| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a film which does not cause whitening upon hot water treatment, and yet has high brilliance and natural metallic tone. <P>SOLUTION: The film is a biaxially oriented film. The film is an alternate lamination of: a layer composed of a crystalline polyester resin A (A layer); and a layer (B layer) composed of an amorphous polyester resin B containing a crystalline resin dispersed therein, the B layer having an average thickness of 30-180 nm. Here, a total number of the laminated A layers is equal to 200 or more, and a total number of the laminated B layers is also equal to 200 or more. The ratio of the total number of the laminated A layers to the total number of the laminated B layers is in a range of 3.0 to 0.8. When a vertical cross section of the film is observed with a transmission electron microscope (TEM), the crystalline resin dispersed in the B layer is dispersed in particles with particle diameter of 1-20 nm, an area ratio of the crystalline resin occupying the cross section area of the B layer is 0.1-0.3. The A layers and the B layers laminated in not less than 200 layers, respectively are sandwiched by 1-7 μm thick layers of the crystalline polyester resin. <P>COPYRIGHT: (C)2012,JPO&INPIT |
