Patent ID: 7513944

Claim:
A black ink composition comprising (1) water, (2) carbon black, and (3) a fine particle emulsion, wherein (A) the content of said carbon black is less than 0.4 wt %, and wherein (B) the solid content of said fine particle emulsion is 20 times or more the content of said carbon black, wherein said fine particle emulsion comprises a polyalkylene emulsion, an emulsion containing a pH-adjusted resin as a resin component or both and wherein said pH-adiusted resin is obtained by a process comprising the steps of: polymerizing an ethylenically unsaturated carboxylic acid monomer and another monomer copolymerizable with said ethylenically unsaturated carboxylic acid monomer in the presence of an alcoholic hydroxyl group-containing water-soluble polymer compound or a copolymerizable surfactant to give a copolymer having an acid value of 40 or less; and adjusting the pH of said copolymer with an inorganic base.