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Dye-based polarizing element or dye-based polarizing plate

A technology of polarizing elements and polarizers, applied in the direction of polarizing elements, azo dyes, organic dyes, etc., which can solve the problems of low contrast and low transmittance

Active Publication Date: 2016-04-20
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, dye-based polarizers have the characteristics of high heat resistance, high humidity and heat durability, high stability, and high selectivity of colors obtained by compounding. Compared with polarizers, there are problems such as low transmittance, that is, low contrast

Method used

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  • Dye-based polarizing element or dye-based polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075]

[0076] The bluish-green pigment obtained by the production method of Example 1 of Japanese Patent Publication No. 64-5623 was redissolved in a 20% by weight aqueous solution, and dried while spraying in an atmosphere of 200° C. to obtain a coppery pigment. Azo compound powder 1. Weigh 50 mg of powder 1 of copperized azo compound, add 0.1% by weight of trimethylolpropane as a known amount of internal standard substance, add N,O-bis(trimethylsilyl)trifluoroacetamide 200 microliter and 300 microliters of pyridine, and the treatment liquid after heating at 80° C. for 10 minutes was measured by gas chromatography (6890N manufactured by Agilent Co., Ltd.), and the content of monoethanolamine was confirmed from the obtained area value. 11000 parts by weight of the powder of the azo compound contains a pigment of 105 parts by weight of monoethanolamine.

[0077]

[0078]A polyvinyl alcohol film (VF-XS manufactured by KURARAY Co., Ltd.) having an average degree of polymer...

Embodiment 2

[0080] In the preparation of the dye of Example 1, in the dye drying step after redissolving in a 20% by weight aqueous solution, it was dried while being sprayed in an atmosphere of 105°C, and powder 2 of a copperized azo compound was obtained. , except that, the polarizing element of the present invention was produced in the same manner. The content of monoethanolamine in the obtained copperized azo compound powder 2 was 398 parts by weight of monoethanolamine relative to 21000 parts by weight of the copperized azo compound powder. In addition, the content of monoethanolamine in the obtained polarizing element was confirmed, and it was 61 ppm.

Embodiment 3

[0082] The polarizer of the present invention was obtained in the same manner except that the powder 1 of the copperized azo compound in Example 1 was changed to C.I. Direct Blue 199 containing 0.8% by weight of methylaminoethanol and 9.7% by weight of diethanolamine. element. Methylaminoethanol in the obtained polarizing element was not detected because it was below the measurement limit value, and diethanolamine was 8 ppm.

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Abstract

The invention relates to a dye-based polarizing element or a dye-based polarizing plate wherein there is no elution or precipitation of azo compounds even if moisture is retained due to a humidification process or a water immersion process. Provided is a polarizing element comprising a polyvinyl alcohol-based resin film that includes at least one kind of azo compound and has undergone a stretching process, said polarizing element being characterized in that the film contains no more than 70 ppm of an amine compound.

Description

technical field [0001] The present invention relates to a dye-based polarizing element or a dye-based polarizing plate in which no elution or precipitation of an azo compound occurs even when an aqueous treatment is performed by applying a humidification treatment or immersion treatment in water. Background technique [0002] A polarizing element is generally produced by adsorbing iodine or a dichroic dye as a dichroic dye on a polyvinyl alcohol resin film and aligning it. A protective film made of triacetyl cellulose or the like is bonded to at least one surface of the polarizing element via an adhesive layer to form a polarizing plate, which is used in a liquid crystal display device or the like. A polarizing plate using iodine as a dichroic dye is called an iodine-based polarizing plate, while a polarizing plate using a dichroic dye as a dichroic dye is called a dye-based polarizing plate. Among them, dye-based polarizers have the characteristics of high heat resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C09B45/28G02C7/10G02C7/12G02F1/1335
CPCC09B45/28G02B5/3033G02C7/10G02C7/12
Inventor 望月典明
Owner NIPPON KAYAKU CO LTD
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