Patent ID: 6861543

Claim:
Metallocene compounds of formula (I) having a racemic stereoisomerism wherein M is selected from zirconium and hafnium; X 1 and X 2 , the same or different, are selected from halogen, amide, carboxy, alkoxy, carbamate, alkyl, aryl, hydrogen; A′ and A″, the same or different, are a radical of the η 5 -tetrahydroindenyl type (Ia): wherein the groups R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , the same or different, are selected from hydrogen, a C 1 -C 8 aliphatic, C 5 -C 12 cycloaliphatic, C 6 -C 14 aryl radical; the groups R 1 , R 2 , R 3 , R 4 , the same or different, are selected from hydrogen, a C 1 -C 8 aliphatic, C 5 -C 12 cycloaliphatic, C 6 -C 14 aryl radical, halogen.