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1. (WO2014192607) ETHYLENE-VINYL ALCOHOL COPOLYMER MICROPARTICLES, DISPERSION LIQUID AND RESIN COMPOSITION INCLUDING SAME, AND METHOD FOR PRODUCING SAID MICROPARTICLES

Pub. No.:    WO/2014/192607    International Application No.:    PCT/JP2014/063414
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Thu May 22 01:59:59 CEST 2014
IPC: C08J 3/16
Applicants: TORAY INDUSTRIES, INC.
東レ株式会社
Inventors: OTSUBO Takahiko
大坪孝彦
ASANO Itaru
浅野到
TAKEZAKI Hiroshi
竹崎宏
Title: ETHYLENE-VINYL ALCOHOL COPOLYMER MICROPARTICLES, DISPERSION LIQUID AND RESIN COMPOSITION INCLUDING SAME, AND METHOD FOR PRODUCING SAID MICROPARTICLES
Abstract:
By first forming an emulsion in a system that separates into two phases which include a solution phase including an ethylene-vinyl alcohol copolymer (A) as the main component and a solution phase including a polymer (B) different from said ethylene-vinyl alcohol copolymer (A) as the main component when said copolymer (A), said polymer (B), and an organic solvent (C) having an SP value of from 20 (J/cm3)1/2 to 30 (J/cm3)1/2 inclusive are dissolved and mixed together, and then causing said ethylene-vinyl alcohol copolymer (A) to precipitate as microparticles by bringing a poor solvent (D) of said ethylene-vinyl alcohol copolymer (A) into contact with said emulsion, it is possible to obtain ethylene-vinyl alcohol copolymer microparticles that have a narrow particle size distribution wherein the particle size distribution index in a dry powder state is 2 or less, have a spherical particle shape, and exhibit excellent re-dispersibility into liquid.