| 摘要 |
PROBLEM TO BE SOLVED: To provide a biaxially oriented laminated polyester film having not only extremely high flatness properties, which are required in the field of a base film such as a metal thin film type magnetic recording medium, but also self-recovery properties. SOLUTION: The biaxially oriented laminated polyester is composed of a film layer A with a thickness of 0.5-5μm containing no inert particles, the film layer B laminated on one side of the film layer A and the film layer C laminated on the other side of the film layer A. The film layer B has a thickness of 9.5μm or below larger than the thickness of the film layer A and contains inert particles B having an average particle size 0.01-0.1 times its thickness (tB). The film layer C is composed of inert particles C with an average particle size of 5-50 nm and a binder resin and has a thickness of 1-20 nm. COPYRIGHT: (C)2007,JPO&INPIT
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