To provide a reversible thermal recording medium having high speed erasing properties capable of corresponding to a thermal head erasing and having a high utility.
The reversible thermal color developing composition capable of forming relatively a color developing condition and a color erasing condition based on the differences of heating temperatures and/or cooling speeds after heating by using an electron-donating coloring compound and an electron-accepting compound, is characterized by comprising at least one kind of Zwitter ion-containing compounds in which the total electric charge in the molecule is 0 as a color developing/color erasing controlling agent, and a hetero-group-containing aliphatic hydrocarbon compound having at least one hetero-group consisting of a 6-24C aliphatic hydrocarbon group and carbonyl group, amino group, ether group, thioether group, sulfoxide group, sulfonyl group alone or a combination thereof.
| JP5489639 | Thermal recording material |
| JPH04169278 | HEAT SENSITIVE RECORDING MATERIAL |
| JP4771975 | Reversible heat sensitive recording material |
YAMAMOTO SATOSHI
OKADA NORITOMO
Yasuo Yoshimura