Patent ID: 8420756

Claim:
An active catalyst system comprising: a catalyst component of formula II or of formula II′ obtained by condensation reacting of a metallic salt MX n and a bidentate ligand of formula I wherein R 1 , R 2 , R 3 , R 4 are each independently selected from the group consisting of unsubstituted or substituted alkyl groups, unsubstituted or substituted aryl groups, and unsubstituted or substituted cycloalkyl groups; wherein R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 are each independently selected from the group consisting of hydrogen, unsubstituted or substituted hydrocarbyls and inert functional groups, and wherein two or more R′s can be linked together to form further ring or rings; wherein M is a metal Group 3 to 10 of the periodic Table, each X is the same or different and is selected from halogens, alcoholates, carboxylates and substituted or unsubstituted hydrocarbyls and n is the valence of M; and an activating agent having an ionising action.