Reversible chain-transfer in polyolefin polymerization with pyridyldiamide catalysts
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United States of America Patent
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Feb 2, 2016
Grant Date -
Sep 11, 2014
app pub date -
Mar 3, 2014
filing date -
Mar 6, 2013
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Abstract
A process of producing ethylene α-olefin copolymers, especially ethylene block copolymers, comprising contacting ethylene and a C3 to C10 α-olefin with a transition metal pyridyldiamide (MPN3) catalyst component and an activator, as well as from 10 equivalents to 1000 equivalents relative to the catalyst component of chain transfer agent; isolating an ethylene-α-olefin copolymer having a Tm of less than 140° C., a MWD of less than 2.5, and a weight average molecular weight (Mw) within the range of from 5 kDa to 500 kDa. The chain transfer agent can be selected from Group 2, 12 or Group 13 alkyl or aryl compounds.
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