Process for the production of polyphenylene-oxide
US4607085A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1984 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | Dec 3, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the production of polyphenyleneoxide, in which: PA0 oxygen, or a gas containing molecular oxygen is fed into a liquid reaction medium, solvent of the 2,6-xylenol and of the catalyst cupric salt complexed with an organic base, but nor solvent or substantially not solvent of the polyphenyleneoxide; PA0 from time to time samples are collected of the reaction mixture, said samples are treated with a liquid solvent, capable of dissolving polyphenyleneoxide and of stopping the growth of the macromolecules, until a clear and homogeneous solution is obtained; PA0 the through time of the so obtained solution is measured in a capillary tube viscometer and the value is determined of the viscosity and/of the molecular weight of polyphenyleneoxide by the comparison with standard values; and PA0 on the basis of the so determined value of the viscosity and/or of the polyphenyleneoxide molecular weight interventions are effected on the oxidative polymerizing reaction of 2,6-xylenol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.