| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an aqueous inkjet pigment dispersion capable of providing an aqueous inkjet pigment ink which hardly causes head clogging even after long-term rest, enables to easily redissolve a deposited pigment aggregate by a head cleaning operation, retains discharge stability, and is excellent in storage stability. <P>SOLUTION: The aqueous inkjet pigment dispersion contains a pigment, a pigment derivative, and a polymer dispersant. The pigment derivative is an acid pigment derivative having one or more chemically modified acid groups in its molecule. The polymer dispersant is a diblock polymer composed of a hydrophilic block and a hydrophobic block, wherein at least acrylic acid is contained as a constituent monomer of the hydrophilic block, while at least benzyl methacrylate is contained as a constituent monomer of the hydrophobic block, and the hydrophobic block has a number average molecular weight of 400-3,000. <P>COPYRIGHT: (C)2012,JPO&INPIT |
