TREATMENT OF PIGMENTS WITH AMINES

摘要

Case 3-11455/MA 1718/+ Canada TREATMENT OF PIGMENTS WITH AMINES A process for the treatment of an azo pigment comprises contacting the pigment with an aromatic, aliphatic or cycloaliphatic amine maintaining the temperature above the melting point of the amine compound and subsequently contacting the pigment and amine composition with water at a pH such that the amine is completely dissolved in the water and isolating the amine free pigment.