| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method of manufacturing industrially favorable a polycarbonate resin film which shows uniformly low retardation the whole width direction thereof in extrusion and is useful for an optical use. SOLUTION: The polycarbonate resin film is manufactured by a process wherein a molten polycarbonate resin is extruded in the shape of the film from a T-die of an extruder, cooled by a plurality of cooling rolls and then transferred by a plurality of transfer rolls. On this occasion, the surface temperature in the width direction of the film extruded from the final cooling roll is controlled to be in the range of±5 deg.C, when the film is taken off.</p> |
