Polymerisation process
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United States of America Patent
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Issued Date -
May 31, 2007
app pub date -
Jan 14, 2005
filing date -
Jan 22, 2004
priority date (Note) -
Abandoned
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Abstract
A process for the copolymerisation of ethylene and an .alpha.-olefin having 7 to 10 carbon atoms in a fluidised bed gas phase reactor in the presence of a single site polymerisation catalyst comprises operating the process in condensed mode and wherein the amount of said .alpha.-olefin is maintained below that at which substantial condensation in the reactor occurs. The preferred .alpha.-olefin is 1-octene and the preferred single site polymerisation catalyst is a metallocene complex. By use of the process conditions of the present invention, higher .alpha.-olefins may be successfully employed in a gas phase process provided the amount of higher .alpha.-olefin comonomer is maintained below that at which substantial condensation occurs: Such operation is also dependent upon the operation temperature and the boiling point of the higher .alpha.-olefin and the process is particularly advantageous when performed in the presence of catalysts able to incorporate high levels of comonomers at low comonomer inventories.
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