| 摘要 |
<p>PURPOSE: To obtain an aqueous ink composition having extremely improved pigment dispersion stability and excellent water resistance of ink image by blending a solution of a water-dispersible synthetic resin in a hydrophilic organic solvent, comprising dispersed pigment, with a liquid consisting essentially of water and removing the solvent. CONSTITUTION: This composition is obtained by blending (A) a solution of a water-dispersible synthetic resin in a hydrophilic organic solvent, comprising dispersed pigment, with (B) a liquid consisting essentially of water preferably by a method for dripping the liquid B to the solution A which is being stirred and removing the solvent. When a black aqueous ink composition is used as the pigment, carbon black is preferably used. A resin obtained by neutralizing a carboxylic acid group-containing styrene-(meth)acrylicester-based copolymer with a base is preferable as the synthetic resin. The solution A is prepared by dispersing or dissolving the resin and the neutralizing agent in the hydrophilic organic solvent, adding the pigment and dispersing by a ball mill, etc.</p> |
