Laser marking of pigmented substrates
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United States of America Patent
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Issued Date -
May 29, 2008
app pub date -
Oct 30, 2007
filing date -
Nov 7, 2006
priority date (Note) -
Abandoned
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Abstract
A method for producing fluorescent markings on a substrate which method comprises exposing a composition comprising a polymer and an organic pigment to a heat source, such as laser radiation, to produce a fluorescent markings which are not discernable when viewed under ambient visible light but readily apparent under UV light is disclosed. The method produces novel compositions wherein a fluorescent form of a pigment is present at a higher concentration in defined domains relative to the remainder of the composition. The novel polymer composition is particularly useful in security marking applications.
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