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Polarizer

A polarizer and polarizing film technology, applied in the field of polarizers, can solve the problems of reduced durability of optical characteristics

Active Publication Date: 2022-04-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polarizing films (ultimately, polarizers) have a problem of durability in which optical characteristics are degraded in a high-temperature, high-humidity environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] A long amorphous isophthalic acid-copolymerized polyethylene terephthalate film (thickness: 100 μm) having a water absorption rate of 0.60%, a Tg of 80° C., and an elastic modulus of 2.5 GPa was used as the resin base material.

[0107] Corona treatment is performed on one side of the resin substrate (treatment conditions: 55W·min / m 2 ), and at normal temperature on this corona treatment face coating contains 90 weight parts of polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mole %), the acetoacetyl modified PVA of 10 weight parts (polymerization degree 1200, The modification degree of acetoacetyl group is about 5%, the degree of saponification is more than 99.0 mol%, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200"), and the aqueous solution of potassium iodide of 13 parts by weight, placed in 60 ℃ environment and dried, A PVA-based resin layer with a thickness of 13 μm was formed to produce a laminate...

Embodiment 2

[0119] The thickness of the adhesive layer is set to 50 μm, and the moisture permeability is set to 12 g / m 2 / 24hr, except that, it carried out similarly to Example 1, and produced the polarizing plate. The obtained polarizing plate 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 polarizing plate in which discoloration in the absorption axis direction is significantly suppressed in a high-temperature, high-humidity environment. The polarizing plate of this invention has a polarizing film, a protective film, and an adhesive layer. The polarizing film is composed of an iodine-containing polyvinyl alcohol-based resin film, and the thickness of the polarizing film is 8 μm or less. The adhesive layer is disposed adjacent to the polarizing film, and the moisture permeability of the adhesive layer is 300 g / m 2 / 24hr or less. After the polarizing plate of the present invention is kept in an environment of 85° C. and 85% RH for 120 hours, the amount of discoloration in the direction of the absorption axis of the polarizing film is 100 μm or less.

Description

technical field [0001] The present invention relates to polarizers. Background technique [0002] In a liquid crystal display device, which is a typical image display device, polarizing films are arranged on both sides of a liquid crystal cell due to its image forming method. As a method for producing a polarizing film, for example, a method has been proposed in which a laminate having a resin base material and a polyvinyl alcohol (PVA) resin layer is stretched, and then dyed to obtain a polarizing film on the resin base material (e.g. Patent Document 1). According to this method, since a thinner polarizing film can be obtained, it can contribute to the reduction in thickness of image display devices in recent years, and thus attracts attention. However, a polarizing film (ultimately a polarizing plate) has a problem of durability in which optical characteristics are lowered in a high-temperature, high-humidity environment. More specifically, in a high-temperature, high-h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C09J7/24C09J123/22C09J201/00
CPCC09J7/24C09J123/22C09J201/00G02B5/30
Inventor 后藤周作泽崎良平森崎真由美
Owner NITTO DENKO CORP
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