Improved polyphenylene ether polymerization process using methylene chloride as solvent
US4035357A · kind A · utility
1Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1976 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Oct 18, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel process is disclosed for the polymerization of phenols, e.g., xylenols, and recovery of polyphenylene ethers from the polymerization mixture. The method is based on the use of hot methylene chloride as a reaction solvent, elevated oxygen pressure and separation of the polyphenylene ether as a solid complex with methylene chloride upon cooling. Also a feature is the recycle and recovery of methylene chloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.