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Title:
PIGMENT-CONTAINING ALIPHATIC POLYESTER FINE PARTICLES, PRODUCTION METHOD THEREFOR, AND COSMETIC ARTICLE
Document Type and Number:
WIPO Patent Application WO/2019/167749
Kind Code:
A1
Abstract:
Provided are novel pigment-containing aliphatic polyester resin fine particles obtained by: forming an emulsion in a system for causing phase separation in a polymer solution obtained by mixing an aliphatic polyester resin (A) selected from the group consisting of aliphatic polyesters obtained from aliphatic hydroxycarboxylic acids, aliphatic polyesters obtained from aliphatic diols and aliphatic dicarboxylic acids and/or ester-forming derivatives thereof, and aliphatic polyesters obtained from lactones, a resin (B) which is different from the aliphatic polyester resin and induces phase separation, a pigment (C), and an organic solvent (D), to obtain two phases, i.e., a solution phase containing the aliphatic polyester resin (A) as a main component and the pigment, and a solution phase containing the resin (B) as a main component; and bringing the emulsion into contact with a poor solvent (E) for the aliphatic polyester resin (A) to cause precipitation of aliphatic polyester resin fine particles containing the pigment (C), wherein the contained amount of the pigment (C) is 1.5-40 mass, and the average particle size is not less than 1 μm but less than 100 μm. The present invention provides novel polymer fine particles that serve as a colorant having high color developability and that improve the handleability such as fluidity and dispersibility of a pigment, and, when used as a cosmetic additive, facilitate removal of a cosmetic, and are less likely to cause color transfer to the skin.

Inventors:
IMAZU, Naoki (Toray Industries Inc., 9-1, Oe-cho, Minato-ku, Nagoya-sh, Aichi 02, 〒4558502, JP)
ISAGO, Yuka (Toray Industries Inc., 9-1, Oe-cho, Minato-ku, Nagoya-sh, Aichi 02, 〒4558502, JP)
IWATA, Hirokazu (Toray Industries Inc., 9-1, Oe-cho, Minato-ku, Nagoya-sh, Aichi 02, 〒4558502, JP)
TAKEZAKI, Hiroshi (Toray Industries Inc., 9-1, Oe-cho, Minato-ku, Nagoya-sh, Aichi 02, 〒4558502, JP)
MIYAMA, Hisashi (Toray Industries Inc., 1-1, Nihonbashi-Muromachi 2-chome, Chuo-k, Tokyo 66, 〒1038666, JP)
Application Number:
JP2019/006295
Publication Date:
September 06, 2019
Filing Date:
February 20, 2019
Export Citation:
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Assignee:
TORAY INDUSTRIES, INC. (1-1 Nihonbashi-Muromachi 2-chome, Chuo-ku Tokyo, 66, 〒1038666, JP)
International Classes:
C08L67/04; A61K8/85; A61Q1/02; C08J3/14; C08J3/215; C08K5/00; C08L101/00; C09B29/15; C09B67/20
Domestic Patent References:
WO2012105140A12012-08-09
Foreign References:
JP2013076040A2013-04-25
JP2005179646A2005-07-07
JP2017155218A2017-09-07
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