| 摘要 |
PURPOSE:To achieve improvement of coloring sensitivity by a method where in a sensitizer which is solid at ordinary temperature and of which a dissolving parameter is composed of a specific compound is contained. CONSTITUTION:An electron donative colorless coloring agent and an electron acceptive developing substance, and a sensitizer to be expressed by the formula (I) which is solid at ordinary temperature and is composed of a compound of 9.5-13 in dissolving parameter, are contained in a layer to be formed on a base material. In the formula (I), however. Ar represents a benzene ring or a naphthalene ring, X and Z represent -SR redical, -COT radical (R represents 6 max. C hydrocarbon radical in each radical above-mentioned.) or a halogen atom, and m, n represent an integer of 0-2 (however, m and n are not simultaneously zero.). Each SP of the electron donative colorless coloring agent, the electron acceptive developing substance, and a lubricant is separated considerably apart from each other. Since they are difficult to cope with instant dissolution by heat, the sensitizer bearing intermediation between those dissolution, i.e., a compound having 9.5-13 SP is effective. |
