Process for preparation of liquid electrostatic developers

Process for the preparation of toner particles for liquid electrostatic imaging comprising (A) mixing a thermoplastic resin and a nonpolar liquid at a temperature sufficient to plasticize and liquify the resin and below that at which the nonpolar liquid boils and the resin decomposes, (B) cooling the mixture to form resin particles in the nonpolar liquid, (C) reducing the size of the resin particles to below about 30 mu m by passing the product of step (B) through at least one liquid jet interaction chamber at a liquid pressure of at least 1000 p.s.i., e.g., a Microfluidizer TM . The process produces liquid electrostatic developer quicker than other known processes, the developer being useful in copying, making proofs, including digital proofs, etc.