Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Aqueous ink of pigment type
 An aqueous pigment ink is provided made of a pigment, a dispersant, water, and a water-soluble solvent, wherein the dispersant contains a copolymer of a monomer (a) represented by formula (A), and one or more monomers (b) selected from the group consisting of compounds represented by formulae (B) and (C): ##STR1## Wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, AO, m.sub.1, m.sub.2, n, M.sub.1, M.sub.2 and Y are as defined herein that gives improved jettability, storage stability and printing characteristics. 
Kao Corporation
C C
C09K C09D
inventional inventional
Hideki Shigemi Kenji
Yanagi Wakabayashi Kaida