Compositions – Light transmission modifying compositions – Modification caused by energy other than light
Patent
1991-08-20
1994-03-15
Tucker, Philip
Compositions
Light transmission modifying compositions
Modification caused by energy other than light
549 41, 549 51, 549 52, 549265, G02F 100, C07D33350, C07D33362, C07D30514
Patent
active
052943755
ABSTRACT:
Disclosed is a class of bridged phthalides and sulfinate esters which exhibit reversible thermochromism. At room temperature and in the presence of base, these compounds are substantially colorless but upon the application of heat they become colored, reverting to their original colorless or weakly colored state upon cooling. This colorless to colored, temperature-dependent cycle can be repeated many times. These compounds have utility as temperature sensors and as thermal pH indicators.
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Kampe Marcis M.
Waller David P.
Whritenour David C.
Loeschorn Carol A.
Polaroid Corporation
Tucker Philip
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