Process for the chemical sensitization of silver halide photogra

Details Process for the chemical sensitization of silver halide photogra Process for the chemical sensitization of silver halide photogra

1991-01-15

1992-12-08

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430603, 430605, 430614, 430612, G03C 108

Patent

active

051697513

ABSTRACT:
The invention relates to a novel process for the chemical sensitization of silver halide photographic emulsions.
The process according to the invention comprises adding as additional sensitizing agents a 40-260 .mu. moles/mole of a cyclic polyether containing 1 nitrogen and 5 oxygen atoms, or 2 nitrogen and 4 oxygen atoms, or 3 nitrogen and 3 oxygen atoms, or 4 nitrogen and 2 oxygen atoms as well as 12 carbon atoms and/or their complexes formed with gold and/or palladium and optionally 40-260 .mu. moles/mole of silver halide) of gold (I) or gold (III) sulfide to the sulfur-sensitized emulsion, and employing the cyclic polyether in relation to the noble metal salt in a molar ratio of 0.5:1-5:1 for the complex formation.

REFERENCES:
patent: 3893885 (1975-07-01), Charkoudian
patent: 4255512 (1981-03-01), Nawn et al.
patent: 4752560 (1988-06-01), Benard et al.
patent: 4865965 (1989-09-01), Friour et al.

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