Thermochromic polyacetylenes containing urethane groups
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United States of America Patent
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Jul 29, 1980
Grant Date -
N/A
app pub date -
Oct 5, 1977
filing date -
Oct 5, 1977
priority date (Note) -
Expired
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Abstract
Certain polyacetylenes exhibit reversible color changes at transition temperatures in the range -180.degree. to 220.degree. C., wherein the thermochromic cycles can be repeated many times with no apparent degradation and little change in spectroscopic properties. These thermochromic polyacetylenes are useful in temperature-indicator and indicia-display device applications. A process for laser-beam recording of images is described employing a thermochromic polyacetylene, in which the hysteresis properties of the polyacetylene can be suitably altered allowing for selectively storing or erasing the formed image.
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