Biomodal polymerization catalysts
AssigneeUnivation Technologies, LLC
InventorsCliff R. Mure, Timothy R. Lynn
Life of this patent
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Abstract
Embodiments of the present disclosure directed towards bimodal polymerization catalysts. As an example, the present disclosure provides a bimodal polymerization catalyst system including a non-metallocene olefin polymerization catalyst and a zirconocene catalyst of Formula I: (Formula I) where each of R1, R2, and R4 are independently a C1 to C20 alkyl, aryl or aralkyl group or a hydrogen, where R3 is a C1 to C20 alkyl, aryl or aralkyl group, and where each X is independently a halide, C1 to C20 alkyl, aralkyl group or hydrogen.
Claims9
A bimodal polymerization catalyst system comprising:
- a non-metallocene olefin polymerization catalyst;
- and
- a zirconocene catalyst of Formula I:
- where R4 is independently a C1 alkyl or a hydrogen, where R3 is a C1 to C20 alkyl, aryl or aralkyl group, where each X is independently a halide, C1 to C20 alkyl, aralkyl group or hydrogen;
- and
- where R1 and R2 of Formula I together, with the carbon atoms to which they are bonded, form a cycloalkyl group;
- or
- R1 is a C1 alkyl and R2 is a C3 alkyl.
A method of producing a bimodal polyethylene, the method comprising:
- polymerizing ethylene in a single reactor in presence of a bimodal polymerization catalyst system to form the bimodal polyethylene, wherein the bimodal polymerization catalyst system comprises:
- a non-metallocene olefin polymerization catalyst;
- and
- a zirconocene catalyst of Formula I:
- where R4 is independently a C1 alkyl or a hydrogen, where R3 is a C1 to C20 alkyl, aryl or aralkyl group, where each X is independently a halide, C1 to C20 alkyl, aralkyl group or hydrogen, and where:
- R1 and R2 of Formula I together, with the carbon atoms to which they are bonded, form a cycloalkyl group;
- or
- R1 is a C1 alkyl and R2 is a C3 alkyl.
A bimodal polymerization catalyst system comprising:
- a non-metallocene olefin polymerization catalyst;
- and
- a zirconocene catalyst of Formula I:
- wherein R1 is a C1 alkyl, R2 is a C3 alkyl, R4 is a C1 alkyl, R3 is a C1 to C20 alkyl, aryl or aralkyl group, and each X is independently a halide, C1 to C20 alkyl, aralkyl group or hydrogen.
Dependencies are inferred from the claim text.