Patent ID: 7579417

Claim:
A metallocene compound of formula (IV): wherein: M is a transition metal selected from group 3, 4, 5, 6 or a lanthanide or an actinide group in the Periodic Table of Elements; p is an integer from 0 to 3, wherein p is equal to a formal oxidation state of M minus 2; X, is the same or different, and is hydrogen, a halogen, R, OR, OSO 2 CF 3 , OCOR, SR, NR 2 or PR 2 , wherein R is a C 1 -C 40 hydrocarbon group optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; or two X can optionally form a substituted or unsubstituted butadienyl radical, or a OR′O group, wherein R′ is a divalent radical selected from a C 1 -C 40 alkylidene radical, a C 6 -C 40 arylidene radical, a C 7 -C 40 alkylarylidene radical or a C 7 -C 40 arylalkylidene radical; L is a divalent bridging group selected from a C 1 -C 20 alkylidene radical, a C 3 -C 20 cycloalkylidene radical, a C 6 -C 20 arylidene radical, a C 7 -C 20 alkylarylidene radical, or a C 7 -C 20 arylalkylidene radical optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements, or a silylidene radical comprising up to 5 silicon atoms; R 1 is a C 1 -C 40 hydrocarbon group optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; R 3 is a C 1 -C 40 hydrocarbon group optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; R 2 , R 4 and R 5 , are the same or different from each other, and are hydrogen or C 1 -C 40 hydrocarbon groups optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements, with the proviso that at least one among R 2 , R 4 and R 5 is hydrogen; R 6 and R 7 , are the same or different from each other, and are hydrogen or C 1 -C 40 hydrocarbon groups optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; R 15 and R 16 , are the same or different from each other, and are hydrogen or C 1 -C 40 hydrocarbon groups optionally comprising at least one heteroatom belonging to groups 13-17 of the Periodic Table of Elements; and R 3 with R 4 and/or R 4 with R 5 can optionally join to form a aliphatic or aromatic 3-7 membered ring optionally comprising at least one heteroatom belonging to groups 13-16 of the Periodic Table of Elements, the aliphatic or aromatic 3-7 membered ring optionally can comprise one or more hydrocarbon substituents comprising from 1 to 20 carbon atoms.