POLY(VINYL ALCOHOL)-BASED FILM FOR PRODUCING POLARIZING FILM, POLARIZING FILM OBTAINED USING SAME, AND AQUEOUS SOLUTION OF POLY(VINYL ALCOHOL)-BASED RESIN

• Main Authors: YABE TOSHIKAZU, KITAMURA SHUICHI, KANI SHOUICHI
• Format: Patent
• Language: Chinese; English
• Published: 07.08.2020
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

As a poly(vinyl alcohol)-based film for producing a polarizing film, from which it is possible to produce a polarizing film which can reduce shrinkage in the width direction during production of the polarizing film, that is, a polarizing film having a high width yield, the present invention provides a poly(vinyl alcohol)-based film which has a thickness of 5-75 [Mu]m, a width of 2 m or more and alength of 2 km or more and which is characterized in that the degree of swelling X (%) in the width direction after being immersed for 5 minutes in water at 23.5 DEG C is such that 120<=X<=140, and the film width yield W (%), as determined by carrying out a polarizing film production test, is such that W>=43. 作为能够减少偏光膜制造时在宽度方向上的收缩的、即能以高的宽度获得率制造偏光膜的偏光膜制造用聚乙烯醇系薄膜，提供一种偏光膜制造用聚乙烯醇系薄膜，其特征在于，是厚度5～75μm、宽度2m以上、长度2km以上的聚乙烯醇系薄膜，在23.5℃下水中浸渍5分钟后的宽度方向的溶胀度X(％)为120≤X≤140，并且，通过进行偏光膜制造试验而求出的薄膜宽度获得率W(％)为W≥43。