Polyphenylene oxide preparation in an aqueous dispersion
US4581439A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | May 29, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyphenylene oxides are prepared by the catalytic reaction of oxygen with at least one monohydroxyaromatic compound in a system which includes an organic solvent and an aqueous phase comprising a solution of at least one inorganic halide salt, preferably sodium bromide. This system enables the reaction to be conducted in the presence of the aqueous phase without deactivating the oxidative coupling catalyst. This system preferably also contains a minor amount of at least one surfactant selected from the group consisting of cationic surfactants having an HLB within the range of about 12-15 and amphoteric surfactants. The presence of a surfactant facilitates polymer recovery by promoting formation of readily filterable solid polymer particles in the aqueous system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.