Patent ID: 7339019
Filing Date: 2008-03-04
Classification: C08F

Abstract:
1. An ethylene-α-olefin copolymer having monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/m 3 , an activation energy of flow of 50 kJ/mol or more and a molecular weight distribution defined as a ratio of weight average molecular weight to number average molecular weight of 5 or more, wherein said copolymer has a melt complex viscosity (η, unit: Pa·sec) measured at a temperature of 190° C. and angular frequency of 100 rad/second and a melt flow rate measured at 190° C. under a load of 21.18 N according to JIS K7210-1995(MFR, unit: g/10 minutes) that satisfy the following formula (1), the melt flow rate and a characteristic relaxation time (t, unit: second) that satisfy the following formula (2), the melt flow rate and a melt tension (MT, unit: cN) that satisfy the following formula (5″), and the melt flow rate and an intrinsic viscosity ([η], unit: dL/g) that satisfy the following formula (6″):