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A process for the preparation of pigmentary forms of phthalocyanine and of insoluble polycyclic compounds, wherein the crude pigment is milled in the presence of one or more acids which have a pK of m

A process for the preparation of pigmentary forms of phthalocyanine and of insoluble polycyclic compounds, wherein the crude pigment is milled in the presence of one or more acids which have a pK of m

대표청구항 ▼

In a process for the preparation of an easily dispersible and deeply colored pigmentary form of a phthalocyanine selected from the group consisting of metal-free phthalocyanine, metalized phthalocyanines containing up to 2 chlorine or bromine atoms in the molecule, and polyhalophthalocyanines, by co

In a process for the preparation of an easily dispersible and deeply colored pigmentary form of a phthalocyanine selected from the group consisting of metal-free phthalocyanine, metalized phthalocyanines containing up to 2 chlorine or bromine atoms in the molecule, and polyhalophthalocyanines, by comminuting the crude pigment under shearing stress and impact stress in the absence of milling assistants, converting the milled material to a pigmentary form by recrystallization in organic solvent, and isolating the pigment, the improvement which comprises comminuting the crude pigment in the presence of from 0.5 to 15 percent by weight, based on crude pigment, of one or more acids which have a pK of and are non-oxidizing under the milling conditions until the primary particle size is not greater than 0.1 mm.