| 摘要 |
PURPOSE:To eliminate rubbed scummings and to enhance the printing difinition, by providing a thermal transfer ink layer consisting of two sorts of waxes having different acid values and saponification values with each other. CONSTITUTION:A title recording medium consists of a substrate and a thermal transfer ink layer formed thereon which mainly composed of two sorts of waxes, and a colorant. The two sorts of waxes have 70-90 deg.C melting point, 5 or less penetration (25 deg.C), and 0.99-1.05 density, but have different acid values and saponification values, i.e. 120-160 and 1-20 acid values and 140-190 and 70-100 saponifications, respectively. The substrate can be so constructed as to form a heat-resistant protective layer, for example, on a plastic film or a paper base. The use of the wax out of the above range in melting point, penetration, and density, produces rubbedf scummings and lowers the printing definition. Additionally, the use of the wax within the above range in melting point, penetration, and density, but acid value and saponification value, produces irregularities in printing density and lowers printing quality. |
