Thermochromic composition
First Claim
Patent Images
1. A liquid temperature indicating composition comprising:
- (a) a binder;
(b) folic acid; and
(c) an effective amount of an activator for irreversibly changing the color of the composition at a temperature less than 230°
C., the color change being substantially complete over a 10°
C. temperature range, the activator comprising an acid that has a pK of less than 4.2 and that is solid in the binder at room temperature, both before and after the composition dries.
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Abstract
A temperature indicating composition is provided for use on recoverable articles so that heating to produce recovery or to activate a heat-activatable sealant can be monitored. The composition comprises a thermochromic colorant in a binder and an activator that causes the thermochromic colorant to change color at a temperature lower than the temperature at which the colorant would change temperature in the absence of the activator. The thermochromic colorant can be folic acid and the activator can be an acid that has a pK of less than 4.2.
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Citations
14 Claims
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1. A liquid temperature indicating composition comprising:
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(a) a binder; (b) folic acid; and (c) an effective amount of an activator for irreversibly changing the color of the composition at a temperature less than 230°
C., the color change being substantially complete over a 10°
C. temperature range, the activator comprising an acid that has a pK of less than 4.2 and that is solid in the binder at room temperature, both before and after the composition dries. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid temperature indicating composition comprising:
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(a) a binder; (b) folic acid; and (c) an effective amount of an activator for irreversibly changing the color of the composition at a temperature less than 230°
C., the color change being substantially complete over a 10°
C. temperature range, the activator comprising an acid precursor that when exposed to UV light or heat forms an acid that has a pK of less than 4.2. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification