PROCESS FOR PREPARING POLY-N-PHENYLENE TEREPHTHALAMIDE AND COPOLYMERS THERCOF Russian patent published in 1996 - IPC

FIELD: preparation of polyamide. SUBSTANCE: p-phenylenediamine (p-PHDA) is polycondensated with terephthalic acid dichloride or mixtures thereof with other aromatic diamines and aromatic dicarboxylic acid dichlorides in amide-salt solvent solution in the presence of tertiary amine added to the reaction mixture after feeding the starting monomer. p-PHDA is used simultaneously as base of p-PHDA and hydrochloric salt thereof in molar ratio of 1.0 to 1.25 respectively. The process is carried out at temperature ranging from 0 to 10 C , and tertiary amine is added in amount of from 0.4 to 0.6 mole per 1 mole of the evolved hydrogen chloride. EFFECT: more efficient preparation process. 1 tbl