Patent ID: 8907051
Filing Date: 2014-12-09
Classification: C08G,C08K

Abstract:
1. A process for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: a) forming a solution of oligomers having amine end groups from two moles of DAPBI and one mole of terephthaloyl dichloride in a solvent system comprising an organic solvent and an inorganic salt; b) adding PPD to the solution of oligomers; and c) adding additional terephthaloyl dichloride to form a polymer; wherein the amount of the solution that is DAPBI in step (a) is in the range of from 1 to 10 weight %.