| 摘要 |
PROBLEM TO BE SOLVED: To industrially provide a laminated biaxially stretched polyester film more excellent in easy cutting properties than a conventional improved laminated biaxially stretched polyester film. SOLUTION: In the laminated biaxially stretched polyester film excellent in easy cutting properties, the laminated film has at least film layers respectively constituted of a crystalline polyester (A) and a crystalline polyester (B) both of which satisfy the following (1) to (5): (1) the melting point of the crystalline polyester (B) is lower than that of the crystalline polyester (A) by 25°C or above; (2) the intrinsic viscosity of the crystalline polyester (A) is 0.40-0.55; (3) the intrisic viscosity of the crystalline polyester (B) is 0.60-0.90, (4) the thickness ratio of the layer of the crystalline polyester (A) is 10-50% of the total thickness; and (5) the crystallization index Q of the layer of the crystalline polyester (B) is 0.2 or below. COPYRIGHT: (C)2005,JPO&NCIPI
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