Patent ID: 8616695

Claim:
An ink jet ink, being used for an ink jet recording system in which the ink is ejected from a recording head by an action of thermal energy, comprising a monoazo pigment and a resin, wherein: the monoazo pigment comprises a self-dispersible pigment having an anionic group bonded to a particle surface of the pigment directly or via another atomic group and has a surface charge amount of 5.9Ã—10 âˆ’2 mmol/g or more and 9.8Ã—10 âˆ’2 mmol/g or less; the resin has an acid value of 100 mg KOH/g or more and 160 mg KOH/g or less; and a mass ratio of a content (mass %) of the resin to a content (mass %) of the monoazo pigment in the ink is 0.05 times or more and 0.25 times or less.