Influence of different dispersants on the quality and stability of aqueous quinacridone magenta pigment dispersion for ink‐jet applications

• DOI: 10.1111/cote.12678
• Publication Date: 2023-02-06T14:34:57Z
• Authors: Rafał Gaida; Katarzyna Dziubek; Katarzyna Król; Monika Ostaszewska; Marian Wit
• Keywords: Gloss (optics); Magenta; Dispersion stability

Abstract The stability of water‐based pigment dispersions is a key factor in determining their utility ink‐jet applications, and the appropriate choice dispersant plays special role. Among formulations tested to date, literature data on magenta pigments are very limited. Thus, goal this work was study influence type loading dispersants quality quinacridone dispersions. Three different commercially available were tested: (1) cationic styrene‐maleic anhydride copolymer, (2) an anionic polyacrylate, (3) nonionic alkyl ethoxylate. Pigment dispersing agents analysed using Fourier Transform–infrared method. determined by comparative studies changes particle size, viscosity, pH, filtration time, optical density gloss during accelerated ageing test. Moreover, Turbiscan AGS LUMiFuge analysers used for evaluations instability properties each agent affected performances dispersants. highest provided (small < 60 nm; lowest viscosity mPa·s at optimal content; favourable results test; dispersability, proven gloss). indicated that all excellent (Turbiscan Stability Index values below three, no significant differences transmission profiles, respectively). However, it found measurement influenced formulations.