Patent Number: 7,101,919

Title: Inkjet, inkjet cartridge containing the inkjet ink, inkjet recording apparatus using the inkjet ink, inkjet recording method using the inkjet ink, and image formed by the inkjet recording method

Abstract: An inkjet ink including water; a particulate pigment; a dispersant; and an emulsion, wherein the particulate pigment has an average particle diameter (D50) not greater than 100 nm, and the standard deviation of particle diameter distribution of the particulate pigment is less than one half of the average particle diameter (D50). An inkjet cartridge containing the inkjet ink. An inkjet recording apparatus including the inkjet cartridge and a carriage configured to carry the ink cartridge. An inkjet recording method including discharging the inkjet ink from a nozzle of a recording head to form an ink image on a recording paper. An image formed on a recording material in accordance with the inkjet recording method.

Inventors: Hasegawa; Shin (Numazu, JP), Taniguchi; Keishi (Susono, JP), Hakiri; Minoru (Numazu, JP), Hosogi; Yasuyuki (Numazu, JP)

Assignee: Ricoh Company Limited

International Classification: C09D 11/10 (20060101); C08L 75/04 (20060101); C08L 83/06 (20060101)

Expiration Date: 9/05/02018