Method of producing alkali-soluble cellulose derivative
US4404369A · kind A · utility
26Cited by
9References
8Claims
0Family size
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Key dates
| Filing date | Jan 20, 1982 |
| Grant date | Sep 13, 1983 |
| Priority date | — |
| Expiry date | Jan 20, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B15/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An alkali-soluble cellulose derivative is produced by treating cellulose with liquid ammonia having urea dissolved therein, removing the ammonia, resulting in cellulose having urea distributed therethrough, and heating the thus obtained cellulose-urea to cause reaction between the urea and cellulose and form alkali-soluble cellulose carbamate. This cellulose carbamate can be precipitated from alkaline solution in the form of cellulose carbamate film or fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.