C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
6/23
C09D 11/00 (2006.01)
Patent
CA 2025627
An initially colorless, chemically sensitive protective ink which can be readily printed or applied onto a document substrate and which reacts upon contact with an oxidizing agent to form a noticeable color change is provided. The protective ink, when printed onto a document, resists leaching by water for an extended period of time, both before and water contact with oxidizing agents, and provides visible evidence of any attempted tampering. The leach-resistant ink includes a colorless material which becomes colored upon contact with an oxidizing agent and a complexing agent which reacts to form a complex with the colorless material. A fixing agent which promotes insolubilization and fixing of the complex to the document substrate is also provided.
ncre de sécurité sensible à des agents chimique d'abord incolores, facilement appliquée par impression ou autrement sur le substrat d'un document et qui réagit au contact d'agents oxydants de façon à produire un changement notable de couleur. Appliquée sur un document, cette encre de sécurité résiste longtemps à l'extraction par l'eau, avant et après le contact avec des agents oxydants, et indique de façon visible toute tentative d'altération. Cette encre résistant à l'extraction comporte un produit incolore qui se colore au contact d'un agent oxydant et d'un agent complexant qui réagit de façon à former un complexe avec le produit incolore. Ce produit comporte aussi un fixateur qui améliore les caractéristiques d'insolubilisation et de fixation du complexe au substrat du document.
Gowling Lafleur Henderson Llp
The Standard Register Company
LandOfFree
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