Elastomer

Abstract

Provided is an elastomer that improves the skin feel of an inorganic powder. The elastomer according to the present invention is an elastomer comprising: (A) an amino group-containing silicone polymer; and (B) a carboxyl group-containing silicone polymer or a carboxyl group-containing acrylamide polymer, wherein a molar ratio Y/X between amino groups and carboxyl groups is within a range of 0.1 to 1.2, wherein Y denotes the molar amount of carboxyl groups contained in the component (B), and X denotes the molar amount of amino groups contained in the component (A).

Claims

1. An elastomeric mixture of polymers, comprising: (A) an amino group-containing silicone polymer represented by a general formula (1): ##STR00005## wherein X is an alkyl group having 1 to 18 carbons, and R and R′ are an alkyl group; m is a number between 20 and 2000 and n is a number between 1 and 100; (B) at least one polymer selected from a group consisting of a carboxyl group-containing silicone polymer wherein said silicone polymer is represented by a general formula (2): ##STR00006## wherein R.sup.1 and R.sup.2 are selected from the group consisting of a methyl group and a group represented by formula (4), the total number of groups of formula (4) is 1 to 100 per molecule, and y represents an integer from 1 to 50000: ##STR00007## and (C) a polymer selected from carboxyl group-containing acrylamide polymers represented by a general formula (3): ##STR00008## wherein the molar ratio between amino groups of said (A) polymer and carboxyl groups of said (B) polymer in said elastomer, which is (mol B)/(mol A), is 0.1 to 1.2.

2. An elastomer-coated inorganic powder, wherein: a surface of said inorganic powder is coated with the elastomeric mixture according to claim 1.

3. The elastomer-coated inorganic powder, according to claim 2, wherein: the amount of the elastomeric mixture is in the range of 0.5 to 20% by mass relative to the amount of said inorganic powder.

4. The elastomer-coated inorganic powder, according to claim 2, wherein: said inorganic powder is at least one inorganic powder selected from the group consisting of talc, mica, synthetic phlogopite iron, sericite, barium sulfate, kaolin, titanium oxide, zinc oxide, and iron oxide.

5. A cosmetic, comprising: said elastomer-coated inorganic powder according to claim 2.

6. An elastomer-coated organic powder, wherein: a surface of said organic powder is coated with the elastomeric mixture according to claim 1.

Description

EXAMPLES

(1) Hereinafter, the present invention will be described in detail with reference to Examples. The present invention is not limited by these Examples in any respect. The amounts of components to be incorporated are expressed by % by mass relative to the entire system in which the components are incorporated, unless otherwise specified.

(2) Evaluation methods and criteria used in the following test will be described first.

(3) <Elastomer Coating Test>

(4) In this test, no separation between the original powder and the elastomer was confirmed based on visual inspection and feel to the touch. Additionally, it was also confirmed that the amount of the elastomer was appropriate relative to the amount of the powder charged by elemental analysis and that the coating was appropriate by floating the coated powder on water to check whether it had water repellency.

(5) G (good): The powder is coated with the elastomer.

(6) NG (not good): The powder is not coated with the elastomer.

(7) First, an investigation was conducted on the amounts of the amino group-containing silicone polymer (A) and the carboxyl group-containing silicone polymer (B) to obtain a composition according to the present invention in the form of an elastomer.

(8) Elastomers according to the present invention which had formulations as shown in tables below were prepared by the following production method.

(9) <Production Method>

(10) Each of the elastomers according to the present invention was obtained by mixing and stirring the carboxyl group-containing silicone polymer and the amino group-containing silicone polymer and heating the mixture at 105° C. for 12 hours.

(11) First, the present inventors conducted an investigation on the molar ratio Y/X at which the amino group-containing silicone polymer (A) and the carboxyl group-containing silicone polymer (B) exhibit elastomeric properties, wherein Y denotes the molar amount of carboxyl groups contained in the component (B), and X denotes the molar amount of amino groups contained in the component (A). The ratio Y/X is the ratio [amount (mmol) of carboxyl group]/[amount (mmol) of amino group] calculated from the carboxyl group equivalent and diamino group equivalent determined by NMR.

(12) The formulations of the Test Examples are as shown in Table 1 and Table 2 below.

(13) TABLE-US-00001 TABLE 1 Test Example 1-1 1-2 1-3 1-4 1-5 1-6 (A) Aminoethylaminopropylmethylsiloxane- 2 1.8 1.6 1.4 1.2 1 dimethylsiloxane copolymer (g) (*1) (B) PCA dimethicone (g) (*2) — 0.2 0.4 0.6 0.8 1 mol B/mol A 0.03 0.07 0.12 0.18 0.27 mol A: Molar amount of amine, mol B: Molar amount of carboxylic acid (calculated from NMR data) State Liquid Elastomer

(14) TABLE-US-00002 TABLE 2 Test Example 1-7 1-8 1-9 1-10 1-11 (A) Aminoethylaminopropylmethylsiloxane- 0.8 0.6 0.4 0.2 — dimethylsiloxane copolymer (*1) (B) PCA dimethicone (*2) 1.2 1.4 1.6 1.8 2 mol B/mol A 0.41 0.64 1.1 2.5 mol A: Molar amount of amine, mol B: Molar amount of carboxylic acid (calculated from NMR data) State Elastomer Liquid

(15) (*1) KF-8004 (Shin-Etsu Chemical Co., Ltd.)

(16) .sup.1H-NMR of KF-8004 was measured, and the diamine equivalent was calculated to be 3090.4 g/mol from an integral of a signal derived from CH.sub.3 and an integral of a signal derived from —CH.sub.2—.

(17) (*2) SENSASIL PCA (Croda, Inc.)

(18) .sup.1H NMR of SENSASIL PCA was measured, and the carboxyl equivalent was calculated to be 5631 g/mol from an integral of a signal derived from CH.sub.3 and an integral of a signal derived from —CH.sub.2—.

(19) It was found that elastomers were obtained by the formulations of Test Examples 1-4 to 1-9.

(20) It was therefore found that the molar ratio Y/X between amino groups and carboxyl groups of 0.1 to 1.2 was advantageous.

(21) Next, the present inventors conducted an investigation on whether a carboxyl group-containing acrylamide polymer could alternatively be used as another component (B).

(22) TABLE-US-00003 TABLE 3 Test Example 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 (A) Aminoethylaminopropylmethylsiloxane- 1 1 1 1 1 1 1 1 dimethylsiloxane copolymer (*1) (B) COOH-containing acrylamide polymer 1 0.5 0.33 0.25 0.2 0.17 0.13 0.1 (*3) mol B/mol A 5.0 2.5 1.7 1.3 1.0 0.8 0.6 0.5 mol A: Molar amount of amine, mol B: Molar amount of carboxylic acid (calculated from NMR data) State Hard solid Elastomer

(23) (*3) The COOH-containing acrylamide polymer was obtained by the following method.

(24) 12-Methacrylamidododecanoic acid (MAD)/2-acrylamido-2-methylpropanesulfonic acid (AMPS) copolymer (90/10)

(25) 18.50 g (65.37 mmol) of 12-methacrylamidododecanoic acid (MAD), 1.50 g (7.24 mmol) of 2-acrylamido-2-methylpropanesulfonic acid (AMPS, available from Sigma-Aldrich Japan K.K.), 0.29 g (7.25 mmol) of sodium hydroxide, and 0.30 g (1.83 mmol) of azobisisobutyronitrile (available from Nacalai Tesque, Inc.) were dissolved in 60.0 g of methanol. The azobisisobutyronitrile was recrystallized from methanol according to an ordinary method before use.

(26) The solution was degassed by bubbling with argon for 60 minutes, after which the container containing the solution was capped with a septum and heated at 60° C. for 20 hours to allow polymerization to proceed. After the completion of the polymerization reaction, the reaction solution was added dropwise into a largely excessive amount of diethyl ether, and the resulting precipitate was collected by suction filtration.

(27) The collected precipitate was then dried under reduced pressure to give 15.2 g of a COOH-containing acrylamide polymer in the form of a random copolymer (yield; 75.1%). The weight-average molecular weight of the COOH-containing acrylamide polymer obtained was 50000.

(28) This led to the conclusion that an elastomer according to the present invention could be obtained also with the use of a carboxyl group-containing acrylamide polymer.

(29) <Elastomer-Coated Inorganic Powder>

(30) As described hereinafter, the present inventors further conducted an investigation on whether various inorganic powders (C) could be coated with an elastomer according to the present invention.

(31) <Production Method>

(32) An inorganic powder (C) and a carboxyl group-containing silicone polymer are placed in a Henschel mixer and mixed at a low speed for 10 minutes. An amino group-containing silicone polymer was then added, followed by mixing at a low speed for 10 minutes and then by heating. In this manner, an elastomer-coated inorganic powder according to the present invention was obtained.

(33) TABLE-US-00004 TABLE 4 Test Example 3-1 3-2 3-3 (A) Aminoethylaminopropylmethylsiloxane- 2 2 2 dimethylsiloxane copolymer (g) (*1) (B) PCA dimethicone (g) (*2) 3 3 3 (C) Talc 95  — — Mica — 95  — Synthetic phlogopite iron — — 95  Coating state G G G

(34) Various Inorganic Powders Listed in Table 4

(35) Talc: Talc JA-68R (available from ASADA MILLING CO., LTD.)

(36) Mica: PDM-9WA (available from TOPY INDUSTRIES, LTD.)

(37) Synthetic phlogopite iron: PDM-FE (available from TOPY INDUSTRIES, LTD.)

(38) Test Examples 3-1 to 3-4 demonstrated that an elastomer according to the present invention could be used to coat various inorganic powders (C).

(39) <Elastomer-Coated Inorganic Powder-Containing Cosmetic>

(40) The present inventors conducted an investigation on the incorporation of an elastomer-coated inorganic powder according to the present invention in a cosmetic.

(41) <Drop Test>

(42) Each of the compositions of Test Examples was dropped from a height of 30 cm five times, and breakage of the formulation was evaluated according to the following criteria.

(43) G (good): Not broken

(44) NG (not good): Broken

(45) <In-Use Feel>

(46) Ten experienced panelists evaluated the in-use feel of each of the compositions of Test Examples by comprehensively considering the non-powderiness, lightness, smoothness, good fit, and skin compatibility that the panelists felt when placing the composition on their palm and applying it to their skin. The compositions were rated according to the following criteria.

(47) A: Nine or more of the ten panelists reported that the in-use feel was good.

(48) B: Six or more and less than nine of the ten panelists reported that the in-use feel was good.

(49) C: Three or more and less than six of the ten panelists reported that the in-use feel was good.

(50) D: Less than three of the ten panelists reported that the in-use feel was good.

(51) <Dry Method of Producing Elastomer-Coated Inorganic Powder-Containing Cosmetic>

(52) Powder components, oil components, and other components, which are shown in the following formulations, were first mixed using a Henschel mixer, and the mixture was then crushed twice using a pulverizer. The resulting mixture was charged into a middle-sized dish made of resin and subjected to dry press forming according to a known method. In this manner, a solid powder cosmetic was obtained.

(53) Subsequently, the present inventors conducted the investigations on the in-use feel and drop impact stability of the cosmetics containing the elastomer-coated inorganic powder according to the present invention.

(54) TABLE-US-00005 TABLE 5 Test Example 4-1 4-2 4-3 4-4 Talc (*4) 40 — — — Talc treated with calcium — 40 — — stearate (*6) Talc treated with silicone — — 40 40 elastomer (*7) Synthetic phlogopite (*10) Rest Rest Rest — Synthetic phlogopite treated Rest with silicone elastomer Titanium oxide treated with 6 6 6 6 alkyl-modified silicone (*11) Colcothar treated with 1.00 1.00 1.00 1.00 alkyl-modified silicone (*13) Iron oxide (yellow) treated 3.00 3.00 3.00 3.00 with alkyl-modified silicone (*14) Iron oxide (black) treated with 0.1 0.1 0.1 0.1 alkyl-modified silicone (*15) Silicic anhydride (*16) 3 3 3 3 Methyl methacrylate 9 9 9 9 crosspolymer (*17) Glyceryl tri-2-ethylhexanoate 7 7 7 7 (*20) Sorbitan sesquiisostearate 1 1 1 1 (*22) Total 100.00 100.00 100.00 100.00 Drop D B B B In-use feel C B A A

(55) (*4) Talc JA-68R (available from ASADA MILLING CO., LTD.)

(56) (*6) Talc ACS-515 (available from FUJIMOTO CHEMICALS CO., LTD.)

(57) (*7) Elastomer-treated talc (Talc JA-68R (A: 2%, B: 3%))

(58) (*10) PDM-9WA (available from TOPY INDUSTRIES, LTD.)

(59) (*11) EP1-CR-50P (available from Daito Kasei Kogyo Co., Ltd.)

(60) (*13) EP1-colcothar #216P (available from Daito Kasei Kogyo Co., Ltd.)

(61) (*14) EP1-ocher #1P (available from Daito Kasei Kogyo Co., Ltd.)

(62) (*15) EP1-BL-100P (available from Daito Kasei Kogyo Co., Ltd.)

(63) (*16) SUNSPHERE L-51S (available from AGC Si-Tech Co., Ltd.)

(64) (*17) MICROSPHERE M-306 (available from Matsumoto Yushi-Seiyaku Co., Ltd.)

(65) (*21) RA-G-308 (available from Nippon Fine Chemical Co., Ltd.)

(66) (*22) ESTEMOL 182V (available from The Nisshin OilliO Group, Ltd.)

(67) Synthetic phlogopite treated with silicone elastomer (PDM-FEA: 2%, B: 3%))

(68) From Test Examples 4-1 to 4-3, the present inventors found that when an elastomer-coated inorganic powder of the present invention was incorporated in a cosmetic, the resulting cosmetic had very excellent in-use feel and drop impact stability.

(69) From Test Example 4-4, it was found that also when an elastomer-coated inorganic powder prepared using an inorganic powder other than talc as a core material was incorporated in a cosmetic, the resulting cosmetic had excellent in-use feel and drop impact stability.

(70) The present inventors conducted an investigation on a cosmetic obtained using a carboxyl group-containing acrylamide polymer as another component (B).

(71) TABLE-US-00006 TABLE 6 Test Example 5-1 Talc treated with 40 acrylamide-silicone elastomer (*7) Synthetic phlogopite (*10) Rest Titanium oxide treated with 6 alkyl-modified silicone (*11) Colcothar treated with 1.00 alkyl-modified silicone (*13) Iron oxide (yellow) treated 3.00 with alkyl-modified silicone (*14) Iron oxide (black) treated with 0.1 alkyl-modified silicone (*15) Silicic anhydride (*16) 3 Methyl methacrylate 9 crosspolymer (*17) Glyceryl tri-2-ethylhexanoate 7 (*20) Sorbitan sesquiisostearate 1 (*22) Total 100.00 Falling (Drop) B In-use fee A

(72) (*7) Talc treated with acrylamide-silicone elastomer (Talc JA-68R, (A): 4.5%, (B): 0.5%)

(73) As seen from Test Example 5-1, it was found that also when an inorganic powder coated with an elastomer formed with the use of a carboxyl group-containing acrylamide polymer was incorporated in a cosmetic, the resulting cosmetic had very excellent in-use feel and drop impact stability.

(74) Further, the present inventors conducted an investigation on whether, when an inorganic powder (C) was coated only with a component (A) or component (B) and the coated inorganic powder was incorporated in a cosmetic, the resulting cosmetic could exhibit the effect of the present invention.

(75) TABLE-US-00007 TABLE 7 Test Example 6-1 6-2 6-3 6-4 Talc (*4) 40 — — Talc treated with — 40 — aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer (*1) Talc treated with PCA dimethicone (*2) 40 Talc treated with silicone elastomer (*7) — — 40 Synthetic phlogopite (*10) Rest Rest Rest Rest Titanium oxide treated with alkyl-modified silicone 6 6 6 6 (*11) Colcothar treated with alkyl-modified silicone (*13) 1.00 1.00 1.00 1.00 Iron oxide (yellow) treated with alkyl-modified silicone 3.00 3.00 3.00 3.00 (*14) Iron oxide (black) treated with alkyl-modified silicone 0.1 0.1 0.1 0.1 (*15) Silicic anhydride (*16) 3 3 3 3 Methyl methacrylate crosspolymer (*17) 9 9 9 9 Glyceryl tri-2-ethylhexanoate (*20) 7 7 7 7 Sorbitan sesquiisostearate (*22) 1 1 1 1 Total 100.00 100.00 100.00 100.00 Falling B D D B In-use feel C B C A

(76) These Test Examples demonstrated that when an inorganic powder (C) coated only with a component (A) or component (B) was incorporated in a cosmetic, the resulting cosmetic could not exhibit the effect of the present invention.

(77) Further, the present inventors conducted an investigation on the order in which the elastomer-forming oil components including the amino group-containing silicone polymer (A) and the carboxyl group-containing silicone polymer (B), the inorganic powder (C), and other oil components were mixed to obtain a cosmetic containing an elastomer-coated inorganic powder according to the present invention.

(78) TABLE-US-00008 TABLE 8 Test Example 7-1 4-3 Talc treated with silicone elastomer — 40 (A) Amino-modified silicone 1.8 — (B) Pyrrolidone carboxylic acid-modified 2.7 — silicone (C) Talc (*4) 40 — Synthetic phlogopite (*10) Rest Rest Titanium oxide treated with alkyl-modified 6 6 silicone (*11) Colcothar treated with alkyl-modified 1 1 silicone (*13) Iron oxide (yellow) treated with 3 3 alkyl-modified silicone (*14) Iron oxide (black) treated with 0.1 0.1 alkyl-modified silicone (*15) Silicic anhydride (*16) 3 3 (D) Methyl methacrylate crosspolymer (*17) 9 9 Oil Glyceryl tri-2-ethylhexanoate (*20) 5 7 component Sorbitan sesquiisostearate (*22) 1 1 Total 100 100 Evaluation Falling B B In-use feel A A

(79) In Test Example 7-1, the inorganic powders (C) including talc to silicic anhydride were mixed with the organic powder (D) using a Henschel mixer, and the amino-modified silicone (A) was then added, followed by mixing using the Henschel mixer.

(80) The pyrrolidone carboxylic acid-modified silicone (B) was further added, followed by mixing using the Henschel mixer. The resulting mixture was then collected into a tray and heated at 105° C. for 12 hours to obtain an elastomer-treated powder mixture.

(81) The elastomer-treated powder mixture and the other oil components were mixed using a Henschel mixer, and the resulting mixture was then crushed twice using a pulverizer.

(82) The resulting powder was charged into a middle-sized dish made of resin and subjected to dry press forming according to a known method. In this manner, a solid powder cosmetic was obtained.

(83) According to the present invention, elastomer coating can be applied collectively to all of the inorganic powder (C) and the organic powder (D) to be incorporated in a cosmetic, and then other oil components can be added to obtain the cosmetic. Specifically, a cosmetic that has good in-use feel and high drop impact resistance was obtained by first mixing all of the inorganic powder and organic powder to be incorporated in the cosmetic, adding the elastomer-forming oil components to the resulting powder mixture, heating the powder mixture together with the elastomer-forming oil components to obtain an elastomer-coated powder mixture, and then adding oil components other than the components (A) and (B) (Test Example 7-1).

(84) TABLE-US-00009 TABLE 9 Test Example 7-2 4-3 Talc treated with silicone elastomer — 40 (A) Amino-modified silicone 0.8 — (B) Pyrrolidone carboxylic acid-modified 1.2 — silicone (C) Talc (*4) 38 — Synthetic phlogopite (*10) Rest Rest Titanium oxide treated with alkyl- 6 6 modified silicone (*11) Colcothar treated with alkyl-modified 1 1 silicone (*13) Iron oxide (yellow) treated with alkyl- 3 3 modified silicone (*14) Iron oxide (black) treated with alkyl- 0.1 0.1 modified silicone (*15) Silicic anhydride (*16) 3 3 (D) Methyl methacrylate crosspolymer (*17) 9 9 Oil Glyceryl tri-2-ethylhexanoate (*20) 5 7 component Sorbitan sesquiisostearate (*22) 1 1 Total 100 100 Evaluation Falling D B In-use feel C/B A

(85) In Test Example 7-2, the inorganic powders (C) including talc to silicic anhydride are placed and mixed in a Henschel mixer. The elastomer-forming oil components (A) and (B) and the other oil components were mixed in advance, and the mixture was added into the Henschel mixer, the contents of which were mixed and stirred. The resulting mixture was crushed twice using a pulverizer. The resulting powder was charged into a middle-sized dish made of resin and subjected to dry press forming according to a known method. In this manner, a solid powder cosmetic was obtained.

(86) If a step of adding the elastomer-forming oil components (A) and (B) used in the technique of the present invention together with the other oil components and then performing heating is employed, the functions intended by the present invention cannot be obtained. Specifically, when a cosmetic was obtained by mixing the inorganic powder and the organic powder to be incorporated in the cosmetic, then adding a mixture of the components (A) and (B) and the other oil components, and heating the resulting mixture, the obtained cosmetic was inferior in the in-use feel and drop impact resistance (Test Example 7-2).

(87) Examples of formulations employed when other inorganic powders (C) coated with an elastomer were incorporated in solid powder cosmetics are listed below.

(88) TABLE-US-00010 TABLE 10 Formulation Example 1-1 1-2 1-3 1-4 Talc treated with silicone 40 40 40 40 elastomer (*7) Synthetic phlogopite (*10) — Rest Rest Rest Synthetic phlogopite iron Rest — — — treated with silicone elastomer Boron nitride treated with — 5 — — silicone elastomer Barium sulfate treated with — — 5 — silicone elastomer Titanium oxide treated with 6 6 6 — alkyl-modified silicone (*11) Colcothar treated with 1.00 1.00 1.00 — alkyl-modified silicone (*13) Iron oxide (yellow) treated 3.00 3.00 3.00 — with alkyl-modified silicone (*14) Iron oxide (black) treated with 0.1 0.1 0.1 0.1 alkyl-modified silicone (*15) Titanium oxide treated with 6 silicone elastomer Iron oxide (red) treated with 1 silicone elastomer Iron oxide (yellow) treated 3 with silicone elastomer Zinc oxide treated with 3 silicone elastomer Silicic anhydride (*16) 3 3 3 3 Methyl methacrylate 9 9 9 9 crosspolymer (*17) Glyceryl tri-2-ethylhexanoate 7 7 7 7 (*20) Sorbitan sesquiisostearate 1 1 1 1 (*22) Total 100.00 100.00 100.00 100.00

(89) <Other Methods of Producing Elastomer-Coated Inorganic Powder-Containing Cosmetic>

(90) An investigation was conducted on whether a solid powder cosmetic containing an elastomer-coated inorganic powder of the present invention could be produced by a production method described in Japanese Patent No. 5422092 in which a slurry prepared using a volatile solvent is dried or by a production method described in Japanese Patent No. 5972437 in which a slurry prepared using a volatile solvent is charged into a container and then the volatile solvent is removed.

(91) Example of Production Method in which Slurry is Dried

(92) The powder components, oil components, and other components, listed below as the formulation A, were mixed first using a Henschel mixer, and the mixture was then crushed twice using a pulverizer. The crushed powder was added to ethyl alcohol, and the powder and ethyl alcohol were mixed using a dispersion mixer. The mixture was subjected to crushing, grinding, and dispersing using a stirred media mill (sand grinder mill) packed with 2-mm-diameter zirconia beads. As a result, a slurry was obtained. The slurry was dried in the form of fine droplets using a stirring dryer (spin flash dryer, available from APV Nordic Anhyro) to obtain a dry powder. The obtained dry powder was charged into a middle-sized dish made of resin and subjected to dry press forming according to a known method. In this manner, a solid powder cosmetic was obtained.

(93) TABLE-US-00011 TABLE 11 Formulation A Talc treated with silicone elastomer Rest Barium sulfate 20 Sericite treated with silicone elastomer 20 Synthetic phlogopite treated with 5 silicone elastomer Synthetic phlogopite 5 Zinc myristate 2 Boron nitride 1 Titanium oxide treated with silicone 11 Iron oxide (red) treated with silicone 0.5 Iron oxide (yellow) treated with silicone 2.5 Iron oxide (black) treated with silicone 0.1 Spherical silicone elastomer powder 5 Spherical nylon powder 5 Vaseline 1 Squalane 2 Diisostearyl malate 1 Octyl methoxycinnamate 1 Dimethicone 1 Sorbitan sesquiisostearate 0.5 Preservative Appropriate amount Antioxidant Appropriate amount Flavor Appropriate amount Total 100.00

(94) Example of Production Method in which Slurry is Charged into Container and then Solvent is Removed

(95) The powder components and oil components, listed below as the formulation B, were mixed using a Henschel mixer, and the mixture was then crushed twice using a pulverizer. To the resulting mixture was added an equivalent amount of water (=volatile dispersion medium), and this was followed by mixing using a dispersion mixer to obtain a slurry. This slurry was charged into a middle-sized dish, and the solvent was removed by suction, followed by drying. In this manner, a solid powder cosmetic was obtained.

(96) TABLE-US-00012 TABLE 12 Formulation B Talc treated with silicone elastomer 12.0 Talc 12.0 Synthetic phlogopite 10.0 Synthetic phlogopite iron 10.0 Boron nitride 5.0 Titanium oxide treated with silicone 7.0 (pigment grade) Titanium dioxide treated with aluminum 4.0 stearate (ultrafine particles) Iron oxide (red) treated with silicone 0.6 Iron oxide (yellow) treated with silicone 2.1 Iron oxide (black) treated with silicone 0.2 Spherical silicone elastomer powder 7.0 Spherical nylon powder 7.0 Chlorphenesin 0.1 Dimethylpolysiloxane 3.0 Methylphenyl polysiloxane 1.0 Glyceryl tri-2-ethylhexanoate 4.0 Octyl methoxycinnamate 5.0 Total 100%

(97) Cosmetics were suitably obtained both by the production method described in Japanese Patent No. 5422092 in which a slurry prepared using a volatile solvent is dried and by the production method described in Japanese Patent No. 5972437 in which a slurry prepared using a volatile solvent is charged into a container and then the volatile solvent is removed.

(98) The following is an example of formulation employed when an inorganic powder (C) coated with an elastomer is incorporated in a solid powder cosmetic used as a solid eyeliner.

(99) TABLE-US-00013 TABLE 13 Formulation Example 2-1 Vaseline 3 Hydrogenated oil 30 Japan wax 10 Stearic acid 12 Trimethylolpropane 5 trioctanoate Titanium mica 10 Titanium oxide treated with 2 silicone elastomer Iron oxide (red) treated with 2 silicone elastomer Iron oxide (yellow) treated 0.5 with silicone elastomer Iron oxide (black) 1 Iron blue 5 Synthetic phlogopite treated Rest with silicone elastomer Total 100.00