Patent ID: 6407273
Filing Date: 2002-06-18
Classification: C07F,C08F,Y10S

Abstract:
A metallocene compound having the general formula:CpAXMQ1Q2Cpâ€²Aâ€²Xâ€²Mâ€²Q1â€²Q2â€²wherein Cp and Cpâ€² are each independently a substituted or unsubstituted cyclopentadienyl moiety wherein each said cyclopentadienyl moiety is substituted or unsubstituted indenyl; M and Mâ€² are each a metal chosen from Group IV B transition metals and vanadium, and coordinate to Cp and Cpâ€² respectively; X and Xâ€² are each independently a substituted or unsubstituted Group VA or VIA heteroatom and coordinate to M and Mâ€² respectively; A and Aâ€² are bridging groups between Cp and X and between Cpâ€² and Xâ€² respectively and are independently chosen from â€”SiRâ€²2â€”Oâ€”SiRâ€²2â€”SinRâ€²mâ€”, â€”CnRâ€²mâ€” and â€”CRâ€²2â€”SiRâ€²2â€”CRâ€²2â€”SiRâ€²2â€”, in which each Râ€² is independently H or hydrocarbyl having 1 to 20 carbon atoms, n is an integer in the range 1 to 4 and m=2n; each Q1, Q2 and Q1â€² and Q2â€² is independently a coordinating group which is hydrogen, halogen, or hydrocarbyl having 1 to 20 carbon atoms and each of Q1 and Q1â€² is coordinated to both M and Mâ€².