| 摘要 |
The present invention provides a multicolor thermal recording material that allows multicolor printing in at least four colors, depending on differences in the conditions of applying heat from a thermal head, and that is inexpensive and has excellent material selectivity, as well as providing a method for developing color of the multicolor thermal recording material. The multicolor thermal recording material comprises (1) a support, and in order from a side close to the support, (2) a first thermal color-developing layer containing a first dye precursor and a color-developing compound reactive with the first dye precursor under heating to develop the color of the first dye precursor, (3) an intermediate layer, (4) a second thermal color-developing layer containing a particle component containing a second dye precursor, and a color-developing compound reactive with the second dye precursor under heating to develop the color of the second dye precursor, and (5) a third thermal color-developing layer containing a particle component containing a third dye precursor, and a color-developing compound reactive with the third dye precursor under heating to develop the color of the third dye precursor; wherein the first, second, and third dye precursors are capable of developing mutually different colors; the second dye precursor-containing particle component contained in the second thermal color-developing layer comprises composite fine particles containing the second dye precursor and a polymeric compound; and the third dye precursor-containing particle component contained in the third thermal color-developing layer comprises composite fine particles containing the third dye precursor and a polymeric compound. |
