Patent ID: 7135506

Claim:
A method of forming an image by an inkjet recording system using an oil based ink composition, comprising discharging an oil based ink composition from an inkjet recording device, wherein the oil based ink composition comprises fine particles dispersed in a non-aqueous dispersion medium, wherein the fine particles are obtained by melting and kneading a coloring agent and a binder resin and cooling and pulverizing the resulting mixture to provide a colored mixture and subjecting the colored mixture to wet dispersion, wherein each fine particle comprises the coloring agent and the binder resin, and wherein the coloring agent is coated with the binder resin, and wherein the coloring agent comprises a pigment wherein the binder resin comprises a block copolymer having a repeating unit (a) corresponding to a monofunctional monomer containing an aliphatic cyclic hydrocarbon group having from 5 to 30 carbon atoms, and wherein the oil based ink composition further comprises a dispersant for pigment.