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US 10,239,975 B2Granted
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
Life of this patent
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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.
Claims23
A catalyst composition comprising:
- (a) a metallocene compound;
- and
- (b) 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 1.2:1 to about 25:1,
- the electron-withdrawing anion comprises chloride, bromide, phosphate, triflate, sulfate, or any combination thereof, and
- a catalyst activity of the catalyst composition comprising the activator-support is greater than that of a catalyst system containing a silica-alumina treated with the electron-withdrawing anion, under the same polymerization conditions.
3 more elements
A catalyst composition comprising:
- (a) a metallocene compound;
- (b) an activator-support comprising a silica-coated alumina treated with an electron-withdrawing anion;
- and
- (c) an organoaluminum compound comprising 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;
- wherein:
- the silica-coated alumina has a weight ratio of alumina to silica in a range from about 1.2:1 to about 25:1,
- the electron-withdrawing anion comprises chloride, bromide, phosphate, triflate, sulfate, or any combination thereof, and
- a catalyst activity of the catalyst composition comprising the activator-support is greater than that of a catalyst system containing a silica-alumina treated with the electron-withdrawing anion, under the same polymerization conditions.
5 more elements
A catalyst composition comprising:
- (a) a metallocene compound;
- and
- (b) 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 chloride, bromide, phosphate, triflate, sulfate, or any combination thereof.
2 more elements
Dependencies are inferred from the claim text.