A solvent resistant copolyimide

A solvent resistant copolyimide was prepared by reacting 4,4'-oxydiphthalic anhydride with a diamine blend comprising, based on the total amount of the diamine blend, about 75 to 90 mole percent of 3,4'-oxydianiline and about 10 to 25 mole percent p-phenylene diamine. The solvent resistant copolyimide had a higher glass transition temperature when cured at 350 C, 371 C and 400 C than LaRC(TM)-IA. The composite prepared from the copolyimide had similar mechanical properties to LaRC(TM)-IA. Films prepared from the copolyimide were resistant to immediate breakage when exposed to solvents such as dimethylacetamide and chloroform. The adhesive properties of the copolyimide were maintained even after testing at 23 C, 150 C, 177 C and 204 C.