Copolyimide ODPA/BPDA/4,4'-ODA/p-PDA.

摘要

Polyimide copolymers of the following formulas are disclosed: The first is a copolyimide of the recurring structure wherein AR may be either AR1 or AR2, wherein AR1 is represented by the following formula: and wherein AR2 is represented by the following formula: provided that the molar ratio between AR1 and AR2 is in the range from 3:1 to 1:3 and wherein AR3 is selected from the group consisting of The second is a block copolyimide in which the following two recurring structures exist as blocks wherein block 1 is where AR1 is and wherein block 2 is where AR2 is provided that the molar ratio of block 1 to block 2 is in the range of 3:1 to 1:3 and wherein AR3 is selected from the group consisting of These polyimides have unexpected properties which are useful in various electronic applications.