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    • 9. 发明专利
    • Method of manufacturing polarizing film
    • 制造极化膜的方法
    • JP2014016649A
    • 2014-01-30
    • JP2013209810
    • 2013-10-07
    • Kuraray Co Ltd株式会社クラレ
    • KATSUNO RYOJIIKI TAKASHIKAZAFUJI OSAMU
    • G02B5/30G02F1/1335
    • B29C41/26B29C41/46B29K2029/04B29K2995/0034C08J5/18C08J2429/04G02B5/3033
    • PROBLEM TO BE SOLVED: To provide a polarizing film with little unevenness of transmittance between a central portion and end portions and which is manufactured from a PVA-based polymer film from which a polarizing film with little unevenness of transmittance between the central portion and the end portion can be produced.SOLUTION: A method of manufacturing a polarizing film includes dyeing, uniaxially stretching, fixing, and drying a PVA-based polymer film which satisfies 0.5 mm≤W-W≤5 mm, where W(mm) represents an amount of dimensional change in water of a central portion and W(mm) represents an amount of dimensional change in water (an average value) at 0.3 m from both end portions along a straight line in the width direction (a direction perpendicular to the longitudinal direction) of the PVA-based polymer film. (The amount of dimensional change in water refers to longitudinal elongation of a PVA-based polymer film sample, in a section having a pre-immersion longitudinal length of 250 mm, when immersing the same in pure water at 30°C for 5 minutes.)
    • 要解决的问题:提供一种偏光膜,其在中心部分和端部之间几乎不具有透光率不均匀性,并且由PVA基聚合物膜制成,其中在中心部分和末端之间具有很小的透光率不均匀的偏光膜 可以制造部分。解决方案:制造偏光膜的方法包括染色,单轴拉伸,定影和干燥满足0.5mm≤WW≤5mm的PVA类聚合物膜,其中W(mm)表示尺寸的量 中心部分的水的变化,W(mm)表示沿宽度方向(垂直于纵向的方向)的直线的两端部的0.3m处的水的尺寸变化量(平均值)为 PVA类聚合物膜。 (在30℃浸渍5分钟的纯水中时,水分尺寸变化量是指PVA类聚合物膜样品在浸渍前纵长为250mm的截面中的纵向伸长率。 )