Freeze indicators, components therefor and preparative processes
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United States of America Patent
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Mar 6, 2012
Grant Date -
Jul 1, 2010
app pub date -
Jul 28, 2009
filing date -
Jul 30, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Freeze indicators can include an indicator dispersion, a liquid medium, indicator particles dispersed in the liquid medium and a particulate inorganic nucleating agent to inhibit supercooling of the liquid medium. The inorganic nucleating agent can have an ionic surface coating which can help provide a sharp end point. Optionally, freeze indicators can include indicator particles comprising an organic material and a softener to soften the indicator particles and provide the freeze indication with an enhanced visual appearance. Another option is to provide a temperature-sensitive stabilizer to inhibit coagulation of the indicator dispersion at temperatures above the liquid medium frozen state melting point while permitting coagulation of the indicator dispersion at the liquid medium frozen state melting point.
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