Methods for controlling dual catalyst olefin polymerizations with an organozinc compound
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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Abstract
Methods for controlling properties of an olefin polymer using an organozinc compound are disclosed. The HLMI/MI shear ratio of the polymer can be decreased and the Mz/Mw ratio of the polymer can be increased via the addition of the organozinc compound.
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Citations
20 Claims
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1. A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A process for producing an olefin polymer with a target HLMI/MI shear ratio and/or a target Mz/Mw ratio, the process comprising:
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(a) contacting a dual catalyst system with an olefin monomer and an optional olefin comonomer in a polymerization reactor system under polymerization conditions, wherein the dual catalyst system comprises a first metallocene catalyst component and a second metallocene catalyst component; and (b) controlling an amount of an organozinc compound introduced into the polymerization reactor system to produce the olefin polymer with the target HLMI/MI shear ratio and/or the target Mz/Mw ratio. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification