| 摘要 |
PURPOSE:To obtain a thermal recording material with a high sensitivity excellent in the thermal response by arranging a specified 1,4-dihydroxynaphthalene derivative to be contained as an intensifier into thermal recording material containing a dye precursor and the intensifier. CONSTITUTION:1,4-Dihydroxynaphthalene derivative of the formula (wherein R represents methyl group or ethyl group) is added to a composition for a thermal recording material mainly composed of a colorless or light dye precursor such as triphenylmethane based, fluorane based and diphenylmethane based ones and a developer as acid substance such as phenol at the rate of 5wt% or more, preferably 10-400wt% with respect to the developer. Furthermore, a widely-accepted binder, pigment and other assistants are added to the composition properly and it is provided in a layer on a support of paper, a resin film or the like. |
