| 摘要 |
<p>A process for the preparation of high molecular weight polyphenylene ethers from monohydric phenols which have alkyl substituents in both ortho-positions and may additionally have an alkyl substituent in one meta-position but not in the para-position, by an oxidative coupling reaction, employing oxygen, at from 10 to 25.degree.C, in the presence of a catalyst complex comprising a copper salt and an N-substituted imidazole, in the presence of an aromatic C8-C10-hydrocarbon solvent. N-Methylimidazole, N-ethylimidazole, N-isopropyl-imidazole, N-n-butylimidazole, N-cyclohexylimidazole, N-octylimidazole and N-phenylimidazole are preferably used as the imidazole, advantageously in amounts of from 0.5 to 5 percent by weight.</p> |
