Compatible polymer blends containingA) 0.5-99.5 wt. %, preferably 50 to 90 wt. % of a polyphenylene ether, synthesized from units of formula (I) ##STR1## where R.sub.1 stands for an optionally substituted (cyclo)alkyl group or alkoxyl group having 1 to 8 carbon atoms or an optionally substituted aryl group having 6 to 10 carbon atoms or for chlorine,where R.sub.2 stands for an optionally substituted (cyclo)alkyl group or alkoxyl group having 1 to 8 carbon atoms or an optionally substituted aryl group having 6 to 10 carbon atoms or for chlorine, andB) 99.5-0.5 wt. %, preferably 50 to 10 wt. % of a polyaryl(meth)acrylate containing 20-100 wt. % of monomers of the formula (II) ##STR2## where R.sub.3 stands for hydrogen or methyl, Q stands for an alkylidene group having 1 to 6 carbon atoms or a group --(CH.sub.2).sub.m --O--, where m denotes a number from 2 to 6,x stands for zero or 1 andR.sub.4 stands for hydrogen, an alkyl or alkoxyl group having 1 to 6 carbon atoms or an aminoalkyl group having 1 to 6 carbon atoms, which may be substituted at nitrogen with alkyl groups having 1 to 6 carbon atoms.