Process for producing polyimide fiber

摘要

PCT No. PCT/RU94/00266 Sec. 371 Date Jul. 9, 1996 Sec. 102(e) Date Jul. 9, 1996 PCT Filed Nov. 30, 1994 PCT Pub. No. WO96/04414 PCT Pub. Date Feb. 15, 1996A process for the production of polyimide fibers includes having the fiber spun from a fully aromatic polyamide acid solution in an aprotic amide solvent in an aqueous-organic bath and subjected to plasticization drafting. It is washed until a 2-4 wt. % content of the organic solvent per fiber is attained and treated with organic or inorganic acids until a 0.5-1.0 wt. % content thereof per fiber is attained. Thereafter, fibers are dried and heat-treated.