Preparation of water-soluble acylated chitosan
US4996307A · kind A · utility
25Cited by
1References
18Claims
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Key dates
| Filing date | Jun 25, 1986 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Jun 25, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B37/003
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A water-soluble acylated chitosan having a degree of acylation of 35 to 65% is prepared by dissolving a water-insoluble chitosan in the form of a random copolymer having a degree of deacetylation of at least 70% in an aqueous acid solution, diluting the solution with water or a water-miscible solvent such as methanol, and adding an acylation agent such as acetic anhydride to the diluted solution. The acylated chitosan is obtained in high yields within a few hours at about room temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.