Process for the preparation of polyolefinic plasto-elastomeric compositions by means of dynamical vulcanization

Claim 1

Process for the preparation of plasto-elastomeric compositions, consisting in subjecting to mastication a mix consisting of 20% to 60% by weight of an olefinic polymer, and from 80% to 40% by weight of an unsaturated elastomeric terpolymer consisting of two α-olefinic monomers and of a dienic monomer, in the presence of a cross-linking system free of halogen donors and com- prising: (a) from 1 to 10 parts by weight, for 100 parts by weight of said terpolymer, of a non-halogenated phenolic resin of the following general formula: wherein: X 1 , X 2 , equal to or different from each other, are -CH- or -CH 2 -0-CH 2 - radicals; R = alkyl, aryl or alkenyl radical, containing from 4 to 16 carbon atoms; n = an integer comprised between 0 and 6, extremes excluded; and (b) a metal compound chosen from amongst zinc oxide, magnesium oxide, iron oxide, titanium dioxide, calcium oxide, aluminia, silica and calcium carbonate, in a. ponderal ratio with the phenolic resin comprised between 0.5:1 and 5:1; at a temperature sufficient for melting said olefinic polymer and for a duration sufficient for obtaining a homogeneous mixture, and by then continuing with the mastication at a temperature at which there will occur at least a partial cross-linking of the elastomeric terpolymer.