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Method For Manufacturing Polarizer

A manufacturing method and technology for polarizers, which are applied to polarizing elements and other directions, can solve the problems of poor accuracy, easy generation of air bubbles, and inability to obtain non-polarized parts, and achieve the effect of excellent optical properties.

Inactive Publication Date: 2016-08-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the stain-resistant layer is not removed, the stain-resistant layer is partially present on the surface of the polarizer, so there is also a problem that, for example, air bubbles are easily generated when the protective film is pasted.
In addition, due to defects such as a part of the dye-resistant layer peeling off from the surface of the polyvinyl alcohol-based resin layer during dyeing, there are problems such as failure to obtain a non-polarizing portion with a predetermined shape, and poor precision.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0110] (manufacturing of laminated body)

[0111] As the resin substrate, a long amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyethylene PET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75° C. was used.

[0112] Corona treatment is performed on one side of the resin substrate, and at 25°C, polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200 mol%) are mixed in a ratio of 9:1. , acetoacetyl modification degree of 4.6%, saponification degree of 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") aqueous solution is coated on the above-mentioned corona treated surface and dried to form a 11 μm thick A PVA-based resin layer is used to make a laminate.

[0113] (Production of polarizing plate)

[0114] The obtained laminate was immersed for 30 seconds in an insolubilization bath (an aque...

Embodiment 2

[0123] The obtained laminate was uniaxially stretched in the longitudinal direction (longitudinal direction) to 2.0 times in the oven at 120° C. between rollers with different peripheral speeds (assisted stretching in the air), and then subjected to the above-mentioned insolubilization treatment, and stretched in water so that Except that the total draw ratio was 5.5 times, it carried out similarly to Example 1, and obtained the polarizing plate which has a non-polarizing part.

Embodiment 3

[0125] A polarizing plate with a thickness of 12 μm is formed on a resin substrate, and the immersion time in an aqueous solution of sodium hydroxide is set to 30 seconds in the alkali treatment, except that, it is performed in the same manner as in Example 1 to obtain a polarizing plate having a non-polarizing portion. polarizer.

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Abstract

The invention relates to a method for manufacturing polarizer. Provided is a method for manufacturing, with high productivity, a polarizer having a non-polarizing section. This method for manufacturing a polarizer includes a step for forming a polyvinyl alcohol resin layer on a resin substrate and obtaining a layered body, a step for staining the polyvinyl alcohol resin layer with iodine, a step for stretching the layered body, and a step for bringing the polyvinyl alcohol resin layer into contact with a basic solution and forming a non-polarizing section after the dyeing and stretching.

Description

technical field [0001] The present invention relates to a method of manufacturing a polarizer. In more detail, this invention relates to the manufacturing method of the polarizing plate which has a non-polarizing part. Background technique [0002] Image display devices such as mobile phones and notebook personal computers (PCs) are equipped with internal electronic components such as cameras. Various studies have been made to improve camera performance and the like of such image display devices, and further improvements in camera performance and the like are desired as smartphones and touch-panel-type information processing devices spread rapidly. In addition, in order to cope with diversification of shapes and higher functionality of image display devices, a polarizing plate partially having a non-polarizing portion is required. [0003] Usually, the above-mentioned non-polarizing portion is formed by subjecting a polarizing plate to perforation processing, and there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 后藤周作八重樫将宽
Owner NITTO DENKO CORP
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