| 摘要 |
PURPOSE:To enable formation of an image with high contrast and facilitate temperature control, by using a higher fatty acid having a specified number of carbon atoms and at least one of a higher fatty acid or a higher alcohol which have specified numbers of carbon atoms, as an organic low molecular weight substances to be dispersed in a resin matrix. CONSTITUTION:A thermal recording layer is provided which comprises a resin matrix and an organic low molecular weight substance dispersed in the resin matrix as main constituents, and has a transparency reversibly changed depending on temperature. A higher fatty acid having at least 16 carbon atoms and at least one of (a) a higher fatty acid having 10-15 carbon atoms and (b) a higher alcohol having at least 12 carbon atoms are used in a weight ratio of 95:5-20:80, as the organic low molecular weight substance. The mixture shows an eutectic phenomenon when being heated. As a result, the transparentization temperature range of the thermal recording layer is changed or enlarged according to variations in the mixing ratio, whereby temperature control in transparentization of a recording material is facilitated, and it is possible to obtain a sufficient degree of transparentization even when the proportion of the organic low molecular weight substance is set to be high. |
