Process for the production of documents which cannot be falsified
AssigneeAgfa-Gevaert
InventorsKarl-Friedrich Neuhaus, Hans J. Rosenkranz, Hermann Perrey
Life of this patent
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Abstract
The process relates to the production of tamperproof documents by laminating an information carrier on one or both sides with foils which have an adhesive layer which is hardened by radical cross-linking.
Claims24
A tamper proof document which is proof against falsification, consisting of an information carrier comprised of a sheet having a photographic emulsion layer carrying information and laminated with at least one transparent foil on one or both sides, wherein the foil carries an adhesive layer containing a polymer hardened by radical cross-linking by high energy radiation or by initiators capable of being activated by UV light or by heat, or by accelerators
- said adhesive layer bonding the foil to the surface of the information carrier photographic sheet in such a manner that the foil and sheet cannot be separated without destruction of the information carrier sheet and of the information contained in it.
A process for the production of a tamper proof information carrier by laminating a sheet and a plastic foil on one or both sides of said sheet, at least one foil being transparent,
- wherein said sheet has a photographic emulsion layer combined with information and said sheet is provided with at least one of said foils,
- and the foil is provided with an adhesive layer of a composition containing a substance making the adhesive layer hardenable by
- (1) radical cross-linking with high energy radiation or
- (2) an initiator activated by UV light, heat or an accelerator,
- and the laminating of the foil on one or both sides of the information carrier is performed in such a manner that the hardenable composition comes into contact with the information carrier and the laminate is hardened,
- whereby the adhesion between the foil and the carrier cannot be separated without destroying information on the carrier.
A process for the production of a tamper proof information carrier comprised of a sheet having a plastic foil laminated on one or both sides of said sheet, at least one foil being transparent,
- wherein said sheet has a photographic emulsion layer combined with the information and said sheet is provided with at least one of said foils,
- and said foil having an adhesive layer of hardenable composition containing an ethylenically unsaturated monomeric, oligomeric or polymeric compound, optionally a polymerization initiator and optionally an accelerator,
- wherein said composition includes a substance making the composition hardenable by
- (1) radical cross-linking with high energy radiation, or
- (2) an initiator activated by UV light, heat or an accelerator,
- and the laminating of the foil on one or both sides of the information carrier is performed in such a manner that the hardenable composition comes into contact with the information carrier and the laminate is hardened,
- whereby the adhesion between the foil and the carrier cannot be separated without destroying information on the carrier.
Dependencies are inferred from the claim text.