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Diacetylene time-temperature indicators - Patent 4228126 (5465 words) |
 | Techniques are also described for deactivating the active phase of a diacetylene after use, by adding an inhibitor, changing the temperature, or by applying a mechanical stress in order to decrease the thermal reactivity and permanently record the integrated time-temperature history obtained. |
| Also provided is a process for preparing an inactive form of a diacetylenic compound, substantially free of any active forms, comprising dissolving said diacetylenic compound in a solvent therefor, and precipitating said compound from the solution at a sufficiently greater rate than the rate of precipitation of an active form of said compound. |
| The indicator containing the inactive form of the diacetylene may also contain a binder material such as an epoxy glue, lacquer or shellac to adhere the diacetylene crystals into a suitable medium to be placed onto the substrate. |
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