| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayered laminated film substantially containing no heavy metal element, enhanced in interlaminar bonding properties, suppressed in the formation of color irregularity or die streaks and hard to tear itself. SOLUTION: The multilayered laminated film is constituted by alternately laminating first layers of a crystalline thermoplastic resin and second layers of a crystalline thermoplastic resin different from that of the first layers so that the total number of the layers is 11 or above layers and biaxially stretching the formed laminated film. The thickness of each of the layers is 0.05-0.5μm, the maximum reflectivity of light within a wavelength range of 350-2,000 nm of the laminated film is higher than the reflectivity of a base line, which is obtained from the light reflectivity curve within the wavelength range of 350-2,000 nm by 20% or above, the amount of heavy metals contained in the laminated film is 20 ppm or below and the amount of arsenic therein is 2 ppm or below. COPYRIGHT: (C)2007,JPO&INPIT |
