ORGANOMETALLIC TRANSITION METAL COMPOUND, BISCYCLOPENTADIENYL LIGAND SYSTEM, CATALYST SYSTEM AND PROCESS FOR PREPARING POLYOLEFINS

摘要

The present invention relates to organometallic transition metal compounds of formula (I) where M<1> is an element of group 3, 4, 5 or 6 of the Periodic Table of the Elements or the lanthanides, X are identical or different and are each halogen, hydrogen, C1-C20-alkyl, C2-C20-alkenyl, C6-C22-aryl, alkylaryl or arylalkyl each having from 1 to 10 carbron atoms in the alkyl part and from 6 to 22 carbon atoms in the aryl part, -OR<6> or -NR<6>R<7>, where two radicals X may also be joined to one another, n is a natural number from 1 to 4 which corresponds to the oxidation number of M<1> minus 2, R<1> is hydrogen or a C1-C40 radical, R<2> is a substituted or unsubstituted C6-C40-aryl radical or C2-C40-heteroaromatic radical containing at least one heteroatom selected from the group consisting of O, N, S and P, R<3> is hydrogen or a C1-C40 radical, or the radicals R<2> and R<3> together form a ring system, R<4> is hydrogen or a C1-C40 radical, R<5> is a C1-C40 radical, and Z is a divalent group CR<8>R<9>-CR<10>R<11>, where R<8>, R<9>, R<10> and R<11> are identical or different and are each hydrogen or a C1-C40 radical, biscyclopentadienyl ligand systems having such a substitution pattern, catalyst systems comprising at least one of the organometallic transition metal compounds of the present invention, a process for preparing polyolefins by polymerization or copolymerization of at least one olefin in the presence of one of the catalyst systems of the present invention and the use of the biscyclopentadienyl ligand systems of the present invention for preparing organometallic transition metal compounds.