| abstract |
The coarse particles present in the aqueous pigment dispersion are greatly reduced, making it possible to refine the dispersed particles and to improve the dispersion stability, and as a result, the improvement of the storage stability and the good ejection stability when the aqueous ink for inkjet recording is produced. In addition, it aims at providing the manufacturing method of the aqueous pigment dispersion liquid with high manufacturing efficiency. In order to achieve the above object, a mixture containing a quinacridone pigment (a), a styrene-acrylic acid copolymer (c), a basic compound (d) and a polyoxyalkylene glycol or a derivative thereof (e) is kneaded, and room temperature An aqueous pigment having a kneading step of producing a pigment dispersion which is a solid in the present invention, and a mixing step of mixing the aqueous medium with the pigment dispersion to lower the viscosity and liquefying the pigment dispersion. Provided are methods for preparing the dispersion. |