| 摘要 |
PROBLEM TO BE SOLVED: To provide an easily peelable multilayered stretched film generating no peeling in a film longitudinal stretching process, good in stretchability and reduced in cutting and thickness irregularity and a polyester film peeled from the multilayered stretched film, high in light permeability and generating no cutting due to tearing at a time of peeling. SOLUTION: In a multilayered stretched film wherein at least one layer being a first polymer layer comprising a thermoplastic resin and at least one layer being a second polymer layer comprising a thermoplastic resin incompatible with the first polymer layer are adjacent to each other and the intermediate strength between these two layers is 0.1-20 g/cm and at least one layer being an outermost layer comprises the first polymer layer and the second and first polymer layers are alternately present, the thermoplastic resin constituting the first polymer layer is copolyester wherein a copolymerization ratio of a third component is 10-50 mol% and the thermoplastic resin constituting the second polymer layer is ethylene copolymerized polypropylene wherein an ethylene compolymerization ratio is 3-20 mol% and the thickness of the first polymer layer is l-5 μm and that of the second polymer layer is 6-50 μm. |
