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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 problem of poor dichroism and achieve good heat resistance

Active Publication Date: 2007-02-07
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional organic dye films have a problem in that only dye films or polarizing elements that are far inferior in dichroism to dye films or polarizing elements using iodine can be obtained.

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

Embodiment 1-1

[0152] 5 parts of dye (II-1) and 2.5 parts of L-(+) lysine monohydrochloride (number of basic groups: 2; number of acidic groups: 1) (manufactured by Tokyo Chemical Industry Co., Ltd.) were added to In 92.5 parts of water (the molar ratio of dyestuff and L-(+) lysine monohydrochloride is 1: 1), stir and dissolve, then filter, obtain the dyestuff for anisotropic dyestuff film of the present invention that pH is 7 combination. Form the glass substrate (75mm * 25mm, thickness: 1.1mm) of polyimide alignment film with spin-coating method on the surface, have the polyimide alignment film of the polyimide film of about 800 Ȧ in advance with cloth. rubbing treatment), the above-mentioned dye composition for anisotropic dye film was coated with a coater (produced by Imoto Manufacturing Co., Ltd.) with a gap of 10 μm, followed by natural drying to obtain an anisotropic dye film with a thickness of about 0.4 μm .

[0153] Photographs of defects in the resulting anisotropic dye film are...

Embodiment 1-2

[0156] 14 parts of above-exemplified dyes (II-2) and 3.1 parts of L-(+) lysine monohydrochloride (number of basic groups: 2; number of acid groups: 1) (by Tokyo Chemical Industry Co., Ltd. production) was added to 82.9 parts of water (the molar ratio of dye to L-(+) lysine monohydrochloride was 1:1), stirred and dissolved, followed by filtration to obtain the anisotropic compound of the present invention with a pH of 7. Dye composition for dye film. The dye composition for an anisotropic dye film was coated 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.

[0157] Photographs of defects in the resulting anisotropic dye film are shown in figure 1 middle. And, the maximum absorption wavelength (λ max ) and its dichroic ratio (D) are shown in Table 1.

[0158] The anisotropic dye film obtained in this example has very few defects, the film has a high dichroic ratio (light absorption anisotr...

Embodiment 1-3

[0160] With 15 parts of above-exemplified dyes (II-3) and 3.3 parts of L-(+) lysine monohydrochloride (number of basic groups: 2; number of acidic groups: 1) (by Tokyo Chemical Industry Co., Ltd. production) was added to 81.7 parts of water (the molar ratio of dye to L-(+) lysine monohydrochloride was 1:1), stirred and dissolved, followed by filtration to obtain the anisotropic anisotropic compound of the present invention with a pH of 7. Dye composition for dye film. The dye composition for an anisotropic dye film was coated 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.

[0161] Photographs of defects in the resulting anisotropic dye film are shown in figure 1 middle. And, the maximum absorption wavelength (λ max ) and its dichroic ratio (D) are shown in Table 1.

[0162] The anisotropic dye film obtained in this example has very few defects, the film has a high dichroic ratio (light...

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Abstract

The invention provides a dye composition for anisotropic dye films which enables formation of an anisotropic dye film having proper heat resistance and few defects and exhibiting strong dichroism, and to provide an anisotropic dye film formed by using the dye composition for anisotropic dye films, and to provide and a polarizing element that uses the anisotropic dye film. The dye composition for anisotropic dye films contains a dye and a compound having two or more groups which are selected from among a group consisting of acidic groups, basic groups and neutral groups and include at least one basic group. There are also provided the anisotropic dye film formed by using the dye composition for anisotropic dye films and the polarizing element employing the anisotropic dye film.

Description

technical field [0001] The present invention relates to a dye composition for an anisotropic dye film, an anisotropic dye film formed using the dye composition for an anisotropic dye film, and a polarizing element using the anisotropic dye film. A dye composition for a dye film capable of forming an anisotropic dye film with high dichroism for use in, for example, a light control device, a liquid crystal device (LCD), or an organic electroluminescent device (OLED) Polarizing plates on display devices, etc. Background technique [0002] In an LCD, a linear polarizing plate or a circular polarizing plate is used to control optical rotation or birefringence at the time of display. Circular polarizing plates are also used in OLEDs to prevent light reflection from the outside. Up to now, for such a polarizing plate (polarizing element), iodine has been widely used as a dichroic substance. However, since iodine has high sublimation property, it has a disadvantage that heat resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/305G02B5/30C09B31/22
Inventor 长谷川龙一大泉淳一门脇雅美米山富雄佐野秀雄
Owner MITSUBISHI RAYON CO LTD
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