Patent ID: 8852727

Claim:
An ink composition, comprising: (Component A) a compound having two or more groups each represented by the following Structural Formula (1); (Component B) a compound represented by the following Formula (2); (Component C) a coloring material; and (Component D) water: wherein, in Structural Formula (1), R a and R b each independently represent an alkyl group having 1 to 4 carbon atoms, and R a and R b may be bonded to each other to form a 4-membered to 6-membered ring; and wherein, in Formula (2), R b1 and R b2 each independently represent a hydrogen atom, an alkyl group, an aryl group, an alkenyl group, or a residue obtained by eliminating one hydrogen atom from a heterocyclic compound, and R b1 and R b2 may be bonded to each other to form a ring; Y b1 and Y b2 each independently represent a divalent group selected from the group consisting of —O—, —S—, —NR b3 —, —Se—, —C(CH 3 ) 2 —, and —CH═CH—, wherein R b3 represents a hydrogen atom, an alkyl group, an aryl group, or an alkenyl group; G b1 and G b2 each independently represent a hydrogen atom, a cyano group, an amide group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyl group, an arylcarbonyl group, an alkylsulfanyl group, an arylsulfanyl group, an alkylsulfonyl group, an arylsulfonyl group, or a fluoroalkylsulfonyl group, and G b1 and G b2 may be bonded to each other to form a ring, provided that when G b1 and G b2 form a ring, the ring may contain, in the ring, a divalent linking group selected from the group consisting of —C(═O)—, —C(═S)—, —NR 12 —, —N═CR 13 —, —O—, and —S—, wherein R 12 represents a hydrogen atom, an alkyl group, or an aryl group and R 13 represents a hydrogen atom, an alkyl group, or an aryl group; and at least one of R b1 , R b2 , Y b1 , Y b2 , G b1 and G b2 is substituted with at least one hydrophilic group.