Bimodal resins having good film processability
AssigneeChevron Phillips Chemical Company LP
InventorsGuylaine St. Jean, Qing Yang, J. Todd Lanier
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Abstract
A bimodal polyethylene copolymer comprising a lower molecular weight (LMW) component and a higher molecular weight (HMW) component, the copolymer having a z-average molecular weight (Mz) of from about 1,000 kg/mol to about 2,500 kg/mol, a weight fraction of the LMW component (LMW fr.) of from about 0.60 to 0.85, a ratio of a weight average molecular weight (Mw) of the HMW component (HMW Mw) to a Mw of the LMW component (LMW Mw) of from about 14 to about 25, a zero shear viscosity (η0) of from about 5×105 Pa-s to about 1×107 Pa-s and a HMW Mw of from about 800 kg/mol to about 1,500 kg/mol.
Claims21
A bimodal polyethylene copolymer comprising a lower molecular weight (LMW) component and a higher molecular weight (HMW) component, the copolymer having a z-average molecular weight (Mz) of from about 1,000 kg/mol to about 2,500 kg/mol, a weight fraction of the LMW component (LMW fr.) of from about 0.60 to 0.85, a ratio of a weight average molecular weight (Mw) of the HMW component (HMW Mw) to a Mw of the LMW component (LMW Mw) of from about 14 to about 25, a zero shear viscosity (η0) of from about 5×105 Pa-s to about 1×107 Pa-s and a HMW Mw of from about 800 kg/mol to about 1,500 kg/mol, wherein the copolymer is prepared using a residence time in a polymerization reactor of equal to or greater than about 30 minutes.
Dependencies are inferred from the claim text.