Catalyst system, method for producing same and its use for the polymerization of olefins
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United States of America Patent
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May 21, 2002
Grant Date -
N/A
app pub date -
Aug 16, 2000
filing date -
Feb 27, 1998
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Expired
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Abstract
A catalyst system comprising a) at least one support, b) at least one metallocene and c) at least one compound of the formula (I) ##STR1## where M.sup.1 is an element of group IIa, IIIa, IVa or Va of the Periodic Table of the Elements, x is 0 or 1, y is 0 or 1, z is 0 or 1, A is a cation of group Ia, IIa, IIIa of the Periodic Table of the Elements, a carbenium, oxonium, phosphonium or sulfonium cation or a quaternary ammonium compound, Q.sup.1, Q.sup.2, Q.sup.3 are each a ligand system based on a biphenyl framework bound to M.sup.1 via the positions 2 and 12 and having the formula (II) ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are identical or different and are each a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.40 group, or an OSiR.sub.3.sup.9 group, where R.sup.9 are identical or different and are each a hydrogen atom, a halogen atom, a C.sub.1 -C.sub.40 group and two or more radicals R.sup.1 to R.sup.8 may be joined to one another so as to form a monocyclic or polycyclic ring system which may be substituted.
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