Patent ID: 9193836
Filing Date: 2015-11-24
Classification: C08G,C08J,Y10T

Abstract:
1. A process of producing fine particles of polyamide-imide resin comprising: a dissolution step (b1) and a precipitation step (b2) wherein (b1) polyamide-imide resin is dissolved in an organic solvent to prepare a polyamide-imide resin solution B1 having a polyamide-imide resin content of not less than 3 mass % and less than 10 mass %, and (b2) the polyamide-imide resin solution B1 is subjected to flash crystallization with a solvent that is virtually free from surface active agents and able to precipitate fine particles of the polyamide-imide resin to cause precipitation of fine particles of the polyamide-imide resin, such that the fine particles have an average primary particles diameter of 300 nm or less, wherein the solvent used to precipitate the polyamide-imide resin particles of step (b2) accounts for 0.3 to 100 parts by mass per 1 part by mass of the solvent used to prepare the polyamide-imide resin solution in step (b1).