FIELD: chemistry.
SUBSTANCE: present invention concerns yarns comprising copolymer derived from copolymerisation of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride, where ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to moles of para-phenylenediamine is 30/70 to 85/15; yarn having a sulphur content greater than 0.1 %; and hydrolytic strength retention of yarn is greater than 60 %.
EFFECT: invention discloses a yarn, containing copolymer, as well as methods of producing such types of yarn.
21 cl, 2 tbl, 2 dwg
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