Patent ID: 7842764

Claim:
A catalyst system for polymerizing at least one olefin, the catalyst system obtained by contacting: a metallocene compound of formula (II): wherein M is a Group 3 or 4 metal or a lanthanide or actinide element; X, equal to or different from each other, is hydrogen, a halogen, R, OR, OR′O, OSO 2 CF 3 , OCOR, SR, NR 2 , or PR 2 ; R is a linear or branched, cyclic or acyclic C 1 -C 40 -alkyl, C 2 -C 40 alkenyl, C 2 -C 40 alkynyl, C 6 -C 40 -aryl, C 7 -C 40 -alkylaryl or C 7 -C 40 -arylalkyl, optionally comprising at least one Group 13-17 heteroatom; R′ is a C 1 -C 20 -alkylidene, C 6 -C 20 -arylidene, C 7 -C 20 -alkylarylidene, or C 7 -C 20 -arylalkylidene; L is a divalent bridging group selected from a C 1 -C 20 alkylidene, a C 3 -C 20 cycloalkylidene, a C 6 -C 20 arylidene, a C 7 -C 20 alkylarylidene, or a C 7 -C 20 arylalkylidene, optionally comprising at least one Group 13-17 heteroatom, or L is a silylidene radical comprising up to 5 silicon atoms; R 1 is a linear C 1 -C 40 hydrocarbon optionally comprising at least one Group 13-17 heteroatom; and each of R 4 , R 6 , R 7 , R 8 , R 9 , R 10 R 11 and R 12 is independently hydrogen or a C 1 -C 40 hydrocarbon, optionally comprising at least one Group 13-17 heteroatom; at least an alumoxane or a compound capable of forming an alkylmetallocene cation; and optionally, an organo aluminum compound.