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US 9,163,098 B2Granted
Processes for preparing metallocene-based catalyst systems
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Qing Yang, Tony R. Crain
Life of this patent
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Abstract
Methods for preparing single and dual metallocene catalyst systems containing an activator-support are disclosed. These methods can include precontacting of the activator-support and an organoaluminum compound, as well as sequential contacting of two different metallocene compounds to form a dual metallocene catalyst system.
Claims22
A process to produce a catalyst composition, the process comprising:
- (i) contacting an activator-support and an organoaluminum compound for a first period of time to form a precontacted mixture;
- and
- (ii) contacting the precontacted mixture with a metallocene compound for a second period of time to form the catalyst composition;
- wherein:
- an activity of the catalyst composition is from about 15% to about 1000% greater than that of a catalyst system obtained by first combining the activator-support and the metallocene compound, and then combining the organoaluminum compound, under the same polymerization conditions.
2 more elements
An olefin polymerization process, the olefin polymerization process comprising:
- (i) contacting an activator-support and an organoaluminum compound for a first period of time to form a precontacted mixture;
- (ii) contacting the precontacted mixture with a metallocene compound for a second period of time to form the catalyst composition;
- and
- (iii) contacting the catalyst composition with an olefin monomer and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer;
- wherein:
- an activity of the catalyst composition is from about 15% to about 1000% greater than that of a catalyst system obtained by first combining the activator-support and the metallocene compound, and then combining the organoaluminum compound, under the same polymerization conditions.
3 more elements
Dependencies are inferred from the claim text.