Two-stage continuous process for preparation of polyphenylene oxides
US4477649A · kind A · utility
23Cited by
7References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1983 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Mar 25, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00166
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyphenylene oxides are prepared by the catalytic reaction of oxygen with a monohydroxy aromatic compound such as 2,6-xylenol in a two-stage continuous process. The first stage is effected in at least one and preferably no more than two tank reactors, and the second stage in a reaction system with limited back-mixing, typically a cylindrical reactor containing multiple agitated zones. In a preferred embodiment of the invention, the non-gaseous constituents of the reaction mixture are pre-mixed in an inert atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.