Patent ID: 8017541

Claim:
A method for preparing a catalyst system that comprises the steps of: a) providing a metallic precursor M(Hal) n R′ v-n in a solvent, wherein M is a metal Group 6 to 10 of the Periodic Table, each Hal is the same or different and is halogen, each R′ is the same or different and is substituted or unsubstituted hydrocarbyl having from 1 to 20 carbon atoms, substituted or unsubstituted aryloxy or alkoxy, v is the valence of M and n is zero or an integer at most equal to v; b) complexing the metallic precursor of step a) with a ligand of formula wherein Cp is a cyclopentadienyl group, unsubstituted or substituted, and wherein Y comprises an alkyl, aryl, heterocycle or a non-heterocycle group, wherein the non-heterocycle group comprises an ether group, thioether group, phosphine group, imine group, amine group or amide group c) adding an activating agent having an ionizing action.