FIELD: chemistry.
SUBSTANCE: yarn is made from a copolymer obtained from a mixture of monomers. The yarn contains 5-(6)-amino-2-(para-aminophenyl)benzimidazole, aromatic para-diamine and aromatic para-diacid, wherein the yarn is heated in at least two steps. At the first step, the yarn is heated at temperature 200-360°C with tension of at least 0.2 cN/dtex and at the second step, the yarn is heated at temperature 370-500°C with tension less than 1 cN/dtex. The multi-filament aramid yarn, which is spun from a sulphate spinning solution, has breaking strength of at least 250 mN/tex.
EFFECT: invention enables to produce high-strength aramid yarn.
11 cl, 7 tbl, 8 ex
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