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.
Type:
Grant
Filed:
April 17, 2007
Date of Patent:
May 20, 2014
Assignee:
Aekyung Petrochemical Co., Ltd.
Inventors:
Jeong Gon Kim, Jong Hwa Lee, Sung Duck Seo, Yeong Im Yu
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.
Type:
Application
Filed:
April 17, 2007
Publication date:
March 25, 2010
Applicant:
AEKYUNG PETROCHEMICAL CO., LTD.
Inventors:
Jeong Gon Kim, Jong Hwa Lee, Sung Duck Seo, Yeong Im Yu