Disclosed in an olefin polymerization catalyst comprising a transition metal compound having at least two transition metals in which at least one of said metals is bonded to a ligand having a cyclopentadienyl skeleton, at least one of said metals is selected from Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo,...http://www.google.com.au/patents/US5627117?utm_source=gb-gplus-sharePatent US5627117 - Olefin polymerization catalyst and process for olefin polymerization
