Catalyst components for polymerization of olefins

Claim 1

A process for the manufacture of polyolefins which comprises polymerizing an olefinic hydrocarbon in the presence of a catalyst composition comprised of a first component (I) and a second component (II), said first component (I) resulting from the reaction of a compound (i) of the formula ##STR1## wherein R 1 is a hydrocarbon moiety of 1-24 carbon atoms, X 1 is a halogen atom, Me 1 is zirconium, titanium or hafnium, and n is an integer of 0≦n≦4; a compound (ii) of the formula ##STR2## wherein R 2 is a hydrocarbon group of 1-24 carbon atoms, X 2 is an alkoxy group of 1-12 carbon atoms or a halogen atom, Me 2 is an element of Groups I-III in the Periodic Table, z is the valence of Me 2 , and m is an integer of 0≦m≦3; an organocyclic compound (iii) having two or more conjugated double bonds represented by the formula (Cp).sub.r SiR.sub.s.sup.3 X.sub.4-r-s.sup.3 wherein Cp is a cyclopentadienyl group; R 3 is a hydrocarbon group of 1-24 carbon atoms; X 3 is a halogen atom; and r and s are 0<r≦4 and 0≦s≦3, respectively, where r+s≦4; and an inorganic carrier or particulate polymer carrier or mixtures thereof (iv), said second component (II) being a modified organoaluminum compound having Al--O--Al bonds derived from the reaction of an organoaluminum compound and water.