Patent ID: 8889763

Claim:
An ink jet ink comprising: a pigment; an aqueous medium; and a dispersion polymer for the pigment, wherein the dispersion polymer is a star polymer having a structure represented by at least one formula selected from the group consisting of the following general formulae (1) to (3): R 1 —(S—R 1 ′) n1 General formula (1) R 2 —(X—S—R 2 ′) n2 General formula (2) R 3 —(O—X—S—R 3 ′) n3 General formula (3) where R 1 to R 3 each represent a trifunctional or higher functional organic residue containing no ester bond, X represents an alkylene group, R 1 ′ to R 3 ′ each represent a copolymer chain of at least one monomer selected from the group consisting of aromatic (meth)acrylates and aromatic (meth)acrylamides and at least one monomer selected from the group consisting of acid monomers and salts of the acid monomers, and n 1 to n 3 each represent an integer of 3 or more.