FIELD: organic chemistry, chemical technology. SUBSTANCE: invention describes method for preparing poly-para-phenylene terephthalamide and its copolymers by method of low-temperature polycondensation of para-phenylenediamine or its dihydrochloride or their mixture with other aromatic diamines in amide-saline solvent with terephthalic acid dichloroanhydride carrying out in reactor of batch-operating type with anchor-impeller or gate- impeller mixer. Synthesis is carried out in filling coefficient 85% and mixer rate 1.5-2.5 s-1; mixer diameter is 92-98% of internal diameter of reactor. Method provides carrying out synthesis of poly-para-phenylene terephthalamide and its copolymers in reactor of different capacity without additional consumptions and to simplify drive of their mixers. EFFECT: improved preparing method. 2 cl, 4 ex
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