Nonreversible freeze-thaw indicator

Details Nonreversible freeze-thaw indicator Nonreversible freeze-thaw indicator

1977-02-22

1979-04-10

Padgett, Benjamin R.

Compositions

Nonreactive analytical, testing, or indicating compositions

73356, 116216, C09K 300

Patent

active

041487486

ABSTRACT:
A nonreversible freeze-thaw indicator which will detect whether an article has been subjected to freezing or thawing conditions comprising an encapsulated translucent to opaque colloidal dispersion of organic solid particles suspended in a liquid medium, said colloidal dispersion having the property of becoming nonreversibly destablized upon freezing which thereafter provides a telltale visual sign if said dispersion rises through its freeze-thaw temperature. After the colloidal dispersion has once been frozen to trigger its irreversible destabilization and is again thawed, it coagulates to form a non-flowing waxy gel, flocculates and precipitates leaving a clear liquid and a coagulated solids layer or partially flocculates to transform a translucent dispersion to a substantially opaque dispersion.

REFERENCES:
patent: 3122921 (1964-03-01), Koch
patent: 3414415 (1968-12-01), Broad
patent: 3521489 (1970-07-01), Finkelstein
patent: 3577352 (1971-05-01), Kelkheim
patent: 3980581 (1976-09-01), Godsey
patent: 3981683 (1976-09-01), Larson et al.
patent: 4022149 (1977-05-01), Berger
patent: 4028944 (1977-06-01), Erb
patent: 4051804 (1977-10-01), Garnett
patent: 4064828 (1977-12-01), Clark

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