Patent ID: 7374278

Claim:
A water-based ink comprising a colored microparticle dispersion having water and a microparticle containing a resin and a colorant, wherein the microparticle has a core part and a shell part to form a core-shell structure made of resin and the core part and the shell part are cross-linked with a cross-linking agent, and the core part comprises the colorant; and the resin contained in the microparticle has a group represented by General Formula (1): -(EO) m -(PO) n -(TO) p -R General Formula (1) wherein EO represents an ethylene oxide group, PO represents a polygene oxide group, and TO represents a tetramethylene oxide group, and each is subjected to random or block copolymerization; each of the ethylene oxide group, the propylene oxide group, and the tetramethylene oxide group represented by EO, PO, and TO, respectively, may be further substituted; each of m, n, and p is an integer of 0-500 in which 2≧m+n+p≧500 is held; and R represents a hydrogen atom, a hydroxyl group, an alkyl group, an aryl group, or a heterocyclic group.