Patent ID: 8474963

Claim:
An inkjet recording ink comprising: a carbon black; a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate in which a total amount of a dimer, trimer and tetramer of naphthalenesulfonate is 20% by mass to 80% by mass with respect to the total amount of the condensate; resin emulsion; and water, wherein the resin emulsion comprises a resin which is at least one of a urethane resin and a styrene-acryl resin, and wherein the ink satisfies the following relationship: 20≦ B−A≦ 50, where A(nm) represents a particle diameter D90 of particles in dispersion comprising the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles in the ink.