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Composition for anisotropic pigmented film, anisotropic pigmented film, and polarizing element

An anisotropic and polarizing element technology, applied in optical elements, polarizing elements, nonlinear optics, etc., can solve the problem of increased drying deformation, difficulty in combining high coating uniformity and productivity with high dichroism, dichroism Lowering and other issues

Active Publication Date: 2008-06-25
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these dichroic pigment films have a disadvantage of low dichroism
Regarding this point, the characteristic linear (schlieren) defect of liquid crystal as also described in these documents is a problem, and there is also a problem that, in the film-forming process of the pigment film based on the wet film-forming method, due to the coating film Defects or cracks in the film caused by drying deformation during drying also cause light leakage, resulting in a decrease in dichroism
[0006] On the other hand, when the anisotropic pigmented film is formed by a wet film-forming method, it is preferable to reduce the solid content concentration of the pigment in the composition for the anisotropic pigmented film to improve the film thickness uniformity of the coating film and improve productivity, However, if the solid content concentration is lowered, the above-mentioned drying deformation tends to increase, which instead leads to a decrease in dichroism.
[0007] Due to these problems, it has been difficult to combine high coating uniformity and productivity with high dichroism in forming an anisotropic pigment film.

Method used

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  • Composition for anisotropic pigmented film, anisotropic pigmented film, and polarizing element
  • Composition for anisotropic pigmented film, anisotropic pigmented film, and polarizing element
  • Composition for anisotropic pigmented film, anisotropic pigmented film, and polarizing element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] 20 parts of the lithium salt of the dye No. (I-1) exemplified above were stirred and dissolved in 80 parts of water, and filtered to obtain a composition for anisotropic dye film.

[0164] For this anisotropic pigment film composition, the relaxation modulus G measured at a temperature of 5° C. for 0.01 seconds after straining was 9.2×10 1 dyn / cm 2 , the time taken for the relaxation modulus G to decrease to one-tenth is 0.04 seconds, which is shorter than 0.1 seconds.

[0165] A polyimide alignment film (thickness about 800 Ȧ) is formed on a glass substrate (75 mm x 25 mm, thickness 1 mm) by screen printing, and the substrate is rubbed with a cloth in advance to prepare such a substrate in advance. , the above-mentioned composition for anisotropic pigment film was coated on it using a coater with a gap of 2 μm (four-sided coater manufactured by Imoto Manufacturing Co., Ltd.), and then dried in a vacuum to obtain an anisotropic dye film with a film thickness of 0.4 μm....

Embodiment 2

[0168] 30 parts of the lithium salt of the dye No. (II-1) exemplified above and 1 part of 4,5,6-triaminopyrimidine sulfate (manufactured by Tokyo Chemical Industry Co., Ltd.) were stirred and dissolved in 69 parts of water, and filtered to obtain anisotropic Composition for pigmented film.

[0169] For this anisotropic pigment film composition, the relaxation modulus G measured at 5° C. for 0.01 seconds after deformation was applied by the above-mentioned method was 1.8×10 4 dyn / cm 2 , the time taken for the relaxation modulus G to decrease to one-tenth is 0.05 seconds, which is shorter than 0.1 seconds.

[0170] This composition for an anisotropic dye film was coated on the same board|substrate as Example 1 by the same method as Example 1, and the anisotropic dye film was obtained.

[0171] Defects and cracks were not observed on the obtained anisotropic dye film. And the dichroic ratio at a wavelength of 550 nm was 30.

Embodiment 3

[0173] In 78.94 parts of water, stirring and dissolving 15 parts of the lithium salt of the pigment No. (I-1) exemplified above through desalting and refining, 5 parts of the 80 mol% lithium neutralization salt of the pigment No. (I-1) exemplified above, 1 part of Alizarin Red S manufactured by Aldrich and 0.06 part of lithium chloride after desalination and refinement were filtered, and the composition for anisotropic pigment films was obtained.

[0174] For this anisotropic pigment film composition, the relaxation modulus G measured at a temperature of 5° C. for 0.01 seconds after straining was 9.9×10 1 dyn / cm 2 , the time for the relaxation modulus G to decrease to one-tenth is 0.04 seconds, which is shorter than 0.1 seconds.

[0175] This composition for an anisotropic dye film was coated on the same board|substrate as Example 1 by the same method as Example 1, and the anisotropic dye film was obtained.

[0176] Defects and cracks were not observed on the obtained anisot...

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Abstract

An anisotropic dye film that exhibits a high dichroism and a high uniformity in a coating film is formed at a high level of productivity. In the composition for an anisotropic dye film containing a dye and being capable of forming a lyotropic liquid crystal phase, the time until the relaxation modulus G measured 0.01 seconds after the application of strain drops to 1 / 10 is equal to or shorter than 0.1 seconds at a temperature of 5°C. The composition contains a cation and a strongly acidic anion that respectively account for contents in the range of 0.9 to 0.99 equivalence and in the range of 0.02 to 0.1 equivalence relative to the content of the acidic groups of the dye. An anisotropic dye film is formed using this composition for an anisotropic dye film. A polarizing element is formed using this anisotropic dye film.

Description

technical field [0001] The present invention relates to a composition for anisotropic pigment film, an anisotropic pigment film formed using the composition for anisotropic pigment film, and a polarizing element using the anisotropic pigment film. The composition can form a highly dichroic anisotropic dye film which is useful for a polarizing film included in a display element of a light-adjusting element, a liquid crystal element (LCD), or an organic electroluminescent element (OLED). Background technique [0002] In LCDs, linear polarizers or circular polarizers are used to control optical rotation or birefringence during display. Circular polarizers are also used in OLEDs to prevent light reflection of external light. Conventionally, iodine has been widely used as a dichroic substance in such a polarizing plate (polarizing element). However, since iodine has a high sublimation property, when iodine is used for a polarizing plate, its heat resistance and light resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCC09K19/60G02B5/3016C09K19/02G02B5/30G02F1/1335
Inventor 长谷川龙一佐野秀雄大泉淳一门脇雅美
Owner MITSUBISHI RAYON CO LTD
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