Vivid application of polyurethane as dispersants for solvent based inkjet ink

The present article explores the usage of functionalized urethane of robust affinity to pigment through the reaction of polyurethane adduct with different types of polyether in order to improve the pigment dispersion stability, color and wetting properties. The raw materials and prepared dispersants were characterized by FTIR, GPC, Non-volatile content. The properties and dispersing ability of the dispersants were also investigated by measuring ink viscosity, Rheology, surface tension and particle size. The prepared polymeric dispersants were employed as dispersing agents for solvent-based inkjet ink application. The adhesion and color properties of prepared ink also were studied. All dispersants possessed high gloss comparing to blank after storage stability and low particle size and surface tension except PUD 5, 6, all dispersants showed no negative affect on adhesion of ink on printed PVC film and possessed excellent dispersing ability and rheological properties indicated by low ink viscosity for most commonly used cyan pigment C.I. 15:4.