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Dye compositions for anisotropic dye films, anisotropic dye films and polarizing elements

Inactive Publication Date: 2006-10-19
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It is an object of the present invention to provide a dye composition for an anisotropic dye film capable of forming an anisotropic dye film which has good heat resistance, has little defects and shows high dichroism, an anisotropic dye film formed by using such a dye composition for an anisotropic dye film, and a polarizing elements employing such an anisotropic dye film.
[0025] According to the present invention, an anisotropic dye film is provided which has good heat resistance, has little defects and shows high dichroism, and by such an anisotropic dye film, a polarizing element is provided which is excellent in heat resistance and light fastness and which is excellent also in polarizing performance.

Problems solved by technology

However, iodine is highly sublimable and thus has had a drawback that when it is used for a polarizing film, its heat resistance or light fastness is inadequate.
However, conventional organic dye films have had a problem such that only dye films or polarizing elements are obtainable which are substantially inferior in dichroism as compared with ones employing iodine.

Method used

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  • Dye compositions for anisotropic dye films, anisotropic dye films and polarizing elements
  • Dye compositions for anisotropic dye films, anisotropic dye films and polarizing elements
  • Dye compositions for anisotropic dye films, anisotropic dye films and polarizing elements

Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0132] 5 Parts of Dye No. (II-1) and 2.5 parts of L-(+)lysine monohydrochloride (number of basic groups: 2, number of acidic groups: 1) (manufactured by Tokyo Kasei Kogyo Co., Ltd.) were added to 92.5 parts of water (molar ratio of the dye to L-(+)lysine monohydrochloride=1:1), stirred and dissolved, followed by filtration to obtain a dye composition for an anisotropic dye film of the present invention having a pH of 7. The above dye composition for an anisotropic dye film was applied by an applicator having a gap of 10 μm (manufactured by Imoto Seisakusho) on a glass substrate having a polyimide oriented film formed on its surface by a spin coating method (75 mm×25 mm, thickness: 1.1 mm, a polyimide oriented film having a polyimide film thickness of about 800 Å was preliminarily subjected to rubbing treatment with cloth), followed by drying naturally to obtain an anisotropic dye film having a thickness of about 0.4 μm.

[0133] A photograph of defects of the obtained anisotropic dye ...

example 1-2

[0135] 14 Parts of the above exemplified Dye No. (II-2) and 3.1 parts of L-(+)lysine monohydrochloride (number of basic groups: 2, number of acidic groups: 1) (manufactured by Tokyo Kasei Kogyo Co., Ltd.) were added to 82.9 parts of water (molar ratio of the dye to L-(+)lysine monohydrochloride=1:1), stirred and dissolved, followed by filtration to obtain a dye composition for an anisotropic dye film of the present invention having a pH of 7. This dye composition for an anisotropic dye film was applied on the same substrate as in Example 1-1 under the same conditions to obtain an anisotropic dye film having a thickness of about 0.9 μm.

[0136] A photograph of defects of the obtained anisotropic dye film is shown in FIG. 1. Further, the maximum absorption wavelength (λmax) and the dichroic ratio (D) of the obtained anisotropic dye film are shown in Table 1.

[0137] Defects of the anisotropic dye film obtained in this Example were sufficiently little, and the film had a high dichroic ra...

example 1-3

[0138] 15 Parts of the above exemplified Dye No. (II-3) and 3.3 parts of L-(+)lysine monohydrochloride (number of basic groups: 2, number of acidic groups: 1) (manufactured by Tokyo Kasei Kogyo Co., Ltd.) were added to 81.7 parts of water (molar ratio of the dye to L-(+)lysine monohydrochloride=1:1), stirred and dissolved, followed by filtration to obtain a dye composition for an anisotropic dye film of the present invention having a pH of 7. This dye composition for an anisotropic dye film was applied to the same substrate as in Example 1-1 under the same conditions to obtain an anisotropic dye film having a thickness of about 0.9 μm.

[0139] A photograph of defects of the obtained anisotropic dye film is shown in FIG. 1. Further, the maximum absorption wavelength (λmax) and the dichroic ratio (D) of the obtained anisotropic dye film are shown in Table 1.

[0140] Defects of the anisotropic dye film obtained in this Example were sufficiently little, and the film had a high dichroic ra...

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Abstract

To provide a dye composition for an anisotropic dye film, capable of forming an anisotropic dye film which has good heat resistance, has little defects and shows high dichroism; an anisotropic dye film formed by using such a composition for an anisotropic dye film; and a polarizing element employing such an anisotropic dye film.

Description

TECHNICAL FIELD [0001] The present invention relates to dye compositions for anisotropic dye films capable of forming anisotropic dye films showing high dichroism, which are useful for e.g. polarizing plates provided on display devices such as light control devices, liquid crystal devices (LCD) or organic electroluminescence devices (OLED), anisotropic dye films formed by using such dye compositions for anisotropic dye films, and polarizing elements employing such anisotropic dye films. BACKGROUND ART [0002] In LCD, linear polarizers or circular polarizers are used to control optical rotation or birefringence in display. Also in OLED, circular polarizers are used to prevent reflection of outside light. Heretofore, for such polarizers (polarizing elements), iodine has been widely used as a dichroic material. However, iodine is highly sublimable and thus has had a drawback that when it is used for a polarizing film, its heat resistance or light fastness is inadequate. [0003] Therefore...

Claims

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Application Information

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IPC IPC(8): D06P3/82G02B5/30
CPCG02B5/305G02B5/30C09B31/22
Inventor HASEGAWA, RYUICHIOIZUMI, JUNICHIKADOWAKI, MASAMIYONEYAMA, TOMIOSANO, HIDEO
Owner MITSUBISHI CHEM CORP
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