| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ink composition for inkjet used for inkjet recording where a record is made in a decolored state on a recording medium not to permit reading and a printed image is reversibly colored or decolored only when required by a heating means, which ink composition has a high coloring speed and a high decoloring speed, gives a high color developing density, exhibits good preservation stability not to cause clogging and is stable in delivery. <P>SOLUTION: The ink composition comprises, as constituents of the ink, a dye or a color-developing agent comprising a reversibly heat-sensitive material, a dispersant comprising a glycerin fatty acid ester compound, a wetting agent comprising ethylene glycol, and a solvent comprising water. The obtained ink composition for inkjet is printed in a decolored state on a recording paper coated with the color-developing agent or the dye comprising the reversibly heat-sensitive material and is repeatedly subjected to color development and decoloration by heat to cause visualization and unvisualization. <P>COPYRIGHT: (C)2004,JPO |
