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

A dye composition, anisotropic technology, applied in the direction of polarizing elements, azo dyes, organic dyes, etc., can solve the problems of insufficient heat resistance or light resistance, poor yield of bonded anisotropic dye film, etc.

Active Publication Date: 2006-11-22
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional anisotropic dye film produced in this way has problems of insufficient heat resistance or light resistance depending on the dye or polymer material used; Membrane yield is poor
[0016] However, the above-mentioned compound is a disazo compound, and a halogen atom is bonded to the triazine ring, so it is easy to decompose

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0278] Under stirring, 10 parts of dyes (I-31) exemplified below and 0.2 parts of nonionic surfactant EMULGEN 109P (produced by Kao Corporation) were dissolved in 89.8 parts of water to obtain a dye composition for anisotropic dye film:

[0279]

[0280] On the other hand, prepare a base material, this base material comprises glass base material (75mm * 25mm, thickness 1mm) and polyimide alignment film (polyimide film thickness: about 800 Ȧ) formed on it by silk printing , and pre-rubbed with a cloth. On the substrate thus prepared, the aforementioned dye composition for anisotropic dye film was coated with a bar coater ("No. 3" manufactured by Tester Sangyo Co., Ltd.), followed by natural drying to obtain a film thickness of about An anisotropic dye film of 0.4 μm.

[0281] The X-ray diffraction curves and in-plane vibration curves of the obtained anisotropic dye films are shown in Figure 4 with Figure 5 middle. Figure 4 Shows the results of in-plane measurement fro...

Embodiment 2

[0285] Under stirring, 10 parts of the following exemplified dye (II-15) were dissolved in 90 parts of water to obtain a dye composition for anisotropic dye film:

[0286]

[0287] In the same manner as in Example 1 except using a bar coater (“No. 2” produced by Tester Sangyo Co., Ltd.), the glass substrate on which the polyimide alignment film was formed was coated with The dye composition for the anisotropic dye film was spread, followed by natural drying to obtain an anisotropic dye film.

[0288] The obtained anisotropic dye film was tested for its molecular lamination period, lamination length, orientation degree of molecular lamination axis, and dichromatic ratio, and the results are shown in Table 1.

[0289] Table 1 demonstrates that the anisotropic dye film of this example has a molecular arrangement suitable for expressing a dichroic ratio and has a high dichroic ratio.

Embodiment 3

[0291] Under stirring, 8 parts of the following exemplified dye (I-1) were dissolved in 92 parts of water to obtain a dye composition for anisotropic dye film:

[0292]

[0293] The anisotropic dye was coated on a glass substrate on which a polyimide alignment film was formed in the same manner as in Example 1, except that a coater (manufactured by Imoto Manufacturing Co., Ltd.) with a gap of 10 μm was used. The dye composition for the film, followed by natural drying, thereby obtaining an anisotropic dye film.

[0294] The obtained anisotropic dye film was tested for its molecular lamination period, lamination length, orientation degree of molecular lamination axis, and dichromatic ratio, and the results are shown in Table 1.

[0295] Table 1 demonstrates that the anisotropic dye film of this example has a molecular arrangement suitable for expressing a dichroic ratio and has a high dichroic ratio.

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Abstract

An anisotropic dye film having high dichromatic properties is provided. An anisotropic dye film wherein the period d attributable to molecular stacking is at most 3.445 AA, and the column length L thereof is at least 105 AA. The anisotropic dye film preferably has a degree of orientation of the molecular stacking axes of at least 85% and a film thickness of at most 30 m, and is formed by a wet film-forming method. Since it has a molecular alignment suitable to develop a dichroic ratio, it provides high dichromatic properties. A polarizing element having this anisotropic dye film is excellent in heat resistance, light fastness and polarizing performance.

Description

technical field [0001] The present invention relates to an anisotropic dye film having high dichroism, such as a polarizer used in a light control device, a liquid crystal device, and a display device of an organic electroluminescent device (OLED), the present invention It also relates to a polarizing element using the anisotropic dye film and a dye composition for an anisotropic dye film for obtaining the anisotropic dye film. In addition, the present invention relates to novel azo dyes for use in anisotropic dye films. Background technique [0002] For LCDs (Liquid Crystal Displays), linear polarizers or circular polarizers are used to control optical rotation and birefringence when displayed. Circular polarizers are also used for OLEDs to prevent external light reflections. [0003] Hitherto, for such a polarizer, an anisotropic dye film obtained by dissolving or adsorbing iodine or an organic dye having dichroism in a polymer material such as polyvinyl alcohol has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B31/20C09B31/30C09K19/60G02B5/30
Inventor 米山富雄长谷川龙一佐野秀雄大泉淳一西村政昭门脇雅美
Owner MITSUBISHI RAYON CO LTD
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