| 摘要 |
This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.In one embodiment, the metallocenes of the present invention may be represented by the formula:wherein:M is a metal of Group 4, 5, or 6 of the Periodic Table;R1 and R2 are identical or different, and are one of 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-C40 alkenyl group, a C7-C40 arylalkyl group, a C7-C40 alkylaryl group, a C8-C40 arylalkenyl group, or a halogen atom, or are a conjugated diene which is optionally substituted with one or more hydrocarbyl, tri(hydrocarbyl)silyl groups or tri(hydrocarbyl)silylhydrocarbyl groups, said diene having up to 30 atoms not counting hydrogen;R5 and R6 are identical or different, are one of a hydrogen atom, a halogen atom, a C1-C10 alkyl group, which may be halogenated, a C6-C10 aryl group, which may be halogenated, a C2-C10 alkenyl group, a C7-C40 -arylalkyl group, a C7-C40 alkylaryl group, a C8-C40 arylalkenyl group, a -NR215, -SR15, -OR15, -OSiR315 or -PR215 radical, wherein: R15 is one of a halogen atom, a C1-C10 alkyl group, or a C6-C10 aryl group,;R7 is wherein:R17 to R24 are as defined for R1 and R2, or two or more adjacent radicals R17 to R24, including R20 and R21, together with the atoms connecting them form one or more rings;M2 is carbon, silicon, germanium or tin;the radicals R3, R4, and R10 are identical or different and have the meanings stated for R5 and R6; or two adjacent R10 radicals can be joined together to form a ring system.
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