Photochromic paper with improved bistability

Details Photochromic paper with improved bistability Photochromic paper with improved bistability

2008-01-08

2008-01-08

Schilling, Richard L. (Department: 1795)

Radiation imagery chemistry: process, composition, or product th

Erasable imaging

C430S337000, C430S338000, C430S341000, C430S345000, C430S962000

Reexamination Certificate

active

07316875

ABSTRACT:
An image forming medium including at least a polymer and a photochromic compound such as spiropyran embedded in the polymer, wherein spiropyran molecules of the spiropyran compound are chelated by a cation.

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Wojtyk et al., “Effects of metal ion complexation on the spiropyran-merocyanine interconversion: development of a thermally stable photo-switch,” J. Chem. Soc. Chem, Comm., pp. 1703-1704, 1998.

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