| 摘要 |
PURPOSE:To enhance scratch resistance, in a biaxially oriented laminated film having a laminated structure consisting of at least three or more layers, by adding particles having a specific particle size range with respect to the thickness of the outermost layer to the outermost layer at least on the single surface of the film and specifying the number of projections and orientation coefficient of the surface of the film. CONSTITUTION:In a biaxially oriented laminated film having a laminated structure consisting of at least three or more layers at least one of which is biaxially oriented, particles such as silica particles are added to the outermost layer at least on the single surface of the film. In this case, the relation of 0.2d<=t<=10d is satisfied when the particle size of the particles is set to d(nm) and the thickness of the outermost layer is set to t(nm). Further, the outermost layer is formed so that the number of projections on the surface of the film is 3X10<3>-2X10<5>/mm<2> and the surface orientation coefficient fn of the film is 0.16-0.280. For example, the particles are added to a polyester film by polymerizing a slurry prepared by dispersing the particles in ethylene glycol with a dicarboxylic acid component. |
