| 摘要 |
PURPOSE:To contrive to enhance stability to water and chemicals, by using a mixture of a specified bisphenol compound and a specified thioether compound as a color developer for a leuco dye. CONSTITUTION:In a heat-sensitive color producing layer comprising a leuco dye and a color developer for the leuco dye and provided with a protective layer on its surface, a mixture of a bisphenol compound and a thioether compound represented respectively by formulasI, II is used as the color developer. The weight ratio of the amount of the bisphenol compound to that of the thioether is preferably about 9:1-3:7. These compounds are mixed with the leuco dye, a binder, a filler and other additives, the resultant mixture is added to an aqueous medium together with a protective colloid substance such as polyvinyl alcohol and a surface active agent, followed by pulverization and dispersing to prepare a dispersed liquid, which is applied onto a base and is dried. The recording paper obtained in this manner is excellent in heat-sensitive color producing property, water resistance and preservability. |
