Thermochromic compositions of color formers and lewis acids
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United States of America Patent
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Jun 21, 2005
Grant Date -
Jun 24, 2004
app pub date -
Oct 1, 2003
filing date -
Jan 31, 2001
priority date (Note) -
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Abstract
Thermochromic compositions that include combinations of at least one color former and at least one Lewis acid in a polymer mixture are disclosed. The thermochromic compositions reversibly change appearance from substantially transparent to substantially non-transparent above a lower critical solution temperature.
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