Patent ID: 6894120

Claim:
A film formed from an ethylene copolymer composition comprising: (A-4) an ethylene-α-olefin copolymer of ethylene with an αolefin of 3 to 20 carbon atoms in an amount of 80 to 98% by weight, said copolymer having such properties that (i) the density (d) is in the range of 0.880 to 0.960 g/cm 3 , (ii) the melt flow rate (MFR) at 190° C. under a load of 2.16 kg determined in accordance with ASTM D1238-65T is in the range of 0.01 to 200 g/10 mm, (iii) the temperature (Tm (° C.)) at which the endothermic curve of said copolymer measured by a differential scanning calorimeter (DSC) shows the maximum peak and the density (d) satisfy the relation wherein the Tm is measured by heating a 5 g sample in an aluminum pan to 200° C. at a rate of 10° C./min, holding the sample at 200° C. for 5 minutes, lowering the temperature to room temperature at a rate of 20° C./min, and then heating at a rate of 10° C./min Tm <400 ×d −250, (iv) the melt tension (MT (g)) at 190° C. and the melt flow rate (MFR) satisfy the relation wherein MT is measured at an extrusion rate of 15 mm/min and a take-up rate of 10 to 20 m/min using a MT measuring apparatus having a nozzle diameter of 2.09 mmφ and a nozzle length of 8 mm MT 2.2 ×MFR −0.84 , and (v) the amount (W (% by weight)) of a decane-soluble portion at 23° C. and the density (d) satisfy the relation, in the case of MFR≦10 g/10 min, W ≦80×exp(−100( d −0.88))+0.1 in the case of MFR>10 g/10 min, W <80×( MFR −9) 0.26 ×exp(−100( d −0.88))+0.1; and (B-2) at least one crystalline polyolefin in an amount of 2 to 20% by weight, said crystalline polyolefin being selected from the group consisting of: (B-I) an ethylene homopolymer or a copolymer o ethylene with an α-olefin of 3 to 20 carbon atoms, prepared by using non-metallocene type catalyst, having a melt flow rate (MFR) of 0.01 to 100 g/10 min at 190° C. under a load of 2.16 kg and a density of not less than 0.950 g/cm 3 , (B-II) a propylene homopolymer or a copolymer of propylene with at least one olefin selected from an α-olefin of 4 to 20 carbon atoms, having a melt flow rate (MFR) of 0.1 to 100 g/10 min at 230° C. under a load of 2.16 kg and a density of not less than 0.900 g/cm 3 , and (B-III) a homopolymer of an α-olefin of 4 to 2 carbon atoms or a copolymer of α-olefins of 4 to 20 carbon toms, having a melt flow rate (MFR) of 0.1 to 100 g/10 min at 230° C. under a load of 2.16 kg and a density of not less than 0.900 g/cm 3 .