Patent ID: 7868060

Claim:
An ink jet aqueous ink comprising: a water-insoluble coloring material; and a plurality of polymers, wherein the plurality of polymers comprise (i) a polymer A which relatively contributes to dispersion of the water-insoluble coloring material and (ii) a polymer B which does not relatively contribute to the dispersion of the water-insoluble coloring material as compared to the polymer A, wherein the polymer A is a block copolymer having an acid value of 120 mgKOH/g to 180 mgKOH/g and having an ethylene oxide group as a nonionic group, and wherein the polymer B has an acid value of 90 mgKOH/g to 150 mgKOH/g and a hydrogen bond parameter (δh) of the polymer obtained by solubility parameters of monomers constituting the polymer of 1.0 cal 0.5 /cm 1.5 to 3.2 cal 0.5 /cm 1.5 .