| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite film which is highly resistant to heat and impact, highly transparent and rigid with other advantages such as low temperature heat sealing properties and self-pressure-sensitive adhesion. SOLUTION: This composite polyolefin film comprises a resin material layer formed of 50-100 wt.% of crystalline polypropylene and 50-0 wt.% of an ethylene.α-olefin copolymer which has the H/W value of 2 or more when the height of a largest peak, whose temperature is 15-85 deg.C, of an elution curve to be obtained by eluation fractionation at temperatures rise is given as H and the width of the peak at a height which is one third of the height of the peak is given W, and a resin material layer (a surface layer) formed of 0-95 wt.% of a propylene polymer whose fusion peak by DSC is within the range of 110-165 deg.C and 100-5 wt.% of the ehtylene.α-olefin copolymer with the H/W value of 2 or more, these described layers being laminated over each other.
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