Process for preparing aromatic polysulphones
US3948857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Jun 11, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of aromatic sulphone copolymers in which a polyaryl sulphone containing repeat units --Ar--SO.sub.2 -- (where Ar is a bivalent aromatic residue which may vary from unit to unit in the polymer chain and at least some of the Ar units have an aromatic ether or thioether group in the polymer chain ortho or para to at least one --SO.sub.2 -- group) is caused to react with an alkali metal salt of at least one halophenol or halothiophenol or with essentially equimolar quantities of an alkali metal salt of at least one dihydric phenol or thiophenol and at least one dihalobenzenoid compound, in which the halogen atoms are activated by an electron-attracting group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.