Powdered oxidized cellulose
US6627749B1 · kind B1 · utility
188Cited by
7References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 2000 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Nov 9, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B15/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A controlled chemical method to produce oxidized cellulose in high yields (75-95%) and different levels of oxidation (carboxyl content <25.6%, w/w), suitable for use as an immobilizing matrix or carrier for drugs, chemicals, and biological macromolecules, has been developed by reacting a cellulose material with a mixture of phosphoric acid and nitric acid and a small but adequate amounts of sodium nitrite at room temperature for a period until the desired oxidation level is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.