| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene film which has a seal layer having low heat-seal temperatures and small decrease in heat-seal strength with the lapse of time and which can be easily laminated to another resin film. SOLUTION: The polypropylene film is composed of a laminate layer comprising a propylene-ethylene copolymer and ethylene-α-olefin copolymer, an intermediate layer comprising a propylene single polymer and/or propylene-ethylene copolymer, and a seal layer comprising 30-60 wt.% of a specific propylene- ethylene copolymer, 30-60 wt.% of specific butene-1-propylene copolymer and 5-25 wt.% of specific ethylene-α-olefin copolymer.
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