Production of pigments

Details Production of pigments Production of pigments

C - Chemistry, Metallurgy

09

B

260/160, 260/165

C09B 29/00 (2006.01) C09B 31/02 (2006.01) C09B 35/00 (2006.01) C09B 35/10 (2006.01) C09B 41/00 (2006.01) C09B 67/22 (2006.01) D06P 1/04 (2006.01)

Patent

CA 1141755

Abstract A process for producing monoazo or disazo pigments, which process comprises a) adding to a solution of a diazonium and/or tetra- zonium salt of an aromatic or heterocyclic amine a solution or suspension containing 0.1 - 50 % by weight of the theoretically required total weight of one or more coupling components, and b) completing the coupling reaction by adding the partially coupled product obtained seconding to step a) to a solution or suspension of one or more coupling components identical to or different from those used in step a). Compared with products produced by conventional methods, the pigments produced in the manner described above have a greater colouring strength, improved transparency, improved flow properties, and a higher degree of purity and dispersibility.

364055

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