| 摘要 |
PURPOSE:To contrive to enhance fastness of a developed color image and color forming sensitivity, by a method wherein an organic compound having a specified melting point or an organic compound starting to be melted in a specified temperature range when being heated together with a polyvalent metal salt of an organic carboxylic acid is incorporated into a thermal color forming layer. CONSTITUTION:A color former consisting of a uniform mixture of an electron- donative colorless dye and an organic polymeric compound compatible with the dye and a polyvalent metal salt of organic carboxylic acid (color developer) are individually dispersed in a water-soluble polymer (binder) by using a means such as a ball mill. An organic compound having a melting point in the range of 50- 120 deg.C or an organic compound starting to be melted in a temperature range of 50-120 deg.C when being heated together with the salt, (sensitizer), is also dispersed in a similar manner. After dispersion is completed, the three dispersions are mixed with each other to produce a heat-sensitive coating liquid, which is applied to a base, and is dried to obtain a thermal recording material. |
