Low density polyolefin resins and films made therefrom
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Ashish M. Sukhadia, Errun Ding, Chung Ching Tso, Albert P. Masino, Qing Yang, Lloyd W. Guatney, Guylaine St. Jean, Daniel G. Hert
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Abstract
Disclosed herein are broad molecular weight distribution olefin polymers having densities in the 0.895 to 0.930 g/cm3 range, and with improved impact and tear resistance. These polymers can have a ratio of Mw/Mn in the 8 to 35 range, a high load melt index in the 4 to 50 range, less than about 0.008 LCB per 1000 total carbon atoms, and a reverse comonomer distribution.
Claims26
An ethylene/α-olefin copolymer comprising a higher molecular weight component and a lower molecular weight component, wherein the copolymer has:
- a density in a range from about 0.895 to about 0.930 g/cm3;
- a ratio of Mw/Mn in a range from about 8 to about 35;
- a HLMI in a range from about 4 to about 50 g/10 min;
- a ratio of HLMI/MI in a range from about 50 to about 300;
- less than about 0.008 LCB per 1000 total carbon atoms;
- and
- a number of short chain branches per 1000 total carbon atoms at Mw that is greater than at Mn.
An article of manufacture comprising an ethylene/α-olefin copolymer, wherein the copolymer comprises a higher molecular weight component and a lower molecular weight component, and wherein the copolymer is characterized by:
- a density in a range from about 0.895 to about 0.930 g/cm3;
- a ratio of Mw/Mn in a range from about 8 to about 35;
- a HLMI in a range from about 4 to about 50 g/10 min;
- a ratio of HLMI/MI in a range from about 50 to about 300;
- less than about 0.008 LCB per 1000 total carbon atoms;
- and
- a number of short chain branches per 1000 total carbon atoms at Mw that is greater than at Mn.
A polymerization process, the process comprising:
- contacting a catalyst composition with an olefin monomer and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin copolymer, wherein the catalyst composition comprises a first metallocene compound, a second metallocene compound, an activator, and an optional co-catalyst, wherein the olefin copolymer is characterized by:
- a density in a range from about 0.895 to about 0.930 g/cm3;
- a ratio of Mw/Mn in a range from about 8 to about 35;
- a HLMI in a range from about 4 to about 50 g/10 min;
- a ratio of HLMI/MI in a range from about 50 to about 300;
- less than about 0.008 LCB per 1000 total carbon atoms;
- and
- a number of short chain branches per 1000 total carbon atoms at Mw that is greater than at Mn.
Dependencies are inferred from the claim text.