Catalyst composition with phosphorus-based donor and method
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United States of America Patent
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Dec 24, 2013
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Dec 11, 2012
filing date -
Dec 29, 2008
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Abstract
Disclosed are catalyst compositions having an external electron donor which includes one or more of the following compositions: a phosphite, a phosphonite, a pyrophosphite, and/or a diphosphazane. Ziegler-Natta catalyst compositions containing the present external electron donor exhibit strong activity and produce propylene-based olefins with high isotacticity and high melt flow rate.
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