|
(11) | EP 0 899 093 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Method and coating agent for electrocoagulation printing |
| (57) An improved electrocoagulation printing method comprises the steps of a) providing
a positive electrode having a passivated surface moving at substantially constant
speed along a predetermined path; b) coating the positive electrode surface with a
coating agent containing silicon oxide and an oily substance to form on the surface
micro-droplets of the coating agent; c) forming on the positive electrode surface
having micro-droplets thereon a plurality of dots of coagulated ink representative
of a desired image, by electrocoagulation of an electrolytically coagulable printing
ink comprising an electrolytically coagulable polymer, a liquid medium, a soluble
electrolyte and a coloring agent; and d-1) bringing a substrate into contact with
the positive electrode surface to cause transfer of the dots of coagulated ink from
the positive electrode surface onto the substrate and thereby imprint the substrate
with the image. The method prevents anode abrasion and pitting during electrocoagulation printing. |