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Polarizing element, polarizing plate using same and liquid crystal display device

A technology of polarizing element and light transmittance, applied in optical elements, polarizing elements, optics, etc., can solve the problem of not being able to adjust the color and so on, and achieve the effect of high light transmittance and high contrast

Active Publication Date: 2019-04-26
NIPPON KAYAKU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since there are only two kinds of dichroic pigments that absorb 480nm and 600nm through the complex of iodine and PVA, the iodine-based polarizer made of iodine and PVA cannot adjust the hue.

Method used

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  • Polarizing element, polarizing plate using same and liquid crystal display device
  • Polarizing element, polarizing plate using same and liquid crystal display device
  • Polarizing element, polarizing plate using same and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0255] A polyvinyl alcohol film (VF-PS manufactured by Kuraray Co., Ltd.) with an average degree of polymerization of 99% or higher and an average degree of polymerization of 2400 was immersed in warm water at 45° C. for 2 minutes, and subjected to swelling treatment with an elongation ratio of 1.30 times. Containing 1500 parts by mass of water, 1.5 parts by mass of sodium tripolyphosphate, 1.5 parts by mass of anhydrous sodium sulfate, 0.32 parts by mass of compound example [1a-25] as a compound of formula (1a), 0.20 parts by mass of compound example [2-4] The swollen membrane was immersed in a 45° C. dyeing solution in parts by mass for 4 minutes and 30 seconds to make the membrane contain an azo compound. The obtained membrane was immersed in a 40° C. aqueous solution containing 20 g / l of boric acid (manufactured by Societa Chimica Larderello s.p.a., Italy) for 1 minute. The dipped film was stretched for 5 minutes in a 50° C. aqueous solution containing 30.0 g / l of boric ac...

Embodiment 2

[0257] In addition to using 1500 parts by mass of water, 1.5 parts by mass of sodium tripolyphosphate, and 1.5 parts by mass of anhydrous sodium sulfate, the compound example [1a-25] as a compound of formula (1a) is 0.32 parts by mass, as described in formula (2). The C.I. direct blue 69 of the compound is 0.22 parts by mass to replace the dyeing solution used in Example 1, and the rest are operated in the same manner as in Example 1 to make a polarizing plate.

Embodiment 3

[0259] In addition to using 1500 parts by mass of water, 1.5 parts by mass of sodium tripolyphosphate, and 1.5 parts by mass of anhydrous sodium sulfate, the compound example [1a-25] as a compound of formula (1a) is 0.32 parts by mass, as described in formula (2). The compound example [2-4] of the compound is 0.20 mass parts, the compound example [3-1] as the formula (3) compound is 0.27 mass parts to replace the used dyeing solution of embodiment 1, all the other and embodiment 1 A polarizing plate was produced in the same manner.

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Abstract

The purpose of the present invention is to provide: a polarizing element which has high transmittance and high degree of polarization; a polarizing plate which uses this polarizing element; and a liquid crystal display device. The present invention provides the polarizing element which contains: an azo compound represented by formula (1a) or (1b) or a salt thereof; and an azo compound representedby formula (2) or a salt thereof.

Description

technical field [0001] The invention relates to a dye-based polarizing element, a polarizing plate and a liquid crystal display device using the polarizing element. Background technique [0002] A polarizing element is generally produced by adsorbing iodine or a dichroic dye to which a dichroic dye is aligned on a polyvinyl alcohol-based resin film. Here, the polarizing element is used in a liquid crystal display device or the like by bonding a polarizing plate obtained by bonding a protective film made of triacetyl cellulose or the like through an adhesive layer. A polarizing plate using iodine as a dichroic dye is called an iodine-based polarizing plate. On the other hand, a polarizing plate using a dichroic dye such as an azo compound having dichroism as a dichroic dye is called a dye-based polarizing plate. polarizer. Among them, the dye-based polarizing plate has high heat resistance, high humidity and heat durability, and high stability, and has the characteristics o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C09B67/22G02F1/1335
CPCG02B5/30G02F1/1335G02B1/04
Inventor 望月典明樋下田贵大服部由侑中村光则
Owner NIPPON KAYAKU CO LTD