| 摘要 |
PURPOSE:To obtain a thermal recording sheet free of hindrance to color development or lowering in sensitivity on a thermal color forming layer, having favorable printing quality and highly resistant to chemicals, by incorporating a compound having one glycidyl group in its molecule and being solid at normal temperature into an overcoat layer. CONSTITUTION:At least one compound having one glycidyl group in its molecule and being solid at normal temperature is incorporated into an overcoat layer, in a thermal recording sheet in which a thermal color forming layer comprising a colorless or light-colored dye precursor and a color developer for developing the color of the dye precursor by reacting therewith when being heated as main constituents is provided on a base, and the overcoat layer comprising a water-soluble high molecular weight substance as a main body is provided on the color fomring layer. The compound is preferably a difficultly water-soluble one, and an aromatic compound or a sulfur- containing compound is useful as the compount. A base material for forming the overcoat alyer is preferably a graft compolymer of an acrylic monomer, at least one such copolymer being used either singly or in combination. The amount of the compound added to the overcoat layer is suitably at least 0.5 wt.%, preferably, 1-60 wt.%, from the viewpoints of chemical resistance, color forming sensitivity and printability. |
