Patent ID: 9161440
Filing Date: 2015-10-13
Classification: B32B,C08G,C08J,C08K,C08L,H05K,Y10T

Abstract:
1. An article comprising a solvent cast film, the film comprising a thermoplastic polyimide consisting essentially of structural units derived from polymerization of wherein the dianhydride component and the diamine component are in a molar ratio of from 1 to 1.3 moles diamine per mole of dianhydride; wherein the polyimide has a glass transition temperature of 190° C. or greater; 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; wherein the polyimide has less than 15 molar % of structural units derived from a member of the group consisting of biphenyltetracarboxylic acid, a dianhydride of biphenyltetracarboxylic acid, an ester of biphenyltetracarboxylic acid, and a combination thereof; and wherein the film further comprises an exfoliated nanoclay and has a lower CTE (measured over 30° C. to 200° C.) than a film of the same composition without the exfoliated nanoclay.