| 摘要 |
PURPOSE:To improve the chromatic sectioning properties of a thermal recording material which develops a varying color by providing an intermediate layer having the decomposition wavelength of a diazonium salt compound which becomes longer in proportion to a distance between a layer in which said compound is contained located near a support and the support and allowing a lower decomposition wavelength light to transmit through an area between thermal coloring layers and an upper decomposition wavelength light to be absorbed. CONSTITUTION:The decomposition wavelength of diazonium salts contained in each thermal coloring layer becomes longer in proportion to a distance between a layer near a support and the support. The thermal recording material of each thermal coloring layer incorporates and intermediate layer which allows the decomposition wavelength of diazonium salt compounds contained in a lower layer to transmit and that of the diazonium salts contained in an upper layer to be absorbed. Subsequently, a light emitted for the decomposition of unreacted diazonium salts which are contained in an aimed thermal recording layer is absorbed by the intermediate layer located right below after thermally recording of the aimed thermal recording layer. On the other hand, the light almost does not act on the diazonium salts in the lower layer under the aimed layer. Subsequently, the diazonium salts contained in layers other than the aimed layer do no longer decompose, if thermal recording and optical decomposion processes are repeated. |
