Patent ID: 8093348

Claim:
Thermoplastic polyimides derived from asymmetric dianhydrides or the ester-acid derivatives thereof selected from the group comprising of: and approximate stoichiometric amount of at least one multifunctional amine to form thermoplastic polyimides having a formula selected from the group consisting of: wherein Z is C(CF 3 ) 2 , which correspond to the following polyimide structures consisting of: wherein B is a second dianhydride or its ester acid derivative other than (a) and (b), consisting of: R is a lower alkyl radical having 1 to 6 carbon, A is a divalent organic radical of a diamine (H 2 N-A-NH 2 ), (BA) m is the reaction product of dianhydride B or its ester acid derivative with a diamine (H 2 N-A-NH 2 ), n has the value of 1-100, and m has the value of 1-100.