Process for preparing polyolefinic elastomeric compositions by dynamic vulcanizaion

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 comprising: (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: ##STR4## wherein: X 1 , X 2 , the same or different, are --CH 2 -- or --CH 2 --O--CH 2 -- radicals; R is an alkyl, aryl or alkenyl radical containing from 4 to 16 carbon atoms; n is an integer comprised between 0 and 6, extremes excluded; and (b) a metal compound selected from zinc oxide, magnesium oxide, iron oxide, titanium dioxide, calcium oxide, aluminum, silicon and calcium carbonate oxides, in a ponderal ratio with the phenolic resin comprised between 3 and 5; at a temperature sufficient to melt said olefinic polymer and for a time sufficient for obtaining a homogeneous mixture, and by then continuing the mastication at a temperature at which there occurs at least a partial cross-linking of the elastomeric terpolymer.