Thermochromic polyacetylenes containing urethane groups

Details Thermochromic polyacetylenes containing urethane groups Thermochromic polyacetylenes containing urethane groups

1977-10-05

1980-07-29

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

20415919, 20415922, 252408, 116202, 116207, 116216, 430269, 430945, C08L 4900

Patent

active

042152089

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.

REFERENCES:
patent: 3501297 (1970-03-01), Cremeans
patent: 3723121 (1973-03-01), Hauser
patent: 3822134 (1974-07-01), Rasch et al.
patent: 3999946 (1976-12-01), Patel et al.
Wegner, Neitschrift fur Naturforschung 24B, 1969, pp. 824-832.
Wegner, Polymer Letters, 9, 1971, pp. 133-144.
Exarkos et al., USNTIS, AD Rep 783709, 1974.
Erarhos et al., J. Am. Chem. Soc., 98, 1976, pp. 481-487.

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