Preparation of polyphenylene ethers in the presence of defoamer

US5237039A · kind A · utility

Assignee

• BASF SE

Inventors

• Doris Zeltner · Wasserburg am Inn, DE
• Peter Steieri · Ludwigshafen, DE
• Heike Feldman · Mannheim, DE
• Klaus Muehlbach · Havelsee, DE
• Carola Hedtmann-Rein · Hirschberg, DE
• Bernhard Czauderna · Hirschberg, DE
• Karl Hennig · Heßheim, DE

Key dates

• Filing date: Apr 30, 1992
• Grant date: Aug 17, 1993
• Expiry date: Apr 30, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/44
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyphenylene ethers are prepared from monohydric phenols by oxidative coupling with oxygen-containing gases in the presence of an oxidation catalyst in an organic solvent by carrying out the polycondensation in the presence of a defoamer.