| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a porous polyimide film having a uniform pore size and a uniform distance between pores. SOLUTION: The method for manufacturing a polyimide porous film having a uniform pore size and a uniform distance between pores comprises casting polyimide precursor dope on a substrate, subsequently forming on the thus- obtained liquid film a protective layer comprising a solvent and a non-solvent, particularly a protective layer of a composition comprising 100 wt.% of the total of 30-70 wt.% of a non-solvent for the polyimide precursor and 70-30 wt.% of a polar solyent, followed by dipping in coagulation liquid to form a film-like precursor, and heating and drying the precursor to give a polyimide. |
