The present disclosure relates to a liquid electrophotographic ink developer unit. The unit comprises a developer roller comprising a layer formed from a polymer composition containing a conductive filler, whereby the polymer composition has a specific resistivity of less than 1×10.sup.6 Ω.Math.cm. The unit also comprises a secondary roller that co-operates with the developer roller.

The present disclosure relates to a process for printing a substrate. The process comprises applying an analogue primer over a print substrate. A transparent electrophotographic composition comprising a coupling agent is electrophotographically printed on the primer as a coupling layer. An electrophotographic ink composition is then printed on the coupling layer to form an image layer. The coupling layer is disposed between the primer and image layer and in contact with each of the primer and image layer.

The present disclosure relates to a process for printing a substrate. The process comprises applying an analogue primer over a print substrate. A transparent electrophotographic composition comprising a coupling agent is electrophotographically printed on the primer as a coupling layer. An electrophotographic ink composition is then printed on the coupling layer to form an image layer. The coupling layer is disposed between the primer and image layer and in contact with each of the primer and image layer.

The present disclosure relates to a process for selectively printing an image onto a substrate. The process comprises electrophotographically printing a first ink composition onto selected areas of a substrate. The process also comprises applying a primer over at least the unprinted areas of the substrate. A second ink composition is printed onto the primer and the first ink composition is removed from the selected areas of the substrate. The first ink composition is a transparent electrophotographic ink composition.

The present disclosure relates to a process for selectively printing an image onto a substrate. The process comprises electrophotographically printing a first ink composition onto selected areas of a substrate. The process also comprises applying a primer over at least the unprinted areas of the substrate. A second ink composition is printed onto the primer and the first ink composition is removed from the selected areas of the substrate. The first ink composition is a transparent electrophotographic ink composition.

There is provided a process for heat transfer printing, comprising electrostatically printing a transparent electrostatic ink composition (3) onto a transfer material (2), wherein the transparent electrostatic ink composition comprises a thermoplastic resin; printing an image (4) on the transparent electrostatic ink composition; contacting the image with a target substrate (1) under conditions such that the thermoplastic resin of the transparent electrostatic ink composition is softened or molten, and separating the target substrate and the transfer material, to leave the target substrate having thereon the image and an overlying layer of transparent electrostatic ink composition. Also disclosed is a fabric having thereon an image, the image having an overlying layer of transparent electrostatic ink composition.

There is provided a process for heat transfer printing, comprising electrostatically printing a transparent electrostatic ink composition (3) onto a transfer material (2), wherein the transparent electrostatic ink composition comprises a thermoplastic resin; printing an image (4) on the transparent electrostatic ink composition; contacting the image with a target substrate (1) under conditions such that the thermoplastic resin of the transparent electrostatic ink composition is softened or molten, and separating the target substrate and the transfer material, to leave the target substrate having thereon the image and an overlying layer of transparent electrostatic ink composition. Also disclosed is a fabric having thereon an image, the image having an overlying layer of transparent electrostatic ink composition.

Herein is described a liquid electrophotographic adhesive composition comprising a thermoplastic resin, a moisture activatable adhesive, and a liquid carrier.

Herein is described a liquid electrophotographic adhesive composition comprising a thermoplastic resin, a moisture activatable adhesive, and a liquid carrier.

In one example, a developer roller for liquid electrophotographic printing includes a cylindrical metal inner core, a rigid conductive plastic outer core surrounding the inner core, and a compliant exterior surrounding the outer core.