Cellulose oxidation by a perfluorinated hydrocarbon solution of nitrogen dioxide
US5180398A · kind A · utility
45Cited by
4References
10Claims
0Family size
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Key dates
| Filing date | Dec 20, 1990 |
| Grant date | Jan 19, 1993 |
| Priority date | — |
| Expiry date | Dec 20, 2010 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M11/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for oxidizing cellulose involves reacting the cellulose with a solution of nitrogen dioxide in a perfluorocarbon solvent. In preferred embodiments, the solvent has a boiling point in the range between about 30.degree. C. and 100.degree. C., the nitrogen dioxide concentration in the solution is in the range between about 2% and 12% by weight, and the reactants are maintained at a temperature between about 25.degree. C. and 60.degree. C. during a reaction time fo at least about 7 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.