| 摘要 |
PROBLEM TO BE SOLVED: To improve the coloring sensitivity, and improve the preservation property of a printing, and prevent a base blushing from occurring by a method wherein a thermosensitive agent comprises an isocyanate adduct compound of which the melting point is a specified temperature or higher, and a fluoran based dye precursor represented by a specified structural formula. SOLUTION: This termrosensitive agent comprises an isocyanate adduct compound of which the melting point is 40 deg.C or higher, and a fluoran based dye precursor represented by a formula. In the formula, both of Y1 and Y2 indicate an alkyl group or an alkoxy group, and at least one of them has a number of carbon atoms with is three or higher. Y3 indicates hydrogen atom, annually group and an alkoxy group. Y4 and Y5 indicate hydrogen atom, halogen atom, an alkyl group or an alkoxy group. Then, a usage of the fluoran based dye precursor by approx. 5-500 wt.% of the isocyanate adduct body compound is preferable, and more preferably, 20-200 wt.% is used. By this thermosensitive agent, a developer can be added. By this method, the sensitivity of the thermosensitie agent is improved, and in addition, the printing preservation property becomes excellent. |
