Metallocenes with silyl-substituted bridges and their use for olefin polymerization
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United States of America Patent
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Aug 31, 1999
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N/A
app pub date -
Dec 22, 1997
filing date -
Jul 3, 1995
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Expired
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Abstract
The invention pertains to metallocenes of formula (I), wherein M is a metal group of the group of Ti, Zr, Hf, V, Nb and Ta or an element from the group of lanthanides; X.sub.1 and X.sub.2 stand for an alkyl, alkoxy, aryl, aryloxy, alkenyl, arylalkyl, alkylaryl or arylalkenyl group, hydrogen or halogen; L.sub.1 and L.sub.2 stand for a hydrocarbon which can form a sandwich structure with M; R stands for C, Si, Ge or Sn; and A and B stand for a trimethylsilyl radical, B optionally for an alkyl or aryl radical. ##STR1##
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