Light absorbing layer for photo-chromic systems
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United States of America Patent
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Aug 30, 2011
Grant Date -
Jul 10, 2008
app pub date -
Oct 24, 2007
filing date -
Oct 26, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composition which comprises a light absorbing layer adhered to an underlying layer containing a photo-chromic colorant, which photo-chromic colorant has been activated by exposure to UV light to undergo a reversible color change, and wherein the rate of color reversion is dependent on temperature, is provided. The ultraviolet light and/or visible light absorbing layer may also contain components which reflect rather than absorb light and can be conveniently applied via thermal transfer or ink jet to a substrate comprising the photo-chromic colorant to protect it from unwanted exposure to UV and/or certain wavelengths visible light. The composition is conveniently employed in a temperature time indicator (TTI).
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