Aromatic polysulfone compounds and their manufacture
US4999415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1988 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Dec 7, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to aromatic polysulfone compounds and their manufacture. More particularly, this invention relates to functional group containing aromatic polysulfones, and their manufacture by metalation with organo-lithium compounds, of halogenated (e.g. brominated or chloromethylated) aromatic polysulfone compounds. The degree of halogenation of the starting material determines the sites that may be metalated, and the degree of metalation determines how many of these sites will be metalated. At least one of the metalated sites may be treated with an electrophile so that the lithium at that site is replaced by a residuum of the electrophile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.