Catalyst removal from polyphenylene ether reaction solutions by aqueous extraction with ammonium salts
US3984374A · kind A · utility
5Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1975 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Apr 1, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel process for the separation of catalyst residues from polyphenylene ether reaction systems is disclosed. The process is based on the discovery that an aqueous solution of an ammonium salt will extract copper from a reaction solution of a polyphenylene ether resin and a complex copper-amine catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.