Then the inventors discovered as a result of a study that a thermosensitive recording medium with well balanced performance among {TAIL ~ 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 derivative in which one end contains a hydroxyl group and the other end contains an alkoxy group and a phenol derivative with {HEAD ~ a specific structure} 
Then the inventors discovered as a result of a study that a thermosensitive recording medium with well balanced performance among { TAIL ~ 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 derivative in which one end contains a hydroxyl group and the other end contains an alkoxy group and a phenol derivative with { HEAD ~ a specific structure }
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 TAIL TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD