Method of producing a polyphenylene ether protected against molecular weight degradation, where the copper salt employed in the coupling reaction can be reused
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United States of America Patent
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Dec 2, 1986
Grant Date -
N/A
app pub date -
May 10, 1985
filing date -
May 25, 1984
priority date (Note) -
Expired
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Abstract
The invention relates to a method for producing a polyphenylene ether, in which the oxidative coupling reaction of a di-ortho-substituted phenol is carried out in a solvent comprised of a chlorinated hydrocarbon, an aromatic solvent, or a mixture of one of these solvents with an alcohol or ketone. The reaction is terminated by removing or using up the oxygen-containing reaction gas, adding hydrazine to the reaction mixture, and filtering out the resulting precipitate. The precipitate may be reused along with a suitable amine, to comprise a catalyst for a subsequent oxidative coupling reaction.
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