Heat resistant security document

B - Operations – Transporting – 41 – M

Patent

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B41M 3/14 (2006.01)

Patent

CA 2278145

A security document is provided containing a color-forming composition having an insulating material therein which allows the document to be passed through heated printing devices such as laser printers without the problem of premature color development. The color-forming composition includes a mixture of a color former, a color developer, and an insulating material. In a preferred embodiment, a toner adhesion-enhancing composition containing an insulating material is applied over the color-forming composition. The security document may be used to provide an authentication feature and/or an indication of attempted alterations from the use of solvents, heat or abrasion.

L'invention porte sur un document de sécurité contenant une composition chromogène et comportant une substance isolante, ce mélange permettant de passer ce document dans des dispositifs d'impression thermique tels que des imprimantes laser sans que se pose le problème d'un développement prématuré des couleurs. La composition chromogène comprend un mélange d'une substance chromogène, d'un agent de développement et d'une substance isolante. Selon une réalisation préférée, une composition renforçant l'adhésion du toner et contenant une substance isolante est appliquée sur la composition chromogène. Le document de sécurité peut être utilisé pour produire une caractéristique d'authentification et/ou une indication de tentative d'altération au moyen de solvants, d'une source de chaleur ou par abrasion.

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