THERMOSENSITIVE RECORDING MATERIAL

PROBLEM TO BE SOLVED: To improve transparency and recording properties by forming a thermosensitive recording layer out of a film of a coloring agent and basic dye by an evaporation method and by making a protective layer contain acetoacetylated polyvinyl alcohol and colloidal silica. SOLUTION: An evaporation film may be formed of separate films of basic dye and a coloring agent or of a mixture film thereof. As for the basic dye, the dye coloring in blue, green, red or black, the dye having an absorption wavelength in a near-infrared region, etc., can be mentioned. As for the coloring agent, a compound having an arylsulfonylaminocarbonylamino group, or others, can be mentioned. A protective layer is formed by using acetoacetylated polyvinyl alcohol and colloidal silica. As to the acetoacetylated polyvinyl alcohol, it is preferable that the degree of acetoacetylation is 0.5-10mol% and the degree of polymerization 500-3000. The colloidal silica is a colloidal solution prepared by dispersing ultrafine particles of silicic acid anhydride in water and it is preferable that the particle size is 1-100nm, the specific gravity 1.01-1.50 and the pH value 1.5-7.