| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an aqueous ink composition for a writing utensil that can be spread handwritten characters and the like with water immediately after writing upon writing on an ink absorbing surface to be written such as a paper or the like and will exhibit water resistance after a certain period of time passes. <P>SOLUTION: The aqueous ink composition for a writing utensil comprises water, a pigment, an acid dispersant resin and a neutralizing agent for neutralizing the dispersant resin so as to be soluble in water wherein the acid dispersant resin is a resin having a molecular weight of 10,000 or more and an acid number of 180 or more; the neutralizing agent is an organic amine having a boiling point of 150-400°C; and the weight ratio of the acid dispersant resin to the pigment is 0.75 or more. Upon writing on an ink absorbing surface to be written such as a paper or the like by using the aqueous ink composition, the handwritten characters and the like can be spread with water for a while after writing, but after a certain period of time passes, the handwritten characters and the like will exhibit water resistance and cannot be spread with water any longer. For example, a water color painting with water resistance can be made by using the aqueous ink composition. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
