Patent ID: 7214744

Claim:
A process for the polymerization of at least one C 2 to C 8 alpha olefin monomer in the presence of a catalyst system comprising: (i) a catalyst compound; and (ii) an activator defined by the formula: wherein: X 1 and X 2 are selected from the group consisting of O, NR 1 , S; Y 1 and Y 2 are selected from the group consisting of CR 2 R 3 , SiR 4 R 5; and Z is selected from the group consisting of a bond, CR 6 R 7 , SiR 8 R 9 , NR 10 , and PR 11 , wherein each of R 1 to R 11 is selected from the group consisting of i) a C 1 to C 20 hydrocarbyl group and ii) a perfluorinated C 1 to C 20 hydrocarbyl group with the proviso that at least one of Y 1 and Y 2 contains at least one fluorine atom; and each L is independently fluorinated alkyl, fluorinated aryl, fluorinated alkoxy, fluorinated aryloxy, alkoxy or aryloxy ligand; n=0, 2, m=2, 1; 2m+n=4; and [Cat] + is a non-interfering cation.