The developed diphenyl sulfone derivative has a higher melting point than the derivative with {TAIL ~ two hydroxyl groups} at both ends and, as a result, the heat resistance of the thermosensitive recording medium using {HEAD ~ the diphenyl} sulfone derivative was also high 
The developed diphenyl sulfone derivative has a higher melting point than the derivative with { TAIL ~ two hydroxyl groups } at both ends and , as a result , the heat resistance of the thermosensitive recording medium using { HEAD ~ the diphenyl } sulfone derivative was also high
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