Patent ID: 6538082
Filing Date: 2003-03-25
Classification: C07F,Y10S

Abstract:
Novel asymmetric silicon-bridged metallocenes useful as catalysts in the polymerization of olefins represented by the general formula (I):(SiRâ€²Râ€³)(Cp)(Cpâ€²)MXXâ€²â€ƒâ€ƒ(I) whereinCp is a partially or fully hydrogenated fluorenyl moiety selected from those of formula (II) and (III) Cpâ€² is an indenyl group selected from those of formula (IV) M represents Zr, X and Xâ€² each represent a chlorine atom, R1, R2 and R3 are, same or different from each other, and selected from the group consisting of methyl, aryl of 6 to 10 carbon atoms and hydrogen, wherein at least one of R2 and R3 is other than hydrogen; (SiRâ€²Râ€³) is a divalent group which bridges the two groups Cp and Cpâ€² repectively on position 9 and 1, Râ€² and Râ€³ are, same or different from each other, an alkyl or aryl group containing from 1 to 10 carbon atoms.