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    • 8. 发明授权
    • Process for making a polarizing film
    • 制造偏光膜的方法
    • US06833090B2
    • 2004-12-21
    • US10126954
    • 2002-04-22
    • Kazuki TsuchimotoSeiji KondouAkihiro Nishida
    • Kazuki TsuchimotoSeiji KondouAkihiro Nishida
    • B29D1100
    • G02B5/3033B29C55/04B29C71/0072B29D7/01B29K2029/04
    • The present invention provides a polarizing film having a high polarization degree and high transmittance, a process for producing the polarizing film, and a polarizing plate using the polarizing film, and an optical member. In the process for producing the polarizing film, a polyvinyl alcohol-based film is dry-stretched uniaxially, relaxed in an aqueous solution containing iodine or a dichroic dyestuff, and further stretched in an aqueous solution containing a PVA crosslinking agent. It is preferable that the polyvinyl alcohol-based film has a dry-stretch ratio of at least 2, the film after relaxation has a stretch ratio of at least 1.02, and the total stretch ratio is at most 6.5. It is also preferable that the relaxation rate is at most 10% of the dry-stretch ratio.
    • 本发明提供了具有高偏振度和高透射率的偏振膜,偏振膜的制造方法和使用该偏振膜的偏振片以及光学元件。 在偏光膜的制造方法中,将聚乙烯醇系膜单轴拉伸干燥,在含有碘或二色性染料的水溶液中松弛,并进一步在含有PVA交联剂的水溶液中拉伸。 优选的是,聚乙烯醇系膜的干拉伸比为2以上,弛豫后的拉伸倍率为1.02以上,总拉伸倍率为6.5以下。 松弛率也优选为干拉伸倍率的10%以下。