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Methods for controlling dual catalyst olefin polymerizations with an organozinc compound

  • US 8,680,218 B1
  • Filed: 01/30/2013
  • Issued: 03/25/2014
  • Est. Priority Date: 01/30/2013
  • Status: Active Grant
First Claim
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1. A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising:

  • (i) contacting a dual catalyst system with an olefin monomer and an optional olefin comonomer in the polymerization reactor system under polymerization conditions to produce an olefin polymer,wherein the dual catalyst system comprises a first metallocene catalyst component and a second metallocene catalyst component; and

    (ii) introducing an amount of an organozinc compound into the polymerization reactor system to reduce a HLMI/MI shear ratio and/or to increase a Mz/Mw ratio of the olefin polymer.

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