| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminated film which is a laminated film having a resin layer formed of a polyvinyl alcohol resin formed on a substrate film, and prevents generation of optical uneven streaks when assembled in a polarizing plate; a method for producing the laminated film; a method for producing a polarizing laminated film from the laminated film; and a method for producing a polarizing plate from the laminated film.SOLUTION: A laminated film has a resin layer formed of a polyvinyl alcohol resin having an average value of thicknesses in a width direction of 10 μm or less formed on a long-sized substrate film having a tensile elastic modulus at 80°C of 180 MPa or more, a maximum amplitude of the thickness in the width direction of the resin layer measured at measuring intervals of 0.05-2 mm by an interference film thickness gauge is 1.3 μm or less, a value of the maximum amplitude in a period of 30-70 mm when film thickness distribution in the width direction of the resin layer has been subjected to fast Fourier transformation is 0.09 or less, and the substrate film is a film which is peeled later.SELECTED DRAWING: Figure 1 |
