Liquid electrophotographic ink with a charge director system

A method of manufacturing a liquid electrophotographic ink, comprising:

• a) mixing and heating a binder and a vehicle to form a homogenous binder composition,
• b) combining a colorant with the homogenous binder composition to form a binder/colorant composition,
• c) dispersing the binder/colorant composition in an additional amount of the liquid vehicle to form a dispersion, and
• d) combining a charge director system having a primary charge component, a secondary charge component, and an electric stability additive, with the dispersion to form the liquid electrophotographic ink,
• wherein the charge director system provides the following ink conductivities:
• a high field conductivity of about 150 pS/cm to about 400 pS/cm, a low field conductivity of about 20 pS/cm to about 200 pS/cm, a direct charge conductivity less than about 30 pS/cm, and a particle conductivity of at least 130 pS/cm, and
• wherein the liquid electrophotographic ink is formulated for printing from a liquid electrophotographic printer.

A method of printing an image, comprising printing a liquid electrophotographic ink from a liquid electrophotographic printer on a substrate, wherein the liquid electrophotography ink comprises

• a) a liquid vehicle;
• b) ink particles;
• and
• c) a charge director system, comprising:
• i) a primary charge component,
• ii) a secondary charge component, and
• iii) an electrical stability additive;
• wherein the charge director system provides the following ink conductivities:
• a high field conductivity of about 150 pS/cm to about 400 pS/cm, a low field conductivity of about 20 pS/cm to about 200 pS/cm, a direct charge conductivity less than about 30 pS/cm, and a particle conductivity of at least 200 pS/cm.