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US 2019/0169332 A1Published application
Silica-Coated Alumina Activator-Supports For Metallocene Catalyst Compositions
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Qing Yang, Randy S. Muninger, Elizabeth A. Benham, Kathy S. Clear
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Abstract
Silica-coated alumina activator-supports, and catalyst compositions containing these activator-supports, are disclosed. Methods also are provided for preparing silica-coated alumina activator-supports, for preparing catalyst compositions, and for using the catalyst compositions to polymerize olefins.
Claims24
1-20. (canceled)
An activator-support comprising a silica-coated alumina treated with an electron-withdrawing anion, wherein:
- the silica-coated alumina has a weight ratio of alumina to silica in a range from about 1:1 to about 2:1;
- and
- the electron-withdrawing anion comprises fluoride.
A process for preparing an activator-support, the process comprising:
- contacting a silica-coated alumina with a fluoriding agent to form the activator-support;
- wherein the silica-coated alumina has a weight ratio of alumina to silica in a range from about 1:1 to about 2:1;
- and
- wherein the activator-support contains from about 2 to about 15 wt. % fluoride.
1 more element
Dependencies are inferred from the claim text.