Metallocene Catalyst Systems With Chemically-Treated Solid Oxides For Producing Ethylene-Based Plastomers And Elastomers
AssigneeChevron Phillips Chemical Company LP
InventorsScott E. Kufeld, Max P. McDaniel, Kenneth A. Dooley
Life of this patent
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Abstract
Polymerization processes for producing ethylene-based plastomers and elastomers having densities less than 0.91 g/cm3 utilize a metallocene-based catalyst system containing a chemically-treated solid oxide. These polymerization processes can be conducted in a slurry reactor, a solution reactor, and/or a gas phase reactor. Ethylene polymers produced from the polymerization process can be characterized by a density of less than 0.91 g/cm3, a CY-a parameter of less than 0.2, and a ratio of HLMI/MI of at least 30, or a density less than 0.91 g/cm3, a CY-a parameter from 0.25 to 0.75, and a ratio of Mw/Mn from 2 to 3.
Claims26
1-5. (canceled)
A solution polymerization process for producing an ethylene polymer having a density of less than or equal to about 0.91 g/cm3, the process comprising:
- contacting a catalyst composition with ethylene and an α-olefin comonomer in a hydrocarbon solvent in a solution reactor at a polymerization temperature in a range from about 120° C. to about 160° C. to produce the ethylene polymer;
- wherein the catalyst composition comprises a metallocene compound, a chemically-treated solid oxide, and optionally, a co-catalyst;
- and
- wherein the metallocene compound is characterized by a comonomer incorporation efficiency of at least about 10% at the polymerization temperature.
11-20. (canceled)
Dependencies are inferred from the claim text.