| 摘要 |
PURPOSE:To reduce the background fog caused by the heat build-up of a thermal head and the refuse bonded to the thermal head by containing a usually colorless - light-colored dye precursor and a coupler and further containing two specific compounds. CONSTITUTION:A usually colorless - light-colored dye precursor and a coupler reacting with the dye precursor at the time of heating to allow the dye precursor to form a color are contained and compounds represented by formulae I, II are further contained. The amount to be added of the compound represented by the formula I and that of the compound represented by the formula II are respectively 25 - 70% and 50 - 100% by wt. of the coupler and the total amount of the compounds represented by the formulae I, II is 75 - 175% by wt. of the coupler. By this method, a thermal recording layer wherein the refuse bonded to a thermal head is reduced and the background fog caused by the heat build-up of the thermal head is reduced is obtained. |
