Thermal recording material

Claim 1

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 2 --, --CONH-- or --SO 2 NH--; R 1 , R 2 , and R 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 2 , --SO 2 NH 2 , --CONHNH 2 , --SO 2 NHNH 2 or a group represented by formula (II): ##STR6## wherein y represents a divalent group; R 4 and R 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 2 represents a direct bond, --CO--, --SO 2 --, --CONH-- or --SO 2 NH--; and the R 1 , R 2 , R 3 , R 4 and R 5 substituents may optionally be substituted, and R 1 and R 2 , and R 4 and R 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.