Method for manufacturing optical laminates

Abstract

To provide a method for manufacturing optical laminates that can reduce thickness variations in the adhesive layer and stably produce optical laminates with excellent optical properties. [Solution] A method for manufacturing an optical laminate according to an embodiment of the present invention includes a first bonding step and a cutting step. In the first bonding step, a first optical film and a second optical film are bonded together via an adhesive layer composed of a curable adhesive to prepare a long laminated film. In the cutting step, the laminated film is cut along the longitudinal direction of the laminated film to prepare a plurality of divided films. In the laminated film, the width of the adhesive layer is less than or equal to the width of the first optical film and the second optical film, respectively.

Claims

1. A first lamination step involves bonding a first optical film and a second optical film together via an adhesive layer composed of a curing adhesive to prepare a long laminated film. The process includes a cutting step of cutting the laminated film along the longitudinal direction of the laminated film to prepare a plurality of divided films, In the laminated film, the width of the adhesive layer is less than or equal to the width of the first optical film and the second optical film, A method for manufacturing an optical laminate, wherein the widths of two or more of the plurality of divided films are 0.1 times or more the width of the adhesive layer in the laminated film.

2. The method for manufacturing an optical laminate according to claim 1, wherein the width of each of the plurality of divided films is 0.53 times or less the width of the adhesive layer in the laminated film.

3. The method for manufacturing an optical laminate according to claim 2, wherein the width of each of the plurality of divided films is 0.50 times or less the width of the adhesive layer in the laminated film.

4. A method for manufacturing an optical laminate according to any one of claims 1 to 3, wherein each of the first optical film and the second optical film has an elongated shape.

5. A method for manufacturing an optical laminate according to any one of claims 1 to 3, wherein the widths of two or more of the plurality of divided films are substantially the same as those of the other divided films.

6. A method for manufacturing an optical laminate according to any one of claims 1 to 3, wherein the width of two or more of the plurality of divided films is 0.4 times or more the width of the adhesive layer in the laminated film.

7. A method for manufacturing an optical laminate according to any one of claims 1 to 3, further comprising a second lamination step of laminating at least one of the plurality of divided films with a third optical film.

8. The third optical film has a long shape, The method for manufacturing an optical laminate according to claim 7, wherein the width of the third optical film is 0.8 to 1.2 times the width of each of the plurality of divided films.

9. The method for manufacturing an optical laminate according to claim 7, wherein the third optical film includes a polarizer.

10. The first optical film includes a first surface film that comes into contact with the adhesive layer in the first lamination step, The second optical film includes a second surface film that comes into contact with the adhesive layer in the first lamination step, The thickness of the adhesive layer is 2 μm or less. A method for manufacturing an optical laminate according to any one of claims 1 to 3, wherein the thickness of at least one of the first surface film and the second surface film is 2 μm or less.

11. The method for manufacturing an optical laminate according to claim 10, wherein the thickness of each of the first surface film and the second surface film is 3 μm or less.

12. The method for manufacturing an optical laminate according to claim 10, wherein the first surface film and / or the second surface film is an orientation solidified layer of a liquid crystal compound.

13. The method for manufacturing an optical laminate according to any one of claims 1 to 3, wherein the laminated film has an in-plane phase difference.

14. The method for manufacturing an optical laminate according to claim 13, wherein the laminated film functions as a λ / 4 plate.

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