ETHYLENE COPOLYMER AND PROCESS FOR PRODUCING THE SAME, RESIN COMPOSITION CONTAINING THE COPOLYMER, AND USES OF THESE

摘要

An ethylene copolymer excellent in mechanical properties and moldability, which comprises 40 to 99 mol% ethylene units and 1 to 60 mol% C3-20 alpha -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 ( eta <*>0.01) as measured at 190 DEG C and a shear rate of 0.01 rad/sec to that ( eta <*>8) as measured at 190 DEG C and a shear rate of 8 rad/sec satisfy the relationship ( eta <*>0.01/ eta <*>8) 0.843x( eta )+1.0, and the absolute value of the activation energy (Ea) with respect to melt viscoelasticity shift factor is 4x10<4> J/mol.K or lower.