| 摘要 |
<p>PURPOSE:To obtain an oil-based ink excellent in long-term stability and useful for writing utensils which can give writings which do not blur with time, by using a salt-forming oil-soluble dye, a solvent and a specified surfactant as essential components. CONSTITUTION:3-20wt.% salt-forming oil-soluble dye (a) (e.g., C.I. Solvent Violet 27) which can be obtained by substituting a hydrophobic group for the hydrophobic group of an acid dye, a direct dye, a basic dye or the like is mixed with 40-90wt.% solvent (b) (e.g., n-propanol), 2-20wt.% surfactant (c) of an HLB>=4.8 (e.g. sorbitan monolaurate) and, optionally, other oil-soluble dyes, 1-20wt.% synthetic resin, a rust-preventive, etc. (d).</p> |
