Easily dispersing phthalocyanine blue

摘要

Copper phthalocyanine blue pigments are produced by (A) grinding, 1. copper phthalocyanine blue crystals with 2. an inorganic salt and digesting the ground copper phthalocyanine blue in water containing a strong mineral acid. (B) separately preparing an emulsion by dissolving 1. a resin in 2. an organic solvent, 3. an emulsifying agent and 4. water (C) mixing 1. the emulsified resin with 2. the digested ground copper phthalocyanine pigment and (D) separating the pigment from the other materials.