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Cellulose acetate-containing particles, cosmetic composition, and method for producing cellulose acetate-containing particles

A technology of cellulose acetate and its manufacturing method, which is applied in the direction of cosmetic preparations, medical preparations containing active ingredients, cosmetics, etc., can solve the problems of limited polymers and difficulty in the manufacture of cellulose acetate particles, and achieve tactile and friendly Excellent oily effect

Pending Publication Date: 2021-11-26
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are limited polymers that can be applied to the production method of synthetic polymer microparticles, and it is difficult to apply to the production of cellulose acetate microparticles.

Method used

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  • Cellulose acetate-containing particles, cosmetic composition, and method for producing cellulose acetate-containing particles
  • Cellulose acetate-containing particles, cosmetic composition, and method for producing cellulose acetate-containing particles
  • Cellulose acetate-containing particles, cosmetic composition, and method for producing cellulose acetate-containing particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0200] Manufacture of cellulose acetate particles

[0201] 100 parts by weight of cellulose diacetate (manufactured by Daicel Co., Ltd.: acetyl group total substitution degree DS = 2.4) and 25 parts by weight of glycerol triacetate as a plasticizer were blended in a dry state, and dried at 80° C. for 12 For more than one hour, stirring and mixing were further performed using a Henschel mixer to obtain a mixture of cellulose acetate and a plasticizer. The obtained mixture was supplied to a twin-screw extruder (PCM30 manufactured by Ikegai Co., Ltd., cylinder temperature: 200° C., die temperature: 220° C.), melt-kneaded, extruded, and pelletized to obtain a kneaded product.

[0202] 32 parts by weight of the obtained kneaded pellets and 68 parts by weight of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Co., Ltd.: melting point 190° C., degree of saponification 99.1%) as a water-soluble polymer were blended in a dry state, and then supplied to the A screw extrude...

Embodiment 2

[0236] Manufacture of cellulose acetate particles

[0237] Except that triacetin was changed to 22 parts by weight, a kneaded product was obtained in the same manner as in Example 1, the pellets of the obtained kneaded product were changed to 34 parts by weight, and polyvinyl alcohol was changed to 66 parts by weight , except that, a dispersion was formed in the same manner as in Example 1, and the obtained dispersion was combined with pure water so as to reach 5% by weight or less, and stirred at a temperature of 80° C. at a rotation speed of 200 rpm for 5 hours, except that Except that, cellulose acetate particles were obtained in the same manner as in Example 1.

[0238] Surface treatment of cellulose acetate particles

[0239] Surface-treated particles were obtained in the same manner as in Example 1 for the obtained cellulose acetate particles.

[0240] Measurement and evaluation of various physical properties were carried out in the same manner as in Example 1 for the ...

Embodiment 3

[0242] Manufacture of cellulose acetate particles

[0243] 80 parts by weight of thermoplastic starch (manufactured by Sanwa Starch Industry Co., Ltd.: gelatinized tapioca starch) was mixed with 20 parts by weight of glycerin to obtain 100 parts by weight instead of polyvinyl alcohol as a water-soluble polymer, and 68 parts by weight were used However, except that a dispersion was formed, cellulose acetate particles were obtained in the same manner as in Example 1.

[0244] Surface treatment of cellulose acetate particles

[0245] Surface-treated particles were obtained in the same manner as in Example 1 for the obtained cellulose acetate particles.

[0246] Measurement and evaluation of various physical properties were carried out in the same manner as in Example 1 for the obtained cellulose acetate particles and the particles obtained by surface-treating the cellulose acetate particles by the above-mentioned method. The results are shown in Table 1.

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Abstract

The purpose of the present invention is to provide microparticles that exhibit excellent biodegradability, tactile properties, and lipophilicity. Provided are cellulose acetate-containing particles having an average particle size of 80 nm to 100 mcirons, a sphericity of 0.7 to 1.0, a surface smoothness of 80% to 100%, and a surface contact angle versus water of at least 100 degrees. The cellulose acetate has a total degree of acetyl substitution of 0.7 to 2.9.

Description

technical field [0001] The present invention relates to cellulose acetate-containing particles, a cosmetic composition, and a method for producing cellulose acetate-containing particles. Background technique [0002] Conventionally, fine particles of various polymers according to applications have been proposed. For example, fine particles contained in cosmetics have various purposes. The purpose of containing microparticles in cosmetics is to improve the spreadability of cosmetics; to impart changes to the touch; to impart a wrinkle-reducing effect; and to improve the smoothness of foundations and the like. [0003] In particular, fine particles with a high degree of sphericity are excellent in tactile feeling, and can obtain a light scattering (soft focus) effect due to their physical properties and shape. In addition, when such microparticles are used in foundations, etc., the effect of filling unevenness of the skin to make it smooth, and scattering light in various di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12A61K8/73C08B3/06C08L1/12
CPCC08J3/12A61Q19/00C08L1/12C08L29/04A61K2800/412A61K8/0241A61K8/731A61K2800/624A61K2800/10C08J2301/12C08J2300/16C08J3/126C08J3/128C08K5/103C08B3/06C08K5/0016C08K5/11C08K5/09A61K8/0245A61K8/375A61K2800/48
Inventor 小林慧子大村雅也
Owner DAICEL CHEM IND LTD
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