POLYMERISATION PROCESS
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United States of America Patent
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Issued Date -
Jan 13, 2011
app pub date -
Feb 24, 2009
filing date -
Mar 20, 2008
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Abstract
The present invention relates to a polymerisation process and in particular to a process for the copolymerisation of ethylene and an α-olefin comonomer having 7 to 10 carbon atoms in a fluidised bed gas phase reactor in the presence of a multi-site Ziegler-Natta polymerisation catalyst characterised in that (i) said process is operated in condensed mode, (ii) the amount of said α-olefin is maintained below that at which substantial condensation in the reactor occurs and (iii) at least one of the following apply:a) the catalyst has an uptake rate of 1-octene of at least 700;b) the polymerisation is performed in the presence of an activity promoter.
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