NEUTRALISED COPOLYMER CRUMB AND METHODS OF PRODUCTION THEREOF Russian patent published in 2016 - IPC C08G69/32 C08L77/10 D01F6/60 

FIELD: technological processes.

SUBSTANCE: invention relates to copolymer crumb, to production of neutralised copolymer chips, to method of making aramid yarn and yarn. Method for production of neutralised copolymer crumb consists in the fact that at first is obtained copolymer crumb copolymerisation of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole and terephthaloyldichloride. Obtained copolymer crumb comprises by-product or admixture in the form of acid. Then copolymer crumb reacts with a base to form a salt of said acid. Reaction is carried out during the period of time sufficient to ensure production of a polymer, having content of titratable acid less than 0.4 mol/kg. Then, at least part of said salt is removed to form particles of neutralised copolymer, having characteristic viscosity not less than 3 dl/g. Method of forming aramid yarn consists in the fact that a copolymer crumb is dissolved in sulphuric acid. Obtained spin solution is spun through a draw plate to obtain one or several elementary threads.

EFFECT: invention significantly reduces formation of bubbles and prevents the odor of HCl from occurring in spinning solution, as well as enhances the quality of yarn.

19 cl, 1 dwg, 1 tbl, 2 ex