Process for preparing polyphenylenethers
US4639506A · kind A · utility
1Cited by
7References
6Claims
0Family size
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Key dates
| Filing date | Apr 9, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Apr 9, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyphenylenethers are prepared by oxidative polymerization of phenols in the presence of oxygen and of organic bases (amines), by using copper-based catalysts having general formula: EQU (B).sub.n (Cu).sub.a X.sub.b Y.sub.z wherein PA1 B=optionally substituted naphthiridie group, PA1 X=halogen, or nitro group or perchlorate group, PA1 Y=bridge compound between the copper atoms, of the pyrazole or imidazole type, PA1 z=0 or 1, wherefore: when z=0, PA2 a and n, either like or unlike each other, are 1 or 2, PA1 b=an integer from 1 to 3, extremes included, while, when z=1: PA2 n=a=2 PA2 b=3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.