Olefin polymerisation catalyst
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United States of America Patent
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Jul 18, 2006
Grant Date -
May 20, 2004
app pub date -
Sep 17, 2001
filing date -
Sep 19, 2000
priority date (Note) -
Expired
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Abstract
The invention concerns a catalyst for olefin polymerisation, of formula (I) wherein: E is an oxygen or sulphur atom; X is a phosphorus, arsenic or antimony atom; M is a nickel, palladium or platinum atom comprising a non-attributed valency; a is 1 or 2; R.sub.1, R.sub.2, R.sub.3, identical or different can be selected among hydrogen, alkyl, cycloalkyl, aryl, alkylaryl, arylalkyl radicals, the hydroxyl radical, the alkoxide radicals (with 1 to 20 carbon atoms), the groups --C(O)OR'--, --SO.sub.3Y; and Z represents a hydrocarbon radical comprising 2 to 3 carbon atoms; R represents a hydrocarbon radical of valency a, provided that at least one of the radicals Z or R bears at least an electroattractive substituent ##STR00001##
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