Patent ID: 8545975

Claim:
An article comprising a solvent cast film, the 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 combinations thereof, with a diamine component comprising 4,4′-diaminodiphenylsulfone and p-phenylene diamine; wherein the polyimide has a glass transition temperature from 190° C. to 400° C.; and wherein the film has a coefficient of thermal expansion of less than 30 ppm/° C. measured over 30° C. to 200° C., a thickness from 0.1 to 250 micrometers, and less than 5% residual solvent by weight; and wherein the film further comprises a nanoclay and has a lower CTE (measured over 30° C. to 200° C.) than a film of the same composition without the nanoclay.