Gas phase olefin polymerizations using dual donor catalyst systems
OwnerJerome A. Streeky, David A. Kreider +2inventors
InventorsJerome A. Streeky, David A. Kreider, Chi-Hung Lin, Mark G. Reichmann
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Abstract
A gas-phase olefin polymerization process in a plug flow reactor uses a catalyst system containing a magnesium halide supported titanium-containing component, an organoaluminum component, and at least one external electron donor component; in the process a first external donor component is added to the reactor at an injection point axially near an injection point for the supported transition metal containing component, and at least a second external donor component is added to the reactor axially downstream from the injection point for the first external donor component.
Claims20
A gas-phase process for polymerization of olefins in a plug flow reactor, in which at least one olefin monomer is contacted with a catalyst system comprising a magnesium halide supported titanium-containing component, an organoaluminum component, and at least one external electron donor component in which catalyst system components are added through injection points positioned axially along the reactor, comprising:
- adding a first external donor component to the reactor at an injection point axially near an injection point for the supported transition metal containing component, and
- adding at least a second external donor component to the reactor axially downstream from the injection point for the first external donor component.
A gas-phase process for polymerization of olefins in a cylindrical horizontal, subfluidized stirred-bed plug flow reactor, in which at least one olefin monomer is contacted with a catalyst system comprising a magnesium halide supported titanium-containing component, an organoaluminum component, and at least one external silicon-containing electron donor component in which the catalyst system components are added through injection points positioned axially along the reactor, comprising:
- adding a first external donor component to the reactor at an injection point axially near an injection point for the supported transition metal containing component, and
- adding at least a second external donor component, which is more stereoregulating than the first electron donor, to the reactor at least 25% of the length of the reactor axially downstream from the injection point for the first external donor component.
Dependencies are inferred from the claim text.