Patent ID: 7977408

Claim:
A recording ink, comprising: a pigment, a dispersant, a water-soluble solvent, a wetting agent, water, and water-dissolved material or water-dispered material comprising at least one of an acrylic resin, methacrylic resin, polyurethane resin and a polyester resin, wherein the resin has a mass-average molecular weight of 5,000 to 100,000, wherein the pigment comprises at least one of diketopyrrolopyrrole red pigment and phthalocyanine green pigment, wherein the dispersant is a compound expressed by Structural Formula (11): A 1 O—(CH 2 CH 2 O) k —SO 3 M 1 Structural Formula (11) in which A 1 represents one of an alkyl group having 8 to 12 carbon atoms and which may be branched, an aryl group having 6 to 18 carbon atoms, a benzyl group, a styrenated phenol group, a distyrenated phenol group and a β-naphthyl group; k represents an integer of 5 to 30, and M 1 represents one of an alkali metal, ammonium, phosphonium and alkanolamine.