Patent ID: 6835692
Filing Date: 2004-12-28
Classification: B41M

Abstract:
A heat-sensitive recording material having a support and heat-sensitive recording layer, which contains a diazonium salt compound and a coupler compound that reacts with the diazonium salt to develop a color, wherein the recording material contains an oxonol dye represented by the following formula (1): wherein in formula (1), R1 and R2 are a substituted aryl group having a substituent with a dissociable proton or a salt thereof, and R3 and R4 represent independently an alkyl group, an aryl group, a substituted aryl group or a COOR group (wherein R represents a hydrogen atom, an alkyl group or an aryl group); and n represents 0, 1 or 2, wherein the amount of the oxonol dye is 1Ã—10âˆ’6 to 1Ã—10âˆ’3 g/m2.