| 摘要 |
PROBLEM TO BE SOLVED: To improve long term stability of a color-developed image by improving oil resistance and plasticizer resistance of the color-developed image of a thermal recording body. SOLUTION: A color developer incorporated with a dye precursor in a thermal color developing layer of a thermal recording body is incorporated with at least one kind of org. compd. of formula (wherein R1 and R2 are each one member selected from benzene ring and naphthalene ring substd. by at least one member selected from no substitution, lower alkyls and halogen atoms and R3 is a member selected from hydrogen atom and halogen atoms. |
