POLYIMIDE PRECURSOR SOLUTION, POLYIMIDE POROUS FILM, AND THEIR PRODUCTION METHODS

摘要

PROBLEM TO BE SOLVED: To provide a polyimide precursor solution capable of producing a polyimide porous film or a coated product which is excellent in heat resistance and chemical resistance and has high porosity. SOLUTION: The polyimide precursor solution comprises a polyamide acid and a mixed solvent containing an amide type solvent and an ether type solvent, the ether type solvent having a boiling point at least 15°C higher than that of the amide type solvent. The production method of the polyimide precursor solution comprises reacting an acid component with an amine component in the amide type solvent and then adding an ether type solvent having a boiling point at least 15°C higher than that of the amide type solvent. COPYRIGHT: (C)2007,JPO&INPIT