Carbon and/or silicon bridged binuclear metallocene catalyst for styrene polymerization

摘要

An alkylene and/or silylene bridged binuclear metallocene catalyst for styrene polymerization is represented by the following formula (I): ##STR1## where M.sup.1 and M.sup.2 are the same or different transition metal of Group IVb of the Periodic Table; Cp.sup.1 and Cp.sup. 2 are the same or different cyclopentadienyl; alkyl, alkoxy, silyl or halogen substituted cyclopentadienyl; indenyl; alkyl, alkoxy, silyl or halogen substituted indenyl; fluorenyl; or alkyl, alkoxy, silyl or halogen substituted fluorenyl, which is capable of &pgr;-electron, &eegr;. sup.5 - bonding with M.sup.1 or M.sup.2 ; each of E.sup.1, E.sup.2 and E. sup.3, independently of one another, is a carbon atom or a silicon atom; m, p and q are integers of 0 to 15 and m+p+q≧1; each of R.sup.1, R.sup. 2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6, independently of one another, is a hydrogen, an alkyl, an aryl, an alkoxy or a halogen; X is a hydrogen, an alkyl, an alkoxy or a halogen; and n is 3. M.sup.1 and M. sup.2 may also be in cardin form by mixture of (I) with a compound which abstructs an X gray from each metal atom and substitution then with non- coordinating anions.