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Pigment dispersion, coloring composition for color filter, color filter, liquid crystal display and organic EL display

A technology of pigment dispersion liquid and coloring composition, applied in the direction of optical filter, pigment slurry, instrument, etc., can solve problems such as contrast reduction, viscosity increase, dispersion stability reduction, etc.

Active Publication Date: 2009-09-23
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zinc bromide phthalocyanine pigment, which is a new type of green pigment, has the following problems: when it is miniaturized to improve the contrast, the dispersion stability is extremely reduced, and due to the influence of light scattering caused by secondary aggregates, when used in televisions, Contrast becomes insufficient
However, according to the verification of the inventors of the present invention, even if these polymer dispersants are used, the dispersion stability of the above-mentioned micronized zinc bromide phthalocyanine pigment cannot be sufficiently ensured, and there is also thickening caused by re-agglomeration, and a problem caused by aging. Problems such as reduction of contrast caused by condensation

Method used

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  • Pigment dispersion, coloring composition for color filter, color filter, liquid crystal display and organic EL display
  • Pigment dispersion, coloring composition for color filter, color filter, liquid crystal display and organic EL display
  • Pigment dispersion, coloring composition for color filter, color filter, liquid crystal display and organic EL display

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0553] [3] Preparation of coloring composition

[0554] Next, a method for producing the coloring composition of the present invention will be described.

[0555] As mentioned above, the coloring composition for color filters of this invention can be prepared by mixing other components with the previously prepared pigment dispersion liquid, and can also mix all components simultaneously or sequentially. Hereinafter, the case of preparing according to the former method will be described as an example, but it is not limited thereto.

[0556] In addition, the coloring composition for color filters of the present invention may be photocurable (photopolymerizable) or thermally polymerizable depending on the manufacturing process to be used. Hereinafter, although the case where the coloring composition for color filters is a photopolymerizable composition (it may be called a "resist" hereafter) is demonstrated as an example, this invention is not limited to this.

[0557] First, p...

Embodiment

[0610] Hereinafter, the present invention will be described more specifically with reference to production examples, examples, and comparative examples, but the present invention is not limited to the following examples unless the gist thereof is exceeded.

[0611] It should be noted that Examples 1-4 and Comparative Examples 1-2 are examples of using C.I. Pigment Green 36 as a pigment, and Examples 5-36 and Comparative Examples 3-7 are examples of using zinc bromide phthalocyanine pigment as a pigment. , Examples 37-43 are examples of using red pigments such as C.I. Pigment Red 254 as pigments.

[0612] Among them, Examples 7 to 15 and Comparative Examples 5 to 6 are based on the further use of "a copolymer containing an epoxy group-containing (meth)acrylate and other radically polymerizable monomers, and an epoxy group that the copolymer has." A resin obtained by adding at least a part of an unsaturated monobasic acid, or an alkali-soluble resin obtained by adding at least a...

Synthetic example 1

[0616] [Synthesis Example 1: Synthesis of Brominated Zinc Phthalocyanine]

[0617] Zinc phthalocyanine is produced from phthalonitrile and zinc chloride. The obtained 1-chloronaphthalene solution of zinc phthalocyanine has light absorption at 600-700 nm.

[0618] At 40° C., 3.1 parts by weight of sulfuryl chloride, 3.7 parts by weight of anhydrous aluminum chloride, 0.46 parts by weight of sodium chloride, and 1 part by weight of zinc phthalocyanine were mixed, and 4.4 parts by weight of bromine were added dropwise to perform halogenation. After reacting at 80° C. for 15 hours, the reaction mixture was poured into water to precipitate a zinc bromide phthalocyanine crude pigment. This aqueous slurry was filtered, washed with hot water at 80° C., and dried at 90° C. to obtain 3.0 parts by weight of a crude zinc bromide phthalocyanine pigment.

[0619] Add 12 parts by weight of crushed sodium chloride, 1.8 parts by weight of diethylene glycol and 0.09 parts by weight of xylene ...

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Abstract

Disclosed is a pigment dispersion exhibiting both high contrast and adequate dispersion stability, wherein a granulated pigment is used. Also disclosed is a coloring composition for color filters having good developability, which uses the pigment dispersion. Specifically disclosed is a pigment dispersion containing a pigment, a solvent and a dispersing agent, which is characterized in that the dispersing agent contains a block copolymer composed of a block A having an affinity for solvents and a block B having a functional group containing a nitrogen atom. This pigment dispersion is also characterized in that the dispersing agent has an amine number of not less than 80 mgKOH / g but not more than 150 mgKOH / g in terms of the effective solid content. Also specifically disclosed is a use of such a pigment dispersion.

Description

technical field [0001] The present invention relates to a pigment dispersion, a coloring composition for a color filter, a color filter, a liquid crystal display device, and an organic EL display. More specifically, it relates to the following aspects: a pigment dispersion liquid in which a highly micronized pigment is effectively and stably dispersed; a coloring composition for a color filter having excellent color characteristics and developability suitable for a plate-making process; A color filter for a pixel formed by coloring the composition; and a liquid crystal display device and an organic EL display having the color filter. Background technique [0002] Conventionally, pigment dispersion methods, dyeing methods, electrodeposition methods, and printing methods are known as methods for producing color filters used in liquid crystal display devices and the like. Among them, the pigment dispersion method having excellent characteristics in a balanced manner is most wi...

Claims

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Application Information

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IPC IPC(8): C09D17/00G02B5/20G03F7/004G03F7/033
Inventor 大畑达宽远洞典子冈田英夫川口彩子田野冈久永居岛洋一郎迫直树
Owner MITSUBISHI RAYON CO LTD
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