Patent ID: 6423132
Filing Date: 2002-07-23
Classification: C09B

Abstract:
Pigment granules with a particle size from 0.5 to 4 mm, which consist of at least 90% by weight of at least one organic pigment selected from the group consisting of diketopyrrolopyrrole, quinacridone, perylene, indanthrone, flavanthrone, isoindolinone and aminoanthraquinone pigments and from 0 to 10% by weight of a binder having from 2 to 7 mol of carboxyl groups per 1000 g and from 0 to 5% by weight of a neutral emulsifier which does not form ions and which dissolves to give a clear solution in water or a C1-C4alcohol at a concentration of at least 10 g/100 ml, the binder and the emulsifier togther accounting for not more than 10% by weight and all percentages by weight being based on the overall amount of pigment granules, wherein the pigment present in the pigment granules has a particle size of from 0.01 to 10 &mgr;m, with the proviso that said granules have a bulk volume not substantially increased by voids left by gas bubbles introduced before granulation and retained in the granules upon drying.