COMPONENTS AND CATALYSTS FOR THE POLYMERIZATION OF OLEFINS

摘要

Catalyst component for the polymerization of olefins obtainable by contacting: (i) a magnesium halide, or a suitable precursor; (ii) a monofunctional electron donor compound (MD) selected from ethers, esters, amines or ketones, used in such amounts to have Mg/MD molar ratios of at least 50; (iii) a titanium compound of formula Ti(OR )n-yXy, where n is the valence of titanium, y is a number between 1 and n, X is halogen, and R is a C1-C15 hydrocarbon group and, optionally, (iv) an electron donor compound (ED). The said catalyst component shows improved activity in the polymerization of olefins.