used in combination, as compared with the powder cosmetics of comparative examples 7 to 10 using the pulverizer.

Further, the particle state of the powder component/oily component mixture obtained in example 4 and comparative example 4 was photographed by a scanning electron microscope (VE-8800, manufactured by KEYENCE). The photograph is shown in FIG. 2.

As indicated in fig. 2, it was confirmed that: the mixture of example 4 using the rotating-blade counter type mixing device was coated with the oil component uniformly on the powder surface in a substantially primary-particle state. In contrast, it is known that: in comparative example 4 using a pulverizer, the particles were larger than those in example 4, and the powder components aggregated.

Next, the powder component/oil component mixtures obtained in example 4 and comparative example 4 were measured for particle size distribution using a laser diffraction/scattering particle size distribution measuring instrument (マイクロトラツク MT3000II, manufactured by Nikkiso K.K.). For comparison, the same test was also conducted on a premix obtained from a Henschel mixer. The results are shown in FIG. 3.

As shown in fig. 3, it can be seen that: in the premix, the powder components aggregate, and the particle size distribution is also very broad. Further, it can be seen that: when the mixture of comparative example 4 using a pulverizer was compared with the premix, the peak particle size was reduced and aggregation of the powder components was slightly suppressed.

In contrast, the following were confirmed: the mixture of example 4 using the mixing device of the opposed rotor blades had a further reduced peak particle size and a very sharp distribution. That is, it can be understood that when a rotary-vane opposing type mixing device is used, a mixture in which the powder component is uniformly mixed with the oil component while suppressing aggregation of the powder component and the oil component is uniformly coated on the surface of the powder in a substantially primary particle state can be obtained.

Then, the present inventors studied the mechanism of improvement of the production method of the present invention. Powder cosmetics (foundation cream) were produced by the following formulation shown in table 11, and the practical properties and impact resistance of each of the obtained powder cosmetics were evaluated according to the above evaluation criteria.

[ Table 11]

As shown in Table 11, when a powdery cosmetic was produced by blending 2 mass% of an elastic powder by a conventional dry method (production example 3-1), the feeling of use such as moist feeling and smooth feeling was poor, and the impact resistance was excellent. On the other hand, when 5 mass% of an elastic powder was blended by the same dry method (production example 3-2), the workability showed a somewhat good result, but the evaluation of the uniform appearance and the impact resistance was poor.

The results of production examples 3-1 and 3-2 show that the powder cosmetic compositions produced by blending a large amount of the elastic powder by the conventional dry method are inferior in impact resistance.

Then, the above evaluation was performed by appropriately changing the blending amount of the elastic powder and the oil component by a conventional wet method. As a result, when 5 mass% of the elastic powder was blended and a small amount of the oily component was blended (production example 2-1), though the use property such as smooth feeling was excellent by containing a large amount of the elastic powder, the impact resistance was poor and the oily component was small, so that the appearance was not sufficiently uniform. On the other hand, when the elastic powder was kept at 5 mass% and the amount of the oily component blended was increased (production example 2-2), good results were obtained in terms of impact resistance to maintain moldability, but the workability was poor because a large amount of oil was blended. The same evaluation results were obtained when 10 mass% of the elastic powder was blended (production examples 2 to 3).

Here, it can be seen that: when a powdery cosmetic material is produced by the production method of the present invention using the same formulation as described above (production examples 1-1 to 1-3), a powdery cosmetic material having excellent impact resistance can be obtained even when elastic powder is blended to some extent, unlike the case where the conventional production method described above is used. Further, it can be seen that: even when a high oily component is blended, excellent feeling in use can be obtained. As a result, it was found that since the elastic powder can be sufficiently contained without blending a large amount of the oil component, a powdery cosmetic having good spreadability and excellent feeling in use such as moist feeling and smooth feeling can be obtained.

As described above, in the case of manufacturing a powdery cosmetic by blending a large amount of elastic powder by the conventional dry method, there is a problem in impact resistance, and in the case of using the wet method, a large amount of oil can be blended to solve the problem of impact resistance, but the usability is deteriorated due to the large amount of oil.

However, it can be seen that: when the production method of the present invention is used, a large amount of elastic powder, which has not been blended by the conventional production methods, can be contained, and thus the usability is excellent. Further, even if the blending amount of the oil component is small, since the powder component and the oil component are well homogenized, the powder cosmetic having high impact resistance can be produced, and therefore, the limitation of the blending amount of the oil component is small, and powder cosmetics having various feelings in use can be blended.

Next, the present inventors studied the blending amount of the preferred elastic powder used in the present invention.

[ Table 12]

Foundation cream	Production examples 4-14-24-34-44-54-64-7
		Silicone-treated sericite silicone-treated mica silicone-treated aluminum titanium oxide stearate treated particulate titanium oxide silicone-treated iron oxide red silicone-treated iron oxide yellow silicone-treated iron oxide black silicone-based elastic powder 2 spherical polymethyl methacrylate powder fine zinc oxide parahydroxybenzoate dimethylpolysiloxane (5 mpa.s) hydrogenated isopolybutene (20000 mpa.s) methyl phenyl polysiloxane octylmethoxy cinnamate polyether silicone antioxidant fragrance	12121212121212 balance, balance 232323232323231212121212121244444441.21.21.21.21.21.21.22.52.52.52.52.52.52.50.90.90.90.90.90.90.90251015202555555552222222 right amount, right amount 33333332222222333333333333331111111, a proper amount of
Method for producing	Premixing ↓witha Henschel Mixer and mixing 2 times ↓witha rotary-vane opposed mixing device in a resin bowl for dry pressure Molding
		Fine granular moist feeling, smooth feeling, powdery feeling, uniform appearance, and durable impact resistance	4. very good 5. very good 6. very good 7. very good 1. very good 3. very good 9. very good 0. very good 1. very good 2. very good 3. very good 6. very good 7. very good 8. very good 5. very good 9. very good 1. very good 2. very good 3. very good 4. very good 10. very good 12. very good 8

The results in Table 12 show that the composition was excellent in impact resistance and good in feeling in use, but slightly poor in smooth feeling and uniform appearance, both in the case where the elastic powder was not blended at all (production example 4-1) and in the case where the elastic powder was blended at 2 mass% (production example 4-2). In addition, when more than 25 mass% of the elastic powder was blended (production examples 4 to 7), the workability was good, but the impact resistance was slightly poor.

Therefore, it is found that when the production method of the present invention is used, the elastic powder to be blended in the powdery cosmetic is particularly preferably in the range of 5.0 to 20.0 mass%. By the production method of the present invention, it is possible to realize very excellent workability and high impact resistance, while blending a large amount of an elastic powder.

Then, the present inventors studied the mechanism of improvement of the production method of the present invention and the preferable blending amount of the fluorine-treated powder used in the present invention. The powder cosmetics (foundation cream) of production examples 5-1 to 5-6, 6-1 to 6-5 were produced by the production method of the present invention using the formulations shown in Table 13 below, and the practical properties and impact resistance of each of the obtained powder cosmetics were evaluated using the above evaluation criteria.

[ Table 13]

As shown in the right column of Table 13, when the fluorine-treated powder was blended by changing the conventional dry method as appropriate, if the fluorine-treated powder was blended in an amount of 5% by mass or more, the cosmetic composition was excellent in durability, but poor in adhesion to the skin, and therefore poor in usability (production examples 6-2 to 6-5). In addition, in the same dry method, the cosmetic durability was poor when the fluorine-treated powder was not blended at all (production example 6-1).

On the other hand, as shown in the left column of table 6 above, it is shown that: when a powdery cosmetic is produced by using the rotary-vane opposed mixing device of the present invention, unlike the case of using the conventional production method, a powdery cosmetic having a uniform appearance and excellent usability without causing aggregation of the powder is obtained even when 5 to 75 mass% of fluorine-treated powder is blended to some extent (production examples 5-2 to 5-6).

As described above, the upper limit of the preferable blending amount of the fluorine-treated powder to be blended in the powdery cosmetic composition obtained by the production method of the present invention is not particularly limited, but is preferably 5 to 75% by mass, and more preferably 20 to 65% by mass.

Then, the present inventors have studied a preferable blending amount of the high-viscosity oil component.

[ Table 14]

As shown in the right column of Table 14, when the fluorine-treated powder was fixed at 40% by mass and blended with a suitable change in the content of the highly viscous oil by the conventional dry method, the impact resistance was improved to some extent by increasing the content of the highly viscous oil, but the handling property was poor (production examples 8-1 to 8-4). On the other hand, as shown in the left column of table 7, in the case of producing a powdery cosmetic by using the rotary blade opposed type mixing device of the present invention, unlike the case of using the conventional production method, a powdery cosmetic having a uniform appearance and excellent usability without causing aggregation of the powder is obtained even when the fluorine-treated powder is fixed to 40% by mass and the high-viscosity oil is blended in an amount of 0.1 to 10% by mass as in the above-mentioned formulation (production examples 7-2 to 7-5).

However, if more than 10 mass% of the high-viscosity oil component is blended, the uniform appearance and the workability tend to be slightly deteriorated. (production examples 7 to 6).

As described above, the amount of the high-viscosity oil component blended in the powdery cosmetic composition obtained by the production method of the present invention is preferably 0.1 to 10% by mass, and more preferably 0.5 to 5% by mass.

(preparation method) to the powder components in the prescription, adding oily components, and mixing with Henschel mixer for a certain time, then using figure 1 rotating wing opposite type mixing device mixing 2 times, in resin vessel dry pressure molding.

The powder cosmetics obtained in examples 11 to 14 were excellent in various practical properties such as grainy feel, moist feel, smoothness, powdery feel and uniform appearance, and also had good impact resistance.

Claims

1. A method for producing a powdery cosmetic by dry-mixing 65-97% by mass of a powdery component and 3-35% by mass of an oily component as a binder, characterized in that,

the dry mixing device is a mixing device with opposite rotating wings as follows: a1 st rotor blade and a 2 nd rotor blade, each having a plurality of blades, are arranged in a mixing chamber in a facing state such that the 1 st rotor blade and the 2 nd rotor blade have respective rotation shafts on the same axis in a horizontal direction, and the raw materials are supplied from an inlet on the 1 st rotor blade side, mixed by rotating the 1 st rotor blade and the 2 nd rotor blade in the same or opposite directions to each other, and discharged from an outlet on the 2 nd rotor blade side.

2. A method for producing a powdery cosmetic material according to claim 1, wherein the 1 st rotary wing and the 2 nd rotary wing in the mixing device having the rotary wings facing each other are used while being rotated in opposite directions to each other.

3. The method for producing a powdery cosmetic material according to claim 1 or 2, characterized in that the powdery component comprises a fluorine compound-treated powder.

4. A method for producing a powdery cosmetic material according to claim 1 or 2, wherein the elastic powder is contained in the powdery component in an amount of 5.0 to 20.0 mass% based on the total amount of the powdery cosmetic material.

5. A method for producing a powder cosmetic according to claim 1 or 2, characterized in that the oil component contains 0.1 to 10% by weight of an oil component having a viscosity of 100 to 50000 mPaS based on the total amount of the powder cosmetic.

6. A method for producing a powdery cosmetic composition according to claim 5,

the powder component contains 5-75% by mass of fluorine compound-treated powder relative to the total amount of the powder cosmetic.