| 摘要 |
PURPOSE:To provide a dye compd. capable of giving a stabilized black recorded image of high density when used as a color former of a variety of recording material, by incorporating a particular fluoran derivative. CONSTITUTION:A basic dye comprising a fluoran derivative of formulaI wherein R1 and R2 are 1-12C alkyl, 1-9C aralkyl; X is H, halogen, 1-4C alkyl, 1-2C alkoxy; Y is H, halogen, 1-4C alkyl, with the proviso that X and Y are not H at the same time ; Z is H, group of formula II (wherein R3 and R4 are H, 1-4C alkyl, phenyl) . As a color former used for a recording material such as press-sensitive, heat-sensitive, conducting heat-sensitive, photosensitive, etc., it has characteristics of being excellent in stability before color development and color developing speed, of developing in dark red-black color of high density, and of allowing the resulting recorded image to maintain the initial color tone stably on exposure to sunlight. |
