TTI indicator with balanced photochemical processes
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United States of America Patent
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Mar 26, 2013
Grant Date -
Jun 3, 2010
app pub date -
Dec 17, 2007
filing date -
Jan 11, 2007
priority date (Note) -
Expired
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Abstract
The invention relates to a time temperature indicator comprising a) at least one photo-chromic colorant introduced into and/or atop a matrix substrate and charged by exposure to UV light; b) at least a transparent colorless or a transparent colored light absorbing protecting layer adhered to the underlying layer a) which contains the photo-chromic colorant; characterized in that the light absorbing protecting layer comprises 1-50 wt % of an UV light absorber or an UV light absorber mixture and 0.1-10 wt % of an optical brightener wherein the weight ratio of the UV light absorber and optical brightener is 0.1-10.
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