Bimodal polyethylene resins
AssigneeUnivation Technologies, LLC
InventorsPeter S. Martin, John F. Szul, Roger L. Kuhlman, Mahsa McDougal, C. Jeff Harlan, Timothy M. Boller
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Abstract
A high density, high polydispersity polyethylene having improved properties, and a process of producing same.
Claims11
An ethylene-based polymer comprising a higher molecular weight component (HMW component) and a lower molecular weight component (LMW component), the ethylene-based polymer being characterized by a density greater than or equal to 0.949 g/cm3, measured according to ASTM D792, a ratio of Mw/Mn of from 25 to 35, an ESCR of at least 600 hr. measured according to ASTM D-1693, Condition B (Igepal 10%), and by a bimodal weight average molecular weight distribution with a local minimum in a range of log (molecular weight) 4 to 6 between a peak representing the HMW component and a peak representing the LMW component, as determined by Gel Permeation Chromatography (GPC) analysis, of the ethylene-based polymer.
A composition comprising bis(2-pentamethylphenylamido)ethyl)zirconium dibenzyl, and at least one of (methylcyclopentadienyl)(1-methyl-tetrahydroindenyl)zirconium dimethyl and (propylcyclopentadienyl)(1,3-dimethyl-tetrahydroindenyl)zirconium dimethyl.
A process for copolymerizing ethylene and one or more alpha-olefins in a single olefin polymerization reactor utilizing a catalyst system, an activator and a support in order to produce an ethylene-based polymer, the process comprising combining ethylene and at least one alpha-olefin comonomer in the presence of a catalyst system, an activator and a support, wherein the catalyst system comprises a main catalyst and a trim catalyst, wherein the main catalyst comprises bis(2-pentamethylphenylamido)ethyl)zirconium dibenzyl, and wherein the trim catalyst comprises at least one of (propylcyclopentadienyl)(1,3-dimethyl-tetrahydroindenyl)zirconium dimethyl and (methylcyclopentadienyl)(1-methyl-tetrahydroindenyl)zirconium dimethyl.
Dependencies are inferred from the claim text.