Reversible redox-controlled imaging methods

Details Reversible redox-controlled imaging methods Reversible redox-controlled imaging methods

1991-05-31

1993-11-02

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

430203, 430222, 430224, 430338, 430351, 430542, G03C 172

Patent

active

052582795

ABSTRACT:
A novel class of N-substituted triarylmethane sulfonamides is provided which undergo reversible oxidation into colored form and reversible reduction of the oxidized form into colorless form. Preferred embodiments comprise xanthene sulfonamides having N-aryl substituents, e.g., hydroquinone substituents. These compounds possess redox potentials ranging between about +200 to -500 millivolts and thus are useful as dyes for producing photographic, photothermographic, thermal, and pressure-induced images, as well as being useful as redox indicators in a wide variety of biological and chemical reactions.

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Van de Sande, C. C., Angew. Chem. Int. Ed., Eng. 22 (1983), pp. 191-209.
Neblette, Imaging Processes and Materials, 8th Ed., Van Nostrand Reinhold, N.Y., 1989, Ch. 9, pp. 290-291.
Carpenter, J. W., and Lauf, P. W., "Photothermographic Silver Halide Systems", Research Disclosure, No. 17029, Jun. 1978.

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