Method for producing polarizer

A manufacturing method and technology for polarizers, which are applied in polarizing elements, optics, instruments, etc., can solve the problem of easy discoloration of polarizers, and achieve the effect of simple and low-cost manufacturing.

Active Publication Date: 2020-07-03
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the thinner the polarizer is, the easier it is to change color in a high-temperature environment

Method used

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  • Method for producing polarizer

Examples

Experimental program
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Effect test

Embodiment 1

[0077] As the thermoplastic resin substrate, an amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyPET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75° C. was used. Corona treatment is performed on one side of the substrate, and a 9:1 ratio of polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified coating is applied on the corona-treated surface at 25°C. PVA (polymerization degree 1200, acetoacetyl group modification degree 4.6%, saponification degree 99.0 mol% or more, Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") aqueous solution was dried to form a PVA-based resin layer with a thickness of 11 μm , making a stack.

[0078] The obtained laminate was stretched 4.5 times in an air atmosphere at 140° C. in a direction perpendicular to the longitudinal direction of the laminate using a tenter stretcher (stretching treatment).

[0079] Next, the laminat...

Embodiment 2

[0088] Except having used the aqueous solution (pH=4.8) of 0.5 weight% of sodium bicarbonate and 50 weight% of isopropanols as a processing liquid, it carried out similarly to Example 1, and obtained the laminated body which has a polarizer. The obtained laminate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

Embodiment 3

[0090] Except having used the aqueous solution (pH=6.0) of 0.5 weight% of sodium bicarbonate and 50 weight% of isopropanols as a processing liquid, it carried out similarly to Example 1, and obtained the laminated body which has a polarizer. The obtained laminate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

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Abstract

Provided is a method that makes it possible to simply and inexpensively produce a polarizer in which changes in color in high-temperature environments are minimized. This polarizer production method includes at least stretching and dyeing of a polyvinyl alcohol resin film. The production method also includes applying or spraying a treatment liquid on the polyvinyl alcohol resin film after the dyeing thereof. The treatment liquid has a pH in the range of 3-8, and the treatment liquid has a buffering effect in this pH range.

Description

technical field [0001] The invention relates to a method for manufacturing a polarizer. Background technique [0002] In a liquid crystal display device which is a typical image display device, polarizers (substantially polarizing plates including polarizers) are arranged on both sides of a liquid crystal cell due to its image forming method. Typically, a polarizer can be produced by dyeing a polyvinyl alcohol (PVA)-based resin film with a dichroic substance such as iodine (for example, Patent Documents 1 and 2). In recent years, there has been an increasing demand for thinner image display devices. Therefore, further thinning is required also for polarizers. However, there is a problem that the thinner the polarizer is, the more likely it will be discolored in a high-temperature environment. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent No. 5048120 [0006] Patent Document 2: Japanese Patent Application Laid-Open N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/30G02B5/305G02F1/1335
Inventor 泽田浩明森拓也三田聪司猿桥友斗
Owner NITTO DENKO CORP
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