Self-limiting catalyst system with controlled aluminum to SCA ratio and method
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United States of America Patent
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May 12, 2020
Grant Date -
Jun 23, 2011
app pub date -
Aug 21, 2008
filing date -
Aug 24, 2007
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Abstract
A catalyst composition for the polymerization of propylene is provided. The catalyst composition includes one or more Ziegler-Natta procatalyst compositions having one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors, one or more aluminum containing cocatalysts and a selectivity control agent (SCA). The SCA is a mixture of an activity limiting agent and a silane composition. The catalyst composition has a molar ratio of aluminum to total SCA from 0.5:1 to 4:1. This aluminum/SCA ratio improves polymerization productivity and the polymer production rate. The catalyst composition is self-extinguishing.
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