Preparation of polycationic polysaccharides by site selective reaction
US4992536A · kind A · utility
11Cited by
5References
8Claims
0Family size
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Key dates
| Filing date | Oct 31, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Oct 31, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/29
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.