| 摘要 |
PURPOSE:To enhance thermal responsiveness and dot reproduction characteristics, by sequentially providing a first undercoat layer comprising hollow particles, a second undercoat layer comprising an organic compound having a specified melting point and a pigment, and a thermal color forming layer, on a base in a laminate form. CONSTITUTION:Hollow particles to be incorporated in a first undercoat layer may be formed of, for example, a glass, a ceramic or a plastic. An organic compound having a melting point of at least 50 deg.C to be added to a second undercoat layer is preferably an ether, ester or amide compound of any of formulas (I)-(IV), whereas a pigment is particularly preferably one which has an oil absorption specified by JIS-K5101 of at least 40cc/100g. In providing a thermal color forming layer, a color former and a color developer are dispersed in an aqueous solution of a water-soluble high molecular weight compound, and are mixed with a sensitizer added thereto, then the oil-absorptive pigment is added to the resultant mixture, and if required, a surfactant, a binder, a wax, a metallic soap, an anti-oxidant, a UV absorber or the like is added to the mixture to obtain a coating liquid for forming the thermal forming layer. The coating liquid is applied to the undercoat layer, followed by drying and calendering to impart smoothness, whereby a thermal recording material can be obtained. |
