US Patent 9709913 Concentrating an ink composition

Herein is disclosed a method for processing a liquid electrostatic ink composition, the method comprising:providing an initial liquid electrostatic ink composition comprising chargeable toner particles dispersed in a first liquid carrier,removing at least some of the liquid carrier from the initial liquid electrostatic ink composition using supercritical fluid extraction to provide a concentrated composition comprising the chargeable toner particles,adding a second liquid carrier to the concentrated composition to form a final liquid electrostatic ink composition. Also disclosed herein is a liquid electrostatic ink composition producible according to the method.