Key words: Pigment, dispersion, encapsulation, aggregation
Abstract. The use of organic pigments rather than dyes for printing inks applications with aqueous systems gives an adequate response in terms of image durability. The main issue with pigments for printing applications is the low stability of their suspensions. Due to the hydrophobic character or high surface energy of the particles, they tend to aggregate into bigger particles and sediment. In this paper we present a study of particles size, zeta potential, absorbance and other properties of suspensions prepared with hybrid (intercalated dye-clay) pigment.
A stability study was carried out by an encapsulation with anionic [poly (sodium 4-styrenesulfonate), PSS] and cationic [Poly (diallyldimethylammonium-chloride), PDADMAC] polyelectrolytes to improve the stability of the pigment particles suspensions. Preliminary studies indicate that suspensions coated with a Layer of PDADMAC improve their stability.