Metallocene catalyst for the (CO)polymerization of .alpha.-olefins
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United States of America Patent
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May 19, 1998
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N/A
app pub date -
Jun 21, 1996
filing date -
Jul 6, 1995
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Abstract
A catalyst active in the (co)polymerization of .alpha.-olefins is obtained by putting the following components in contact with each other: (i) a 'bridged' bis-metallocene derivative of a metal M selected from titanium, zirconium or hafnium, wherein the divalent 'bridge' has a rigid structure linked to two .eta..sup.5 -cyclopentadienyl ring with two methylene groups having a distance from each other of less than 3.5 .ANG.; (ii) a co-catalyst consisting of an organic derivative of a metal M' selected from boron, aluminium, gallium and tin. Such a catalyst allows high polymerization rates to be reached and is particularly suitable for high temperature polymerization process and co-polymerization of ethylene with other .alpha.-olefins.
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