Photoactivatable time-temperature indicator
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United States of America Patent
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Apr 12, 1988
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N/A
app pub date -
Oct 9, 1985
filing date -
Oct 9, 1985
priority date (Note) -
Expired
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Abstract
A photoactivated time-temperature indicator is based on diacetylenic salts. A thermally unreactive ('inactive') diacetylenic salt (or a mixture of such salts) is mixed, 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 thermal reactive ('active') free diacetylenic acid. 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 that require refrigeration.
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