Photochromic polycondensates

Details Photochromic polycondensates Photochromic polycondensates

1975-07-21

1977-05-31

Hoke, V. P.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08G 6318

Patent

active

040268691

ABSTRACT:
Linear photochrome polycondensates of the polyester type are described which contain spiropyran photochromic groups as an integral part of the main polymer chain, have a glass transition temperature lower than 120.degree. C and possess photochromic properties at or above their glass transition temperature.
Manufacture of stabilized photochromic images by exposing a layer of the photochromic polycondensate at a temperature at least equal to the glass transition temperature of the photochromic polycondensate and immediately cooling the thus exposed layer below the glass transition temperature.

REFERENCES:
patent: 3652285 (1972-03-01), Delzenne et al.
patent: 3696098 (1972-10-01), Hoefnagels et al.
"Photochromic Behavior of Polymer Systems and Related Phenomena", by G. Smets, Pure and Applied Chemistry, vol. 30, Nos. 1-2 (1972) pp. 1-24.

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