Patent ID: 7579390

Claim:
An inkjet ink composition comprising: a pigment component having a resin comprising a basic terminal adsorbed thereto, the basic terminal having a basicity of not more than 4 pKb, the pigment component having an average particle diameter of 200 nm or less, the resin being selected from the group consisting of vinyl polymer or copolymer, acrylic polymer or copolymer, polyester, polyamide, polyimide, polyurethane, silicon-containing polymer, sulfur-containing polymer, fluorine-containing polymer and epoxy resin; a photo-acid generating agent containing an onium salt selected from the group consisting of aryl sulfonium fluorophosphate and aryl iodonium fluorophosphates, each consisting of a monovalent salt and a multivalent salt; and at least one kind of solvent which can be polymerized under the presence of an acid; wherein the content of the multivalent salt included in the onium salt is not more than 20% by weight based on a total weight of onium salt; and wherein the content of the pigment component is confined within the range of 3 to 41% by weight based on the ink composition.