Patent ID: 8858767
Filing Date: 2014-10-14
Classification: B82Y,C07D,C25B,G01N

Abstract:
1. A polyamic acid of formula (I): wherein each Z independently is in which each R independently is hydrogen, a phenyl group, or a C 1 to C 12 alkyl group; each bond a independently is at position 4 or 5; each bond b independently is at position 4′ or 5′; M is —S—, —O—, —CH R 5 being —SO 3 H, or a C 1 to C 12 alkyl group; m is 1 or 2, when m is 1, Y is  when m is 2, Y is X is O or S; each of R n is an integer ranging from 5 to 1000.