| 摘要 |
PROBLEM TO BE SOLVED: To obtain a water-based ink high in infiltrativity and redissolvability by adding a lower alcohol's propylene oxide addition polymer to an ink prepared by dispersing in an aqueous medium a colored resin particles with a colorant contained in a film-forming resin. SOLUTION: First, an ink is prepared by the following process: a film-forming resin (e.g. styrene-acrylic acrid resin) and a colorant (e.g. carbon black) are blended with methyl ethyl ketone and glass beads followed by kneading by use of a paint shaker, and methyl ethyl ketone and isopropyl alcohol are then added to the resultant blend into a mill-base solution, which, in turn, is incorporated with triethanolamine followed by dripping a mixed solution composed of glycerol and ion-exchanged water into the mixture under agitation followed by distilling off the organic solvent. The ink thus prepared is such one that colored resin particles with the colorant included in the film-forming resin is dispersed in an aqueous medium. Subsequently, the ink is blended with a lower alcohol's propylene oxide addition polymer to obtain the objective water- based ink low in blurring and foaming and good in infiltrativity and redissolvability. |
