Process for purifying polyphenylene oxides obtained by interruption of the copper-amine catalyzed polycondensation of ortho-disubstituted phenols
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United States of America Patent
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Apr 21, 1987
Grant Date -
N/A
app pub date -
Jul 18, 1984
filing date -
Sep 8, 1983
priority date (Note) -
Expired
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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.
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