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US 12,123,858 B2Granted
Time-temperature indicator based on increased thermal reactivity of a diacetylene upon melt recrystallization
AssigneeJP Laboratories, Inc.
InventorGordhanbhai Patel
Life of this patent
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Abstract
This application relates to a time-temperature indicator based on increased thermal reactivity of a diacetylene upon melt recrystallization and a method of making it. A diacetylene is crystallized into a low thermal reactivity phase from a solvent system and converted into a higher thermal reactivity phase and low sensitivity to UV light by melt re-crystallization.
Claims24
A precursor time-temperature indicating (TTI) device composed of a substrate having thereon:
- a color changeable diacetylenic layer composed of at least one binder, particles of at least one diacetylene and a UV absorber;
- a UV absorbing layer;
- and a release layer on the color changeable diacetylenic layer;
- wherein the diacetylene is inactive thermally and in UV prior to melt recrystallization and becomes thermally active with increased thermal reactivity to develop color with time and temperature upon melt recrystallization.
1 more element
Dependencies are inferred from the claim text.