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Polarizer and polarizing plate

A technology of polarizers and polarizers, applied in the field of polarizers and polarizers, can solve problems such as low heat resistance and easy changes in optical properties, and achieve excellent heat resistance

Pending Publication Date: 2020-11-06
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thinner the polarizer, the lower the heat resistance, and there is a problem that the optical characteristics are likely to change in a high-temperature environment.

Method used

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  • Polarizer and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] As the thermoplastic resin substrate, an amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyPET) 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 a coating containing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified polyvinyl alcohol in a ratio of 9:1 is applied on the corona treated surface at 25°C. Aqueous PVA (polymerization degree 1200, acetoacetyl group modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") is then dried to form PVA with a thickness of 11 μm. The resin-like layer was used to produce a laminated body.

[0074] The obtained 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 t...

Embodiment 2

[0083] The laminated body which has a polarizer was obtained similarly to Example 1 except having dried a laminated body in the oven of 30 degreeC in a 1st drying process and a 2nd drying process, respectively. The obtained polarizer had an iodine content of 18.8% by weight, a free boric acid content of 0.32% by weight, and a single transmittance of 39.9%. The obtained laminated body was subjected to the same evaluation as Example 1. The results are shown in Table 1.

Embodiment 3

[0085] The laminated body which has a polarizer was obtained similarly to Example 1 except having dried a laminated body in the oven of 40 degreeC in a 1st drying process and a 2nd drying process, respectively. The obtained polarizer had an iodine content of 18.6% by weight, a free boric acid content of 0.39% by weight, and a single transmittance of 39.9%. The obtained laminated body was subjected to the same evaluation as Example 1. The results are shown in Table 1.

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Abstract

Provided is a thin polarizer having a highly favorable heat resistance. A polarizer according to the present invention is configured from a polyvinyl alcohol-based resin film containing iodine, wherein the content of a free boric acid is 0.4 wt% or less.

Description

technical field [0001] The invention relates to a polarizer and a polarizer. Background technique [0002] In a liquid crystal display device which is a typical image display device, polarizers (substantially polarizing plates including polarizers) are arranged on both sides of a liquid crystal cell due to its image forming method. Typically, a polarizer can be produced by dyeing a polyvinyl alcohol (PVA)-based resin film with a dichroic substance such as iodine (for example, Patent Documents 1 and 2). In recent years, there has been an increasing demand for thinner image display devices. Therefore, further thinning is required also for polarizers. However, the thinner the polarizer, the lower the heat resistance, and there is a problem that the optical characteristics tend to change in a high-temperature environment. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent No. 5048120 [0006] Patent Document 2: Japanese Pate...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/30G02F1/1335G02B1/04G02B5/3033G02B1/14C08J5/18C08K3/02C08K3/38C08L29/04B32B7/023B32B27/18B32B27/306C08J2329/04
Inventor 猿桥友斗泽田浩明
Owner NITTO DENKO CORP
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