OPTICAL FILMS AND PROCESS FOR PRODUCTION THEREOF

• Main Authors: TAKAGI MASAHITO, NIWA HIROKAZU
• Format: Patent
• Language: English; Korean
• Published: 18.02.2011
• Subjects: 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; 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

An optical film which contains little impurities and is excellent in physical properties and surface appearance, produced by melt-extruding an acrylic resin which has a glass transition temperature of 110 to 200°C and a viscosity of 250 to 1000Pa s as determined at a shear rate of 100(1/s) and a resin temperature of 270°C by the use of an extruder provided with either a barrier flight screw or a screw with a mixing section with the cylinder and die of the extruder preset at temperatures lower than the glass transition temperature of the acrylic resin plus 145 (°C); and a process for the production of the film.