| 摘要 |
An ethylene-alpha-olefin copolymer having monomer units derived from ethylene and monomer units derived from an alpha-olefin of 3 to 20 carbon atoms, a melt flow rate (MFR) of 0.01 to 4 g/10 minutes, a density of 890 to 970 kg/m<SUP>3</SUP>, an activation energy of flow of 50 kJ/mol or more and a molecular weight distribution measured by gel permeation chromatography of 3 or more, wherein a characteristic relaxation time (tau) determined by a melt viscoelasticity measurement or an external haze ratio (EHR) satisfies a relationship of the following formula (1) or (2), respectively: <?in-line-formulae description="In-line Formulae" end="lead"?>3xMFR<SUP>-0.75</SUP>+1.1>tau>1.3xMFR<SUP>-0.5</SUP>+1.4 (1) <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>EHR<=-15xLOGMFR+0.145xd-47 (2) <?in-line-formulae description="In-line Formulae" end="tail"?>
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