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US 8,940,842 B2Granted
Methods for controlling dual catalyst olefin polymerizations
AssigneeChevron Phillips Chemical Company LP
InventorsQing Yang, Tony R. Crain, Jerry T. Lanier, Jeff S. Fodor
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Abstract
Methods for controlling the weight ratio of a higher molecular weight component to a lower molecular weight component of an olefin polymer are disclosed. This weight ratio can be increased as polymerization reaction temperature and/or catalyst system residence time are increased.
Claims29
A polymerization process, the process comprising:
- (1) contacting a dual catalyst system with an olefin monomer and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer,
- wherein the olefin polymer comprises a higher molecular weight component and a lower molecular weight component,
- wherein the dual catalyst system comprises a first metallocene catalyst component and a second metallocene catalyst component, and
- wherein the polymerization conditions comprise a reaction temperature and a dual catalyst system residence time;
- and
- (2) controlling a weight ratio of the higher molecular weight component to the lower molecular weight component by adjusting the reaction temperature and/or the dual catalyst system residence time, wherein the weight ratio of the higher molecular weight component to the lower molecular weight component increases as the reaction temperature increases.
3 more elements
A method of controlling a weight ratio of a higher molecular weight component to a lower molecular weight component of an olefin polymer, the method comprising:
- (i) contacting a dual catalyst system with an olefin monomer and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce the olefin polymer,
- wherein the dual catalyst system comprises a first metallocene catalyst component and a second metallocene catalyst component, and
- wherein the polymerization conditions comprise a reaction temperature and a dual catalyst system residence time;
- and
- (ii) adjusting the reaction temperature and/or the dual catalyst system residence time to control the weight ratio of the higher molecular weight component to the lower molecular weight component, wherein the weight ratio of the higher molecular weight component to the lower molecular weight component increases as the reaction temperature increases.
2 more elements
A process for producing an olefin polymer with a target weight ratio of a higher molecular weight component to a lower molecular weight component, the process comprising:
- (a) contacting a dual catalyst system with an olefin monomer and an 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
- wherein the polymerization conditions comprise a reaction temperature and a dual catalyst system residence time;
- and
- (b) controlling the reaction temperature and/or the dual reactor catalyst system residence time to produce the olefin polymer with the target weight ratio of the higher molecular weight component to the lower molecular weight component.
2 more elements
A polymerization process, the process comprising:
- (1) contacting a dual catalyst system with an olefin monomer and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer,
- wherein the olefin polymer comprises a higher molecular weight component and a lower molecular weight component,
- wherein the dual catalyst system comprises a first transition metal compound, a second transition metal compound, and an activator-support,
- wherein the activator-support comprises fluorided alumina, chlorided alumina, bromided alumina, sulfated alumina, fluorided silica-alumina, chlorided silica-alumina, bromided silica-alumina, sulfated silica-alumina, fluorided silica-zirconia, chlorided silica-zirconia, bromided silica-zirconia, sulfated silica-zirconia, fluorided silica-titania, fluorided silica-coated alumina, sulfated silica-coated alumina, phosphated silica-coated alumina, or any combination thereof, and
- wherein the polymerization conditions comprise a reaction temperature and a dual catalyst system residence time;
- and
- (2) controlling a weight ratio of the higher molecular weight component to the lower molecular weight component by adjusting the reaction temperature and/or the dual catalyst system residence time, wherein the weight ratio of the higher molecular weight component to the lower molecular weight component increases as the reaction temperature increases.
4 more elements
Dependencies are inferred from the claim text.