Patent ID: 8436101

Claim:
An ethylene-α-olefin copolymer having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, which has a melt flow rate (MFR) of 0.1 to 100 g/10 min, a density (d) of 850 to 940 kg/m 3 , a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 2 to 12, and a value g* defined by the following formula (I) of 0.50 to 0.75: g *=[η]/([η] GPC ×g SCB *) (I), wherein [η] stands for intrinsic viscosity (unit: dl/g) of the ethylene-α-olefin copolymer and is defined by the following formula (I-I): [η]=23.3×log(ηrel) (I-I), wherein ηrel stands for relative viscosity of the ethylene-α-olefin copolymer, [η] GPC is defined by the following formula (I-II): [η] GPC =0.00046× Mv 0.725 (I-II), wherein Mv stands for viscosity average molecular weight of the ethylene-α-olefin copolymer, and g SCB * is defined by the following formula (I-III): g SCB *=(1− A ) 1.725 (I-III), wherein A can be obtained directly by measuring short chain branch content in the ethylene-α-olefin copolymer.