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US 2008/0167183 A1Published application
Light absorbing layer for photo-chromic systems
AssigneeBASF SE
InventorsKathleen Hoekstra, David Nichols, Ross Birney
Life of this patent
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AssigneeBASF SE
InventorsKathleen Hoekstra, David Nichols, Ross Birney
Estimating the term…
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).
A composition comprising a light absorbing layer which is adhered to an underlying substrate, which underlying substrate comprises a photo-chromic colorant,
A single multi-step process which occurs either on a single machine or on multiple machines which are directly connected, which process comprises
A coated thermal transfer ribbon coated with a composition comprising
An ink jet printable liquid comprising
Dependencies are inferred from the claim text.