Patent ID: 6890378

Claim:
An inkjet ink, comprising a coloring material, a water-soluble organic solvent, water, a first nonionic substance that has acetylene bonds in the molecules thereof and that also has hydroxyl groups and/or alkylene oxide repeating structures, and a second nonionic substance that has lipohilic units comprising alkyl groups or cycloalkyl groups and that also has alkylene oxide repeating structures; wherein the first and second nonionic substances comprise a substance whose structure is shown by formula (IA) below, and a substance whose structure is shown by formula (IIA) below where R 1 , R 2 , R 3 , and R 4 are each independently a methyl ethyl, propyl, or butyl group; A and B are each independently an ethylene oxide group, a propylene oxide group, or an ethylene oxide group and a propylene oxide group; and j+k (average value)≦50 R 5 —(PO) n -(EO) m —OH Formula (IIA) where R 5 is an alkyl or cycloalkyl group with a carbon number of 4 to 20; PO is a propylene oxide group; EO is an ethylene oxide group; n and m are repeating units in a molecule; 0.5≦n≦5; 3≦m≦30; and EO and PO can have any sequence, and wherein the substance whose structure is shown by formula (IIA) is added in an amount of 0.1 to 10 times the amount of the substance whose structure is shown by formula (IA).