| 摘要 |
PROBLEM TO BE SOLVED: To provide superior low temperature heat sealing properties, eliminate the roping properties on a release section and provide fog resistance when a high humidity material is packaged in by constituting a laminate composed of a base film, a curing bonding agent layer, a polypropylene layer as an intermediate substrate layer and a releasable heat sealant layer of specified thickness. SOLUTION: This laminate 10 is constituted of a base film 1, a bonding agent layer 2, a polypropylene layer 3 as an intermediate substrate layer and a releasable heat sealant layer 4 of thickness of 1.5-10μm containing a fog- resistant agent. The fog-resistant agent contained in the heat sealant layer 4 is an alphatic ester. A recessed and projected pattern is provided on the surface of the releasable heat sealant layer 4. A coextruded cast film can be formed by the coextrusion coating carried out by the polypropylene layer 3 together with the releasable heat sealant layer 4, and the thickness of the polypropylene layer is 15-60μm by which a film can be formed by the polypropylene layer working as the intermediate layer.
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