| 摘要 |
PURPOSE:To arrange so that the stability of a color-forming image and heat of a ground color under high-temperature and high-humidity conditions by containing special 4-isoproboxy-4'-hydroxydiphenyl sulfone as an organic developer, and also special p-intro zinc benzoate as a stabilizer in a heat sensitive color-forming layer. CONSTITUTION:P-nitro zinc benzoate indicated by the general chemical formula (II) as a stabilizer is combinedly used with 4-isoproboxy-4'-hydroxydiphenyl sulfone shown by the formula (I). The 4-isoproboxy-4'-hydroxydiphenyl sulfone, an orga- nic developer is a chemical compound having a melting point of 129-130 deg.C. In the meantime, the p-nitro zinc benzoate is a light yellow high melting-point substance obtained through the reaction of sodium salt of p-nitro benzoate and zinc sulfate. The stabilizer is added at a ratio of 10-60wt% against 4-isoproboxy-4'-hydroxydiphenyl sulfone, an organic developer. |
