PROCESS FOR PREPARING SATURATED AND UNSATURATED ELASTOMERIC COPOLYMERS OF ETHYLENE AND/OR HIGHER ALPHA-OLEFINS

A process for the preparation of elastomeric copolymers of ethylene and/or alpha-olefins, saturated and unsaturated, comprising copolymer compositions of ethylene with alpha-olefins of the formula CH2 = CH-R, where R is an alkyl radical with 1 to 6 carbon atoms, or copolymers of said alpha-olefins with each other, or elastomeric copolymers of ethylene with the aforementioned CH2CH-R alpha-olefins and with hydrocarbon monomers containing more than one double bond for the polymerization of monomer mixtures with Ziegler catalysts characterized by the polymerization being carried out in a liquid medium consisting of at least 50% by weight of the monomers to be polymerized with the help of a catalyst obtained by combining, a) a product obtained by contacting a titanium compound with a support consisting of an anhydrous halide of Mg, Mn or Ca, under conditions that produce the conversion of the anhydrous halide to the active form, so that, in its spectrum of X-ray powder, the strongest diffraction line in the X-ray powder spectrum of unactivated anhydrous halide, appears less intense and is replaced by a diffuse halo, and/or has a surface extension greater than 5 m2/g, or using in a previously activated form the same halide, whose X-ray spectrum and/or whose surface extension have the characteristics indicated above, and b) a hydride or a metallo-organic compound of the metals of groups I, II and III of the Periodic System. (Machine-translation by Google Translate, not legally binding)