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Carbon black for black matrix and manufacturing method thereof

A technology of black matrix and manufacturing method, which is applied in the direction of dyeing low molecular organic compound treatment, fibrous filler, optical filter, etc., can solve problems such as poor image, achieve high contrast, realize contrast, and high insulation effect

Active Publication Date: 2017-04-05
DAIDOU KASEI KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above method, since the material is cheap and the manufacturing process is simple, the black matrix can be manufactured at a very low cost. However, since carbon black has conductivity, when the concentration of carbon black in the resin is increased in order to improve light-shielding properties, the following problems occur: Problem: The formed black matrix itself is also conductive, and conduction occurs between the transparent electrode on the color filter and the black matrix, and between the opposite electrodes, which may easily cause image defects

Method used

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  • Carbon black for black matrix and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of dye-coated carbon black (oxidized)

[0053] 1000 g of carbon black (TPX-1099: manufactured by Cabot Co., Ltd.) was mixed with water to prepare 10 L of slurry, stirred at 95° C. for 1 hour, cooled naturally, and washed with water. This was mixed with water again to prepare 10 L of slurry, 42.9 g of 70% nitric acid was added, and it stirred at 40 degreeC for 4 hours. After cooling and washing with water, this was mixed with water again to prepare 10 L of slurry, 769.2 g of 13% sodium hypochlorite aqueous solution was added, and it stirred at 40 degreeC for 6 hours. After it was naturally cooled and washed with water, it was mixed with water again to prepare 10 L of slurry, 38.1 g of a dye (Direct Deep BLACK) with a purity of 38.4% was added, stirred at 40° C. for 1 hour, and then 10.1 g of aluminum sulfate was further added to Stir at 40°C for 1 hour. After naturally cooling this, it washed with water, filtered and dried, and obtained the carbon black fo...

Embodiment 2

[0060] Preparation of dye-coated carbon black (unoxidized)

[0061] The carbon black for black matrices of this invention was obtained by performing substantially the same process as Example 1 except not carrying out oxidation process with nitric acid and sodium hypochlorite aqueous solution. The carboxyl group content of the obtained dye-coated carbon black was 3.4 mmol / g.

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Abstract

Provided is a carbon black for black matrixes, which has high insulation properties and excellent concealability. A carbon black for black matrixes, the surface of which is coated with an anionic or nonionic dark color dye. The carbon black has at least one kind of acidic functional group on the surface, and the dye is laked by a metal and affixed to the surface of the carbon black or to the acidic functional group.

Description

technical field [0001] The present invention relates to carbon black for black matrices. In detail, it is related with the carbon black for black matrices which have high insulation and excellent concealment. Background technique [0002] In a color filter used in a liquid crystal display device or the like, a black matrix is ​​formed between pixels colored in different hues to block light, improve contrast, and prevent a decrease in color purity. [0003] As a method of forming the black matrix, a method of forming a metal thin film such as Cr on a glass substrate by sputtering or the like, coating a photoresist on the metal thin film, and irradiating the black matrix through a photomask has been conventionally performed. After ultraviolet rays, developing treatment is performed to obtain a resist pattern, and unnecessary parts are removed by etching or the like, but there is a problem that equipment for metal removal is required, and the manufacturing cost is also high. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/48C09C3/08G02B5/20
Inventor 井户川浩幸
Owner DAIDOU KASEI KOGYO KK