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US 10,961,331 B2Granted
Ethylene homopolymers with a reverse short chain branch distribution
AssigneeChevron Phillips Chemical Company LP
InventorsBrooke L. Small, Max P. McDaniel, Matthew F. Milner, Paul J. DesLauriers
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Abstract
Disclosed herein are ethylene homopolymers generally characterized by a density of less than 0.94 g/cm3 and an inverse short chain branch distribution. These homopolymers can be further characterized by a ratio of Mw/Mn from 2 to 100, a number of short chain branches from 2 to 20 short chain branches per 1000 total carbon atoms, and wherein at least 50% of the short chain branches are methyl branches.
Claims20
An ethylene homopolymer having:
- a density of less than or equal to about 0.925 g/cm3;
- a number of short chain branches (SCB's) in a range from about 3 to about 15 SCB's per 1000 total carbon atoms;
- and
- a number of SCB's per 1000 total carbon atoms of the homopolymer at Mw that is greater than at Mn;
- wherein at least about 50% of the SCB's are methyl branches.
2 more elements
An ethylene homopolymer having:
- a density in a range from about 0.90 to about 0.925 g/cm3;
- a number of long chain branches (LCB's) per 1000 total carbon atoms in a range from about 0.3 to about 2;
- a number of SCB's per 1000 total carbon atoms of the homopolymer at Mw that is greater than at Mn;
- and
- a ratio of Mw/Mn in a range from about 2 to about 100;
- wherein at least about 50% of the SCB's are methyl branches.
3 more elements
A polymerization process comprising:
- contacting a catalyst composition with ethylene and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer, wherein:
- the catalyst composition comprises a nickel diimine complex, a metallocene compound, and an activator;
- and
- the ethylene polymer is characterized by:
- a density of less than or equal to about 0.925 g/cm3;
- a number of short chain branches (SCB's) in a range from about 3 to about 15 SCB's per 1000 total carbon atoms;
- and
- a number of SCB's per 1000 total carbon atoms of the polymer at Mw that is greater than at Mn;
- and
- wherein at least about 50% of the SCB's are methyl branches.
7 more elements
Dependencies are inferred from the claim text.