Co-catalysts for metallocene complexes in olefin polymerization reactions
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United States of America Statutory Invention Reg
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-
Jan 7, 2003
Grant Date -
N/A
app pub date -
Sep 18, 2000
filing date -
Sep 18, 2000
priority date (Note) -
Expired
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Abstract
The present invention provides cocatalysts for activating metallocene complexes in olefin polymerization reactions, and metallocene catalyst systems using the cocatalysts. The cocatalysts of the present invention include: (a) a halo-organoaluminum compound of the formula Al.sub.n R.sub.m X.sub.3n-m, where Al is aluminum, each R is independently a C.sub.l to C.sub.4 alkyl group, X is a halide, n is 1 or 2, and m is determined by the valency of Al; and (b) a dialkylmagnesium compound of the formula MgR'.sub.2, where Mg is magnesium and R' is a C.sub.2 to C.sub.6 alkyl group. The components (a) and (b) are used in amounts such that the molar ratio of Al:Mg is at least 2, preferably from 2:1 to 5:1.
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