Patent ID: 8039554

Claim:
A resin composition comprising of an ethylene-α-olefin copolymer (A1) obtained by copolymerizing ethylene and an α-olefin in the presence of a metallocene catalyst and of an ethylene-α-olefin copolymer (B) obtained by copolymerizing ethylene with an α-olefin in the presence of a polymerization catalyst containing a solid component containing titanium, magnesium and a halogen, wherein the ethylene-α-olefin copolymer (A1) has monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a melt flow rate (MFR) of 0.01 to 1.3 g/10 minutes, a density of 910 to 970 kg/m 3 , an activation energy of flow of 50 kJ/mol or more and a molecular weight distribution measured by gel permeation chromatography of 7 to 25, wherein a characteristic relaxation time (τ, unit is second) determined by a melt viscoelasticity measurement and the MFR satisfy a relationship of the following formula (1): 3×MFR −0.75 +1.1>τ>1.3×MFR −0.5 +1.4 (1); wherein the ethylene-α-olefin copolymer (B) has a melt flow rate (MFR) of 0.1 to 10 g/10 minutes, a density (d) of 900 to 970 kg/m 3 , and an activation energy of flow of lower than 50 kJ/mol; and the content of copolymer (A1) is 1-70% by weight based on 100% by weight of the total of the copolymer (A1) and the copolymer (B); and wherein the copolymer (A1) includes 0.5 to 50 wt. % of said α-olefin.