Bleeding ink for printing security documents

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 11/02 (2006.01) B41M 3/14 (2006.01) C09D 11/00 (2006.01) C09D 11/10 (2006.01)

Patent

CA 2224928

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, polymerised or cross-linked binder matrix on the surface of the document when the printings are submitted to energy radiation, or by an oxypolymerisation reaction. This matrix is formed nearly immediately, in the case of oxypolymerisation 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.

Encre d'impression soluble ou fugitive qui peut être imprimée par le procédé offset à l'humide ou sec ou par la typographie. Lorsqu'elle est imprimée sur des documents de sécurité et séchée, cette encre permet d'empêcher les tentatives de falsification ou de contrefaçon dans la mesure où elle contient au moins un colorant sensible aux solvants organiques et à d'autres réactifs chimiques. Ladite encre, lorsqu'elle est imprimée, forme une matrice de liaison solide, polymérisée ou réticulée sur la surface du document lorsque l'impression est soumise à un rayonnement d'énergie ou à une réaction d'oxypolymérisation. Ladite matrice se forme presque immédiatement, dans les 24 heures en cas d'oxypolymérisation, en contraste avec les encres d'impression solubles traditionnelles dont les matrices ne sèchent pas vraiment et restent liquides dans les interstices du substrat.

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