Black colorant for ink-jet printing ink, ink-jet printing ink, and aqueous pigment dispersion containing the black colorant

摘要

A black colorant for ink-jet printing ink, has an average particle diameter of 0.001 to 0.15 &mgr;m, and comprises:;extender pigments as core particles;;a gluing agent-coating layer formed on at least a part or the surface of said core particles; and;a black pigment coat uniformly formed on at least a part of said gluing agent-coating layer.;The black colorant for ink-jet printing ink exhibits not only a high blackness and an excellent tinting strength, but also excellent dispersibility and light resistance in spite of fine particles.