| 摘要 |
FIELD: printing.SUBSTANCE: invention relates to an ink set for inkjet recording of information and the formation of full-colour images. The ink set comprises a blue ink, a purple ink, a yellow ink, and a black ink. Each ink contains at least a pigment, a surfactant, water, water-soluble organic solvent and the anionic self-emulsifying polyurethane based on ether. Each ink contains a pigment as a combination of (i) the liquid dispersion of the pigment, in which the pigment is dispersed in water using a surfactant, and (ii) the liquid dispersion of the pigment coated with a resinous polymer, in which the pigment is coated with the resinous polymer and is dispersed in water. At that (i) the liquid dispersion of the pigment and (ii) the liquid dispersion of the pigment coated with a resinous polymer satisfy the following formula: |AB| ? 30 nm, where A represents an average particle diameter (D50) of the dispersed pigment in (i) the liquid dispersion of the pigment, B represents an average particle diameter (D50) of the dispersed pigment coated with a resinous polymer, in (ii) the liquid dispersion of the pigment.EFFECT: invention provides an ink set with high image density and stability in the liquid state and at ejection.10 cl, 1 dwg, 4 tbl, 61 ex |
