Patent ID: 7459016
Filing Date: 2008-12-02
Classification: C09B,C09D,G03G

Abstract:
1. A method for the production of a phthalocyanine pigment preparation, comprising the steps of finely dividing a crude phthalocyanine pigment by a method selected from the group consisting of dry grinding, wet grinding, salt kneading, acid pasting and acid swelling to form a prepigment and subjecting the prepigment to a finish treatment in a mixture of water and an organic solvent at alkaline pH, at a temperature between 50° and 250° C. and in the presence of at least one pigment dispersant selected from the group consisting of phthalocyaninesulfonic acids, phthalocyaninecarboxylic acids, phthalocyaninesulfonic salts, phthalocyaninecarboxylic salts and phthalocyaninesulfonamides.