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US 2008/0075894 A1Published application
Thermoplastic Film And Method Of Manufacturing The Same
AssigneeFUJIFILM Corporation
InventorsMasaaki Otoshi, Kiyokazu Hashimoto
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AssigneeFUJIFILM Corporation
InventorsMasaaki Otoshi, Kiyokazu Hashimoto
Estimating the term…
It is an object to provide a method of manufacturing a thermoplastic film capable of improving optical properties of the thermoplastic film obtained by drawing it and to provide the thermoplastic film. In a transverse drawing process part 30 for drawing a thermoplastic film 16 in a transverse direction is constituted by a preheating zone T1 and transverse drawing zones T2, T3 and cooling zones T4, T5, and the steps of the transverse drawing zone T3 and performed thereafter (cooling zone T4 and T5) are maintained at a glass transition temperature Tg or less. The temperature of the preheating zone T1 is set to be higher than that of the cooling zone T4 and falls within the range of −10 C to +30 C relative to those of the transverse drawing zones T2 and T3.
A method of manufacturing a thermoplastic film by drawing the thermoplastic film in a transverse direction, characterized in that the steps after the drawing until the film comes out from a tenter are carried out while maintaining the film at a glass transition temperature or less.
A method of manufacturing a thermoplastic film by drawing the thermoplastic film in a transverse direction, characterized in that the film temperature before drawing is higher than the film temperature after drawing.
A thermoplastic film characterized in that an orientation angle falls within the range of 0°±5° or 90°±5°, the magnitude of bowing strain falls within the range of 10%, in-plane retardation (Re) falls within the range of 0 nm to 500 nm, and retardation (Rth) in a thickness direction falls within the range of 30 nm to 500 nm (both inclusive).
Dependencies are inferred from the claim text.