Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1997-09-09
1999-01-26
Gorgos, Kathryn L.
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204483, 204508, 101DIG9, C25D 1304
Patent
active
058634029
ABSTRACT:
An electrocoagulation printing method comprises the steps of (a) providing a positive electrolytically inert electrode having a continuous passivated surface moving at substantially constant speed along a predetermined path, the passivated surface defining a positive electrode active surface; (b) coating the positive electrode active surface with an olefinic substance and silica to form on the surface micro-droplets of olefinic substance containing the silica; (c) forming on the olefin and silica-coated positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of an electrolytically coagulable colloid present in an electrocoagulation printing ink comprising a liquid colloidal dispersion containing the electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte and a coloring agent; and (d) bringing a substrate into contact with the olefin and silica-coated positive electrode active surface to cause transfer of the dots of colored, coagulated colloid from the surface onto the substrate and thereby imprint the substrate with the image. The use in step (b) of silica prevents abrasion and pitting of the positive electrode, without substantially affecting passivation. The use of silica also prevents the formation of undesirable background on the printed image in step (d).
REFERENCES:
patent: 4661222 (1987-04-01), Castegnier
patent: 4895629 (1990-01-01), Castegnier
patent: 5449392 (1995-09-01), Castegnier et al.
patent: 5538601 (1996-07-01), Castegnier
patent: 5690801 (1997-11-01), Castegnier
patent: 5690802 (1997-11-01), Castegnier
patent: 5690803 (1997-11-01), Castegnier
Castegnier Adrien
Lepine Normand
Elcorsy Technology Inc.
Gorgos Kathryn L.
Mayekar Kishor
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