PREPARATION OF EPSILON COPPER PHTHALOCYANINE OF SMALL PRIMARY PARTICLE SIZE AND NARROW PARTICLE SIZE DISTRIBUTION BY KNEADING

摘要

A process of preparing copper phthalocyanine particles exhibiting a e crystallographic form, comprising a kneading step by kneading at at least two different temperatures copper phthalocyanine particles wherein more than or equal to 50 wt % of the particles exhibit an a crystallographic form in presence of a liquid and of at least one inorganic salt.