| 摘要 |
<p>PURPOSE:To provide an oil-based ink having excellent resistance to drying on a pen point, consisting of a salt forming dye obtained from an acid or direct dye and a cationic surfactant, water, an organic solvent compatible with water and a resin. CONSTITUTION:The oil-based ink consists of (a) a salt forming dye obtained from an acid dye and/or direct dye and a cationic surfactant, or a basic dye and an anionic surfactant, (b) water which is used in 5-25% of the total weight of the ink, (c) an organic solvent having compatibility with water and (d) a resin. The acid and direct dyes may be used singly or in admixture preferably in an amount of 0.1-20% of the total weight of the ink. The cationic surfactant may be used singly or in admixture in an amount which may be varied according to the amount of the dye added, preferably in 0.5-20% of the total weight of the ink to obtain optimum ink viscosity and higher solubility.</p> |
