The diphenyl sulfone derivatives previously utilized as a color developing agent or {TAIL ~ an image stabilizer} in a thermosensitive color developing layer of {HEAD ~ a thermosensitive recording medium} were mainly the derivatives containing hydroxyl groups in both ends 
The diphenyl sulfone derivatives previously utilized as a color developing agent or { TAIL ~ an image stabilizer } in a thermosensitive color developing layer of { HEAD ~ a thermosensitive recording medium } were mainly the derivatives containing hydroxyl groups in both ends
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH