Preparation of substituted polysulfones by metalation
US4833219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Sep 20, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L81/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process is provided for producing aromatic polysulfones which contain repeating units of the formula: ##STR1## wherein each R is ortho to the sulfone, at least one R per polymer chain is an aliphatic or aromatic substituent, a heteroatom or heteroatom-containing group or a metal or metal-containing group, with any remainder thereof being hydrogen, R.sub.1 and R.sub.2 each represents alkyl or aryl, each R.sub.s is hydrogen, and n is zero or one. The process comprises: PA0 (a) metalating (e.g. lithiating) a polysulfone, preferably dissolved in a solvent, containing repeating units of the formula: ##STR2## wherein R.sub.1, R.sub.2, R.sub.s and n are as defined above, so as to form a metalated (e.g. lithiated) polymer containing repeating units of the formula: ##STR3## wherein R.sub.1, R.sub.2, R.sub.s and n are as defined above, at least one M per polymer chain is metal l(e.g. lithium), with any remainder thereof being hydrogen; and PA0 (b) Quenching the metalated (e.g. lithiated) product with an electrophile so as to replace the metal (e.g. lithium) substitution by an aliphatic or aromatic substituent, a hetero atom or heteroatom-containing group, another metal or metal-containing …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.