Ethylene/alpha-olefin copolymer

摘要

The present invention provides an ethylene/ alpha -olefin copolymer comprising constituent units (a) derived from ethylene and constituent units (b) derived from an alpha -olefin having 3 to 20 carbon atoms, the ethylene copolymer being characterized in that (A) the ethylene/ alpha -olefin copolymer has a density (d) of 0.88 to 0.95 g/cm3; (B) the ethylene/ alpha -olefin copolymer has a MFR of 0.01 to 200 g/10 min as measured at a temperature of 190 DEG C. and a load of 2.16 kg; (C) the temperature (Tm) at which the exothermic curve of the ethylene/ alpha -olefin copolymer measured by a differential scanning calorimeter (DSC) shows the highest peak and the density (d) satisfy the relation Tm<400d-250; (D) the quantity fraction (W) of a n-decane-soluble component at room temperature satisfy the relation, in the case of MFR/=10 g/10 min., W<80x(MFR-9)0.35xexp (-100(d-0.88))+0.1; (E) the flow index (FI) defined by a shear rate which is given when a shear stress of molten copolymer at 190 DEG C. reaches 2.4x106 dyne/cm2 satisfy the relation, FI>75xMFR; and (F) the melt tension (MT) at 190 DEG C. and MFR of the copolymer satisfy the relation, 3.98xMFR-0.66>MT>2xMFR-0.65.