| 摘要 |
PURPOSE:To obtain the recording solution useful for ink-jet recording and writing tools, having magenta color, excellent printing concentration, light resistance, water resistance and shelf stability, containing an aqueous medium and a monoazo-based coloring matter having a specific free acid type. CONSTITUTION:This recording solution contains (A) an aqueous medium of water and a water-soluble organic solvent (e.g. ethylene glycol or glycerol) and (B) at least one coloring matter selected from coloring matters having a free acid type of formula I [R1, R2 and R3 are 1-9C (substituted) alkyl, 1-9C alkoxy, halogen, H, hydroxyl, etc.; (m) is 0, 1 or 2; R4, R5, R6 and R7 are H, 1-18C alkyl, 1-18C alkenyl, aryl, etc., with the proviso that at least one of R4 to R7 contains COOH group as a substituent group] such as a coloring matter of formula II. The recording solution preferably contains 45-95wt.% of water, 1-50wt.% of the water-soluble organic solvent and 0.5-5wt.%, especially 2-4wt.% of the coloring matter of the component B. |
