Inkjet ink

An inkjet ink comprising:

• a pigment dispersion containing an organic dispersion medium, a cyan pigment having a z-average particle diameter of not more than 200 nm, first resinous dispersing agent and second resinous dispersing agent different from the first resinous dispersing agent, the organic dispersion medium being at least one polymerizable compound, the cyan pigment being at an amount ranging from 2 to 30% by weight based on the organic dispersion medium, and an ionic compound;
• wherein a ζ-potential of the cyan pigment to the at least one polymerizable compound of the organic dispersion medium is confined within the range of +30 mV to +100 mV, the first and second resinous dispersing agents being adsorbed to the cyan pigment, the ζ-potential being determined by subjecting the inkjet ink to electrophoresis;
• and
• wherein the second resinous dispersing agent is a resinous polymer dispersing agent having a basic terminal, an amine value ranging from 5 to 200 mgKOH/g and a number average molecular weight ranging from 1,000 to 100,000 and is incorporated at an amount ranging from 2 to 60% by weight based on the pigment.

An inkjet ink comprising:

• a pigment dispersion containing an organic dispersion medium, a yellow pigment having a z-average particle diameter of not more than 200 nm, first resinous dispersing agent and second resinous dispersing agent different from the first resinous dispersing agent, the organic dispersion medium being at least one polymerizable compound, the yellow pigment being at an amount ranging from 2 to 30% by weight based on the organic dispersion medium, and an ionic compound;
• wherein a ζ-potential of the yellow pigment to the at least one polymerizable compound of the organic dispersion medium is confined within the range of −15 mV to +100 mV, the first and second resinous dispersing agents being adsorbed to the yellow pigment, the ζ-potential being determined by subjecting the inkjet ink to electrophoresis;
• and
• wherein the second resinous dispersing agent is a resinous polymer dispersing agent having a basic terminal, an amine value ranging from 5 to 200 mgKOH/g and a number average molecular weight ranging from 1,000 to 100,000 and is incorporated at an amount ranging from 2 to 60% by weight based on the pigment.

An inkjet ink comprising:

• a pigment dispersion containing an organic dispersion medium, a white pigment having a z-average particle diameter of not more than 300 nm, first resinous dispersing agent and second resinous dispersing agent different from the first resinous dispersing agent, the organic dispersion medium being at least one polymerizable compound, the white pigment being at an amount ranging from 2 to 50% by weight based on the organic dispersion medium, and an ionic compound;
• wherein a ζ-potential of the white pigment to the at least one polymerizable compound of the organic dispersion medium is confined within the range of +40 mV to +100 mV, the first and second resinous dispersing agents being adsorbed to the white pigment, the ζ-potential being determined by subjecting the inkjet ink to electrophoresis;
• and
• wherein the second resinous dispersing agent is a resinous polymer dispersing agent having a basic terminal, an amine value ranging from 5 to 200 mgKOH/g and a number average molecular weight ranging from 1,000 to 100,000 and is incorporated at an amount ranging from 2 to 60% by weight based on the pigment.