| 摘要 |
<p>PURPOSE:To provide the titled ink composed of a colored powder obtained by adsorbing a pigment to the surface of powdery resin, water-soluble organic solvent and water, having definite viscosity, high dispersion stability causing little precipitation and segregation and excellent delivery performance from writing utensil. CONSTITUTION:The objective ink contains, as essential components, (A) colored powder obtained by mixing and grinding (i) a pigment and (ii) a powdery resin (preferably a resin having an average particle diameter of 3-100mu, e.g. crushed polystyrene), (B) a water-soluble organic solvent (e.g. ethylene glycol) and (C) water. The amounts of the components A, B and C are preferably 1-60(wt)%, 1-50% and 30-80% based on the whole ink composition, respectively.</p> |
