Patent ID: 6458911
Filing Date: 2002-10-01
Classification: B01J,C08F,C08L

Abstract:
A film comprising a polymer blend, the blend having:a density of about 0.940 to 0.960 g/cc, a flow index (I21) of about 4 to 12 g/10 min, MFR of about 75 to 180 , and a dynamic elasticity of about 0.45 to 0.65 at a corresponding complex viscosity of about 6Ã—105 to 14Ã—105 poise, wherein the blend consists essentially of: at least about 0.5 weight fraction of a first component having a density of at least about 0.910 g/cc, a flow index (I21) of no higher than about 0.8 g/10 min, a molecular weight distribution indicated by a flow ratio (FR) no higher than about 15, and a dynamic elasticity at 0.1 rad/s, of no higher than about 0.75 at a corresponding complex viscosity at 0.1 rad/s of no higher than about 7Ã—106,and second component having a lower molecular weight than said first component and having a density of at least about 0.940 g/cc and a melt index (I2) of at least about 100 g/10 min, wherein each of said first component and said second component is selected from the group consisting of a homopolymer of ethylene and at least one copolymer of a preponderance of ethylene with a minor amount of a 1-olefin containing 3 to 10 carbon atoms as comonomer, said film exhibiting a Dart Drop Impact resistance (F50,ASTM d 1709) of 250 to 600 g.