Process for activating polysaccharides, polysaccharides produced by this process, and use thereof
US5939544A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Nov 6, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F2/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The process for activating polysaccharides consists of contacting the polysaccharide with liquid ammonia at an initial pressure which is higher than atmospheric pressure and at a temperature of at least approximately 25.degree. C., the amount of liquid ammonia being sufficient at least for wetting the surface of the polysaccharide starting material which is then expanded. The volume available for the polysaccharide/liquid ammonia system is enlarged in the manner of an explosion by lowering the pressure by at least 5 bar. The process is particularly suitable for activating cellulose, guar gum, starch and chitin. The process enables cellulose to be modified in a novel manner. The activated polysaccharides display higher reactivity and improved elimination of reagents during acylation, alkylation, silylation, xanthogenation and carbomoylation with largely homogeneous reaction processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.