摘要 |
PROBLEM TO BE SOLVED: To obtain the subject new compound useful as a material for a colorization/decolorization controlling agent for a reversible thermo-sensitive recording medium, which, when used for the above medium, quickly erases the color and is excellent in preservation stability. SOLUTION: This compound is shown by the formula [(q) is 1 to 11; (r) is 11 to 17; and R is a <=4C aliphatic hydrocarbon], e.g. methyl N'-n- octadecylureidoacetate. The compound shown by the formula is obtained by, e.g. esterification of amino acid and adding the product to an alkyl isocyanate, preferably in an organic solvent, e.g. toluene. A reversible thermo-sensitive recording medium is obtained by including (A) the above compound serving as a colorization/decolorization controlling agent, (B) a developer, e.g. dodecylphosphonic acid, and (C) a colorant e.g. 2-anilino-3-methyl-6- dimethylaminofluoran. It is preferable to include the component B at 0.1 to 20 mols per mol of the component C and the component A at 0.1 to 300 wt.% based on the component B. |