Polymers with improved ESCR for blow molding applications
AssigneeChevron Phillips Chemical Company LP
InventorsVivek Rohatgi, Jeffrey F. Greco, Yongwoo Inn, Qing Yang, Alfred E. Brown, Jr.
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Abstract
Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. These polymers have the processability of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.
Claims27
An ethylene polymer comprising a higher molecular weight component and a lower molecular weight component, wherein the ethylene polymer has a density of greater than or equal to about 0.95 g/cm3, a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min, a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175, a bimodal molecular weight distribution, less than about 0.008 long chain branches per 1000 total carbon atoms, a non-conventional comonomer distribution, and a slope of a plot of the viscosity (Pa-sec) versus shear rate (sec−1) at 190° C. of the ethylene polymer at 100 sec−1 in a range from about 0.42 to about 0.65.
An ethylene polymer comprising a higher molecular weight component and a lower molecular weight component, wherein the ethylene polymer has a density of greater than or equal to about 0.95 g/cm3, a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min, a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175, a peak molecular weight (Mp) of the higher molecular weight component in a range from about 650,000 to about 1,100,000 g/mol, a Mp of the lower molecular weight component in a range from about 40,000 to about 80,000 g/mol, less than about 0.008 long chain branches per 1000 total carbon atoms, a non-conventional comonomer distribution, and a ratio of Mw/Mn in a range from about 5 to about 18.
An ethylene polymer comprising a higher molecular weight component and a lower molecular weight component, wherein the ethylene polymer has a density of greater than or equal to about 0.95 g/cm3, a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min, a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175, and a slope of a plot of the viscosity (Pa-sec) versus shear rate (sec−1) at 190° C. of the ethylene polymer at 100 sec−1 in a range from about 0.42 to about 0.65, and wherein the lower molecular weight component has a ratio of Mz/Mw in a range from about 1.5 to about 2.8.
An ethylene polymer comprising a higher molecular weight component and a lower molecular weight component, wherein the ethylene polymer has a density of greater than or equal to about 0.95 g/cm3, a melt index (MI) in a range from about 0.05 to about 1.5 g/10 min, a ratio of high load melt index to melt index (HLMI/MI) in a range from about 40 to about 175, a peak molecular weight (Mp) of the higher molecular weight component in a range from about 650,000 to about 1,100,000 g/mol, a Mp of the lower molecular weight component in a range from about 40,000 to about 80,000 g/mol, a ratio of Mz/Mw of the lower molecular weight component in a range from about 1.5 to about 2.8, and a ratio of Mw/Mn in a range from about 5 to about 18.
Dependencies are inferred from the claim text.