Thermosensitive recording material

A thermosensitive recording material comprising:

• a sheet substrate;
• and
• a thermosensitive colored image-forming layer formed on the sheet substrate and comprising a substantially colorless dye precursor, 10 to 40% based on the total dry weight of the thermosensitive colored image-forming layer of a color-developing agent reactive with the dye precursor upon heating to thereby develop a color, and a binder,
• the color-developing agent comprising at least one compound selected from the group consisting of the methacryloylimido compounds of the formulae (I) to (V). ##STR14## in which formulae (I) to (V), R.sub.1 represents a member selected from the group consisting of a hydrogen atom and alkyl, aryl, aralkyl, alkenyl and cycloalkyl groups;
• R.sub.2 and R.sub.3 respectively and independently from each other represent a member selected from the group consisting of a hydrogen, and alkyl, aryl, aralkyl, alkenyl and acetyl, except that when one of R.sub.2 and R.sub.3 represents a hydrogen, the other R.sub.2 and R.sub.3 represents a member other than the hydrogen, which R.sub.2 and R.sub.3 may be formed together with a carbon atom bonded thereto into a cyclic structure;
• R.sub.4 represents a member selected from the group consisting of alkyl, aryl, aralkyl, alkenyl, piperidino, succinimido, .rho.-benzoylphenyl, ##STR15## and R.sub.5 and R.sub.6 respectively and independently from each other represent a member selected from the group consisting of a hydrogen, alkyl, aryl, aralkyl, alkenyl, cycloalkyl, thiazolinyl and morpholino, which R.sub.5 and R.sub.6 may be formed together with a nitrogen atom bonded thereto into a cyclic structure selected from the group consisting of ##STR16## in which formulae (VI) to (VIII), R.sub.7, R.sub.9 and R.sub.11 respectively and independently from each other represent a member selected from the group consisting of unsubstituted aromatic cyclic groups and substituted aromatic cyclic groups having at least one substituent selected from the group consisting of alkyl, alkoxyl, acyl, aryl, nitro and carboxylic groups and halogen atoms;
• R.sub.8, R.sub.10 and R.sub.12 respectively and independently from each other represent a member selected from the group consisting of unsubstituted or substituted alkyl, aryl, aralkyl and alkenyl groups and each of said substituted group having at least one substituent selected from the group consisting of alkyl, alkoxyl, acyl, nitro and halogen;
• and
• R.sub.13 represents a member selected from the group consisting of hydrogen, unsubstituted or substituted alkyl, aryl, aralkyl and alkenyl groups, each of said substituted groups having at least one substituent selected from the group consisting of alkyl, alkoxyl, acyl, nitro and halogen.