Offset transfer of toner images in electrography
AssigneeMinnesota Mining and Manufacturing Company
InventorsGregory E. Zwaldo, Roger I. Krech, Donald L. Knutson
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Abstract
An electrographic imaging process is performed by generating an electrostatic image, contacting the image with a temporary receptor sheet comprising a carrier layer, releasable release layer, and transferable adhesive layer secured to said release layer. The image is adhered to the adhesive surface, and that surface with the image thereon is then contacted with a final receiving (receptor) surface. The adhesive layer secures the toner image, adhesive layer, and the release layer (now a top protective layer) to the final receiving surface to generate the final image.
Claims20
A process for electrographic multitoned image transfer comprising the steps of
- a) producing on the surface of an electrographic element a liquid toned image,
- b) contacting said image on said surface with a temporary receptor element comprising in sequence a carrier layer, a release layer and a thermoplastic film-forming binder, said binder having a dry thickness in the range of 3 to 100 micrometers,
- c) applying between said electrographic element and said binder on said receptor element a pressure of between 0.1 kg/cm.sup.2 and 50 kg/cm.sup.2 at a temperature in the range of 30.degree. C. to 200.degree. C.,
- d) releasing the pressure, and
- e) separating said receptor element from said one surface of said electrographic element, said liquid toned image remaining adhered to said binder on said carrier element,
- f) contacting said liquid toner image and said binder to a permanent receptor layer under conditions of heat and/or pressure sufficient to adhere said binder to said permanent receptor with a bond strength that exceeds the binders adherent strength to said carrier layer, and
- g) removing said carrier layer so that said toner image, binder layer and release layer are adhered to said permanent receptor, with said release layer being furthest away from said permanent receptor.
Dependencies are inferred from the claim text.