Patent ID: 8921512
Filing Date: 2014-12-30
Classification: C08G

Abstract:
1. A process for forming a polymer crumb comprising residues of 2-(4-amino phenyl)-5(6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: a) forming a slurry of b mole percent DAPBI and y mole percent PPD in a solvent system comprising organic solvent and c weight percent of an inorganic salt, wherein the inorganic salt is present in an amount of at least 5 weight percent of the organic solvent, DAPBI and PPD being present in an amount sufficient for providing a polymer solution having a weight percent solids of 12 percent or greater on a polymer basis; and b) contacting the slurry of step a) with a stoichiometric amount of terephthaloyl dichloride to form a product comprising said polymer wherein the sum of y+b is 100 and the product of b×c is 225 or greater; wherein the weight percent solids in the product is 14-25% on a monomer basis.