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    • 4. 发明申请
    • OPTICAL FILM AND PROCESS FOR PRODUCING THE SAME
    • 光学膜及其制造方法
    • US20100179263A1
    • 2010-07-15
    • US12665345
    • 2008-06-12
    • Katsuhiko Heki
    • Katsuhiko Heki
    • C08K5/12B29D11/00
    • B29C47/8845B29C47/0021B29C47/0057B29C47/34B29C47/8805B29C47/886B29C47/8885B29C47/889B29C47/92B29C2947/92704B29C2947/92923B29K2105/0005B29K2105/256B29K2995/0018B29K2995/0072B29L2011/00B29L2031/3475
    • An optical film of high planarity that even in the use of an optical film material containing a non-resinous additive in an amount of 5 mass % or more, would exhibit inexpensive satisfactory roll cleaning effects, and that would find application in, especially, various functional films such as a retardation film and a protective film for polarization plate for use in a liquid crystal display apparatus, etc.; and a process for producing the optical film. There is disclosed a process for producing an optical film according to a melting casting film forming method, including extruding a melt of resin blend containing a resin and 5 mass % or more of non-resinous additive through a casting die into a film form, wherein a first roller (5) for cooling has a temperature of the melting point of the additive to the glass transition temperature (Tg) of the resin blend. Preferably, the first roller (5) for cooling has a peripheral speed (S1) exhibiting a ratio between the same and the peripheral speed (S3) of a third roller (7) for cooling, S3/S1, of 1.001 to 1.05. Preferably, a filmlike molten blend is pressed against the first roller (5) for cooling at a linear pressure of 0.5 to 50 N/mm by means of a second roller (6) for pressure application.
    • 即使在使用含有5质量%以上的非树脂添加剂的光学薄膜材料的情况下,也具有高平坦度的光学薄膜,因此具有廉价的令人满意的辊清洗效果,特别适用于各种 液晶显示装置中使用的延迟膜和偏振板用保护膜等功能膜等; 以及光学膜的制造方法。 公开了根据熔融流延膜形成方法制造光学膜的方法,包括通过铸模将含有树脂和5质量%以上非树脂添加剂的树脂混合物熔体挤出成膜形式,其中 用于冷却的第一辊(5)具有添加剂的熔点温度与树脂共混物的玻璃化转变温度(Tg)。 优选地,用于冷却的第一辊(5)具有呈现与第三辊(7)的冷却速度(S3)的比率的圆周速度(S1),S3 / S1为1.001至1.05。 优选地,通过用于压力施加的第二辊(6)将薄膜状熔融共混物压靠在第一辊(5)上,以线性压力为0.5〜50N / mm进行冷却。