LARGE-TONNAGE PROCESS FOR POLYMERISING POLYARAMIDE CONTAINING 5(6)-AMINO-2-(p-AMINOPHENYL)BENZIMIDAZOLE (DAPBI) Russian patent published in 2013 - IPC C08G69/32 C08G69/28 C08K3/16 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing a composition in form of crumbs, containing an aromatic polyamide from an aromatic diamine and an acyl chloride of an aromatic dicarboxylic acid. Disclosed is a method of producing crumbs of an aromatic polyamide from an aromatic diamine and an acyl chloride of an aromatic dicarboxylic acid, where the aromatic polyamide includes elementary units of 5(6)-amino-2-(p-aminophenyl)benzimidazole-terephthalamide and has relative viscosity η_rel of at least 3, by adding monomers (i)-(iii) to N-methylpyrrolidone as a solvent, where: (i) is paraphenylenediamine (PPD) with concentration of 0-30 mol %; (ii) is 5(6)-amino-2-(p-aminophenyl)benzimidazole (DABPI) with concentration of 20-50 mol %; (iii) is terephthaloyl dichloride (TDC) with concentration of 49.05-50.05 mol %; and optionally calcium chloride to obtain molar ratio CaCl₂/aromatic diamine less than 0.5, and ratio aromatic diamine/acyl chloride of aromatic dicarboxylic acid from 0.99 to 1.01; mixing monomers and optionally calcium chloride into a homogeneous mixture having monomer concentration from 5 to 12 wt %, and then adding calcium chloride to the homogeneous mixture to obtain molar ratio CaCl₂/aromatic diamine of 0.6-1.0; and polymerising the mixture.

EFFECT: obtaining a polyamide in form of crumbs in a large-tonnage industrial process.

7 cl, 1 tbl, 4 ex