METHOD OF PRODUCING AROMATIC COPOLYAMIDES (VERSIONS) AND HIGH-STRENGTH HIGH-MODULUS FIBRES BASED THEREON Russian patent published in 2012 - IPC C08G69/32 D01F6/80 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing aromatic copolyamides via low-temperature polycondensation of a mixture of aromatic diamines: 5(6)amino-2-(para-aminophenyl)benzimidazole and one or more diamines of formula (2) (as a version - together with a diamine of formula (1)) with haloanhydrides of aromatic diacids of formula (3) in the medium of an amide solvent with a salt additive. Also disclosed is wet or dry-and-wet moulding of fibres from the disclosed polycondensation solutions. NH₂-Ar₁-NH₂ (1), NH₂-Ar₂-NH₂ (2), ClOC-Ar₁-COCl (3) Ar₁ and Ar₂ are divalent para-aromatic radicals: Ar₁= , where X=H, Alk, AlkO, Hal, wherein Alk, AlkO are lower C₁-C₄ alkyl radicals; Hal is mainly Cl; Ar₂ is a complex aromatic group and (or) , where X=X₁=Cl; X=Cl, X₁=H. The obtained fibres have linear density in the range of 25-65 tex, strength of 200 cN/tex or higher, tangent modulus of elasticity of 140 GPa or higher and elongation of 1.5% or higher.

EFFECT: high linear density, strength and tangent modulus of elasticity of the fibres.

5 cl, 1 tbl, 15 ex