Leuco dyes are provided which comprise the coupling product of a N-acyl substituted aromatic amino color developer and a dye-forming coupler moiety substituted at the coupling carbon with a thermally removable leaving group. Thermal imaging systems employing these leuco dyes have the advantage of reduced bubble formation relative to thermal imaging systems employing prior art leuco dyes containing a group which thermally fragments into one or more gases.
所提供的白基
染料包括 N-酰基取代的芳香族
氨基
显色剂与在偶联碳处被热可去除离去基团取代的
染料形成
偶联剂分子的偶联产物。与使用含有可热裂解为一种或多种气体的基团的现有技术白基
染料的热成像系统相比,使用这些白基
染料的热成像系统具有减少气泡形成的优点。