| 摘要 |
<p>PURPOSE:To obtain an oil-base black ink excellent in long-term stability and good in emergence, by mixing Nigrosine with an aliphatic alcohol, dodecylbenzene-sulfonic acid and a specified organic compound. CONSTITUTION:The title oil-base ink contains Nigrosine (A), an aliphatic alcohol (B) (e.g., ethanol), dodecyl-benzensulfonic acid (C) and a substance (D) of the formula (wherein n is 1 or 2). Component A can be dissolved stably because it has excellent solubility in component C and is excellent in compatibility with component B, and the emergence of ink can be improved because the wettability of a writing surface can be improved by the presence of component D. Thus an oil-base black ink excellent in long-term stability and good in emergence can be obtained.</p> |
