METHOD FOR MANUFACTURING OPTICAL FILM

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical film comprising an acrylic resin, in which the optical film achieves the reduction of sticking of foreign matters or occurrence of flaws and improves optical characteristics such as retardation unevenness although the optical fil...

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Bibliographische Detailangaben
Hauptverfasser:	SHIROSHIMA SATOHIRO, UKAMURA TADAYOSHI, NIWA HIROKAZU
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical film comprising an acrylic resin, in which the optical film achieves the reduction of sticking of foreign matters or occurrence of flaws and improves optical characteristics such as retardation unevenness although the optical film includes an easily-adhesive layer and is subjected to trimming processing.SOLUTION: A method for manufacturing an optical film comprises: a step of melting a thermoplastic resin including an acrylic polymer and film-forming to form the belt-shaped original film; a step of longitudinally stretching the formed original film; a step of laterally stretching the longitudinally stretched original film to form an optical film; and a step of winding the optical film, and these steps are continuously executed. The method further comprises a step of applying an easily-adhesive composition on a surface of the original film between the longitudinal stretching step and the lateral stretching step. In the lateral stretching step, the applied film of the easily-adhesive composition formed on the surface of the film is dried by the heat applied to the original film to form an easily-adhesive layer. The method further comprises a step of trimming the optical film between the lateral stretching step and the winding step.