Patent ID: 8486323

Claim:
A rotational molded article comprising: a polyethylene composition comprising; at least 85 percent by weight of the units derived from ethylene; less than 15 percent by weight of units derived from one or more α-olefin comonomers; wherein said polyethylene composition has a density in the range of 0.930 to 0.945 g/cm 3 , a molecular weight distribution (M W /M n ) in the range of 1.70 to 3.50, a melt index (I 2 ) in the range of 0.5 to 20 g/10 minutes, a molecular weight distribution (M z /M w ) in the range of less than 2.5, vinyl unsaturation of less than 0.06 vinyls per one thousand carbon atoms present in the backbone of said composition, wherein said rotational molded article has an energy to maximum force normalized to thickness, measured at −20° C., greater than 10 J/mm as measured by the ISO 6603-2 Instrumented Impact testing method.