| 摘要 |
<p>Polyphenylene ethers, prepared by oxidative polycondensation of alkylphenols, in the presence of copperamine catalysts, are decolorized from the reaction by-products and purified from the residues of catalytic copper by treatment, in an acid medium, with one or more thiolic compounds comprised in the general formula. R - (SH)n wherein: n = a whole number ranging between 1 and 6, extremes included R = an alkyl, an aryl, an alkaryl, an aralkyl, a cycloalkyl, a heterocyclic group, a hydrocarbon radical having several non-condensed benzene rings, optionally substituted by alkyl and/or alkoxy, hydroxy, aminic, sulphonic, carboxylic, nitric, sulphydrilic radicals, halogens.</p> |
