Patent ID: 8497331

Claim:
An active catalyst system consisting essentially of: a metallic complex represented by general formula I wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 are each independently selected from hydrogen, C 1 to C 20 hydrocarbyls or inert functional groups and wherein two or more of those groups can be linked together to form rings, M is a metal of Group 3 to 10 of the Periodic Table, Y is O, each X is independently selected from halogens, m is zero or an integer from 1 to 3, (n+2) is the valence of M; and wherein and an activating agent that is an aluminum-containing complex, wherein the active catalyst system comprises an Al/M ratio ranging from 100 to 3000, wherein at least one of R 1 , R 6 and R 7 is not hydrogen.