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. 12, 1991
Filed:
Oct. 31, 1989
Robert L Billmers, Stockton, NJ (US);
Daniel B Solarek, Bridgewater, NJ (US);
Ralph M Trksak, Manville, NJ (US);
National Starch and Chemical Investment Holding Corporation, Wilmington, DE (US);
Abstract
Polycationic polysaccharide derivatives containing more than one cationic substituent per substituted hydroxyl group are prepared by a site selective reaction of a cationic polysaccharide derivative with a suitable cationic reagent at a pH from 7.0 to 9.0. Suitable reagents include cationic alkyl, aryl, alkaryl, cycloaliphatic, or heterocyclic amines, and polymer thereof, which selectively react with a cationic substituent rather than a hydroxyl group of the cationic polysaccharide derivative. The polycationic polysaccharide derivatives prepared from these reagents are useful in the manufacture of paper.