Process for the preparation of aromatic polyethers with mixture of carbonate catalysts
US4636557A · kind A · utility
13Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1984 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Nov 21, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/4012
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of aromatic polyethers by condensation of the reactants in the presence of a condensation agent consisting of a mixture of metal carbonates comprising (a) lithium and/or an alkaline earth metal carbonate and (b) sodium, potassium, rubidium and/or cesium carbonate. The combination of carbonates (a) and (b) according to the invention leads to a surprising increase in activity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.