Dual catalyst system for producing LLDPE copolymers with a narrow molecular weight distribution and improved processability
AssigneeChevron Phillips Chemical Company LP
InventorsMark L. Hlavinka, Chung Ching Tso, Yongwoo Inn, Deloris R. Gagan, Randy S. Muninger
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Abstract
Disclosed herein are ethylene-based polymers generally characterized by a Mw ranging from 70,000 to 200,000 g/mol, a ratio of Mz/Mw ranging from 1.8 to 20, an 1B parameter ranging from 0.92 to 1.05, and an ATREF profile characterized by one large peak. These polymers have the dart impact, tear strength, and optical properties of a metallocene-catalyzed LLDPE, but with improved processability, melt strength, and bubble stability, and can be used in blown film and other end-use applications.
Claims21
An ethylene polymer having:
- a Mw in a range from about 70,000 to about 200,000 g/mol;
- a ratio of Mz/Mw in a range from about 1.8 to about 20;
- an IB parameter in a range from about 0.92 to about 1.05;
- and
- a CY-a parameter in a range from about 0.2 to about 0.3.
A blown film comprising an ethylene polymer having:
- a Mw in a range from about 70,000 to about 200,000 g/mol;
- a ratio of Mz/Mw in a range from about 1.8 to about 20;
- and
- an IB parameter in a range from about 0.92 to about 1.05;
- wherein the film has a haze of less than or equal to about 6%.
An ethylene polymer having:
- a Mw in a range from about 70,000 to about 200,000 g/mol;
- a ratio of Mz/Mw in a range from about 1.8 to about 20;
- an IB parameter in a range from about 0.92 to about 1.05;
- and
- a density in a range from about 0.90 to about 0.93 g/cm3.
Dependencies are inferred from the claim text.