Thermochromic polyacetylenes containing urethane groups

摘要

Certain polyacetylenes exhibit reversible color changes at transition temperatures in the range -180 DEG to 220 DEG 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.