State and the out color color development relatively making use of

摘要

PROBLEM TO BE SOLVED: To provide a reversible heat-sensitive color-developing composition which retains stable color developing properties and stable decolorizing properties and sensitively responds to heat and deals with rapid decolorizing requirements and a reversible heat-sensitive recording medium.;SOLUTION: In the reversible heat-sensitive color developing composition which uses an electron-donative coloring compound and an electron-receptive compound and relatively forms a color developing state and a decolorizing state due to a difference in the heating temperature and/or the cooling rate after heating, the electron-receptive compound to be used is a coumarin derivative represented by formula (1) (wherein, 'm' is an integer of 5 to 21).;COPYRIGHT: (C)2003,JPO