| 摘要 |
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. |
