Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Patent
1983-07-27
1985-02-26
Gron, Teddy S.
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
116216, 128736, 2522997, 2524081, 252962, 428 1, C09K 334, G01N 3100, G01N 3300, C08L 6124, B01J 1302
Patent
active
045015031
ABSTRACT:
Thermographic cholesteric coating compositions, containing cholesteric microcapsules, and coated plates are provided which give gray-red-green-blue coated temperature-responsive visual displays, over about a 3.degree. or 4.degree. C. range. Formulations are devised to give the displayed range, in about 1.degree. C. intervals from about 28.degree. C. to about 37.degree. C. The microcapsules contain about 55% oleyl cholesteryl carbonate, about 2.0 to about 5.0% cholesteryl propionate and about 4.5 to about 7.2% of cholesteryl chloride. Coatings containing two different microencapsulated formulations, both selected within the above formulation range give thermographic plates showing a temperature-responsive visual display of seven distinct color shades, over about a 4.degree.-7.degree. C. range, without loss of sensitivity and without loss of noticeable color intensity.
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Buirley William L.
Koopman Donald E.
McQuain David B.
Reeves William H.
Gron Teddy S.
Kilby Catherine S.
Vectra International Corporation
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