Heat-sensitive recording material

摘要

Disclosed is a heat-sensitive recording material comprising a base sheet and a heat-sensitive record layer formed over the base sheet and comprising a colorless or pale-colored basic dye and a color developing material capable of forming a color when contacted with the dye, the heat-sensitive recording material being characterized in that the heat-sensitive record layer contains as the color developing material at least one multi-valent metal salt of a halophthalic acid derivative represented by the formula <IMAGE> (I) wherein R represents a divalent saturated or unsaturated C2-C12 aliphatic hydrocarbon group which may optionally have a hydroxyl, C1-C3 acyloxy or phenyl group as a substituent or a divalent saturated or unsaturated C4-C6 aliphatic hydrocarbon group containing one or two ether bonds, X is a halogen atom and n is an integer of 1-4.