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Polarizing element and polarizing plate

A technology of polarizing element and polarizing plate, applied in the field of dye-based polarizing element and polarizing plate, can solve the problems of low transmittance and low contrast of dye-based polarizing plate, and achieve the effect of improving optical properties and improving durability

Inactive Publication Date: 2014-04-30
NIPPON KAYAKU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dye-based polarizing plate has high heat resistance, high humidity and heat durability, high stability, and has the characteristics of high selectivity of color based on compounding. On the other hand, in the same polarization degree Compared with the polarizers of iodine-based polarizers, dye-based polarizers have the problem of low transmittance, that is, low contrast

Method used

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  • Polarizing element and polarizing plate
  • Polarizing element and polarizing plate
  • Polarizing element and polarizing plate

Examples

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Embodiment

[0331] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by these examples. In addition, the evaluation of the transmittance shown in an Example was performed as follows.

[0332] The respective transmittances were measured using a spectrophotometer ["U-4100" manufactured by Hitachi, Ltd.].

[0333] When the transmittance is measured using a spectrophotometer [manufactured by Hitachi, Ltd. "U-4100"], the transmittance after correction of the sensitivity based on JIS-Z8701 (C light source 2° field of view) is set on the light emitting side to 43 % and an iodine-based polarizer (SKN-18043P manufactured by Polatechno Co., Ltd.) with a polarization degree of 99.99%, so that absolutely polarized light can enter the measurement sample. The protective layer of the iodine-based polarizing plate at this time is triacetyl cellulose which does not have ultraviolet absorbing ability.

[0334] Absolutely polar...

Synthetic example 1

[0339] [Synthesis Example 1] Synthesis of Compound Example 12

[0340] Add 20.3 parts of 2-amino-5-methoxybenzenesulfonic acid to 500 parts of water, dissolve with sodium hydroxide, cool to below 10°C, add 32 parts of 35% hydrochloric acid, and then add 6.9 parts of sodium nitrite, Stir at 5°C to 10°C for 1 hour. Add 13.7 parts of 2,5-dimethylaniline dissolved in dilute hydrochloric acid water to it, while stirring at 30°C to 40°C, add sodium carbonate to make the pH to 3, further stir to complete the coupling reaction, and filter , to obtain monoazo compounds. To the obtained monoazo compound were added 32 parts of 35% hydrochloric acid, and then 6.9 parts of sodium nitrite, and stirred at 25°C to 30°C for 2 hours. Add 12.1 parts of 2,5-dimethylaniline dissolved in dilute hydrochloric acid water to it, while stirring at 20°C to 30°C, add sodium carbonate to make the pH to 3, further stir to complete the coupling reaction, and filter , to obtain diazo compounds. Disperse 1...

Synthetic example 2

[0341] [Synthesis Example 2] Synthesis of Compound Example 14

[0342] Change 6-(4′-aminobenzoyl)amino-3-sulfonic acid-1-naphthol (common name: aminobenzoyl J acid) in [Synthesis Example 1] to 6-(4′-benzoyl Except for acylphenyl) amino-3-sulfonic acid-1-naphthol (common name: benzoyl acid), it was synthesized in the same manner, and the trisazo compound shown in Compound Example 14 was obtained as a sodium salt.

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Abstract

To provide a polarizing element and a polarizing plate which have improved optical characteristics and durability. A polarizing element which is characterized by being formed of a stretched polyvinyl alcohol resin film that adsorbs, as a free acid, at least one dichroic dye that is a compound represented by formula (I) or a salt thereof and which is also characterized in that the polyvinyl alcohol resin has a polymerization degree of from 5,000 to 10,000. (In the formula, A represents a substituted phenyl group or a naphthyl group; each of R1-R6 independently represents a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group, a sulfo group or a lower alkoxy group having a sulfo group; X represents an optionally substituted amino group, an optionally substituted benzoylamino group, an optionally substituted phenylamino group, an optionally substituted phenylazo group or an optionally substituted naphthotriazole group; and m represents 0 or 1.)

Description

technical field [0001] The present invention relates to dye-based polarizing elements and polarizers. 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 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, the dye-based polarizing plate has high heat resistance, high humidity and heat durability, high stability, and has the characteristics of high selectivity of color based on compounding. On the other hand, in the same polarization degree Compared with the polarizing pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/30C09B31/30G02F1/1335
CPCB32B23/08B32B2307/306B32B27/30B32B7/12B32B2307/516C09B31/30B32B2307/706C09B45/28B32B2250/40B32B2250/24C09B56/08B32B2457/202C09B31/22B32B27/18B32B23/20C09B31/16B32B27/306B32B2250/03B32B2307/714B32B2307/412B32B2307/42C09B56/04G02F1/1335B32B2307/4026B32B2551/00G02B5/30G02F1/133528G02B5/3033G02B1/00G02B1/08
Inventor 望月典明
Owner NIPPON KAYAKU CO LTD
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