Photoactivatable leuco base time-temperature indicator

Details Photoactivatable leuco base time-temperature indicator Photoactivatable leuco base time-temperature indicator

G - Physics

01

K

31/105

G01K 3/04 (2006.01) B63B 21/54 (2006.01)

Patent

CA 1286881

ABSTRACT OF THE DISCLOSURE PHOTOACTIVATABLE LEUCO BASE TIME-TEMPERATURE INDICATOR 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 sub- ambient temperature.

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