METHOD FOR PRODUCING AROMATIC COPOLYAMIDE AND FIBER COMPRISING AROMATIC COPOLYAMIDE OBTAINED BY THE METHOD

摘要: PROBLEM TO BE SOLVED: To provide an aromatic copolyamide having a reduced foreign substance content, from which fiber that ensures small rate of change in single yarn strength and exhibits excellent tensile can be obtained.SOLUTION: In method for producing including structural repeating units represented by chemical formula (1): -CO-Ar-CO-NH-Ar-NH- (2), diamine solution with turbidity ≤10 NTU containing diamines (3) (4): NH-Ar-NHis used. the (1), Arand Arare each independently unsubstituted or substituted divalent group. Aris (4),