Unstretched Film, Multilayer Body And Package

Abstract: The present invention relates to an unstretched film, a multilayer body and a package; and the unstretched film comprises a base material layer and a sealant layer which is formed of a resin composition that contains 30 to 90% by mass of a propylene polymer (A) and 10 to 70% by mass of a 1-butene·a-olefin copolymer (B). The propylene polymer (A) contains 50 to 90% by mole of a constituent unit that is derived from propylene and has a melting point (Tm) of 120°C to 135°C as determined by differential scanning calorimetry (DSC). The copolymer (B) contains 50 to 99% by mole of a constituent unit that is derived from 1-butene and 1 to 50% by mole of a constituent unit that is derived from a-olefin (provided that the sum of the constituent unit derived from 1-butene and the constituent unit derived from a-olefin is 100% by mole), and has a melting point of less than 120°C or no measurable melting point as determined by DSC. The sealant layer has a thickness of 3 to 30 µm; and the base material layer has a thickness of 10 to 100 µm.

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