Then the inventors discovered as a result of a study that a thermosensitive recording medium with well balanced performance among color developing sensitivity in the image section, moist heat resistance, plasticizer resistance and the like could be obtained through the combined use of a diphenyl sulfone {TAIL ~ derivative} in which {HEAD ~ one end} contains a hydroxyl group and the other end contains an alkoxy group and a phenol derivative with a specific structure 
in
Then the inventors discovered as a result of a study that a thermosensitive recording medium with well balanced performance among color developing sensitivity in the image section , moist heat resistance , plasticizer resistance and the like could be obtained through the combined use of a diphenyl sulfone { TAIL ~ derivative } in which { HEAD ~ one end } contains a hydroxyl group and the other end contains an alkoxy group and a phenol derivative with a specific structure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH