Carboxylate and heat-sensitive recording material using same

摘要

A carboxylate is herein disclosed which is represented by the formula (1) or (2) <IMAGE> (1) <IMAGE> (2) wherein a ring X is an aromatic residue which may have a substituent; the other substitutents are as defined herein. A heat-sensitive recording material comprising this carboxylate is excellent in the stability of the color image and can provide an optically character-readable sharp color image.