In a thermal recording sheet having a thermal recording layer containing a colorless or pale colored dye precursor and a color developer reactable with the dye precursor upon heating to develop a color, a dimerized or trimerized urea compound is used as the color developer to obtain a thermal recording sheet which is superior in ground color stability and a thermal recording sheet having a reversible recordability.
在一种热敏记录片材中,其热敏记录层含有无色或浅色
染料前体和可在加热时与
染料前体发生反应以显色的
显色剂,使用二聚或三聚
脲化合物作为
显色剂,可获得地色稳定性更好的热敏记录片材和具有可逆记录性的热敏记录片材。