Abstract: A process for the production of a pigment composition useful in pigmenting surface coating comprising:(a) milling a crude copper phthalocyanine blue pigment in the presence of 0-50% (by weight of milled materia) of a salt; and(b) subsequently treating the milled material with a polar aliphatic solvent; whereby(c) 8 to 12% by weight, based on crude pigment, of a copper phthalocyanine additive of the formula I ##STR1## wherein CuPc is the residue of copper phthalocyanine, m and n are each an integer of from 1 to 4, and R.sub.1 and R.sub.2 are each an optionally substituted alkyl group, or R.sub.1 and R.sub.2, together with the N atom to which they are bonded, form a heterocycle, is added to the crude milled pigment prior to, during or after the solvent treatment of step (b); and, (d) the pigment composition is then isolated.

Abstract: A process for the production of alpha-, beta-, and gamma-copper phthalocyanine pigments by reacting an aromatic or aromatic heterocyclic ortho-dinitrile compound and copper or a copper compound capable of providing the centrol metal atom of a phthalocyanine pigment at a temperature below 100.degree. C. in the presence of a alkaline substance in a hydrophilic aliphatic organic solvent containing one or more hydroxy groups and adding as catalyst or crystal form controller or both from the beginning of the reaction:(a) for alpha-, beta- or gamma pigments, a copper phthalocyanine in conventional pigmentary form or(b) for alpha pigments, a copper phthalocyanine derivative with a limited degree of substitution.

Abstract: A process for the production of halogenated copper phthalocyanine by heating a mixture of dry crude copper phthalocyanine, an organic solvent, a halogenating agent, a halogen transfer agent and, as catalyst, chlorosulphonic acid.