| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an irreversible thermal discolorable ink composition which can be easily discolored with simple heating such as rubbing, does not redevelop the color even in an environment of extremely low temperature (-20°C or lower) after the ink is once deleted, and is not discolored even when left to stand under an environment of a high temperature (about 75°C), without using any microcapsule. <P>SOLUTION: The irreversible thermal discolorable ink composition comprises as a coloring agent color-developing particles composed of at least a leuco dye, a color-developing agent and a crystalline substance, and further comprises a xylene resin. <P>COPYRIGHT: (C)2013,JPO&INPIT |
