| 摘要 |
A thermal recording element which comprises a support having thereon an opaque recording layer which comprises hollow spherical beads dispersed in a hydrophilic binder (eg gelatin or PVA) the beads having a mean diameter of 0.2 Ám to 1.5 Ám and a void volume of 40% to 90%. The recording element appears opaque when coated because of the nature of the physical structure of the recording layer, which contains voids filled with air (inside the hollow beads). On applying heat and pressure eg. by a thermal printhead, to the element, the hollow beads soften, coalesce and release the air into the voids. The resulting recording layer then becomes transparent and reveals the colour of the underlying support generating a continuous tone, monochrome image. A process of forming a single colour image from the same recording element is also disclosed. |
