Abstract
Pigment distribution in latex paints has been investigated by experiments using a combination of computer modelling, experimental model systems and pigmented paints. This paper deals with the geometric effects of variables such as pigment volume concentration and latex particle size on the pigment distribution in water-borne coatings. Physico-chemical effects, such as particle surface potentials and ionic strength of the serum, are dealt with in a subsequent paper. Computer modelling and experimental model systems gave a clear picture of the geometric effects of PVC and latex particle size on pigment distribution. Higher PVC leads to a higher density of pigment in the film and consequently more crowding of pigment particles, but has no further effect on the quality of pigment distribution. Computer and physical model systems show that pigment distribution is improved by reducing the latex particle size. From purely geometric considerations, the best results should be obtained with infinitely small latex particles. A series of model paints pigmented with titanium dioxide showed that the results were valid for latex/pigment size ratios from 0.75 to 1.5.
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