Polydispersed silver halide emulsions with iodide for use in dif

Details Polydispersed silver halide emulsions with iodide for use in dif Polydispersed silver halide emulsions with iodide for use in dif

1972-11-03

1976-06-01

Klein, David

Gas separation: apparatus

Magnetic separating means

And electric field separation apparatus

96 29D, 96 77, 96 94R, G03C 700, G03C 554, G03C 148, G03C 110

Patent

active

039605574

ABSTRACT:
The present invention relates to photography and, more particularly, to diffusion transfer process photographic film units which comprise a photosensitive element adapted to provide, by diffusion transfer photographic processing, selective dye image recordation of incident actinic radiation as a function of the point-to-point degree of photosensitive element exposure, which film unit includes a plurality of essential layers including a polydisperse silver halide photosensitive emulsion layer comprising a particulate dispersion of photosensitive silver iodobromide, iodochloride or iodochlorobromide crystals possessing a mean iodide concentration within the range of about 0.5 to 15 mole % and in which not in excess of about 20%, by weight, of the crystals deviate from the selected mean iodide concentration by in excess of about .+-.25%, by weight, of iodide, having associated therewith dye image-forming material which is diffusible during processing as a function of the point-to-point degree of silver halide layer exposure to incident actinic radiation and a layer adapted to receive dye image-forming material diffusing thereto; and to specified diffusion transfer processes employing such film units.

REFERENCES:
patent: 3326641 (1967-06-01), Audran et al.
patent: 3415650 (1968-12-01), Frame et al.
patent: 3498454 (1970-03-01), Timson
patent: 3697271 (1972-10-01), Timson

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