Patent ID: 6958192
Filing Date: 2005-10-25
Classification: C08G,Y10T

Abstract:
1. A polyimide film prepared from reacting 2,3,3′,4-biphenyltetracarboxylic dianhydride with an aromatic diamine selected from the group consisting of: wherein X is selected from the group consisting of: wherein R is phenyl and CH 3 , wherein Y is selected from the group consisting of CH 3 , phenyl, chloro and bromo; wherein R 1 is CF 3 and R 2 is H, and wherein R 1 is H and R 2 is CF 3 ; and further wherein the polyimide film has the following combination of properties: a thickness of from about 0.02 mm to about 0.06 mm; light transmission at 500 nm of greater than about 60%; thermal emissivity of greater than about 0.46; solar absorptivity of less than about 0.16; and tensile strength greater than about 93.8 MPa.