Secure imaging toner and methods of forming and using the same

Details Secure imaging toner and methods of forming and using the same Secure imaging toner and methods of forming and using the same

G - Physics

03

G

G03G 9/08 (2006.01) G03C 1/52 (2006.01)

Patent

CA 2685314

A toner for printing documents that are difficult to chemically or physically forge and that are readily easy to visually verify and methods of using and forming the toner are disclosed. The toner includes a colorant for printing an image on a surface of a document, a fluorescent pigment that under normal lighting is masked by the colorant but creates a visible image on the first surface of the a substrate when irradiated by black or ultra-violet light, and a dye for forming a latent version of the image underneath a surface of a substrate. An image formed using the toner of the invention is readily verified by comparing the colorant-formed image and the dye-formed image. In addition, if a solvent is used in an attempt to alter the printed image on the substrate, the dye migrates or diffuses to indicate tampering with the document.

L'invention concerne un toner destiné à imprimer des documents qui sont difficiles à falsifier chimiquement ou physiquement et qui sont faciles à vérifier visuellement, ainsi que des procédés d'utilisation et de formation du toner. Le toner comprend un colorant pour imprimer une image sur une surface d'un document, un pigment fluorescent qui, sous un éclairage normal, est masqué par le colorant mais génère une image visible sur la première surface d'un substrat lorsqu'il est exposé à une lumière noire ou ultraviolette, et une matière colorante pour former une version latente de l'image sous une surface d'un substrat. Une image formée en utilisant le toner de l'invention est facilement vérifiée en comparant l'image formée par le colorant et l'image formée par la matière colorante. En outre, si un solvant est utilisé pour essayer de modifier l'image imprimée sur le substrat, la matière colorante migre ou se diffuse pour indiquer l'altération du document.

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