Described herein is a liquid electrostatic ink composition. The composition may comprise: a. a carrier liquid; and b. chargeable particles suspended in the carrier liquid, wherein the chargeable particles comprise a thermoplastic resin formed from the reaction of a first resin and a second resin, wherein i. the first resin comprises a polymer having acidic side groups; and ii. the second resin comprises an epoxy resin component and an elastomeric component, wherein the epoxy resin component has one or more epoxide groups per molecule.