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Coloring composition containing xanthene-based dye, coloring agent for color filter, and color filter

A technology for coloring compositions and color filters, applied in organic dyes, diphenoxanthamine/xanthone/thioxanthone/selenoxanthone/telloxanthone dyes, color lakes, etc. , can solve problems affecting transparency, color purity, and lower contrast ratio of color liquid crystal display devices, and achieve the effect of excellent color development

Active Publication Date: 2020-04-10
HODOGAYA KAGAKU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, thereby affecting transparency and color purity, and also having depolarization caused by reflection. function, so the contrast ratio of the color liquid crystal display device is reduced

Method used

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  • Coloring composition containing xanthene-based dye, coloring agent for color filter, and color filter
  • Coloring composition containing xanthene-based dye, coloring agent for color filter, and color filter
  • Coloring composition containing xanthene-based dye, coloring agent for color filter, and color filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] [Preparation of Powder of Coloring Composition]

[0166] Acid red 52 (150 g) represented by the following formula (A-3) and 1.2 L of methanol were put into a 3 L reaction vessel, dissolved at 50° C., and activated carbon (model: Egret A-2, hereinafter referred to as “ Egret") 7.5g, stirred for 1 hour. The reaction solution was filtered twice with filter paper (model: GF-75 manufactured by Advantec). The filtrate was concentrated, dissolved in 1.12 L of methanol at 50° C., 1.12 L of ethyl acetate was added, stirred for 3 hours, and then filtered. The filtrate was dried under reduced pressure at 60° C. for 24 hours to obtain a green crystal colored composition (104.4 g). The NMR analysis of this coloring composition was performed, and it confirmed that the components of organic solvents, such as methanol, were not observed.

[0167] [chemical 17]

[0168]

[0169] [Powder X-ray Diffraction Measurement]

[0170] The powder of the coloring composition obtained as de...

Embodiment 2

[0176] Acid red 52 (40 g) represented by the above formula (A-3) and 0.32 L of methanol were added to a 1 L reaction vessel, dissolved at 60° C., 2 g of activated carbon (type: Egret) was added, and stirred for 1 hour. The reaction solution was filtered twice at 50° C. with filter paper (type: GF-75 manufactured by Advantec). Move the filtrate to a square flat bottom plate (30cm×40cm), put it into a decompression desiccator, and dry it under reduced pressure under the conditions of temperature-heating time of 50°C-2 hours, 65°C-2 hours, and 80°C-20 hours , and a purple crystal-like coloring composition (40.3 g) was obtained. The NMR analysis of this coloring composition was performed, and it confirmed that the components of organic solvents, such as methanol, were not observed. For this coloring composition, powder X-ray diffraction and contrast ratio were measured in the same manner as in Example 1, and the results are shown in figure 1 and Table 1.

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Abstract

This coloring composition containing a xanthene-based dye is represented by general formula (1), and a coloring agent, which is for a color filter and contains the coloring composition containing thexanthene-based dye and having number of diffraction peaks of 0 in a range of 3-7 degrees of a diffraction angle (2[theta]) in a powder X-ray diffraction of CuK[alpha] radiation, provides a color filter having a high display contrast ratio.

Description

technical field [0001] The present invention relates to a coloring composition containing a xanthene dye, a coloring agent for color filters using the composition, and a color filter using the coloring agent. Background technique [0002] Color filters are sometimes used in liquid crystal, electroluminescent (EL) display devices. A color filter is produced by laminating colored layers 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 roughly classified into pigments and dyes, and generally, pigments considered to be 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 ...

Claims

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Application Information

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IPC IPC(8): C09B11/28C09B63/00C09B67/10C09B67/48G02B5/20
CPCC09B11/28C09B63/00G02B5/20
Inventor 青木良和神田大三山县直哉
Owner HODOGAYA KAGAKU IND
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