Coloring composition containing salt-forming compound constituted of cationic xanthene dye and organic anion, coloring agent for color filter, and color filter

A coloring composition, a technology of organic anions, applied in the directions of organic dyes, diphenoxamine/xanthone/thioxanthone/selenoxanthone/tellurium xanthone dyes, optical filters, etc. , which can solve the problems of low contrast, transparency, and color purity of color liquid crystal display devices.

Active Publication Date: 2020-06-02
HODOGOYA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the case of a color filter using a pigment, it is known that the transmitted light is reflected and scattered on the surface of the pigment particles in the color filter, so that transparency and color purity are affected, and also that there is a problem with reflection. Depolarization effect, so the contrast ratio of the color liquid crystal display device is reduced

Method used

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  • Coloring composition containing salt-forming compound constituted of cationic xanthene dye and organic anion, coloring agent for color filter, and color filter
  • Coloring composition containing salt-forming compound constituted of cationic xanthene dye and organic anion, coloring agent for color filter, and color filter
  • Coloring composition containing salt-forming compound constituted of cationic xanthene dye and organic anion, coloring agent for color filter, and color filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0338] For the salt-forming compound composed of a xanthene-based cationic dye (A-1) and an organic anion (B-1) obtained in Synthesis Example 4, a spectrophotometer (manufactured by Hitachi, Ltd., U-3000) UV-Vis absorption spectrometry was carried out. Assays were performed at room temperature using PGME as solvent. The maximum absorption wavelength in the visible light region was determined from the obtained ultraviolet-visible absorption spectrum. In addition, using a thermogravimetric measurement-differential thermal analysis device (manufactured by Mac Systems Co., Ltd., TG-DTA 2000S type), TG-DTA measurement was performed under a nitrogen stream (sample weight: 5 ± 1.5 mg, heating rate: 20°C / min) to determine the 5% weight loss temperature. Next, the solubility in a PGME solvent (PGME, 25±2° C.) at room temperature (25±2° C.) was measured. These measurement results are shown in Table 1.

[0339] 【Table 1】

[0340]

Embodiment 2～ Embodiment 5

[0342] For the salt-forming compounds obtained in Synthesis Example 5 to Synthesis Example 8, the visible absorption spectrum, 5% weight loss temperature, and solubility (PGME, 25±2° C.) were measured in the same manner as in Example 1. The measurement results are shown together with the results of Example 1 in Table 1.

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Abstract

This coloring composition: contains a salt-forming compound constituted of a cationic xanthene dye represented by general formula (1) and organic anions; serves as a coloring agent for a color filterhaving excellent hue adjustability for color gamut expansion; and provides a color filter having excellent chromogenic performance (color gamut, brightness, contrast ratio, and the like).

Description

technical field [0001] The present invention relates to a coloring composition containing a xanthene dye, a colorant for color filters using the composition, and a color filter using the colorant. Background technique [0002] In liquid crystal and electroluminescent (EL) display devices, color filters are sometimes used. A color filter is produced by laminating a colored layer on a translucent substrate such as glass by a dyeing method, a pigment dispersion method, a printing method, an electrodeposition method, or the like. Colorants used in colored layers are broadly classified into pigments and dyes, and generally, pigments excellent in heat resistance and light resistance are widely used (for example, refer to Patent Documents 1 to 3). However, since pigments are generally insoluble in solvents, they exist in the form of fine particles in color filters containing resins and the like. Therefore, in the case of a color filter using a pigment, it is known that the transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B69/06C09B11/28G02B5/20
CPCC09B11/28C09B69/06G02B5/20
Inventor 大熊宽史铃木规敏青木良和
Owner HODOGOYA CHEMICAL CO LTD
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