PROCESS FOR PRODUCING COPOLYMER FILMS

摘要

A process for producing polyamide-polyimide block copolymer films or polyamide-polyimide copolymer films having excellent thermal resistance and mechanical strength, which comprises casting a solvent solution of a polyamide-polyamide acid block copolymer or a polyamide-polyamide acid copolymer on a substrate, converting the deposited thin layer of the solution into a self-supporting film, regulating the residual solvent content of the film by heating or other means, if necessary, and then heating the film at a temperature of 320.degree. to 500.degree.C for a specified period of time.