Temperature indicating compositions
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United States of America Patent
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Aug 23, 1994
Grant Date -
N/A
app pub date -
Apr 16, 1993
filing date -
Apr 16, 1993
priority date (Note) -
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Abstract
Temperature indicating compositions of dispersions in an aqueous binder of a color changing electron donating compound having a melting point greater than about 300.degree. F. and a polymeric electron accepting resin reactive with the electron donating compound to produce a visible and permanent color change and having a T.sub.g and non-volatility effective to provide a color change to coatings containing the composition upon exposure to a predetermined heat history. Temperature indicating materials are also disclosed containing a support coated on at least one surface thereof with the temperature indicating composition to the present invention.
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