Two-stage process for preparation of polyphenylene oxides
US4578449A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1985 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Feb 26, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00184
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyphenylene oxides are prepared by the catalytic reaction of oxygen with a monohydroxyaromatic compound such as 2,6-xylenol in a solvent for reactants and product, in a two-stage process. The first stage is effected continuously in at least one and preferably not more than two back-mixed (e.g., tank) reactors, and the second stage in one or more batch reactors or, preferably, in a reaction system with limited back-mixing, typically a cylindrical reactor containing multiple agitated zones. In the case of a copper catalyst system, it is also preferred to pre-mix the non-gaseous constituents of the reaction mixture in an inert atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.