| 摘要 |
PURPOSE:To increase the density of black color formation and to improve fastness to light and changes in the color tone, by incorporating a zinc compound, a thiourea compound and a bisphenol compound into the developer layer of a developing sheet in addition to activated clay. CONSTITUTION:3-20pts.wt. zinc compound, 1-30pts.wt. thiourea compound and 0.1-5pts.wt. bisphenol compound are compounded with 100pts.wt. activated clay and 10-40pts.wt. binder is used with 100pts.wt. total solid matter, to obtain a coating liquid of a developer, which is then applied onto a support. Zinc carbonate is preferable as the zinc compound, trimethylthiourea or diethylthiourea as the thiourea compound and 2,2'-bis(4'-hydroxyphenyl)propane[bisphenol A]as the bisphenol compound. Fluorane dyes are used as the black color forming dye of a transfer sheet combined with the developing sheet. |
