Ciba-geigy Corporation

Ronald Barraclough

Robert Langley

A process for the production of a pigment composition useful in pigmenting surface coating comprising:

Process for the production of a pigment composition

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:

Preparation of .alpha.- .beta.- and .gamma.-copper phthalocyanine

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.

Growing community of inventors

Jonstone, United Kingdom

Ronald Barraclough