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Polarizing member, polarizing plate and image display device

A technology for image display devices and polarizers, applied in polarizing elements, optical elements, optics, etc., can solve problems such as color loss of polarizers, and achieve the effects of preventing color loss and excellent humidification durability

Active Publication Date: 2022-06-17
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the polarizer has a cut portion, there is a problem that the color of the polarizer is missing (color 抜け) due to moisture from the cut end in a humidified environment

Method used

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  • Polarizing member, polarizing plate and image display device
  • Polarizing member, polarizing plate and image display device
  • Polarizing member, polarizing plate and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] As the base material, an amorphous isophthalic acid copolymer polyethylene terephthalate (IPA copolymer 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 side is coated with polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified in a ratio of 9:1 at 25°C An aqueous solution of PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") was dried to form a PVA-based resin layer with a thickness of 11 μm , to obtain a laminate.

[0093] The obtained laminate was subjected to free-end uniaxial stretching (air-assisted stretching) to 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different circumferential speeds in ...

Embodiment 2

[0102] In the same manner as in Example 1, a polarizer having a discolored portion with a width of 10 mm was obtained. The decolorized portion formed on the four sides of the polarizing plate was cut with a cutter so that the width of the decolorized portion (blocking portion) of the polarizer was 1 mm, and a 1 mm width was formed between the dyed portion and the cut portion (polarizer edge portion). The polarizer of the decolorizing part (blocking part).

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Abstract

The present invention provides a polarizer, a polarizing plate, and an image display device that are excellent in humidity durability even when a cut portion is provided. The polarizer of the present invention has a dyed portion, a cut portion formed on the dyed portion, and a barrier portion formed between the dyed portion and the cut portion, and the width of the barrier portion is 1 mm or more. In the polarizer of the present invention, even when water infiltrates from the cut end, the water stays in the barrier portion and can be prevented from reaching the dyed portion. As a result, it is possible to prevent color loss of the polarizer and deterioration of polarization characteristics.

Description

technical field [0001] The present invention relates to a polarizer, a polarizer, and an image display device. More specifically, it relates to a polarizer excellent in humidification durability even when it has a cut portion, a polarizer including the polarizer, and an image display device including the polarizer. Background technique [0002] Polarizing plates are used in various image display devices such as mobile phones and notebook personal computers (PCs). Polarizers are usually cut into shapes suitable for use. For example, Patent Document 1 discloses a method for producing a polarizing member in which a polarizing member is cut into a sheet shape from a polarizing member in a roll shape. When the polarizer has a cut portion, there is a problem that the polarizer suffers from color loss (color loss) due to moisture from the cut end portion in a humidified environment. Therefore, a polarizer having excellent humidification durability has been sought. [0003] prio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/30G02F1/133528G02B5/3025G02F1/1335
Inventor 望月政和中田美惠
Owner NITTO DENKO CORP
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