Terephthaloyl chloride → HCID 131731243, compound

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The present invention is related to a process which performs the polymerization of 5(6)-amino-2-(p-aminophenyl)benzimidazole, para-phenylenediamine and terephthaloyl dichloride at high solids (7 weight percent or greater) in NMP/CaCl2 or DMAC/CaCl2, isolates the copolymer crumb, dissolves the isolated copolymer crumb in concentrated sulfuric acid to form a liquid crystalline solution, and spins the solution into fibers. By “solids” it is meant the ratio of the mass of copolymer to the total mass of the solution, that is, the mass of the copolymer plus solvent.

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