Thermochromic polymers for rapid visual assessment of temperature
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United States of America Patent
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Mar 16, 2004
Grant Date -
Oct 17, 2002
app pub date -
Jan 10, 2001
filing date -
Jan 11, 2000
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Abstract
A thermochromic polymer-based temperature indicator composition which comprises a polythiophene and a carrier medium. The composition is characterized in that the polythiophene is present in the medium in an amount of about 0.05 to about 5.0% by weight based on the total weight of the composition. The structure of the compound is designed such that when the composition is placed in a heat-exchange relationship with an article, the composition will exhibit a color change when a design temperature or a temperature beyond the design temperature is reached in the article.
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