INKJET PRINTING INK, INKJET PRINTING INK SET, AND INKJET PRINTING METHOD AND INKJET PRINTER USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a pigment-dispersed type inkjet printing ink and inkjet printing ink set attaining high optical density while keeping pigment dispersion stability, causing no clogging in an ink flow path or nozzle in printing operation, and giving various print qualities including fixing intensity, water resistance and light resistance, and to provide an inkjet printing method and an inkjet printer using the above ink or ink set.;SOLUTION: The inkjet printing ink comprises water, a pigment self-dispersible in water, a water-miscible organic solvent, and a nonionic polymer, wherein the amount of the nonionic polymer is 5-200 wt.% based on the amount of the pigment, the nonionic polymer is preferably e.g. a polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, poly-N-vinyl acetamide, and the absolute value of the zeta-potential of the ink is preferably 5-30 mV.;COPYRIGHT: (C)2005,JPO&NCIPI