SURFACE-CHEMISTRY BEHAVIOR OF MODIFIED CA CO3 FILLERS

The adsorption of stearic acid on CaCO3 filling materials is of the mu ltilayer type, whereby the monolayer thickness is proportional to the surface area of the filling material and it is also firmly attached. A t modifier concentrations exceeding those needed for the formation of the monolayer the hydrophilicity increases, due to a head-tail orienta tion of the modifier. The adsorption of isopropyl triisostearoyl titan ate on CaCO3 filling materials is of the monolayer type, whereupon a p roportionality to the filling materials surface area is observed. With an increasing modifier concentration increases the hydrophobicity.