Coating composition, system including the coating composition, and method for secure images

摘要

A coating composition, system, and method for printing documents that are difficult to chemically or physically forge and that are easy to visually verify are disclosed. The system includes a substrate, a toner, including a colorant and a dye, a primary migration-enhancing coating applied using an offset printing process and optionally a secondary migration-enhancing coating applied using an offset printing process. An image formed using the toner of the invention is readily verified by comparing a colorant-formed image and a 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.

主权项

1. A system for producing a secure document using toner-based imaging, the system comprising:
a substrate having a first surface and a second surface; a toner comprising a colorant and a dye, the toner applied to the first surface of the substrate, the colorant and dye forming an image on the first surface; a first migration coating applied beneath the toner on the first or to the second surface of the substrate by offset printing to be substantially in register with the colorant and dye formed image; whereby the first migration coating facilitates migration of the toner formed image from the first surface of the substrate into the substrate, forming an image visible from the second surface of the substrate.