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:
Aug. 25, 1992
Filed:
Jul. 05, 1991
Applicant:
Inventors:
Joachim Knebel, Darmstadt, DE;
Klaus Lehmann, Rossdorf, DE;
Assignee:
Rohm GmbH Chemische Fabrik, Darmstadt, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
548545 ; 548543 ; 548546 ;
Abstract
A method of manufacturing polysuccinimides with molecular weights in the range 100,000 to about 200,000 by polycondensation of aspartic acid, with phosphoric acids as condensation agents, in at least two process stages, at temperatures of 100.degree.-250.degree. C. and under reduced pressure, where in the second stage the mixture containing aspartic acid and phosphoric acid undergoes subsequent condensation following comminution.