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:
Feb. 02, 1993
Filed:
Oct. 25, 1991
Applicant:
Inventors:
Klaus Heidel, Marl, DE;
Sigrid Scholz-Weigl, Marl, DE;
Assignee:
Starchem GmbH, Krefeld, DE;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; A61F / ; A61L / ;
U.S. Cl.
CPC ...
527300 ; 527312 ; 527313 ; 527314 ; 527315 ;
Abstract
Polysaccharide graft polymers are prepared by semi-continuous reverse-phase suspension polymerization, partial dewatering and crosslinking, wherein during and after the suspension polymerization, in which an aqueous solution of an at least partially neutralized, olefinically unsaturated carboxylic acid is added to a suspension of a polysaccharide in a nonpolar organic solvent, the viscosity is reduced by adding amphoteric ammonium compounds or quaternary imidazolinium salts to the reaction medium.