| 摘要 |
PROBLEM TO BE SOLVED: To increase coloring density, decrease decoloring density and stabilize recording as well as elimination by a method wherein phenol compound, shown by a specified formula, is employed as an electron receptor compound for a reversible heat sensitive coloring composite utilizing coloring reaction by the electron receptor compound of electron donor coloring compound. SOLUTION: In a reversible heat sensitive coloring composite, employing electron donor coloring compound and electron receptor compound while capable of forming coloring condition and declaring condition relatively by the difference of a heating temperature and/or cooling speed after heating, phenol compound, shown by a formula, is employed as the electron receptor compound. Here, in the formula, (γ) shows the integer of 1-3, while X and Y show a dihydric group including heteroatom. R1 shows aliphatic hydrocarbon group having more than two carbon number, which can have a substituent group, and, further, the aliphatic hydrocarbon can include aromatic ring. R2 shows a hydrocarbon group, constituted of aliphatic hydrocarbon group, aromatic hydrocarbon group or both of the groups. |
