| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high-sensitivity reversible thermal recording medium which has sufficient color development density and erasability. <P>SOLUTION: In this reversible thermal recording medium, a reversible thermal recording layer containing a reversible thermal composition is provided on a substrate, and at least one protective layer is provided on the reversible thermal recording layer. The reversible thermal composition contains an electron-donating coloring compound and an electron-accepting compound as main components, and can form a relatively color-developed state and a relatively color-erased state, depending on a difference in heating temperature and/or cooling speed after heating. The reversible thermal recording medium is characterized in that a phosphinic compound, which is expressed by general formula (1) (wherein R<SP>1</SP>, R<SP>2</SP>and R<SP>3</SP>each independently represent any one substituent selected from among hydrogen, an aliphatic hydrocarbon group capable of also possessing a substituent, and an aromatic hydrocarbon group), is contained in the reversible thermal recording layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
