Catalyst system for .alpha.-olefin oligomerization
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United States of America Patent
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Apr 16, 2002
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N/A
app pub date -
Apr 15, 1999
filing date -
Apr 15, 1998
priority date (Note) -
Expired
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Abstract
It is disclosed a new catalyst system, having high catalytic activity in the oligomerization of .alpha.-olefins, comprising a bridged bis-amido Group 4 metal compound of formula (I): ##STR1## wherein M is Ti, Zr or Hf; Y is Si, Ge or Sn; X is a hydrogen, halogen or an hydrocarbon radical; R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are hydrocarbon radicals, optionally containing Si, Ge, O, S, P, B or N atoms; Q is a neutral Lewis base; and m is 0-2; in association with a boron activating compound, and with one or more branched alkylaluminiums and/or alumoxanes of branched alkylaluminiums; said catalyst system allows oligomers to be obtained in high yields, with a high selectivity towards .alpha.-oligomers.
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