| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-layer laminated film which is excellent in interlayer adhesion properties and tear resistance and has optical reflection. SOLUTION: The multi-layer laminated film in which first layers and second layers are laminated alternately so that the total number of the layers is at least 11 is stretched biaxially. The thickness of each layer is 0.05-0.5μm. The first layers are constituted of a polyester composition, and the second layers are constituted of a polyester composition different from the composition of the first layers. The maximum reflectance of light of a wavelength of 350-2,000 nm is higher by at least 20% than the baseline of the reflectance of light obtained from a light reflectance curve. In a range of every 5 m length in the consecutive film making direction and in a total width range in the width direction, the difference between the maximum thickness and the minimum thickness is≤3μm. In both the consecutive film making direction and the width direction, the thickness difference between a crest and a trough of adjacent thicknesses is≤1μm. A distance in the film surface between the crest and the trough of adjacent thicknesses is≥10 mm. COPYRIGHT: (C)2004,JPO&NCIPI
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