Catalyst removal from polyphenylene ether reaction solutions by bisulfate extraction
US3994859A · kind A · utility
3Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1975 |
| Grant date | Nov 30, 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 a water soluble bisulfate will extract a complex copper-amine catalyst from a reaction solution of a polyphenylene ether resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.