Patent ID: 7335711

Claim:
A process for the polymerization of an ethylenically unsaturated monomer comprising: (a) providing a metallocene catalyst component characterized by the formula: B(FluL)MQ n (3) wherein: (i) Flu is a fluorenyl group substituted symmetrically with hydrocarbyl groups at at least the 2,7 positions and the 3,6 positions, wherein said substitutions at the 2,7 positions are selected from the group consisting of aryl groups and C 1 to C 3 alkyl groups; (ii) L is a substituted or an unsubstituted cyclopentadienyl group, a substituted or unsubstituted indenyl group, a substituted or unsubstituted fluorenyl group, or a heteroorgano group XR in which X is a heteroatom from Group 15 or 16 of the Periodic Table, and R is an alkyl group, a cycloalkyl group or an aryl group containing from 1 to 20 carbon atoms; (iii) B is a structural bridge between L and Flu imparting stereorigidity to the ligand structure (FluL); (iv) M is a Group 4 or Group 5 transition metal; (v) Q is selected from the group consisting of Cl, Br, I, an alkyl group, an amino group, an aromatic group and mixtures thereof; and (vi) n is 1 or 2; (b) providing an activating cocatalyst component; (c) contacting said metallocene component and said cocatalyst component in a polymerization reaction zone with an ethylenically unsaturated monomer under polymerization conditions to produce a polymer product by the polymerization of said monomer; and (d) recovering said polymer product from said reaction zone.