Processes for preparing metallocene-based catalyst systems for the control of long chain branch content
AssigneeChevron Phillips Chemical Company LP
InventorsQing Yang, Max P. McDaniel, Tony R. Crain
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Abstract
Methods for preparing a metallocene-based catalyst composition that can impact the long chain branching of ethylene homopolymers and copolymers produced using the catalyst composition are described. The catalyst composition can be prepared by contacting a metallocene compound, a hydrocarbon solvent, and a first organoaluminum compound for a first period of time to form a metallocene solution, and then contacting the metallocene solution with an activator-support and a second organoaluminum compound for a second period of time to form the catalyst composition.
Claims21
A process to produce a catalyst composition, the process comprising:
- (a) contacting a metallocene compound, a hydrocarbon solvent, and a first organoaluminum compound for a first period of time to form a metallocene solution;
- and
- (b) contacting the metallocene solution with an activator-support and a second organoaluminum compound for a second period of time to form the catalyst composition,
- wherein:
- the first organoaluminum compound comprises triisobutylaluminum and/or tri-n-octylaluminum;
- the second organoaluminum compound comprises trimethylaluminum, triethylaluminum, tri-n-propylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-n-hexylaluminum, tri-n-octylaluminum, diisobutylaluminum hydride, diethylaluminum ethoxide, diethylaluminum chloride, or any combination thereof;
- and
- the first organoaluminum compound and the second organoaluminum compound are different.
A process to produce a catalyst composition, the process comprising:
- (a) contacting a metallocene compound, a hydrocarbon solvent, and a first organoaluminum compound for a first period of time to form a metallocene solution;
- and
- (b) contacting the metallocene solution with an activator-support and a second organoaluminum compound for a second period of time to form the catalyst composition,
- wherein:
- the metallocene compound comprises rac-ethylene-bis(indenyl) zirconium dichloride;
- the hydrocarbon solvent comprises an olefin solvent and/or an alkane solvent;
- and
- the first organoaluminum compound comprises triisobutylaluminum.
A process to produce a catalyst composition, the process comprising:
- (a) contacting a metallocene compound, a hydrocarbon solvent, and a first organoaluminum compound for a first period of time to form a metallocene solution;
- and
- (b) contacting the metallocene solution with an activator-support and a second organoaluminum compound for a second period of time to form the catalyst composition,
- wherein:
- the metallocene compound comprises rac-ethylene-bis(indenyl) zirconium dichloride;
- the hydrocarbon solvent comprises an aromatic solvent and/or an alkane solvent;
- and
- the first organoaluminum compound comprises trioctylaluminum.
A process to produce a catalyst composition, the process comprising:
- (a) contacting a metallocene compound, a hydrocarbon solvent, and a first organoaluminum compound for a first period of time to form a metallocene solution;
- and
- (b) contacting the metallocene solution with an activator-support and a second organoaluminum compound for a second period of time to form the catalyst composition,
- wherein:
- the metallocene compound comprises methyl(buten-3-yl)methylidene(η5-cyclopentadienyl)(η5-2,7-di-tert-butylfluoren-9-ylidene) zirconium dichloride;
- the hydrocarbon solvent comprises an aromatic solvent;
- and
- the first organoaluminum compound comprises triisobutylaluminum.
Dependencies are inferred from the claim text.