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Polarization plate and manufacturing method therefor

A manufacturing method and polarizer technology, applied in polarizing elements, optics, instruments, etc., can solve the problems of polarizer deterioration and easy decolorization at the edge of the polarizer, and achieve the effect of excellent durability and not easy to fade

Active Publication Date: 2020-10-16
NITTO DENKO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Even when the polarizer protective film is bonded to the main surface of the polarizer, since the end face of the polarizer is exposed, the polarizer at the edge of the polarizer deteriorates and discoloration is likely to occur due to moisture intrusion from the end face

Method used

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  • Polarization plate and manufacturing method therefor
  • Polarization plate and manufacturing method therefor
  • Polarization plate and manufacturing method therefor

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Embodiment

[0088] Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these Examples.

[0089] [Production of polarizing plate with adhesive]

[0090]

[0091]Corona treatment was performed on one side of an amorphous polyester film (polyethylene terephthalate / isophthalate; glass transition temperature 75° C.) with a thickness of 100 μm, and at 25° C. The corona-treated surface coating contains polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified polyvinyl alcohol (Nippon Synthetic Chemical Industry, "GOHSEFIMER Z200"; polymerization degree 1200, acetoacetyl modification degree of 4.6%, saponification degree of 99.0 mol% or more) and dried to prepare a laminate in which a PVA-based resin layer with a thickness of 11 μm is provided on an amorphous polyester film substrate.

[0092] The laminate was uniaxially stretched to 2.0 times in the longitudinal direction ...

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Abstract

A sheet polarization plate (10) is provided with a transparent film (31, 32) on at least one surface of a polyvinyl alcohol-based polarizer (21). The polarizer is preferably denatured by irradiating an end surface of the polarization plate obtained by being cut into a sheet, with a light beam having a wavelength in which the light beam can be absorbed by the polarizer. A ratio A3300 / A1089 of an absorbance A3300 of a peak around 3300 cm-1 to an absorbance A1089 of a peak around 1089 cm-1 in an infrared absorption spectrum at an end part in a surface of the polarizer having been subjected to thedenaturation is preferably less than A3300 / A1089 in the infrared absorption spectrum at the center part in the surface.

Description

technical field [0001] The present invention relates to a polarizing plate and a manufacturing method thereof. Background technique [0002] Liquid crystal display devices and organic EL display devices are widely used as various image display devices such as mobile devices, car navigation devices, monitors for personal computers, and televisions. A liquid crystal display device is equipped with a polarizing plate on the visible side surface of a liquid crystal cell due to its display principle. In a transmissive liquid crystal display device, polarizing plates are arranged on both surfaces of a liquid crystal cell. For organic EL display devices, in order to prevent external light from being reflected at the metal electrode (cathode) and look like a mirror, sometimes a circular polarizing plate (typically a combination of a polarizing plate and a 1 / 4 wave plate) is arranged on the visible side surface. layered body). [0003] As a polarizer constituting a polarizing plat...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B5/30G02B5/3033G02B1/14B32B7/023
Inventor 山崎达也
Owner NITTO DENKO CORP
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