04228126 is referenced by 25 patents and cites 2 patents.

An improved recording device is described, useful for measuring the integrated time-temperature or integrated radiation-dosage history of an article, comprising a substrate onto which an acetylenic compound, containing at least two conjugated C.tbd.C groups, in an inactive form, is deposited. The inactive form is capable of being converted by melt or solvent recrystallization to an active form, which undergoes 1,4-addition polymerization resulting in an irreversible, progressive color change. The color change produced at any given point in time represents an integrated time-temperature history of thermal annealing or integrated radiation-dosage history of exposure to actinic radiation to which an article has been exposed.

Also described is a process for producing an inactive form of the acetylenic compound. A film and a fiber, made from the inactive form of an acetylenic compound are also described.

Title
Diacetylene time-temperature indicators
Application Number
5/854933
Publication Number
4228126
Application Date
November 25, 1977
Publication Date
October 14, 1980
Inventor
Kwok C Yee
Randolph
NJ, US
Gordhanbhai N Patel
Morris Plains
NJ, US
Agent
Robert A Harman
Assignee
Allied Chemical Corporation
NJ, US
IPC
G01N 21/06
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