Dual catalyst systems for producing polymers with a broad molecular weight distribution and a uniform short chain branch distribution
AssigneeChevron Phillips Chemical Company LP
InventorsQing Yang, Jeff F. Greco, Max P. McDaniel, Youlu Yu, Gary L. Glass, Tony R. Crain
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Abstract
Disclosed herein are ethylene-based polymers having a melt index less than 50 g/10 min, a ratio of Mw/Mn from 4 to 20, a density from 0.90 to 0.945 g/cm3, and a substantially constant short chain branch distribution. These polymers can be produced using a dual catalyst system containing a boron bridged metallocene compound with a cyclopentadienyl group and an indenyl group, and a single atom bridged metallocene compound with a fluorenyl group.
Claims24
An olefin polymer having a melt index of less than or equal to about 50 g/10 min, a ratio of Mw/Mn in a range from about 4 to about 20, a density in a range from about 0.90 g/cm3 to about 0.945 g/cm3, and a percentage of data points deviating from the average short chain branch content, determined over the range from D15 to D85, by greater than 1 short chain branch per 1000 total carbon atoms of less than or equal to about 10%.
An ethylene copolymer having a melt index of less than or equal to about 50 g/10 min, a ratio of Mw/Mn in a range from about 4 to about 20, a density in a range from about 0.90 g/cm3 to about 0.945 g/cm3, and a percentage of data points deviating from the average short chain branch content, determined over the range from D15 to D85, by greater than 0.5 short chain branches per 1000 total carbon atoms of less than or equal to about 15%.
An ethylene copolymer having a melt index of less than or equal to about 50 g/10 min, a ratio of Mw/Mn in a range from about 4 to about 20, a density in a range from about 0.90 g/cm3 to about 0.945 g/cm3, and a slope of a plot of the number of short chain branches per 1000 total carbon atoms versus the logarithm of molecular weight of the copolymer, determined via linear regression over the range from D15 to D85, in a range from about −0.6 to about 0.6.
Dependencies are inferred from the claim text.