| abstract |
A water-based ink for inkjet recording, which contains a quinacridone solid solution pigment and has a low water content of 40 to 60% by weight of water, and a method for producing the same. [1] An aqueous ink containing 1 to 20% by weight of a quinacridone solid solution pigment composed of unsubstituted quinacridone and dichloroquinacridone and 40 to 60% by weight of water, by powder X-ray diffraction using a CuKα radiation source. The water-based ink for inkjet recording, wherein the measured crystallite diameter of the solid solution pigment is 270 mm or more and the ratio of (crystal peak intensity / halo pattern intensity due to the amorphous phase) is 4 or more, and [2] the solid solution The pigment is heat-treated at 70 to 150 ° C. for 24 hours or more, and then a mixture of the water-insoluble polymer, the organic solvent and water is dispersed to obtain a dispersion of particles composed of the water-insoluble polymer containing the pigment. After that, the organic solvent is removed, and the polymer is crosslinked with a crosslinking agent. A method for producing a water-based ink. [Selection figure] None |