FIELD: chemistry.
SUBSTANCE: there is disclosed method for producing polyamide acid solution by polycondensation of mixed 4,4'-diaminotriphenylamine and aromatic diamines and 3,3',4,4'- benzophenontetracarboxylic acid dianhydride or aromatic tetracarboxylic acid dianhydrides in amide solvent with agitating. One aromatic diamine mixed with 4,4'-diaminotriphenylamine is 5(6)-amino-2-(4-aminophenyl)benzimidazole with polycondensation in total molar ratio of aromatic diamines to aromatic tetracarboxylic acid dianhydrides equal to 1.00: (≤1.00).
EFFECT: prevented polymer gelatination in producing bulk polyamide acid solution, possibility for industrial engineering, possibility for more concentrated polymer solutions available for coatings, films and fibres.
5 cl, 6 ex, 1 tbl
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