| abstract |
In the use of liquid ink, it is an object of the present invention to provide a phthalocyanine pigment composition having remarkably excellent aging stability in addition to having excellent transparency, gloss, and viscosity aptitude at the initial stage of production. Copper phthalocyanine, a rosin compound, copper phthalocyanine sulfonic acid or a salt thereof, and an aliphatic amine, and the use of a copper phthalocyanine pigment composition, characterized in that the calcium content in the pigment composition is 200 ppm or less, is used in the base ink for liquid ink, providing excellent transparency. In addition to having good viscosity, gloss, and initial viscosity, it has remarkably excellent aging stability. |