CATALYSTS BASED ON VANADIUM, THEIR PREPARATION AND USE IN THE (CO)POLYMERIZATION OF ALPHA-OLEFINS

摘要

Vanadium complex having general formula (I) (RCOO)n VX p L m (I) wherein R is a monofunctional hydrocarbon radical having from 1 to 20 carbon atoms and from 1 to 6 halogen atoms, selected from chlorine and bromine, preferably chlorine; X is chlorine or bromine, preferably chlorine; L is an electron donor; p+n= 3, 4 or 5, preferably = 3; n is greater than or equal to 1; m is between 0 and 3. The preparation of the above complex is also described together with its use in the (co)polymerization of .alpha.-olefins.