METHOD FOR POLYMERIZING POLYPROPYLENE
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United States of America Patent
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Nov 8, 2010
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Nov 8, 2010
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Abstract
The present disclosure relates to a method for polymerizing polypropylene, optionally with one or more additional comonomers in a gas phase reactor in the presence of a mixed electron donor system comprising at least one selectivity control agent and at least one activity limiting agent. The process involves controlling the polymerization process to ensure that the difference between the reactor temperature and the dew point temperature of the incoming monomer stream is 12° C. or greater.
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