Patent ID: 8293348

Claim:
A multilayer laminate film comprising a seal layer (A) and a base material layer (B), wherein: the seal layer (A) comprises a mixture of 10-50 parts by weight of high-density polyethylene and 50-90 parts by weight of polypropylene; the base material layer (B) comprises one member selected from the group consisting of (a) an ethylene/butene copolymer with a density of 0.93 g/cm 3 -0.94 g/cm 3 , polymerized using a multisite catalyst, (b) high-density polyethylene with a density of 0.945 g/cm 3 -0.965 g/cm 3 and (c) an ethylene/propylene block or random copolymer, wherein each of said ethylene/butene copolymer, said high-density polyethylene and said ethylene/propylene block or random copolymer has a flexural modulus of 300 MPa or greater as a numerical value obtained by the method according to JIS K 7171; the base material layer (B) is laminated on the seal layer (A) in one or more layers; and the layer thickness of the seal layer (A) is 1 μm-20 μm while the layer thickness of the base material layer (B) is 20 μm-100 μm.