| 摘要 |
PROBLEM TO BE SOLVED: To provide a stretched packaging film having a good heat resistance, a high upper limit temperature of heat sealing, a good piercing strength and further no environmental sanitary problem. SOLUTION: The stretched packaging film comprises a three-layer structure of a base material layer and both side surface layers. In this case, the base material layer contains a polypropylene composition containing 3 to 40 wt.% of a high crystalline polypropylene having an mmmm pentad index obtained by a<13> C-NMR of 0.970 to 0.990 and 97 to 60 wt.% of a propylene-ethylene copolymer having 10 to 30 mol.% of a content of a monomer unit based on an ethylene and 90 to 70 mol.% of a content of a monomer unit based on a propylene. And, both the side layers each contains a resin having heat sealability such as an ethylene-vinyl acetate copolymer or the like. |
