abstract |
Disclosed is an improved dispersion stability of an aqueous dispersion containing a carboxyl group-containing polyvinyl alcohol resin. SOLUTION: A coating for a thermosensitive coloring layer containing a leuco dye, a developer, a carboxyl group-containing polyvinyl alcohol resin, and water. In the working solution, a heat-sensitive color developing layer coating solution having a pH of 6.4 to 8 at 20 ° C. is used. [Selection figure] None |