Method for spectrally sensitizing silver halide photographic emu

Details Method for spectrally sensitizing silver halide photographic emu Method for spectrally sensitizing silver halide photographic emu

1992-02-26

1993-03-09

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430570, 430572, 430573, 430611, G03C 1015, G03C 112

Patent

active

051926539

ABSTRACT:
A method for spectrally sensitizing silver halide emulsions is disclosed, comprising the step of adding a cyanine dye, which provides a J-band when added to silver halide emulsions, to a silver halide emulsion followed by ripening with such conditions that the relative quantum yield .phi..sub.r of spectral sensitization assumes a value of 1/2 or less of the .phi..sub.r of spectral sensitization obtained when the dye is added to the emulsion under ripening conditions of 40.degree. C. and 20 minutes from the time of addition of the dye to the emulsion until the time of coating the emulsion, and then ripening the silver halide emulsions. In one embodiment of the disclosed method, a heterocyclic compound which contains a mercapto group is added to the emulsion before the addition of the dye in an amount sufficient to increase the .phi..sub.r.

REFERENCES:
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patent: 4693965 (1987-09-01), Ihama et al.
patent: 4879208 (1989-11-01), Urabe
patent: 4894323 (1990-01-01), Kawai et al.
Mess, The Theory of the Photographic Process, 3rd Ed. 1966, Macmillan Co. pp. 250-251.

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