| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently and conveniently manufacturing an optical retardation film of which the optical retardation is highly precisely uniformized and which exhibits excellent display quality throughout nearly the entire region when installed in a liquid crystal display device. SOLUTION: A thermoplastic norbornene type resin film is produced by film forming a thermoplastic norbornene type resin composition containing 1-100 pts.wt. thermoplastic resin which is soluble in the thermoplastic norbornene type resin, has a glass transition temperature lower than that of the thermoplastic norbornene type resin and has 200-10,000 number-average molecular weight in relation to 100 pts.wt. of the thermoplastic norbornene type resin. The method for manufacturing the optical retardation film is characterized by immersing the thermoplastic norbornene type resin film in a solvent which does not dissolve the thermoplastic norbornene type resin but dissolves the thermoplastic resin, extracting part of the thermoplastic resin therefrom and stretching the film. Also the method for manufacturing the optical retardation film is characterized by using a melting extrusion film forming method as the film forming method for the thermoplastic norbornene type resin composition. |
