| 摘要 |
PROBLEM TO BE SOLVED: To obtain carbon black suitable for forming a black matrix having high light screening property and blackness degree and extremely low electroconductivity and to provide a method for producing the same. SOLUTION: This carbon black for a black matrix is characterized in that carbon black having >=50 m<2> /g nitrogen absorption specific surface area (N2 SA) and <=140 cm<3> /100 g DBP absorption is oxidized, a functional group on the surface of the oxidized carbon black having the value of atomic ratio (intensity of oxygen bond energy/intensity of carbon bond energy) of total oxygen atoms based on total carbon atoms of >=0.1 measured by X-ray photoelectron spectroscopy is converted to an azo group to give a base and a vinyl polymer formed by subjecting a vinyl group-containing monomer to radical graft polymerization is chemically bonded to the base. This method for producing the carbon black for a black matrix is provided. |
