Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-03-03
1981-11-03
Serwin, Ronald
Chemistry: physical processes
Physical processes
Crystallization
116201, 116206, 116207, 422 56, G01N 2106
Patent
active
042983487
ABSTRACT:
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 2,4-hexadiyn-1,6-diol-bis-(p-chlorobenzenesulfonate) is deposited. The inactive form is capable of being converted by melt 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 converting an inactive form of 2,4-hexadiyn-1,6-diol-bis(p-chlorobenzenesulfonate) to its active form by thermal recrystallization.
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J. Mayerle et al., IBM Research Division, San Jose, CA 95193 (undated), The Crystal & Molecular Structure of 2,4-Heyadiyn-1,6 diol-bis.
Allied Corporation
Doernberg Alan M.
Serwin Ronald
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