Chemistry: analytical and immunological testing – Process or composition for determination of physical state...
Patent
1985-10-09
1988-04-12
Richman, Barry S.
Chemistry: analytical and immunological testing
Process or composition for determination of physical state...
436 7, 436164, 436905, 422 56, 422 58, 116206, 116216, 2524081, G01N 3302, G01D 2100
Patent
active
047374632
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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Bhattacharjee Himangshu R.
Chance Ronald R.
Prusik Thaddeus
Yardley James T.
Johnston J.
LifeLines technology, Inc.
Plantamura Arthur J.
Richman Barry S.
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