PRODUCTION OF AND DRYING OF COPOLYMER FIBERS

摘要

The present invention concerns processes for reducing water in never-dried fiber comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6) - amino- 2 - (p-aminophenyl) benzimidazole, and terephthaloyl dichloride; the process comprising the steps of: (a) heating the never-dried fiber to a temperature of at least 20 °C but less than 100°C until the moisture content of the fiber is 20 weight percent or less of the fiber; and (b) further heating the fiber to a temperature of at least 350 °C.