Production of aromatic polyethers
US4176222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1978 |
| Grant date | Nov 27, 1979 |
| Priority date | — |
| Expiry date | Jan 30, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/23
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Aromatic polyethers containing --SO.sub.2 -- and/or --CO-- groups are made by reacting (i) an equimolar mixture of a bisphenol and an aromatic dihalo compound or (ii) a halophenol, in which dihalo compound or halophenol the halogen atoms are activated by ortho or para --SO.sub.2 -- or --CO-- groups, with sodium carbonate or bicarbonate in admixture with a second alkali metal carbonate or bicarbonate the alkali metal of the second carbonate or bicarbonate being of higher atomic number than that of sodium. The amount of the second alkali metal carbonate or bicarbonate is such that there is 0.001 to 0.2 gram atom of the second alkali metal per gram atom of sodium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.