Hans-Tobias Macholdt

Charging effects of organic pigments in electrophotographic toners

Abstract Electrophotographic copying and printing is becoming more extensively used worldwide. The ‘electronic printing ink’ for electrophotography is calledtoner and until recently only black copies and prints were available. However, colour hard copy is now becoming increasingly attractive and organic pigments can be used to give colour to the toner. They do, however, also influence the toner chargeability. For this reason we have investigated the influence of organic pigments on the electrostatic chargeability of xerographic toners. These charging effects were studied by measuring Q / M-values of test toners consisting only of toner resin and 5% pigment. By use of this method, a correlation between toner chargeability and the incorporated pigment is apparent.