| 摘要 |
PURPOSE:To prevent the deterioration of a white paper part and a developed color part due to chemicals and to enhance ink receptivity, in a thermal recording sheet based on a dye precursor and a coupler for allowing said dye precursor to develop a color at the time of heating, by providing an overcoat layer excellent in film characteristics. CONSTITUTION:In a thermal recording sheet having such a system that a dye precursor such as Crystal Violet lactone and an acidic coupler such as a phenol compound are discontinuously dispersed and applied and one of them or both of them is melted under heating to form a color, N-acylamino acid ester, N- acylamino acid amide or N-acylamino acid amine is contained in the overcoat layer based on a water-soluble high-molecular compound provided on the thermal color forming layer. The addition amount of said additive to the overcoat layer is 0.5wt% or more, desirably, 1-60wt% from the aspect of ink receptivity enhancing effect, color forming sensitivity and printability. |
