Procedure for precipitating cellulose derivative
US4456749A · kind A · utility
12Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1983 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Aug 30, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B15/06
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention concerns a procedure for precipitating cellulose carbamate from an aqueous alkali solution. The solution is brought into contact with an aqueous solution of sulphuric acid containing one or several cations selected from the group consisting of Na, Al, Mg, Zn and Ca cations, whereby in the precipitation of cellulose carbamate the advantage is gained that the dry matter content of the fibre can be made high enough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.