Patent ID: 8907052
Filing Date: 2014-12-09
Classification: C08G,C08K,C08L

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 slurry of DAPBI in a solvent system comprising an organic solvent and an inorganic salt; b) adding less than a stoichiometric amount, relative to the amount of DAPBI, of terephthaloyl dichloride to the slurry; c) agitating the slurry to react the DAPBI and terephthaloyl dichloride to form an oligomeric solution; d) adding PPD to the oligomeric solution and agitating until essentially all of the PPD is dissolved, followed by the addition of terephthaloyl dichloride to form a prepolymer solution; and e) allowing the prepolymer solution to form a polymer, wherein the amount of the slurry that is DAPBI in step (a) is in the range of from 0.5 to 10 weight %.