Photoactivatable leuco base time-temperature indicator
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United States of America Patent
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Apr 17, 1990
Issued Date -
N/A
app pub date -
Sep 30, 1987
filing date -
Dec 2, 1985
priority date (Note) -
Expired
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Abstract
A photoactivated time-temperature indicator is based on a leuco base system. A thermally insensitive, white ('inactive') leuco base (or a mixture of such leuco bases) is mixed, preferably in a polymeric matrix, with a material that generates acid upon exposure to light. Photoexcitation, preferably by UV or near UV light, causes the formation of a thermally sensitive, color-forming ('active') product. Following this activation step, a progressive color development occurs at a rate that increases with temperature. The indicator is useful for monitoring the freshness of perishable products, particularly those stored at subambient temperature.
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