Patent ID: 8740371

Claim:
An inkjet recording ink set, comprising: a black pigment ink; and at least one color pigment ink comprising one or more colors, wherein the black pigment ink comprises a first anionic self-emulsifying ether polyurethane resin having an acid value of 65 mgKOH/g to 85 mgKOH/g, and each color pigment ink comprises a second anionic self-emulsifying ether polyurethane resin having an acid value which is 10 mgKOH/g to 40 mgKOH/g lower than the acid value of the first anionic self-emulsifying ether polyurethane resin comprised in the black pigment ink wherein the black pigment ink further comprises carbon black and the carbon black has a volatile component of 8.0% to 12.0%.