Preparation agents

A method for preparing a processing aid comprising the steps of:

• preparing an aqueous dispersion by dispersing 20 to 60% by weight of the aqueous dispersion of at least one inorganic solid selected from the group consisting of pigments and fillers into an aqueous premix comprising water and 0.2 to 50% by weight of carrier material relative to the inorganic solids content of the finished processing aid to form said aqueous dispersion;
• said carrier material comprising an organic substance selected from the group consisting of a polyol, a polyglycol, a polyether, a dicarboxylic acid, a derivative of a dicarboxylic acid, adipic hexamethylenediamine salts, caprolactam, paraffin, a phosphoric acid ester, a hydroxycarboxylic acid ester and cellulose;
• wet grinding said aqueous dispersion to form particles having an average particle size d50 of from 0.1 to 0.8 microns to form an aqueous suspension;
• separating and removing particles greater than 1 micron from said aqueous suspension and
• drying said aqueous suspension to form the processing aid, said processing aid comprising said inorganic solid embedded in said carrier material.