Polymerisation Catalysts
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United States of America Patent
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N/A
Issued Date -
Aug 27, 2009
app pub date -
Feb 15, 2006
filing date -
Feb 21, 2005
priority date (Note) -
Abandoned
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Abstract
A process for the polymerisation of ethylene or the copolymerisation of ethylene and alpha-olefins in the presence of a catalyst system comprising—as components (a) a transition metal compound, (b) a non-aluminoxane activator, and (c) optionally a support, comprises the use of a prepolymer prepared by contact of the catalyst components with ethylene and/or one of more alpha-olefins at a temperature in the range 60° C. to 100° C. The prepolymer may be isolated or used in situ for the polymerisation of ethylene or the copolymerisation of ethylene and alpha-olefins in particular 1-hexene. By use of the process thermal stability of the catalyst is improved leading to increased activity without any deterioration in polymer morphology.
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