METHOD OF PRODUCING POLYAMIDE ACIDS WITH GIVEN DEGREE OF POLYMERISATION FROM HIGHLY ACTIVE MONOMERS Russian patent published in 2015 - IPC C08G73/10 C08L79/08 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing polyamide acids with a given degree of polymerisation via polycondensation of highly active monomers, which includes mixing a diamine solution with a solid dianhydride of a tetracarboxylic acid and a monofunctional compound. Synthesis is carried out in three steps: polycondensation of the diamine with the dianhydride of tetracarboxylic acid, taken in amount of 0.84-0.98 mol per mol diamine, condensation with the monofunctional compound which is a phthalic acid anhydride, and then polycondensation with the dianhydride of tetracarboxylic acid.

EFFECT: obtaining polyamide acids with a given degree of polymerisation using highly active monomers.

4 cl, 2 ex