Abstract: The method for protection of vinyl polymers from thermo-oxidative degradation in adding to the vinyl polymers inhibitors, viz., poly(arylene alkylenes) having the general formula --Ar.sub.1 --CH.sub.2).sub.k ].sub.m AR.sub.2 [(CH.sub.2).sub.k Ar.sub.1 ].sub.n,Where Ar.sub.1 and Ar.sub.2 are ##STR1## m+n=2 to 30, k=1 or 2; if k=1, then Ar.sub.1 and Ar.sub.2 are also ##STR2## where X = H; or C.sub.1 - C.sub.4 alkyl; or their hydroperoxides taken in the quantity from 0.01 to 10 per cent of the weight of vinyl polymers. The proposed method ensures prolonged and effective protection of vinyl polymers from thermo-oxidative degradation.

Abstract: A process for producing vinyl polymers involving polymerization of vinyl monomers in the presence of polyarylenealkylenes of the formula: ##STR1## WHEREIN Ar.sub.1 and Ar.sub.2 are ##STR2## m + n + 2 to 30, k = 1 or 2, at k = 1 Ar.sub.1 and Ar.sub.2 are also ##STR3## where X is H, a C.sub.1 -C.sub.4 alkyl, or in the presence of hydroperoxides of said polyarylenealkylenes; said polyarylenealkylenes or hydroperoxides thereof are used in an amount ranging from 0.01 to 15% by weight of the starting vinyl monomers. The process of the present invention makes it possible to obtain vinyl polymers featuring an enhanced heat-resistance and, in some cases, improved mechanical and electrical properties.