Patent ID: 6413899
Filing Date: 2002-07-02
Classification: C08F,Y10S

Abstract:
A metallocene comprising the formula I in whichM1 is a metal of group IVb, Vb or VIb of the periodic table, R1 and R2 are identical or different and are a hydrogen atom, a C1-C10-alkyl group, a C1-C10-alkoxy group, a C6-C10-aryl group, a C6-C10-aryloxy group, a C2-C10-alkenyl group, a C7-C40-alkenyl group, a C7-C40-arylakyl group, a C8-C40-arylalkenyl group or a halogen atom, R3, R4, R5 and R6 are identical or different and are a hydrogen atom, a halogen atom, a C1-C10-alkyl group, â€”NR102, â€”SR10, or â€”PR102, in which R10 is a halogen atom or a C1-C10-alkyl group, or pairs of adjacent radicals R3, R4, R5 and R6 form a ring with the C atoms to which they are bonded, and R7 is in whichR11, R12 and R13 are identical or different and are a hydrogen atom, a C1-C10-alkyl group, a C1-C10-fluoroalkyl group, a C6-C10-aryl group, a C6-C10-fluoroaryl group, a C1-C10-alkoxy group, a C2-C10-alkenyl group, a C7-C40-arylalkyl group, a C8-C40-arylalkenyl group or a C7-C40-alkylaryl group, or R11 and R12 and R13 form a ring with the atoms to which they are bonded, M2 is silicon, germanium or tin, P is 1, 2 or 3, R8 and R9 are identical or different and are a group &boxH;CR11R12, in which R11 and R12 are as defined above, and m and n are identical or different and are zero, 1 or 2, m+n being zero, 1 or 2, and the ring containing substituents R3 and R4 is different from the ring containing substituents R5 and R6.