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Trisazo dye, composition containing the same for anisotropic dye film, anisotropic dye film, and polarizing element

An anisotropic and trisazo technology, applied in the direction of trisazo dyes, polarizing elements, liquid crystal materials, etc., can solve the problem of not being able to display high dichroism, and achieve the effect of excellent contrast and excellent solubility

Inactive Publication Date: 2007-12-12
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, unlike the above-mentioned process of orientation by stretching treatment, this method requires the dye to have lyotropic liquid crystallinity formed by its own organization, so even if it is a dye that can be used for the polarizing film produced by the above-mentioned stretching treatment, It may not be suitable for wet film forming method
[0008] In addition, in Patent Documents 1 to 3, materials suitable for the process of the wet film-forming method are proposed. However, even if these materials are suitable for this process, there is a problem that high dichroism cannot be exhibited.

Method used

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  • Trisazo dye, composition containing the same for anisotropic dye film, anisotropic dye film, and polarizing element
  • Trisazo dye, composition containing the same for anisotropic dye film, anisotropic dye film, and polarizing element
  • Trisazo dye, composition containing the same for anisotropic dye film, anisotropic dye film, and polarizing element

Examples

Experimental program
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Effect test

Embodiment 1

[0142] After adding 10 parts of the sodium salt of dye No. (1-1) to 90 parts of water, stirring and dissolving, it filtered, and obtained the dye aqueous solution (composition for anisotropic dye membranes).

[0143] On the other hand, as a substrate, a glass substrate (75 mm × 25 mm, thickness 1.1 mm, polyimide polyimide film) with an orientation film of polyimide formed on a glass substrate was prepared. The polyimide alignment film having a film thickness of about 800 angstroms was previously rubbed with cotton cloth). The above-mentioned dye aqueous solution was coated (2500 rpm x 15 seconds) on the substrate with a spin coater (SC-200 produced by Oshisaki Co., Ltd.), and then dried naturally to obtain an anisotropic dye film in which the dye was oriented in the rubbing direction.

[0144] The light transmittance (Tz) of the obtained anisotropic dye film to the polarized light having a vibrating plane in the direction of the absorption axis in the dye film plane and the li...

Embodiment 2

[0146] Add 10 parts of lithium salt of dye No. (1-15) and 0.2 part of anionic surfactant (EMALGEN 109P; produced by Kao (Kao) Co., Ltd.) to 90 parts of water, stir and dissolve, then filter to obtain dye aqueous solution (isotropic Anisotropic dye film composition). The composition was coated on a substrate subjected to the same orientation treatment as the substrate used in Example 1 with a No. 3 bar coater (manufactured by Testa Industrial Co., Ltd.), and then dried naturally. Anisotropic dye film. The light transmittance (Tz) of the obtained anisotropic dye film to the polarized light with the vibration plane in the direction of the absorption axis and the light transmittance (Ty) to the polarized light with the vibration plane in the direction of the polarization axis in the plane of the dye film, the results are shown in Fig. 3. In addition, the degree of polarization (P%) with respect to each wavelength is shown in FIG. 4 . The dye film of the present invention has a ...

Embodiment 3

[0148] The aqueous dye solution prepared in Example 1 was injected into a quartz dish with an optical path length of 0.01mm, and after measuring the light transmittance in the visible wavelength range with a spectrophotometer (produced by Hitachi, U-3500), it passed JIS Z8701-1995 (CIE No.15.2) and the method specified in JIS Z8722-1994 to calculate the transmittance chromaticity under the D65 standard light source. In addition, dilute with distilled water so that the dye concentration (weight ratio) in the dye aqueous solution is 1000ppm, 10ppm, the 100ppm concentration aqueous solution is injected into the quartz dish with an optical path length of 0.1mm, and the 10ppm concentration aqueous solution is injected into a quartz dish with an optical path length of 10mm, Use the same method to calculate the transmittance chromaticity. See the C.I.E. chromaticity diagram in FIG. 5 for the trajectory of the chromaticity change under each concentration condition. The chromaticity l...

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Abstract

The present invention provides a trisazo dye, a composition for anisotropic dye film comprising the dye, an anisotropic dye fime and a polarizating element comprising the anisotropic dye film. The said dye for forming by a wet process an anisotropic dye film which is black and has a high degree of polarization and a high degree of molecular orientation. The dye, which is for forming an anisotropic dye film by a wet process, is a trisazo dye which in its free acid form is represented by the following general formula (1). In the formula, A<1> is an optionally substituted phenyl or aromatic heterocyclic group; B<1> is an optionally substituted aromatic hydrocarbon group; D<1> is an optionally substituted aromatic hydrocarbon or aromatic heterocyclic group; R1 is hydrogen, hydroxy, or optionally substituted amino; and m and n each is 0 or 1.

Description

technical field [0001] The present invention relates to an azo dye useful for an anisotropic dye film formed by a wet film-forming method, an anisotropic dye film using the same, and the like. In detail, the present invention is particularly concerned with trisazo dyes exhibiting high dichroism, which is useful for light adjustment elements and display elements of liquid crystal elements (LCD), organic electroluminescent elements (OLED) It is useful for anisotropic dye films such as polarizing plates, and also relates to a composition for anisotropic dye films, an anisotropic dye film, and a polarizing element using the dye. Background technique [0002] In LCDs, linear polarizers or circular polarizers are used to control the optical rotation and birefringence in the display, and in OLEDs, circular polarizers are also used to prevent reflection of external light. Conventionally, iodine has been often used as a dichroic substance in these polarizing plates (polarizing eleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B31/18C09K19/60G02B5/30
Inventor 佐野秀雄门脇雅美长谷川龙一米山富雄
Owner MITSUBISHI CHEM CORP
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