ADSORPTION IN LATEX PAINTS IN RELATION TO SOME OF THE PROPERTIES OF THE MILL BASE AND THE FINAL COATING

The rheological properties, gloss, hiding power, and water absorption of some model latex paints were analyzed in terms of the adsorption of surfactants, dispersing agent, and thickener onto the latex and pigme nt particles. Special attention was paid to the order of addition of p oly(acrylic acid) and ethyl(hydroxyethyl) cellulose, because this has an effect on the adsorption of the polymers onto the TiO2 pigment. The order of addition also affects the rheological properties of the mill base dispersion and the gloss of the paint. The gloss was also affect ed by the surfactant used to stabilize the latex. Higher gloss was obt ained using a nonionic surfactant than with an anionic surfactant.