Patent ID: 8507103

Claim:
A process to produce blown film comprising: 1) selecting a copolymer comprising ethylene and from 0.5 to 25 mol % of C 3 to C 20 olefin comonomer, said copolymer having: i) a ratio of Ultimate Tensile Stress to Tensile Stress at 100% elongation of 2.4 or more; ii) a ratio of Ultimate Tensile Stress to Tensile Stress at 300% elongation of 2.5 or more; iii) a ratio of Ultimate Tensile Stress to Tensile Stress at the primary yield point of 2.9 or more; iv) a density of 0.910 g/cm 3 or more; v) a 1% secant modulus of 40 to 100 MPa; vi) a Tensile Stress of Y MPa or more, where Y=(0.0532)*Z−8.6733 and Z is the percent strain and is a number from 500 to 2000; and vii) a melt index (2.16 kg, 190° C.) of 0.8 dg/min or less, and 2) converting the copolymer into film using a blown film process, where the production rate is 3.0 kg/hr/cm or less, the thickness is 12.7 to 200 microns, the Total Draw is 60 to 110 (ratio of the final thickness of the film to the width of the die gap used in making the film), and the blow up ratio is 3.0 or less.