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Polarizing plate

A polarizing plate and polarizing film technology, applied in the field of polarizing plates, can solve problems such as insufficiency, and achieve the effect of low cost and low manufacturing

Active Publication Date: 2016-07-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a resin base material is used, there are problems in that restrictions are easily imposed on the manufacturing process and the quality of the polarizing film to be obtained (for example, appearance, polarizing characteristics, or stretchability) is likely to be insufficient
There is also a problem with cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (manufacture of laminated body)

[0079] A polyvinyl alcohol film (polymerization degree: 2,400, saponification degree: 99.9 mol %) having a thickness of 20 μm and a resin substrate were used with a PVA-based resin aqueous solution (manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name: "GOHSEFIMER (trademark) Z -200", resin concentration: 3wt%) are laminated on each other as a binder to manufacture a laminated body. Amorphous polyethylene terephthalate (A-PET) film with a thickness of 100 μm and a corona-treated surface (manufactured by Mitsubishi Plastics, Inc., trade name: “NOVACLEAR”, Tg: 80° C., water absorption : 0.60%) was used as the resin substrate.

[0080] (manufacture of polarizing plate)

[0081] The obtained laminate was immersed in a swelling bath (pure water) at a liquid temperature of 30° C. (swelling treatment).

[0082] Next, the laminate was immersed in a dyeing bath at a liquid temperature of 30° C. while adjusting the iodi...

Embodiment 2

[0089] Except that an amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) film (Tg: 75°C, water absorption: 0.75%) with a thickness of 100 μm was used as the A polarizing plate was manufactured in the same manner as in Example 1 except for the resin base material under manufacture.

Embodiment 3

[0091] (manufacture of laminated body)

[0092] A polyvinyl alcohol film (polymerization degree: 4,300, saponification degree: 99.3 mol %) having a thickness of 20 μm and a resin substrate were used with a PVA-based resin aqueous solution (manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name: "GOHSEFIMER (trademark) Z -200", resin concentration: 3wt%) are laminated on each other as a binder to manufacture a laminated body. An amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) film (Tg: 75° C., water absorption: 0.75%) having a thickness of 100 μm and having a corona-treated surface was used as Resin base.

[0093] (manufacture of polarizing plate)

[0094] The obtained laminate was subjected to free-end uniaxial stretching (in-air stretching) at 2.0 times in the longitudinal direction (longitudinal direction) between rolls at different peripheral speeds in an oven at 120°C.

[0095] Next, the obtained laminate...

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Abstract

The invention relates to a polarizing plate. The polarizing plate according to an embodiment of the present invention includes a laminate produced by laminating a resin substrate having a percentage of water absorption of 0.2% or more and 3.0% or less and a glass transition temperature of 60 DEG C. or more on one side of a polyvinyl alcohol-based film having a thickness of 30 mu m or less, the laminate being subjected to dyeing treatment and stretching treatment including at least in-boric-acid-solution stretching. The polyvinyl alcohol-based film serves as a polarizing film and the resin substrate serves as a protective film for the polarizing film.

Description

[0001] This application claims priority under 35 U.S.C. Section 119 to Japanese Patent Application No. 2014-260264 filed on December 24, 2014, which is hereby incorporated by reference. technical field [0002] The present invention relates to polarizing plates. Background technique [0003] Polarizing plates including polarizing films are used in image display devices such as liquid crystal display devices. As a method for producing a polarizing film, a method involving forming a polyvinyl alcohol-based resin layer by a coating method on a resin base material, and stretching and dyeing the laminate (for example, Japanese Patent Application Laid-Open No. 2000-338329) has been proposed. . According to this method, a thin polarizing film can be obtained, and this method has attracted attention for its ability to contribute to the thinning of image display devices. However, when a resin base material is used, there are problems in that restrictions are easily imposed on the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/305G02B5/3033G02B1/14
Inventor 后藤周作宫武稔
Owner NITTO DENKO CORP
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