Patent ID: 6984703

Claim:
A metallocene compound having formula (I): wherein: R 1 and R 2 can independently occupy any of the free positions of the indene group; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 independently represent hydrogen, halogen, a linear or branched, saturated or unsaturated, cycloaliphatic or aromatic C 1 –C 20 hydrocarbyl group, or a C 1 –C 20 hydrocarbyl group substituted with one or more halogen atoms, or a C 1 –C 20 hydrocarbyl group comprising one or more heteroatoms of groups 14 to 16 of the periodic table of elements; wherein any two, or both pairs, of the substituents R 3 , R 4 , R 5 and R 6 , adjacent to each other, may be joined to each other to form a saturated or unsaturated C 4 –C 20 cyclic structure, comprising a bond of the cyclopentadienyl ring, said structure optionally containing one or more heteroatoms; M represents titanium, zirconium or hafnium; X 1 and X 2 each independently represent an anionic group bound to the metal M, wherein X 1 and X 2 may be chemically bound to each other to form a cycle having from 4 to 7 atoms different from hydrogen, also comprising the metal M.