| 摘要 |
PURPOSE:To obtain a polarizing film that is excellent in durability and will be used for a liquid crystal display and so on, by providing a forcible driving roll between a low speed roll and a high speed roll and causing a film consisting of a thermoplastic resin and an optical two-tone substance to slide on the roll surface at the stretching temperature or more. CONSTITUTION:An optical two-tone material (e.g. anthraquinone type two-tone dyes, etc.) is added to a thermoplastic resin (e.g. polyethylene terephthalate resins, etc.), and after the mixture is stirred uniformly, the mixture is melt-extruded from a T-die of an extruder, and is quenched to produce an unstretched film. This unstretched polarizing film is passed on at least one forcible driving roll positioned between a high speed roll and a low speed roll comprising a pair of pinch rolls, thereby causing the film in contact with the roll surface to slide thereon at the stretching temperature or more to produce the desired polarizing film. |
