Patent ID: 8568867

Claim:
A solvent cast film, comprising: a thermoplastic polyimide comprising structural units derived from polymerization of a dianhydride component comprising a dianhydride selected from the group consisting of 3,4′-oxydiphthalic dianhydride, 3,3′-oxydiphthalic dianhydride, 4,4′-oxydiphthalic dianhydride, and a combination thereof, with a diamine component comprising 4,4′-diaminodiphenylsulfone and p-phenylene diamine and wherein the diamine component comprises greater than or equal to 10 mole % of 4,4′-diaminodiphenyl sulfone, based on the total moles of the diamine component; wherein the polyimide has a glass transition temperature from 190° C. to 400° C.; and wherein the film is solvent cast and has a coefficient of thermal expansion of less than 30 ppm/° C. as measured over 30 to 200° C., a thickness from 0.1 to 250 micrometers, and less than 5% residual solvent by weight.