| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a reaction method for oxidizing carbon black, having less precipitate, capable of obtaining dispersion in a high yield, which is also good in the point of a long period preservation stability, self-dispersing type carbon black oxidized by the reaction method and aqueous pigment-based jet ink excellent especially in both of dispersion stability and ejection stability of the ink by obtaining the ink composition consisting mainly of the self-dispersion type carbon black dispersion. <P>SOLUTION: This method for producing surface-treated carbon black is characterized by crushing (a) carbon black in water by using (c) a dispersing agent in advance, and then liquid phase-oxidizing by using (b) a hypochlorite solution. The method for producing self-dispersing type carbon black dispersion is provided by removing≥50% reaction supernatant from the slurry containing the oxidative surface-treated carbon black by a centrifugal separation method and/or decantation method, diluting the rest of slurry containing the carbon black with deionized water and performing deionization by an ultrafiltration method. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
