METHOD FOR MANUFACTURING POROUS POLYIMIDE FILM AND FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a film having a porous layer in the central part thereof and dense layers on the both surfaces in a simple operation. SOLUTION: The method for manufacturing a porous polyimide film having dense layers on the both surfaces thereof and the central part comprising a porous layer comprises imidization by a heat treatment of a film-like composition (C) comprising a homogeneous solution (A) of a polyimide precursor and a poor solvent of the polyimide precursor, the poor solvent (B) having a boiling point or a thermal decomposition temperature higher than or equal to the imidization initiation temperature of the polyimide precursor.