Back to results
US 2010/0076167 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. Collins
Life of this patent
Estimating the term…
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.
Claims20
A catalyst composition comprising:
- (a) at least one transition metal compound or metallocene compound;
- and
- (b) at least one activator-support;
- wherein the at least one activator-support comprises at least one silica-coated alumina treated with at least one electron-withdrawing anion, wherein:
- the at least one silica-coated alumina has a weight ratio of alumina to silica in a range from about 1:1 to about 100:1, and
- the at least one electron-withdrawing anion comprises fluoride, chloride, bromide, phosphate, triflate, bisulfate, sulfate, or any combination thereof.
3 more elements
An olefin polymerization process, the process comprising:
- contacting a catalyst composition with at least one olefin monomer and optionally at least one olefin comonomer under polymerization conditions to produce an olefin polymer, wherein the catalyst composition comprises at least one transition metal compound or metallocene compound, and at least one activator-support, wherein:
- the at least one activator-support comprises at least one silica-coated alumina treated with at least one electron-withdrawing anion, wherein:
- the at least one silica-coated alumina has a weight ratio of alumina to silica in a range from about 1:1 to about 100:1, and
- the at least one electron-withdrawing anion comprises fluoride, chloride, bromide, phosphate, triflate, bisulfate, sulfate, or any combination thereof.
1 more element
An activator-support comprising at least one silica-coated alumina treated with at least one electron-withdrawing anion, wherein:
- the at least one silica-coated alumina has a weight ratio of alumina to silica in a range from about 1:1 to about 100:1, and
- the at least one electron-withdrawing anion comprises chloride, bromide, phosphate, triflate, bisulfate, sulfate, fluoride and phosphate, fluoride and sulfate, chloride and phosphate, chloride and sulfate, triflate and sulfate, triflate and phosphate, or a combination thereof.
Dependencies are inferred from the claim text.