申请人:NICCA CHEMICAL CO., LTD.
公开号:EP0616897A2
公开(公告)日:1994-09-28
A heat-sensitive recording material comprises a heat-sensitive color forming layer which is formed on a supporter and contains a colorless or light color leuco dyestuff as a color forming substance, a developer which develops color of the leuco dyestuff by reaction with it when heated and a sensitizer. The developer is 2,4'-dihydroxydiphenylsulfone having purity of 97 weight % or more and prepared by washing and drying crystal which is obtained by dissolving crude 2,4'-dihydroxydiphenylsulfone in an alcohol having 1 to 4 carbon atoms or in a mixture of an alcohol having 1 to 4 carbon atoms and water by heating and then cooling the solution or partially removing the solvent from the solution by distillation. The heat-sensitive recording material has excellent properties, such as reduced fog and excellent image preservation (weatherability).
一种热敏记录材料包括一个热敏颜色形成层,它形成在一个支撑体上,含有作为颜色形成物质的无色或浅色白光染料、一个显影剂(加热时通过与白光染料反应使其显色)和一个敏化剂。显影剂是纯度大于等于 97% 的 2,4'-二羟基二苯砜,通过洗涤和干燥结晶制备而成,其制备方法是将粗 2,4'-二羟基二苯砜溶解在具有 1 至 4 个碳原子的醇中或具有 1 至 4 个碳原子的醇和水的混合物中,加热然后冷却溶液或通过蒸馏从溶液中去除部分溶剂。热敏记录材料具有优异的性能,如减少雾气和优异的图像保存性(耐候性)。