Patent ID: 7547654
Filing Date: 2009-06-16
Classification: C08F,Y10S

Abstract:
1. A catalytic system for obtaining a copolymer of a conjugated diene and at least one monoolefin, which comprises: (i) an organometallic complex represented by the following generic formula: Ln represents a lanthanide atom of an atomic number from 57 to 71, to which is attached a ligand molecule comprising cyclopentadienyl Cp and fluorenyl Fl groups which are each independently substituted or unsubstituted and linked to one another by a bridge P of the formula MR X represents a halogen atom, L comprises an optional complexing molecule and optionally a substantially less complexing molecule, p is a natural integer greater than or equal to 1 and x is greater than or equal to 0, and (ii) a co-catalyst selected from the group consisting of alkylmagnesiums, alkyllithiums, alkylaluminums, Grignard reagents and mixtures of these constituents.