US 2010/0076161 A1 · Manufacturing Method of Polyaspartic Acid Using Maleic Anhydride

Abstract

The present invention relates to a manufacturing method of polyaspartic acid. More particularly, the present invention relates to a manufacturing method of polyaspartic acid comprising steps of carrying out condensation polymerization of maleic anhydride and ammonia in the presence of a polar solvent without active hydrogen to give polysuccinimide and hydrolyzing the resulting polysuccinimide to obtain polyaspartic acid. Specifically, the present invention is characterized in that the quality of the synthetic product, polysuccinimide and polyaspartic acid, is improved by minimizing the decomposition and the degradation of the maleic acid during the process of the polymerization resulted from the introduction of substituent to maleic acid.

Claims11

Dependent claims

Manufacturing method of polyaspartic acid with high yield and minimal heat degradation comprising the steps of:

a) reacting maleic anhydride and an alcohol to give monoalkyl maleate compound;
b) reacting thus obtained monoalkyl maleate compound and ammonia gas or an aqueous solution of ammonia to give a reaction solution of alkyl ammonium salts;
c) adding a polar solvent without active hydrogen to thus obtained reaction solution of alkyl ammonium salts and heating the mixture to effect condensation polymerization for obtaining polysuccinimide;
and d) cooling and neutralizing the resulting polymer.

1 more element

Dependencies are inferred from the claim text.

Manufacturing Method of Polyaspartic Acid Using Maleic Anhydride

Life of this patent

Manufacturing Method of Polyaspartic Acid Using Maleic Anhydride

Life of this patent

Abstract

Claims11