| 摘要 |
PROBLEM TO BE SOLVED: To form a thermosensible recording material having the improved oil resistance and plastic resistance of a coloring image by the use of a specific fluorane compound as a coloring agent, and a specific organic phosphorous compound as a developer. SOLUTION: As an achromatic or monochromic electron donative coloring agent, there is employed a fluorane compound expressed by formula I. Herein, R<1> and R<2> respectively represent independently alkyl groups of 1-5C. As an electron acceptive developer capable of coloring in contact with the coloring agent, an organic phosphorous compound is used, which is shown by formula II. R<3> , R<4> independently represent a hydrogen atom, a hydroxy group, an alkyl group, an aryl group, or an aralkyl group. However, R<3> , R<4> never exist simultaneously as a hydrogen atom or hydroxy group. |
