| 摘要 |
There is provided a developer composition including at least one of sulfonyl compounds represented by formula (1) and at least one of sulfonyl compounds represented by formula 2: wherein X is H or lower alkyl, R1, R2, R3, R4, R5 and R6 which may be the same or different, present H, halogen or lower alkyl and Y represents alkyl, benzenesulfonyl, benzoyl et al, A thermalsensitive recording medium having the above developer is of high sensitivity, less surface-blushing with lapse of time and is excellent in storage stability of a recorded image, particularly in heat resistance, humidity resistance and anti-plasticizer.
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