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US 6,306,929 B1Granted
Bleeding ink for printing security documents
AssigneeSicpa Holding SA
InventorsPhilippe Amon, Anton Bleikolm, Olivier Rozumek, Pandelis Papadimitriou
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AssigneeSicpa Holding SA
InventorsPhilippe Amon, Anton Bleikolm, Olivier Rozumek, Pandelis Papadimitriou
Estimating the term…
A bleeding or fugitive printing ink is disclosed and claimed which can be printed by the method of dry or wet offset or letterpress. This ink allows, when printed on security documents and dried, to prevent attempts of forgery or counterfeit in that the ink contains at least one dyestuff which is sensitive to organic solvents and other chemical reagents. The ink, when printed, forms a solid, polymerized or cross-linked binder matrix on the surface of the document when the printings are submitted to energy radiation, or by an oxypolymerization reaction. This matrix is formed near immediately, in the case of oxypolymerization within 24 hours, in contrast to conventional bleeding printing inks whose matrixes do not really dry and remain liquid in the interstices of the substrate.
A method for authenticating a security document, said method comprising steps of:
A method for authenticating a security document, said method comprising steps of:
A security substrate having a dried and cured printed ink layer comprising at least one dye soluble in at least one organic solvent, said dye making of from 5% to 20% by weight of the printing ink, and at least one crosslinking printing ink binder said ink layer being dried and cured under the influence of energy radiation thus forming a crosslinked binder matrix, said security document being authenticable by subjecting the dried and crosslinked ink layer to an organic solvent.
A security substrate having a dried and cured printed ink layer comprising at least one dye soluble in at least one organic solvent, said dye making of from 5% to 20% by weight of the printing ink, and at least one crosslinking printing ink binder said ink layer being dried and cured by oxypolymerization thus forming a crosslinked binder matrix, said security document being authenticable by subjecting the dried and crosslinked ink layer to an organic solvent.
Dependencies are inferred from the claim text.