Method of removing alkylene halogenohydrin from cellulose ether
US9156919B2 · kind B2 · utility
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4References
16Claims
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Key dates
| Filing date | Jul 17, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Jul 17, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L1/284
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a method of removing alkylene halogenohydrin from a cellulose ether the cellulose ether is provided, water is added to the cellulose ether and subsequently alkylene halogenohydrin and water is removed from the cellulose ether by evaporation. Alternatively steam or a steam mixture can be sparged across or through the cellulose ether to remove halogenohydrin from the cellulose ether.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.