| 摘要 |
PURPOSE:To improve color forming sensitivity and storability, by incorporating a specified fluoran compound as a color former, an alkyl gallate or p-substd. phenol as a color developer and a carbonic acid diester as a heat-fusible substance, in combination, into a thermal color forming layer. CONSTITUTION:A fluoran derivative of formula I as a color former, a phenolic compound of formula II or III as a color developer and a carbonic acid diester of formula IV as a sensitizer, are incorporated in a thermal color forming layer. The phenolic compound is preferably used in an amount of 2-3pts.wt. per 1pt.wt. of the fluoran derivative. The carbonic acid diester as a heat-fusible substance (sensitizer) is preferably used in an amount of 3-5pts.wt. per 1pt.wt. of the fluoran derivative. To obtain a thermal recording material by using these constituents of the thermal color forming layer, the constituents are ground and dispersed by the usual method to prepare dispersed liquids, which are mixed with each other to prepare a coating liquid for forming the thermal color forming layer, and the coating liquid is applied to a base such as a paper, followed by drying. |
