Compositions – Nonreactive analytical – testing – or indicating compositions
Patent
1982-05-03
1988-04-05
Lovering, Richard D.
Compositions
Nonreactive analytical, testing, or indicating compositions
428913, 252962, 116207, 116216, 374161, 374162, 374141, G01N 3100, G01D 2100
Patent
active
047357452
ABSTRACT:
A new process is described which is useful for producing novel articles of manufacture useful for monitoring the time-temperature history of perishable items. The process initially involves forming a solution comprised of a diacetylenic monomer and a solvent. The solution is frozen, and the frozen solution having crystalline diacetylenic monomer therein is irradiated to partially polymerize the diacetylenic monomer. Partial polymerization of the crystalline diacetylenic monomer admixed with frozen solvent results in the production of a novel article of manufacture having color. The novel article of manufacture is comprised of frozen solvent, diacetylenic monomer, and colored polydiacetylene. Due to the intensity of the color of the polydiacetylene, the entire article of manufacture appears to be colored.
The colored article of manufacture may be attached to various perishables to monitor the shelf life of the perishables. Upon exposure to temperatures above a critical temperature, the frozen solvent melts and extracts unreacted monomer from the colored polymer, thereby causing a sharp color transition which indicates that the perishable should possibly be discarded.
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Baughman Ray H.
Preziosi Anthony F.
Prusik Thaddeus
Kilby Catherine S.
LifeLines technology, Inc.
Lovering Richard D.
Plantamura Arthur J.
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