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US 6,552,137 B1Granted
Catalyst system and its use in olefin polymerization
AssigneeUnivation Technologies, LLC
InventorsSun-Chueh Kao, Jaimes Sher, Frederick J. Karol
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Abstract
A polymerization catalyst system and a method for preparing the catalyst system is disclosed. The catalyst system includes a bulky ligand metallocene catalyst compound, preferably containing a single cyclopentadienyl or substituted cyclopentadienyl-type ring system, a Group 13 element containing first modifier, and a cycloalkadiene second modifier. The present invention also provides a process for polymerizing olefin(s) utilizing the catalyst systems described herein.
Claims18
A process for polymerization olefin(s) in the presence of a catalyst system, the catalyst system comprising:
- a) a bulky ligand metallocene catalyst compound;
- b) a first modifier comprising a Group 13 element containing compound;
- wherein the first modifier is represented by:
- (L′—H)d+(Ad−)
- where L′ is an neutral Lewis base;
- H is hydrogen;
- (L′—H)+ is a Bronsted acid;
- Ad− is a non-coordinating anion having the charge d—;
- and
- d is an integer from 1 to 3;
- or a boron containing compound;
- c) a second modifier comprising a cycloalkadiene;
- and
- d) an activator compound selected from the group consisting of methylalumoxane, modified methylalumoxane and combinations thereof.
11 more elements
Dependencies are inferred from the claim text.