Patent ID: 8888267

Claim:
A non-aqueous pigment dispersion comprising: a non-aqueous dispersion medium, a polymeric dispersant, a pigment, and a dispersion synergist; wherein the dispersion synergist is represented by Formula (I): wherein R 1 , R 2 , R 3 , R 4 , and R 5 are each independently selected from the group consisting of hydrogen, methyl, ethyl, halogen, methoxy, ethoxy, —CONH-phenyl, and —NO 2 ; and the pigment is selected from the group consisting of an azo pigment containing a benzimidazolone group, an azo pigment containing a quinoxalinedione group, a diketopyrrolo-pyrrole pigment, an unsubstituted quinacridone, a dichloro substituted quinacridone, and mixed crystals thereof, with the proviso that the mixed crystal of the unsubstituted quinacridone and/or the dichloro substituted quinacridone does not contain dimethyl substituted quinacridone.