The critical pigment volume concentration concept for paper coatings: I. Model coating systems using plastic pigments and latex binders for parer coating applications

摘要

The immobilization and consoldation of the model coatings based on the plastic pigment and latex binder of known particle sizes were theoretically studied in terms of the dense random packing of binary spheres and varying extent of latex film strinkage. The porosity of the model coatings was caluclated based on three proposed latex shrinkage model: Maximum, Minimum, and Linearly Decrasing Latex Shrinkage. The increasing extent of latex shrinkage was calculated up to the critical pigment volume concentration (CPVC) as a function of plastic pigment volume fractions, and the maximum latex shirnkage was estimated from the CPVC. Also, the number of pores and the average equivalent spherical proe diameters were calculated based on thoes proposed models. The opacity and gloss of the model coatings on polyester films were measured and their prosity was also determined by a simple coat weight-thicness method.