Patent ID: 7625982

Claim:
A multimodal polyethylene composition having at least a first polyethylene component and a second polyethylene component, wherein: (a) the first polyethylene component and the second polyethylene component have a molecular weight distribution of equal to or less than 5; (b) the first polyethylene component has a higher molecular weight than the second polyethylene component; (c) the first polyethylene component has an “a” parameter value of equal to or greater than about 0.35 when fitted to the Carreau-Yasuda equation with n=0; (d) the ratio of the weight average molecular weight of the first polyethylene component to the weight average molecular weight of the second polyethylene component is between 9 and 20; (e) the S4 critical temperature of the composition is less than about −20° C.; (f) the density of the composition is from about 0.920 g/cc to about 0.965 g/cc; (g) the first polyethylene component comprises a copolymer of ethylene and 1-olefin and the second polyethylene component comprises a copolymer of ethylene and 1-olefin, and wherein the 1-olefin in the first polyethylene component and the second polyethylene component may be the same or different; (h) the polydispersity of the composition is from about 3.0 to about 30; and (i) the high load melt index of the composition is equal to or less than about 30 g/10 min.