| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyimide porous film or a coating having excellent heat resistance, excellent chemical resistance and a high porosity.SOLUTION: This invention provides a polyimide porous film in which a solvent mixture of an amide solvent and an ether solvent whose mutual boiling points are in a specific relationship is used for a solvent of a polyimide precursor, so that the film is made porous upon imidization under heat, and the film has a density of 0.10-0.60 g/cmand a maximum pore diameter of not more than 1 mm and also includes a compact layer on the surface. |
