| abstract |
Provided are: a polyimide copolymer oligomer that satisfies a high level of solvent solubility, storage stability, and heat resistance, and that is the precursor material for a polyimide copolymer having superior utility; a polyimide copolymer obtained therefrom; and a method for producing each of same. The present invention results from the co-polymerization of (A) 3,3',4,4'-biphenyltetracarboxylic acid dianhydride and/or 3,3',4,4'-diphenylsulfonetetracarboxylic acid dianhydride and (B) at least one diamine and/or diisocyanate represented by general formulae (1) to (3) (in the formulae: X is an amino group or an isocyanate group; R 1 -R 8 each independently represent a hydrogen atom, an alkyl group having 1-4 carbon atoms, an alkenyl group having 2-4 carbon atoms, or an alkoxy group having 1-4 carbon atoms; and at least one of R 1 -R 8 is not a hydrogen atom). |