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
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[0164] [Example 1]
[0165] [Preparation of powder of coloring composition]
[0166] Put acid red 52 (150g) represented by the following formula (A-3) and 1.2L of methanol in a 3L reaction vessel, dissolve at 50°C, and add activated carbon (model: Egret A-2, hereinafter referred to as " "Egret") 7.5g, stirred for 1 hour. The reaction liquid was filtered twice with filter paper (model: GF-75 manufactured by ADVANTEC). The filtrate was concentrated and dissolved in 1.12 L of methanol at 50°C, then 1.12 L of ethyl acetate was added, stirred for 3 hours, and filtered. The filtrate was dried under reduced pressure at 60°C for 24 hours to obtain a green crystal-like colored composition (104.4 g). NMR analysis of the coloring composition was performed, and it was confirmed that no organic solvent components such as methanol were observed.
[0167] [化17]
[0168]
[0169] [Powder X-ray diffraction measurement]
[0170] The powder of the coloring composition obtained as described above was ...
Example Embodiment
[0175] [Example 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 (model: Egret) was added, and stirred for 1 hour. The reaction solution was filtered twice with filter paper (model: GF-75 manufactured by ADVANTEC) at 50°C. Transfer the filtrate to a square bottom plate (30cm×40cm), put it into a vacuum desiccator, and dry under reduced pressure under the conditions of temperature-heating time of 50℃-2 hours, 65℃-2 hours, and 80℃-20 hours , A purple crystalline colored composition (40.3 g) was obtained. NMR analysis of the coloring composition was performed, and it was confirmed that no organic solvent components such as methanol were observed. For this coloring composition, the powder X-ray diffraction and contrast ratio were measured in the same manner as in Example 1. The results are shown in figure 1 And Table 1.
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