Process for purifying polyphenylene oxides obtained by interruption of the copper-amine catalyzed polycondensation of ortho-disubstituted phenols

US4659803A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Martin Bartmann · Recklinghausen, DE
• Hanns-Jorg Bax · Marl, DE
• Klaus Burzin · Marl, DE
• Wilfried Ribbing · Dorsten, DE
• Srinivasan Sridhar · Marl, DE

Key dates

• Filing date: Jul 18, 1984
• Grant date: Apr 21, 1987
• Expiry date: Jul 18, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/005
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for purifying polyphenylene oxides obtained by interruption of the copper-amine catalyzed polycondensation of di-ortho-substituted phenols, where in said process the reaction mixture is subjected to a "reaction-extraction" (i.e., an extraction which is accompanied by reaction) with water or stream, at a temperature of 60.degree. to 150.degree. C. It is particularly advantageous if the starting mixture in the inventive process comprises a solution of the polyphenylene oxide wherein the reaction has been interrupted by water and CO.sub.2, which solution is mixed into a toluene/water mixture; and further if the "reaction-extraction" is carried out in the presence of an alkanolamine and a stabilizer.