Polarizing element and polarizing plate

A polarizing element and polarizer technology, which is applied in the field of dye-based polarizing elements and polarizers, can solve the problems of low transmittance and low contrast of dye-based polarizers, and achieve the effect of improving optical characteristics and 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 the characteristics of high heat resistance, high humidity and heat durability, high stability, and high selectivity of color based on compounding. On the other hand, in the same polarization degree When comparing the polarizers of the dye-based polarizers, the dye-based polarizers have the problem of low transmittance (ie, low contrast) compared to the iodine-based polarizers

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0053] [Chem 3]

[0054]

[0055] [Compound Example 2]

[0056] [chemical 4]

[0057]

[0058] [Compound Example 3]

[0059] [chemical 5]

[0060]

[0061] [Compound Example 4]

[0062] [chemical 6]

[0063]

[0064] [Compound Example 5]

[0065] [chemical 7]

[0066]

[0067] The azo compound used as a pigment in the present invention can generally be synthesized according to a known azo dye synthesis method in the technical field (for example, "Dye Chemistry"; Toyo Hosoda; Gihodo; page 626). Diazotization, coupling to manufacture.

[0068] As a representative production method, 4-aminobenzoic acid is diazotized, and it is coupled with anilines represented by the following formula (where R 1 and R 2 represents the same meaning as in the case of the above-mentioned formula (I), and a monoazoamino compound of the following formula is obtained.

[0069] [chemical 8]

[0070]

[0071] [chemical 9]

[0072]

[0073] Next, after reacting the monoazo...

Embodiment 1

[0109] [Example 1] A polyvinyl alcohol-based resin film (VF series manufactured by KURARAY Corporation) with a film thickness of 40 μm, a degree of polymerization of 5500, and a degree of swelling of 232% with a degree of saponification of 99% or more was immersed in warm water at 30°C for 3 Minutes for swelling. The membrane after the swelling treatment was immersed in a 35° C. aqueous solution containing 0.3% by weight of the dye of Compound Example 1, 0.1% by weight of sodium tripolyphosphate, and 0.1% by weight of Glauber’s salt to adsorb the dye. The dye-adsorbed membrane was washed with water, and after washing, boric acid treatment was performed for 1 minute with a 20° C. aqueous solution containing 2% by weight of boric acid. The film obtained by the boric acid treatment was stretched 5.0 times, and was treated in an aqueous solution at 58° C. containing 3.0% by weight of boric acid for 5 minutes. The film obtained by this boric acid treatment was treated with water a...

Embodiment 2

[0113] Except that Compound Example 2 was used instead of Compound Example 1 used in Example 1, samples were prepared in the same manner to prepare measurement samples.

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Abstract

To provide a polarizing element and polarizing plate that exhibit improved optical properties and durability. A polarizing element comprising a film that contains a compound represented by formula (I) or a salt thereof, and a polyvinyl alcohol resin having a degree of polymerization that is 5000-10,000. (In the formula, R1-R4 each independently represents a hydrogen atom, a lower alkyl group, or a lower alkoxyl group, and n represents 1-3.)

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-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, 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 polarizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/30C09B33/18G02F1/1335
CPCB32B27/18B32B23/20B32B27/306B32B2250/03C09B45/28B32B2307/714B32B2307/306B32B23/08B32B2307/412G02B5/3033B32B2307/42B32B7/12C09B56/04B32B2307/516B32B2307/706B32B2250/40B32B2250/24B32B2307/4026C09B56/08B32B2551/00B32B2457/202G02F1/133528G02B5/305
Inventor 望月典明
Owner NIPPON KAYAKU CO LTD
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