Patent ID: 9393720
Filing Date: 2016-07-19
CPC Classification: B29C,B29K,C08G,C08J,C08L,H05K,Y10T

Claim Text:
1. A process for producing a polyimide film, comprising: flow-casting a solution of a polyamic acid or a polyimide, which is prepared by reacting a tetracarboxylic acid component comprising 3,3′,4,4′-biphenyltetracarboxylic dianhydride as the main component and a diamine component comprising p-phenylenediamine as the main component, on a support, and drying the solution to form a self-supporting film; heating the self-supporting film to provide a polyimide film; heating the resulting polyimide film at a temperature of 460° C. to 550° C.; and spraying pure water on a surface of the heat-treated polyimide film.