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Polarizer production method

A manufacturing method and technology for polarizers, which are applied in polarizing elements, instruments, optical elements, etc., can solve the problems of iodine environment and adverse effects on human body, and achieve the effects of preventing adverse effects, efficient dyeing, and increasing content

Active Publication Date: 2019-11-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high concentrations of iodine may have adverse effects on the environment and the human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] As a thermoplastic resin substrate, an amorphous isophthalic acid-copolymerized polyethylene terephthalate (IPA-copolymerized PET) 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 the corona-treated surface is coated with polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified at a ratio of 9:1 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 and drying to form a PVA-based resin layer with a thickness of 11 μm , thereby producing a laminate.

[0057] The obtained laminate was uniaxially stretched 2.0 times toward the free end in the longitudinal direction (long side direction) between rolls having different circumferential speeds in an oven at 120...

Embodiment 2

[0065] Except that the dyeing solution is an aqueous solution (the molar ratio of iodide and oxidizing agent in the dyeing solution=13.3 / 1) to 100 parts by weight of water, 1.7 parts by weight of potassium iodide and 0.4 parts by weight of ferric sulfate n-hydrate added, and A laminate 2 having a PVA-based resin layer (polarizer) with a thickness of 5 μm was produced in the same manner as in Example 1.

Embodiment 3

[0067] A laminate was produced in the same manner as in Example 1.

[0068]The obtained elongated 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 stretching machine.

[0069] Next, the laminate was dipped in a 30° C. dyeing solution (an aqueous solution to which 6.0 parts by weight of potassium iodide and 0.8 parts by weight of iron sulfate n-hydrate were added to 100 parts by weight of water) for 30 seconds to perform dyeing (dyeing treatment). The molar ratio of iodide to oxidant in the staining solution is 23.5 / 1.

[0070] Next, it was immersed in a crosslinking bath (a boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 60°C for 35 seconds (crosslinking treatment). ).

[0071] Next, the laminate was immersed in a cleaning ba...

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Abstract

The purpose of the present invention is to provide a polarizer production method with which dyeing can be performed more efficiently. This polarizer production method includes a step in which a solution including an iodide and an oxidant of iodine ions is used to dye a polyvinyl alcohol resin film. The oxidant is an ionic compound which comprises a cation and an anion. The standard electrode potential of any one among the anion and the cation is greater than that of iodine ions. As a result of using such a solution to perform dyeing, the polyvinyl alcohol resin film can be dyed more efficiently.

Description

technical field [0001] The invention relates to a method for manufacturing a polarizer Background technique [0002] Polarizers are used in image display devices such as liquid crystal display devices. In recent years, there has been an increasing demand for thinner image display devices. Therefore, polarizers are also being further thinned. A polarizer is typically produced by dyeing a polyvinyl alcohol (PVA)-based resin film with a dichroic substance such as iodine (for example, Patent Documents 1 and 2). When manufacturing a thin polarizer, since the thickness of the resin film also becomes thin, dyeing may not be sufficient. Therefore, a method capable of more efficiently dyeing a resin film has been sought. [0003] In addition, it is known that in the dyeing process, iodine sublimes and the iodine concentration in the dyeing solution decreases with time. This phenomenon is particularly noticeable in staining solutions containing high concentrations of iodine. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08J7/02
CPCC08J7/02G02B5/30G02B5/3025
Inventor 三田聪司森拓也泽田浩明猿桥友斗池田哲朗
Owner NITTO DENKO CORP
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