INTERACTIONS IN COATINGS FORMULATIONS .3. THE INFLUENCE OF HYPERDISPERSANT SYSTEMS ON THE FORMULATION AND PROPERTIES OF SELECTED PIGMENT PASTE ASSEMBLIES

The studies described herein relate to the nature of assembled paste c oncentrates containing rutile TiO2 in each of two liquids, namely meth oxypropyl acetate and toluene. The approach taken involved the use of inverse gas chromatography, adsorption behaviour, size exclusion chrom atography and thermal analysis. Stability criteria were established fo r pastes which had been let-down in various media. In general, EFKA 40 1 dispersant was found to be the more generally sympathetic and forgiv ing dispersing agent. However, its behaviour is not simple. This was s hown through breakdown patterns associated with the dispersant during formulation.