Selective printing
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.
1. A process for selectively printing an image onto a substrate, said process comprising
electrophotographically printing a first ink composition onto selected areas of a substrate, wherein the first ink composition is a transparent electrophotographic ink composition,
applying a primer over at least the unprinted areas of the substrate,
printing a second ink composition onto the primer, and
removing the first ink composition from the selected areas of the substrate.
2. A process as claimed in claim 1 , wherein the primer coat is applied over unprinted areas of the substrate and over the first ink composition printed on the substrate.
3. A process as claimed in claim 2 , wherein the first ink composition is removed from the selected areas of the substrate together with the primer and second ink composition covering the selected areas of substrate.
4. A process as claimed in claim 1 , wherein the first ink composition is removed by:
contacting the substrate with a further substrate, and
applying heat to transfer the first ink composition and any primer and/or second ink composition covering the selected areas of the substrate to the further substrate.
5. A process as claimed in claim 4 , wherein, on application of heat, the second substrate becomes imprinted with an image comprising a layer of the second ink composition, a layer of primer disposed over the layer of the second ink composition and a layer of the first electrophotographic ink composition disposed over the layer of primer.
6. A process as claimed in claim 5 , wherein the further substrate is formed from a polymeric film.
7. A process as claimed in claim 6 , which further comprises bonding parts of the polymeric film of the substrate together, or bonding parts of the polymeric film of the further substrate together to form a seam.
8. A process as claimed in claim 4 , wherein the further substrate is formed from a polymeric film.
9. A process as claimed in claim 8 , which further comprises bonding parts of the polymeric film of the substrate together, or bonding parts of the polymeric film of the further substrate together to form a seam.
10. A process as claimed in claim 1 , wherein the substrate is formed of a polymeric film.
11. A process as claimed in claim 10 , which further comprises bonding parts of the polymeric film of the substrate together, or bonding parts of the polymeric film of the further substrate together to form a seam.
12. A process as claimed in claim 1 , wherein the substrate is treated by corona discharge prior to electrophotographically printing the first electrophotographic ink composition onto the substrate.
13. A process as claimed in claim 1 , wherein the second ink composition is an electrophotographic ink composition comprising a colorant.
14. A process as claimed in claim 1 , wherein the first ink composition is a transparent electrophotographic ink composition comprising a thermoplastic resin.
15. A process as claimed in claim 1 , wherein the transparent electrophotographic ink composition is devoid of colorant.
16. A process as claimed in claim 1 , wherein the first ink composition and the second ink composition are liquid electrophotographic compositions comprising charge directors and/or charge adjuvants.