| 摘要 |
A method for producing an optical film including a birefringent layer having a refractive index distribution satisfying nx>nz>ny that can be produced by a small number of steps, contains less foreign matter trapped therein, and has high productivity. An optical film including a birefringent layer, wherein the method includes steps of: forming a coating film by directly applying a material for forming a birefringent layer on the shrinkable film; shrinking the coating film in a first direction by shrinking the shrinkable film; and stretching a laminate of the shrinkable film and the coating film in a second direction orthogonal to the first direction, wherein the material for forming a birefringent layer contains at least one resin selected from the group consisting of norbornene resins, polycarbonate resins, cellulose resins, polyamides, and polyurethanes, and wherein the birefringent layer has a refractive index distribution satisfying nx>nz>ny. |
