| 摘要 |
PURPOSE:To enhance the fastness of a developed color part of a recording material, by using a condensate obtained by a reaction of a specified fluoran derivative with a specified compound as a thermal color forming component. CONSTITUTION:This recording material comprises as a thermal color forming component a product of a reaction of 2mol of a fluoran compound of general formula I with 1mol of an aldehyde or ketone compound of general formula II. In the formulas, each of R1 and R2, which may be the same or different, is a 1-6C alkyl, and each of R3 and R4, which may be the same or different, is hydrogen, a 1-6C alkyl or phenyl. The condensed product is relatively low in solubility in plasticizers, oils, organic solvents or the like, so that the fastness of a developed color part of this thermal recording material is thereby markedly enhanced. |
