| 摘要 |
<p>An ethylene copolymer excellent in mechanical properties and moldability, which comprises 40 to 99 mol% ethylene units and 1 to 60 mol% C3-20 α-olefin units and in which the ratio (Mz/Mw) of the Z-average molecular weight (Mz) to the weight-average molecular weight (Mw) both determined by GPC is 10 to 30, that ratio (Mz/Mw) and the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) both determined by GPC satisfy the relationship (Mz/Mw)⊃(Mw/Mn), the intrinsic viscosity is 0.5 to 4 dl/g, the ratio of the melt viscosity (θ*0.01) as measured at 190 °C and a shear rate of 0.01 rad/sec to that (θ*8) as measured at 190 °C and a shear rate of 8 rad/sec satisfy the relationship (θ*0.01/θ*8) 0.843x(θ)+1.0, and the absolute value of the activation energy (Ea) with respect to melt viscoelasticity shift factor is 4x104 J/mol.K or lower.</p> |
