Novel bio-based polymeric dispersants for inkjet applications

 
Pigment dispersion is a critical step in the production of an inkjet ink. For inorganic particles, a milling process is generally required to reduce the particle size distribution up to sub-micrometer scale. This reduction is basic to meet the requirements of current inkjet hardware, where the nozzles have normally a dimeter of the range 1-5 microns. Additionally, inorganic particles are characterized by their high mass density, especially when they are compared with their organic countertypes. Therefore, inorganic particles are more prone to sedimentation problems. In this research, the relationship between dispersant design and its performance regarding dispersing and anti-setting properties is studied in different inkjet inks, including high solid content of inorganic pigments, carbon black, titanium dioxide, conductive particles and others. These novel bio-based hyperdispersants provide the right balance between two opposite mechanisms of steric repulsion and controlled flocculation, reducing the viscosity and giving an exceptional anti-settling performance.