| 摘要 |
PURPOSE:To obtain a leuco dye color developer realizing a recording superior in color forming properties, resistance to fading, and light fastness by using a mixture of alumina and oxides of IVb group in the periodic table or a mixture of alumina, oxides of IVb group in the periodic table, and SiO2. CONSTITUTION:The use of alumina and at least one of oxides of IVb group in the periodic table, such as TiO2 and ZrO2 or the use of a mixture of alumina, at least one of oxides of IVb group of the periodic table, e.g. TiO2 and ZrO2 and SiO2 as a leuco dye developer enhances color forming properties, resistance to fading, and light fastness. Furthermore, the high whiteness of alumina, oxides of IVb group in the periodic table, e.g. TiO2 and ZrO2, and SiO2 enables a favorable image to be obtained. |
