Purification of cellulose ethers
US4581446A · kind A · utility
4Cited by
5References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1985 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Mar 15, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B11/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Impurities in cellulose ether compositions are removed by providing a functionally effective thickness of a cellulose ether composition to a filtration device, and contacting the thickness, in a manner such that substantial thickness is maintained with at least one extracting solution in which the impurities in the cellulose ether are soluble such that a gradient impurity concentration is formed. High purity cellulose ethers are prepared, without experiencing large product losses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.