| 摘要 |
PROBLEM TO BE SOLVED: To obtain the enhanced stability of a recording image and improve preservation characteristics by employing a specific phenol compound as a developer for color-developing leuco dye on the support during the heating period. SOLUTION: Prepared for liquid A is 3-N, 20 pts. N-dibutyl amino-6-methyl-7- anilinofluoran, 20 pts. 10% water solution of polyvinyl alcohol, 60 pts. water, prepared for liquid B is a 20 pts. developer, a 20 pts. 10% water solution of polyvinyl alcohol, and 60 pts. water expressed by a formula (however, A in the formula shows a heterocycle including at least one or more nitrogen atoms, X shows a bivalent group including a hetero atom, and R shows can aliphatic hydrocarbon radical that can include a substituent), and prepared for liquid C is 20 pts. silicon dioxide, and 80 pts. water. Next, 10 pts. liquid A, 30 pts. B liquid, 10 pts. liquid C, and 10 pts. stearic acid zinc dispersion liquid are blended to be heat sensitive coloring layer forming liquid. Then, a heat sensitive coloring layer is provided by applying and drying the heat sensitive coloring layer forming liquid on the surface of a quality paper for manufacturing heat sensitive recording material. |
