Thermally reversible color forming composition and thermally reversible recording medium using the thermally reversible color forming composition

摘要

A thermally reversible color forming composition which includes an electron-donating chromophoric compound and an electron- accepting compound, by which formation and deletion of a color image may be carried out by adjusting thermal energy applied to the composition, wherein the electron-accepting compound is a carboxylic acid compound having the following general formula (1):PPR.sub.1 --X--R. sub.2 -- COOH (1)PPin which, X represents a divalent group having at least one hetero atom, R.sub.1 represents a hydrocarbon group having at least one hetero atom, R.sub.2 represents an aliphatic hydrocarbon group, which may be substituted and whose principle chain contains less than 6 carbon atoms.