Patent ID: 7125946

Claim:
A copolymer of ethylene and α-olefin of from 4 to 20 carbon atoms, having melt flow rate of from 2.0 to 100 g/10 min, an activation energy for melt flow of 60 kJ/mol or more, melt tension at 190° C. (MT), intrinsic viscosity ([η]) and a chain length A which satisfy the following formula (1) to (3), wherein the chain length A is a chain length at peak position of a logarithm normal distribution curve of a component having the highest molecular weight among logarithm normal distribution curves obtained by dividing a chain length distribution curve obtained by gel permeation chromatography measurement into at least two logarithm normal distribution curves: 2 ×MFR −0.59 <MT< 20 ×MFR −0.59 (1), 1.02 ×MFR −0.094 <[η]<1.50 ×MFR −0.156 (2), and log A≧− 0.0815×log( MFR )+4.05 (3).