Highly absorptive dye-containing underlayer for laser recording

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making

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430364, 430517, 430616, 430964, 3461351, G03C 100, G03C 184, G02B 2722

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043967019

ABSTRACT:
An underlayer for a laser recording and data storage medium with a light absorption characteristic suited to a recording laser. The underlayer is formed by creating a nuclei layer in a silver-halide photosensitive emulsion layer and then contacting the emulsion layer with a chromogenic reducing agent and a chromogenic dye coupler. The reflective layer may be formed prior to this step by subjecting the nuclei layer to a monobath having a silver-halide solvent and a silver reducing agent until a reflective surface layer of non-filamentary silver particles is formed, or after the step by chemical vapor deposition or sputtering of a reflective metal layer over the underlayer.

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Clerc, Photographic Theory and Practice, vol. 3, American Photographic Book Publishing Co., New York, 1970, p. 325.
"Infrared Dyes for Optical Storage", V. B. Jipson and C. R. Jones, J. Vac. Techn. 18(1) Jan./Feb. 1981.

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