METHOD OF PRODUCING POLYASPARTIC ACID BY MEANS OF PRECONDENSATE Russian patent published in 2019 - IPC C08G69/08 C08L77/04 C11D3/37 C11D3/60 

FIELD: chemistry.

SUBSTANCE: invention relates to embodiments of a method of producing polyaspartic acid. First version of the method of producing includes aspheric acid pre-condensation at temperature from 100 to 250 °C to degree of conversion from 2 to 40 %, optional cooling of precondensate, addition of 1–25 mol. % of acid catalyst in terms of amount of aspartic acid, precondensation of reaction mixture at temperature from 170 to 250 °C and hydrolysis of obtained polycondensates with addition of base. Second version of the method of producing includes contact of a mixture of aspartic acid and from 3 to 25 wt. % of polyaspartimide in terms of the amount of aspartic acid with water and from 1 to 25 mol. % of catalyst in the reactor, mixture polycondensation at temperature from 170 to 250 °C and hydrolysis of obtained polycondensates with addition of base.

EFFECT: obtaining polyaspartic acid by said methods enables to avoid formation of viscous and high-hard condensed phases during synthesis.

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