Catalyst composition comprising fluorided support and processes for use thereof
First Claim
1. A catalyst system comprising the reaction product of fluorided silica support, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene is a biscyclopentadienyl group 4 transition metal compound where the fluorided silica support has not been calcined at a temperature of 100°
- C. to less than 400°
C., wherein said fluorided silica support is (a) fluorided by combining the silica support with a fluoride compound in a polar solvent and (b) free of residual fluoride compound.
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Abstract
This invention relates to a catalyst system comprising fluorided silica, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene is a biscyclopentadientyl group 4 transition metal compound, where the fluorided support has not been calcined at a temperature of 400° C. or more, and is preferably produced using a west mixing method, such as an aqueous method.
70 Citations
24 Claims
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1. A catalyst system comprising the reaction product of fluorided silica support, alkylalumoxane activator and at least two metallocene catalyst compounds, where the first metallocene is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene is a biscyclopentadienyl group 4 transition metal compound where the fluorided silica support has not been calcined at a temperature of 100°
- C. to less than 400°
C., wherein said fluorided silica support is (a) fluorided by combining the silica support with a fluoride compound in a polar solvent and (b) free of residual fluoride compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- C. to less than 400°
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11. A process to produce ethylene polymer comprising:
- i) contacting, in the gas phase or slurry phase, ethylene and, optionally C3 to C20 comonomer, with a catalyst system comprising a fluorided silica support, an alkylalumoxane activator, and at least two metallocene catalyst compounds, where the first metallocene is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene is a biscyclopentadientyl group 4 transition metal compound, where the fluorided support has not been calcined at a temperature of 100°
C. to less than 400°
C., wherein said fluorided silica support is (a) fluorided by combining the silica support with a fluoride compound in a polar solvent and (b) free of residual fluoride compound, and ii) obtaining an ethylene polymer comprising at least 50 mol % ethylene. - View Dependent Claims (12, 13, 19, 20, 21, 22, 23, 24)
- i) contacting, in the gas phase or slurry phase, ethylene and, optionally C3 to C20 comonomer, with a catalyst system comprising a fluorided silica support, an alkylalumoxane activator, and at least two metallocene catalyst compounds, where the first metallocene is a bridged monocyclopentadienyl group 4 transition metal compound and the second metallocene is a biscyclopentadientyl group 4 transition metal compound, where the fluorided support has not been calcined at a temperature of 100°
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14. A method of preparing fluorided silica supported catalyst systems comprising combining a fluoride compound with a polar solvent to produce a fluorided silica support free of residual fluoride compound, then combining with a slurry of non-polar solvent and the fluorided silica support, removing the non-polar solvent, thereafter combining the calcined support with a second solvent, which is optionally the same as or different from the non-polar solvent, and two catalyst compounds and activator, wherein the fluorided support is calcined at a temperature from 100 to less than 400°
- C., before or after combination with the activator and/or catalyst compounds.
- View Dependent Claims (15, 16, 17, 18)
Specification