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Xanthene dye for color filter, and color filter using said dye

A color filter and pigment technology, which is applied in the directions of instruments, optical filters, benzoxanthamine/xanthone/thioxanthone/selenoxanthone/tellurium xanthone dyes, etc. Solve the problems of deterioration of display contrast, transparency, and improvement of color purity of color liquid crystal display devices, and achieve the effect of high heat resistance and excellent solubility

Active Publication Date: 2015-03-11
HODOGOYA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known that the display contrast of a color liquid crystal display device deteriorates due to the depolarization effect of a color filter using a pigment.
In addition, since pigments are generally insoluble in solvents, they need to be formed into fine particles and dispersed in dispersion liquids such as resins. However, the fine particles cause light scattering, and there are problems in improving transparency and color purity.

Method used

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  • Xanthene dye for color filter, and color filter using said dye
  • Xanthene dye for color filter, and color filter using said dye
  • Xanthene dye for color filter, and color filter using said dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The embodiments of the present invention will be specifically described below through examples, but the present invention is not limited to the following examples.

[0057] [Synthesis of xanthene pigments]

[0058] Add 500 g of C.I. Acid Red 289 (purity 85%), 3.0 L of water, and 150 mL of toluene to a reaction vessel, and heat to 80° C. to dissolve C.I. Acid Red 289. A mixed solution of 209 g of dodecyl ethanolamine, 94 g of concentrated hydrochloric acid, and 1.5 L of water was added to this solution, and stirred at 80° C. for 1 hour. After removing the solution portion by decantation, adding 4.0 L of water, and stirring at 80° C. for 30 minutes, the operation of adding 1.7 L of methanol and 1.0 L of toluene to the residue was repeated twice, followed by stirring at 50° C. for 1 hour. After removing the insoluble matter by filtration, the solvent was distilled off under reduced pressure to obtain 545 g (yield 99%) of a xanthene-based dye (C-1) represented by the follo...

Embodiment 2

[0061] [evaluation of pigment]

[0062] The obtained xanthene pigment (C- 1) Decomposition initiation temperature and solubility in PGME at 25° C. under normal pressure, and the measurement results are summarized in Table 1.

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Abstract

[Problem] To provide: a xanthene dye for a color filter, which has excellent solubility in an organic solvent and high heat resistance; and a color filter produced using the dye. [Solution] A color filter is constituted using a xanthene dye for a coloring agent for a red color filter, wherein the xanthene dye is represented by general formula (1).

Description

technical field [0001] The present invention relates to a dye for a color filter and a color filter using the same, and particularly to a red-based dye having high heat resistance and excellent solubility in an organic solvent, and a color filter using the same. Background technique [0002] In liquid crystal or electroluminescent (EL) display devices, color filters are sometimes used. A color filter is manufactured by laminating a colored layer on a light-transmitting substrate such as glass by a dyeing method, a pigment dispersion method, a printing method, an electrodeposition method, or the like. Materials used for the colored layer are roughly classified into pigments and dyes, and generally, pigments excellent in heat resistance and light resistance are widely used (for example, Patent Document 1). However, it is known that the display contrast of a color liquid crystal display device deteriorates due to the depolarization effect of a color filter using a pigment. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20
CPCG02B5/223C09B11/28G02B5/20
Inventor 服部良和山田英祐村冈泰斗铃木规敏
Owner HODOGOYA CHEMICAL CO LTD