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Dye-Based Polarizers and Polarizers

A technology of polarizing elements and polarizers, which is applied in the direction of optical elements, polarizing elements, azo dyes, etc., can solve problems such as difficulties, increased requirements for improvement, and discoloration of polarizers, and achieve good dyeability and good polarizing properties.

Inactive Publication Date: 2016-08-24
NIPPON KAYAKU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the development of polarizing elements, it is very difficult to develop a technology that combines the polarizing function with color and durability on the premise of having high polarizing characteristics.
[0005] In addition, in recent years, the intensity of light sources for optical applications has increased, and there has been a problem of discoloration of polarizers due to the intense light and the accompanying heat, and the demand for improvement has increased.

Method used

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  • Dye-Based Polarizers and Polarizers
  • Dye-Based Polarizers and Polarizers
  • Dye-Based Polarizers and Polarizers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087]

[0088] A polyvinyl alcohol-based resin film (VF series manufactured by Kuraray Co., Ltd.) having a saponification degree of 99% or more and a film thickness of 75 μm was immersed in warm water at 40° C. for 2 minutes to perform swelling treatment. The film after the swelling treatment was salted out in a 20% by weight aqueous solution containing a pigment represented by formula (3) using 25% by weight of Sanuki salt (Sanuki salt), dried at 60°C, and dried The dye powder (HPLC purity 98.2%) was immersed in 45 degreeC aqueous solution containing 0.1 weight% of sodium tripolyphosphate at 0.05 weight%, and adsorption|suction of the dye was performed. The dye-adsorbed membrane was washed with water, and after washing, boric acid treatment was performed for 1 minute with a 40° C. aqueous solution containing 2% by weight of boric acid. The film obtained by the boric acid treatment was stretched 5.0 times, and treated in a 55° C. aqueous solution containing 3.0% by weight o...

Embodiment 2

[0092] In Example 1, 2-methoxyaniline was replaced by 2,5-dimethoxyaniline to prepare a pigment solution having a compound represented by formula (4), and polarized light was obtained by using pigment powder (HPLC purity 98.6%) A polarizing plate and an evaluation sample were produced in the same manner as the other elements. When the polarizing element obtained in Example 2 was dissolved and measured by HPLC, the purity of the dye represented by the formula (4) in the film was 98.8%.

Embodiment 3

[0094] The phenyl J acid used in Example 1 was replaced by methyl phenyl J acid to prepare a pigment solution having a compound represented by formula (5), and a polarizing element was obtained by using pigment powder (HPLC purity 97.8%). Otherwise, a polarizing plate and an evaluation sample were produced in the same manner. When the polarizing element obtained in Example 3 was dissolved and measured by HPLC, the purity of the dye represented by the formula (4) in the film was 97.2%.

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Abstract

The object of the present invention is to develop a polarizing element having excellent polarizing properties without using a raw material belonging to a specific chemical substance such as dianisidine, which is a pigment having an excellent blue dye. The polarizing element of the present invention is composed of a film stretched three times or more containing polyvinyl alcohol resin or a derivative thereof and a dichroic dye, wherein at least one of the dichroic dyes is represented by formula (1). The azo compound represented by formula (2) or its salt, and the content of the azo compound represented by formula (2) or its salt in the polarizing element is 10% or less. (In the formula (1), A represents a naphthyl group with a substituent, R represents a hydrogen atom or a methoxy group, and X represents a hydrogen atom, a hydroxyl group, a carboxyl group, a methyl group, a methoxy group, a sulfo group.) (Formula (2) Among them, A, R, and X represent the same meanings as A, R, and X shown in formula (1).)

Description

technical field [0001] The present invention relates to a dye-based polarizing element and a polarizing plate using the polarizing element. Background technique [0002] A polarizing element is generally produced by adsorbing iodine or a dichroic dye as a dichroic dye on a polyvinyl alcohol-based resin film and aligning it. A protective film made of triacetyl cellulose or the like is bonded to at least one side 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, and a polarizing plate using a dichroic dye as a dichroic dye is called a dye-based polarizing plate. Among them, if compared with iodine-based polarizers having the same degree of polarization, dye-based polarizers have the problem of low transmittance, that is, low contrast, but they have the following characteristics: high heat resistan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C09B45/28G02F1/1335
CPCC09B31/08C09B45/28G02B5/305
Inventor 望月典明
Owner NIPPON KAYAKU CO LTD
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