| 摘要 |
<p>A process for producing a pigment dispersion having dispersed pigment particles in a very fine size and showing an extremely high dispersion stability with the passage of time which is appropriately usable in the fields with a need for improved color development and fluidity (for example, ink jet recording liquids, coloring compositions for color filter) and applicable to the fields of printing inks, etc. Namely, a process for producing an aqueous pigment dispersion characterized by comprising, under an elevated pressure, passing a mixture which contains a pigment, at least one member selected from the group consisting of high-molecular weight emulsifiers having an HLB of 5 or above and surfactants having an HLB of 5 or above and an aqueous vehicle through an orifice free from any curved or bent part, and then jetting the mixture into a mixture which has been preliminarily flown and pooled in a hollow member having a larger diameter than that of the orifice to thereby disperse the pigment in the aqueous vehicle.</p> |
