| 摘要 |
PROBLEM TO BE SOLVED: To improve the image preservation property of a recording part, especially, the plasticizer resistance, the oil resistance, and the water resistance by containing a polyurea compound in the heat-sensitive color developing layer. SOLUTION: A heat-sensitive color developing layer contains a colorless or slightly colored dye precursor, and a developer which makes the dye precursor develop a color by reacting with the dye precursor at the time of heating. IN the heat-sensitive color developing layer, a polyurea compound having a structure represented by a formula 1 (In the formula, A1 represents a bivalent group.) as a stabilizer component. In the heat-sensitive color developing layer, a polyurea compound having a repeating unit represented by a formula 2 (In the formula, R<1> , R<2> respectively represent an alkyl group, an alkoxy group, an electron attractive group. (o), (p) respectively represent integers of 0-4. A<2> represents a bivalent group.) may be contained. By this method, excellent functions can be displayed in the image preservation property such as plasticizer resistance, oil resistance, and water resistance. |
