Polyimide precursor solution and method for producing porous polyimide film

Abstract

A polyimide precursor solution includes: a polyimide precursor; a resin particle having 55% by weight or more of a structural unit derived from a styrene derivative; and a mixed solvent containing a first organic solvent (S1) and a second organic solvent (S2), wherein the polyimide precursor solution satisfies the following conditions (1) to (4), condition (1): a weight ratio (S1/S2) of the first organic solvent (S1) to the second organic solvent (S2) is from 50/50 to 90/10, condition (2): a HSP distance between the first organic solvent (S1) and the resin particle is 11 or more and less than 16, condition (3): a HSP distance between the second organic solvent (S2) and the resin particle is 16 or more, and condition (4): a HSP distance between the mixed solvent and the polyimide precursor is 12 or less.

Dependencies are inferred from the claim text.