| abstract |
An object of the present invention is to provide a polyimide porous membrane having excellent heat resistance and chemical resistance, and particularly high air permeability, and a method for producing the same. A polyimide precursor comprising a repeating unit represented by the general formula (1), a good solvent for the polyimide precursor, and a non-solvent for the polyimide precursor having a boiling point of 30 ° C. or higher than the good solvent for the polyimide precursor. And a polyimide precursor solution containing at least a polyimide precursor solution that is heated and dried in the presence of vapor and / or mist of a polyimide precursor non-solvent. [B is a tetravalent unit containing an aromatic ring; A is a divalent unit containing an aromatic ring] [Selection] None |