Intrinsic viscosity control of polyphenylene ether reaction mixtures
US4116939A · kind A · utility
16Cited by
4References
25Claims
0Family size
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Key dates
| Filing date | Dec 20, 1976 |
| Grant date | Sep 26, 1978 |
| Priority date | — |
| Expiry date | Dec 20, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyphenylene ethers produced by an oxidative coupling of a phenol in the presence of an oxygen-containing gas and a metal-amine complex catalyst are freed of catalyst and stabilized against molecular weight loss. Removal of the metal component and molecular weight loss control are effected by contacting the reaction mixture with an aromatic amine plus a metal chelating agent, which stabilizes the intrinsic viscosity of the polyphenylene ether in the reaction mixture. This procedure results in lower catalyst usage and shorter reaction time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.