Patent ID: 8716432
Filing Date: 2014-05-06
Classification: C08G

Abstract:
1. A process for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino benzimidazole (DAPBI), 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 terephthaloyl dichloride to the slurry in an amount of up to one-half mole for every mole of DAPBI in 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 substantially all of the PPD is dissolved, e) adding terephthaloyl dichloride in an amount of greater than one mole for every mole of PPD in the solution to form a prepolymer solution; and e) agitating the prepolymer solution to form a polymer.