For example, it is used by many customers as a black matrix for color filters used in LCD screens. In addition, we have a lineup of conductive carbon dispersions and insulating carbon dispersions.
This paper explains functions and utilization methods obtained by dispersing carbon particles.
What is carbon dispersions?
Type of carbon black
There are various types of carbon blacks, depending on their production methods and characteristics. Carbon black is famous as a reinforcing material that drastically increases its resistance and other properties by doping rubber products such as tires with a small amount of carbon black. It is also most commonly used as a black pigment for paints and inks. Because it is relatively inexpensive compared with other black pigments, it is often used as a black pigment in mass-consumed materials.Since carbon black is originally carbon, it is conductive. While there are conductive carbon blacks such as acetylene black and ketjen black that are excellent in surface purity, surface area, and structure length of carbon blacks, it is also possible to impart features that reduce conductivity as much as possible depending on the method of surface treatment and the degree of dispersion.
What is a carbon dispersion?
Carbon dispersions also vary depending on their use. Various factors are selected and combined according to the use of carbon black, resin, dispersant, dispersion time, filling rate of dispersion medium, peripheral speed of dispersing machine, etc. to produce the optimum dispersion.For example, when photoresists are formed using TOKUSHIKI dispersions in black matrices for LCDs, the development characteristics such as "smoothness of surfaces," "line rectilinearity," and "fine line adhesion" are improved by the optimum fine dispersion, resulting in improved display performance.
Other applications include tablets, smartphone components, and battery-related components.
TOKUSHIKI's carbon dispersions can be made compatible with many resinous solutions according to the requirements, and are excellent in storage stability and workability. It can also be dispersed at high concentrations.
Characteristics of Conductive Carbon Dispersion Liquid
What is a Conductive Carbon Dispersion Liquid?
Conductive carbon refers to carbon black that can impart conductivity with a small amount of carbon added.Typical examples include Ketjen Black and Acetylene Black.
Originally, there are electrons around the structure of carbon black, which move to make it conductive. However, what is called conductive carbon is characterized by a small amount of impurities on the surface of the structure, a large surface area of the structure, and a high structure, which makes it easier for conductive circuits to form in the base material.
TOKUSHIKI's conductive carbon dispersions are made by uniformly and stably dispersing conductive carbon, and have the following characteristics.
Features 1. It is easily compatible with many resin solutions such as urethane, acrylic, fluorine and polyester.
Features 2. Storage stability and workability are excellent.
Lineup of conductive carbon dispersions
| Lineup | Features |
| 8652BLACK | High conductivity (10-3 compared to general carbon) and low viscosity in water |
| 8653BLACK | High conductivity (10-3 compared to general carbon), low viscosity in solvent system |
Characteristics of Insulating Carbon Dispersion Liquid
What is an Insulating Carbon Dispersion Liquid?
There are free electrons around the structure of carbon black at the molecular level, as do metals. Therefore, carbon black is a conductive material if there is a structural connection. Conductive carbon dispersions take advantage of these characteristics, but on the contrary, insulating properties (high resistance) may be required even for carbon dispersions. Insulating carbon (high resistivity carbon) is carbon black that is formed by processing the surface of a carbon black structure to make it difficult for electricity to pass through.In addition, insulating carbon dispersions have the following characteristics by providing carbon black with a uniform and reasonable degree of dispersion such that a structure cannot be produced.
Feature 1. It is easily compatible with many resin solutions such as urethane, acrylic, and polyester
Feature 2. Storage stability and workability are excellent.
Lineup of insulating carbon dispersions
| Lineup | Features |
| 8710BLACK | Water-based dispersions with both high dispersibility and insulating properties |
| 8711BLACK | Solvent-based dispersions compatible with a wide range of compatibility and insulation properties |
Characteristics of Black Matrix for Liquid Crystal Panel Color Filters
What Is Black Matrix?
Color filters are used to display LCD panels in color. For color filters, RGB (red, green, blue) dispersions are formed on the surface of the color filter as fine cells, which require a black matrix (BM) to surround the cells. BM prevents light from leaking from the enclosure and prevents RGB from being mixed. There are various types of BM depending on the application, and various conditions such as shape, angle, and surface smoothness are required depending on the application.TOKUSHIKI's BMs disperse fine particles,
1)Surface smoothness 2)Line rectilinear property 3)Adhesion to fine lines are realized, and development characteristics are excellent.
It also improves display performance by 4)blocking the backlight, 5)preventing color mixing between adjacent RGB, and 6)improving contrast.
Summary
TOKUSHIKI's carbon dispersion achieves functions optimized for use by utilizing the characteristics of carbon black in its degree of dispersion and formulation.In TOKUSHIKI, we offer a range of products, including conductive carbon dispersion, insulating carbon dispersion and black matrix dispersions.
TOKUSHIKI's carbon dispersions can be made compatible with many resinous solutions according to the requirements, and are excellent in storage stability and workability. It can also be dispersed at high concentrations.
