Method for purification of aromatic polyethers
US6630568B1 · kind B1 · utility
36Cited by
7References
79Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2001 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Mar 23, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/23
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aromatic polyethers are prepared by displacement polymerization reaction in the presence of a water-immiscible solvent with density ratio to water in a range of between about 0.9:1 and about 1.1:1 measured at a temperature in a range of between about 20° C. and about 25° C. The polyethers are purified by processes comprising aqueous extraction, or filtration, or a combination thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.