To provide a method of dispersing an aqueous inkjet ink fluid which can secure the dispersion stability of a pigment in an inkjet ink, is hard to cause the aggregation of the pigment even in a long-term retention of the liquid, is thereby hard for the aggregation to cause clogging on injecting the ink, and enables achievement of a stabilized printing density without lacking an image in the printing quality of minute letters and the like to be indicated in a black ink.
The method of dispersing an aqueous inkjet ink fluid comprises dispersing an organic pigment into a solvent by a media-type dispersion machine with the use of ceramic beads as media, the ceramic beads having a total of iron oxide, magnesium oxide, and sodium oxide mixed therein as impurities of 0.01-0.3 mass%.
COPYRIGHT: (C)2007,JPO&INPIT
IIJIMA HIROTAKA
SASAKI KUNITSUNA
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