Patent ID: 7348064
Filing Date: 2008-03-25
Classification: B32B,C08G,H05K,Y10S,Y10T

Abstract:
1. A multi-layer polyimide composite comprising: A. a first outer layer comprising a polyimide adhesive composition the polyimide adhesive composition comprising a polyimide base polymer synthesized by contacting an aromatic dianhydride with a diamine component, the diamine component comprising 50 to 90 mole % aliphatic diamine; and 10 to 50 mole % aromatic diamine, wherein: a. the aliphatic diamine is hexamethylene diamine (HMD), b. the aromatic diamine is 1,3-bis-(4-aminophenoxy) benzene, c. the aromatic dianhydride is a combination of 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA) and 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA), d. the z-axis coefficient of thermal expansion of the polyimide base polymer, as determined by ASTM Method IPC-650 2.4.41, is between and including 80 and 150 ppm/° C., and e. the polyimide base polymer has a glass transition temperature from 150 to 200° C., and B. an inner layer, wherein the inner layer is a polyimide with a glass transition temperature greater than 250° C.