HYDROXYDIPHENYL SULFONE DERIVATIVE AND HEAT-SENSITIVE RECORDING MATERIAL USING THE DERIVATIVE

摘要

A hydroxydiphenyl sulfone derivative represented by the formula (I) is a novel compound and a heat-sensitive recording material which comprises at least one of the derivatives as a color acceptor not only has an excellent recording sensitivity, resistances to plasticizer and diazo developer but also suits to high-speed recording, has an excellent storage stability of record images and does not decrease in whiteness of the background, [I] wherein R1 and R2 are each hydrogen, halogen, lower alkyl, lower alkoxyl or hydroxyl and n is an integer of 3 or 4.