Process for the production of polyphenylene ethers having a desired polymerization degree
US3970640A · kind A · utility
20Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1974 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jun 26, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyphenylene ethers, self-condensation products of phenols, having desired polymerization degree are prepared by a process which comprises terminating the reaction by adding simultaneously at least one member selected from the class consisting of dioxybenzenes and/or benzoquinones and a reducing agent to the reaction medium at the stage of the desired polymerization degree in the oxidative polycondensation of phenols in the presence of a complex catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.