Catalyst removal from polyphenylene oxides by ammonia and carbon dioxide
US3988298A · kind A · utility
2Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1975 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | May 12, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention provides a novel method for the removal of the catalyst from a polyphenylene oxide polymerization mixture. The novel method is based on the discovery that ammonia and carbon dioxide may be employed to extract the catalyst from a polyphenylene ether reaction mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.