Patent ID: 8029885

Claim:
A multi-layer film comprising: a surface layer having a thickness of 10 to 50 μm made of an ethylene-α-olefin copolymer having a density of 0.935 to 0.950 g/cm 3 , a flexible layer having a thickness of 100 to 200 μm made of an ethylene-α-olefin copolymer having a density of 0.860 to 0.930 g/cm 3 , a barrier layer having a thickness of 10 to 80 μm made of a mixed resin containing (a) 60 to 95% by weight of a cyclic olefin polymer and (b) 5 to 40% by weight of an ethylene-α-olefin copolymer having a density of 0.900 to 0.965 g/cm 3 , wherein the α-olefin is selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-ocetene, 1-nonene, 1-decene, 1-undecene and 1-dodecene and a seal layer having a thickness of 5 to 80 μm made of an ethylene-α-olefin copolymer having a density of 0.910 to 0.950 g/cm 3 .