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Polarizing film, polarizing plate, and method for producing said polarizing film

A manufacturing method and technology of polarizing film, applied in the field of polarizing film, can solve problems such as easy decolorization at the end, and achieve the effect of inhibiting decolorization

Pending Publication Date: 2021-11-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned thin polarizing film has a problem that discoloration tends to occur at the end portion (especially the end portion in the width direction) in a high-humidity environment.

Method used

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  • Polarizing film, polarizing plate, and method for producing said polarizing film
  • Polarizing film, polarizing plate, and method for producing said polarizing film
  • Polarizing film, polarizing plate, and method for producing said polarizing film

Examples

Experimental program
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Effect test

Embodiment 1

[0116] As the thermoplastic resin substrate, use a long amorphous isophthalic acid copolymerized polyethylene terephthalate film (thickness: 100 μm) with a Tg of about 75°C, and apply it to one side of the resin substrate. Corona treatment.

[0117] PVA-based resin 100 made by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER") at a ratio of 9:1 13 parts by weight of potassium iodide was added to parts by weight, and the resultant was dissolved in water to prepare an aqueous PVA solution (coating liquid).

[0118] The above-mentioned PVA aqueous solution was applied to the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm to produce a laminate.

[0119] The obtained laminate was uniaxially stretched to 3.0 times in the longitudinal direction (longitudina...

Embodiment 2

[0129] A polarizing plate was produced in the same manner as in Example 1 except that the concentration of the dyeing bath was adjusted so that the single transmittance of the polarizing film before contact with the treatment liquid was 41.9%.

Embodiment 3

[0131] A polarizing plate was produced in the same manner as in Example 1 except that the concentration of the dyeing bath was adjusted so that the single transmittance of the polarizing film before contact with the treatment liquid was 45.3%.

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Abstract

The present invention provides a polarizing film in which color loss at the edge thereof under a high humidity environment is suppressed. This polarizing film is formed of a polyvinyl alcohol resin film containing iodine, wherein when a single layer transmittance is set as x% and an orientation function of the polyvinyl alcohol resin film is set as y, expression (1) is satisfied.Expression (1): y>=-0.06x+2.88.

Description

technical field [0001] The invention relates to a polarizing film, a polarizing plate and a manufacturing method of the polarizing film. Background technique [0002] In a liquid crystal display device which is a typical image display device, polarizing films are arranged on both sides of a liquid crystal cell because of an image forming method. As a method for producing a polarizing film, for example, a method has been proposed in which a laminate having a resin base material and a polyvinyl alcohol (PVA)-based resin layer is stretched, and then dyed to obtain a polarizing film on the resin base material. (eg, Patent Document 1). According to such a method, a thin polarizing film can be obtained, and thus has attracted attention as a method contributing to the reduction in thickness of image display devices in recent years. However, the above-mentioned thin polarizing film has a problem in that end portions (especially end portions in the width direction) tend to be disco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/06G02F1/1335B29K29/00B29L9/00
CPCG02B5/30B29C55/06G02F1/1335G02B5/3033G02B1/04C08J5/18C08J7/04G02B1/14
Inventor 高永幸佑滨本大介上条卓史
Owner NITTO DENKO CORP
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