The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2014
Filed:
Apr. 17, 2007
Jeong Gon Kim, Daejeon, KR;
Jong Hwa Lee, Daejeon, KR;
Sung Duck Seo, Daejeon, KR;
Yeong Im Yu, Daejeon, KR;
Jeong Gon Kim, Daejeon, KR;
Jong Hwa Lee, Daejeon, KR;
Sung Duck Seo, Daejeon, KR;
Yeong Im Yu, Daejeon, KR;
Aekyung Petrochemical Co., Ltd., Seoul, KR;
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.