HIGHLY CONCENTRATED AQUEOUS SUSPENSIONS OF MINERALS AND/OR FILLERS AND/OR PIGMENTS WITH AT LEAST 60WT% OF SOLIDS WHICH ARE STORAGE STABLE AND HAVE LOW VISCOSITIES; PROCESS FOR THEIR PREPARATION AND USE

摘要

An aqueous suspension of minerals and/or fillers and/or pigments having a solid content >/=60% by weight, the mineral or the filler or the pigment being dispersed with one or more dispersing agents, is characterized in that the dispersing agent contains one or more amphoteric polyelectrolytes and/or cationic polyelectrolytes and/or amphoteric cationoic polyelectrolytes and/or amphoteric anionic polyelectrolytes and/or partially neutralized anionic polyelectrolytes and/or partially neutralized amphoteric anionic polyelectrolytes, the filler and/or pigment and/or mineral particles carrying a charge neutral or positive to the outside. Furthermore is disclosed a process characterized in that a part of the polyelectrolytes according to the invention is added before the grinding, a part thereof may be added during the grinding and a part thereof may be added after the grinding. According to the invention grinding and dispersing is achieved in only one process step.