Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-06-04
1981-11-17
Lovering, Richard D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
73356, 128736, 2522997, 252316, 428307, C08L 6124, B01J 1302, C09K 334
Patent
active
043010547
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.
REFERENCES:
patent: 3409404 (1968-11-01), Fergason
patent: 3578844 (1971-05-01), Churchill et al.
patent: 3585381 (1971-06-01), Hodson et al.
patent: 3661142 (1972-05-01), Flam
Gautherie et al., "Thermographie Chloesterique", Pathologie Bilogie, Sep. 1974, pp. 554-564.
Acta Thermographica, Supplement 2, European Thermographic Association, (1978).
Buirley William L.
Koopman Donald E.
McQuain David B.
Reeves William H.
Lovering Richard D.
Thermal Imagery, Inc.
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