| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical film which is improved in dimensional stability by a solution casting film forming method and in retardation development properties and can obtain high retardation and a method for producing the optical film and to prevent the corner nonuniformity of a liquid crystal display and the occurrence of a frame failure to respond to requirements for thinning, widening, and quality-improving a protective film for a polarizing plate etc., in recent years. SOLUTION: In the method for producing the optical film, after a web (film) stretching process, embossing for drying is applied to both end parts of a film, and an embossed part for drying having uneven parts composed of a large number of projections each having a convex arcuate cross section and recesses each having a concave arcuate cross section in both end parts of the film is given. The film compression residual distortion rate of the embossed part for drying is made to be 5-50%. After the film with the embossed part for drying is conveyed and dried by a conveyance roll, the embossed part for drying is cut and removed. Next, embossing for a product is applied to the end part of the film. After an embossed part for the product is given, the film is taken up. COPYRIGHT: (C)2009,JPO&INPIT |
