Patent ID: 8404795

Claim:
A monomer of the formula wherein G 1 is selected from an alkylene, a fluoroalkylene, an arene, a fluoroarene, a benzyl, a fluorobenzyl, a diaryl ether and a diaryl; G 2 is an imide of empirical formula C 4-20 H 3-12 N 1-2 O 2-5 of which C 2 O 2 N is shown in the formula above; G 3a and G 3b are 5- or 6-membered monocyclic or bicyclic imides of which the imide portion, C 2 O 2 N, is shown in the formula above; A is a linker of empirical formula C 0-12 H 0-8 F 0-8 N 0-2 O 0-2 or joining rings G 3a and G 3b ; R 1 and R 2 are chosen independently from —OH, —NH 2 , —Cl, —Br, —SO 2 Cl, —N═C═O and —COCl; R 1a is chosen from —OH, —NH 2 , —Cl, —Br, —N═C═O and —COCl; and R 2a is chosen from —NH 2 , —Cl, —Br, —SO 2 Cl, —N═C═O and —COCl.