Patent ID: 8273449

Claim:
A polyethylene film comprising: at least one heterogeneously branched ethylene/α-olefin copolymer, wherein said heterogeneously branched ethylene/α-olefin copolymer was obtained via polymerization of ethylene and one or more α-olefins in the presence of a multi-constituent catalyst system in a single reactor, wherein said multi-constituent catalyst system comprises a magnesium and titanium containing pro-catalyst and a cocatalyst, wherein said cocatalyst is a modified alkyl aluminum compound, wherein said heterogeneously branched ethylene/α-olefin copolymer having a density in the range of about 0.910 to about 0.930 g/cm 3 , a molecular weight distribution in the range of about 2.8 to 3.8, a melt index (I 2 ) in the range of about 0.3 to about 4 g/10 min, and an I 10 /I 2 ratio in the range of 6.5 to about 7.8; wherein said film having a normalized dart impact strength of equal or greater than (6666-7012*density) g/mil, a normalized tear strength of equal or greater than ( 440 * ⅇ - ( density - 0.915 ) 2 2 * ( 0.00949 ) 2 ) g/mil, and a haze in the range of 3 to 10 percent.