METHOD OF PRODUCING FIBRES, THREADS, FILMS FROM HETEROCYCLIC AROMATIC POLYAMIDOIMIDES, CONTAINING BENZIMIDAZOLE FRAGMENTS, AND FABRIC BASED ON SAID THREADS Russian patent published in 2011 - IPC D01F6/00 D01F6/74 D01F6/90 C08G73/14 F41H1/02 C08J5/18 

FIELD: chemistry.

SUBSTANCE: method involves preparation of two solutions of a mixture of 5(6)-amino-2(para-aminophenyl)benzimidazole with 5(6)-amino-2(para-iminoquinone)benziimide in dimethylacetamide which contains lithium chloride, and then addition of paraphenylenediamine and an equimolar amount of terephthaloyl chloride to the first solution, and to the second solution - an equimolar amount of a dianhydride of pyromellitic acid. Said solutions are mixed at room temperature until formation of a spinning solution with dynamic viscosity of 300-600 P and concentratio of 3.5-4.0 wt %. The solution is filtered, vacuum treated and formed in a water-salt or water-alcohol settling bath, dried and thermally treated in free state. Industrial fireproof ballistic fabric is then produced from the obtained fibres. Threads obtained according to the invention have elementary fibre diametre higher than 10 mcm, rupture resistance not lower than 280 cN/tex and relative elongation of 3.8-4.5%.

EFFECT: invention enables to obtain fibres, threads, films with high elasticity while retaining good strength properties.

2 cl, 3 tbl, 4 ex