| abstract |
PROBLEM TO BE SOLVED: To improve dispersion stability of carbon black in an aqueous medium, improve storage stability of a recording ink using carbon black as a coloring material, and to use a recording ink in an ink recording apparatus. In this case, the ink is prevented from being clogged in the nozzles, the ink is stably ejected, and a good image with little disturbance of the image or uneven density is stably obtained. . SOLUTION: In a recording ink in which a coloring material made of carbon black is dispersed in an aqueous medium, a functional group generated by the decomposition of a radical generator made of a peroxide polymer is chemically bonded to the surface as the coloring material. Carbon black was used. |