| 摘要 |
<p>PURPOSE:To provide the subject ink containing at least specific carbon black, dispersing agent and a specific pH buffering solution, having excellent drying characteristics and fixing property to plain paper, free from trouble of nozzle clogging in recording and having excellent storage stability and high safety. CONSTITUTION:The objective ink contains at least (A) preferably 1-30wt.% (especially 3-12wt.%) of carbon black having pH of <=6, (B) preferably 0.3-30wt.% (especially 1-15wt.%) of a dispersing agent composed of conventional anionic surfactant and a polymer dispersing agent and (C) preferably 1-35wt.% of a buffering solution having pH of 6-8 and composed of potassium dihydrogen phosphate-sodium hydroxide, sodium tetraborate-hydrochloric acid, etc.</p> |
