Patent ID: 7335715
Filing Date: 2008-02-26
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 (d) of 906 to 970 kg/m 3 , wherein an activation energy (Ea) of flow is 50 kJ/mol or more, a quantity of heat of fusion of a cold xylene soluble part contained in the copolymer is 30 J/g or more, a molecular weight distribution defined as a ratio of weight average molecular weight to number average molecular weight of 5 or more, and a melt flow rate measured at 190° C. under a load of 21.18 N according to JIS K7210-1995 (MFR: unit is g/10 minutes), the density (d), a weight fraction of the cold xylene soluble part (CXS: unit; % by weight), a characteristic relaxation time (t, unit is second), a melt tension (MT: unit cN) and an intrinsic viscosity ([η], unit: dL/g) satisfy relations of the following formulas (1), (2), (5″) and (6″):