Tamper evident documents and inks
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United States of America Patent
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Dec 29, 2015
Grant Date -
Mar 5, 2015
app pub date -
Aug 28, 2013
filing date -
Aug 28, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A tamper evident document, a process of preparing the tamper evident document, and a tamper evident ink. The tamper evident document includes a paper substrate having a face for providing information, and a tamper evident ink applied on the face of the paper substrate. The tamper evident ink includes (i) microcapsules having a cross-linked polymer shell and a core surrounded by the shell; and (ii) developer particles. The cores of the microcapsules include at least one color former dissolved in a carrier oil. If information on the tamper evident document is altered by force or pressure (e.g., by scraping with a knife), the microcapsules rupture and the color former reacts with the developer particles to provide a visual indication of tampering (e.g., appearance of color or color change) on the face of the document.
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