Thermal recording material

A thermal recording material comprising, on a support, a heat-sensitive coloring layer containing an electron-donating colorless dye, an isocyanate compound and an amino compound, wherein the amino compound is one represented by formula (I):

• ##STR5## wherein X represents a direct bond, --CO--, --SO.sub.2 --, --CONH-- or --SO.sub.2 NH--;
• R.sub.1, R.sub.2, and R.sub.3 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a sulfonyloxy group, an oxycarbonyl group, a carbamoyl group, a sulfamoyl group, an oxysulfonyl group, an acyl group, a sulfonyl group, a halogen atom, a nitro group, a cyano group, a hydroxyl group, --CONH.sub.2, --SO.sub.2 NH.sub.2, --CONHNH.sub.2, --SO.sub.2 NHNH.sub.2 or a group represented by formula (II):
• ##STR6## wherein y represents a divalent group;
• R.sub.4 and R.sub.5 each represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an acyl group, a sulfonyl group, a halogen atom, a nitro group or a cyano group;
• X.sub.2 represents a direct bond, --CO--, --SO.sub.2 --, --CONH-- or --SO.sub.2 NH--;
• and the R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 substituents may optionally be substituted, and R.sub.1 and R.sub.2, and R.sub.4 and R.sub.5 each may be bonded to each other to form a ring;
• wherein the electron-donating colorless dye is a black-coloring fluoran compound substituted by an arylamino group at the 2-position, a hydrogen atom, a halogen atom or an alkyl group at the 3-position and an amino group at the 6-position, said amino group being further substituted by an alkyl group, a cycloalkyl group, an alkoxyalkyl group or a tetrahydrofurfuryl group.