Method to extract silver from a photographic developer
AssigneeEastman Kodak Company
InventorsOlivier J. Poncelet, Jacques Roussilhe, Danielle M. Wettling
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Abstract
This invention concerns the developing of silver halide photographic products. Silver-laden slurries accumulate in developing baths. It is possible to eliminate these silver-laden slurries by placing the developing baths in contact with aluminosilicate polymers modified by sulfur groups. For example, a tank 12 is fitted with a loop to feed the bath through a cartridge 16 that contains the elements 18 that are permeable to the developing bath, and which contain the aluminosilicate polymer modified by the sulfur groups.
Claims10
Method to extract the metallic silver present in an aqueous photographic silver halide developer as a result of silver halide development, comprising the step of placing said developer in contact with an aluminosilicate polymer bearing on its surface organic radicals with functions selected in the group consisting of SH and —S(CH2)nS— functions, where n is an integer from 1 to 4.
Product comprising (i) an aluminosilicate polymer, said polymer bearing on its surface organic radicals with functions selected in the class consisting of SH and —S(CH2)nS— functions where n is an integer from 11 to 14, and (ii) a silver complexing agent that is released into an aqueous developer for silver halide photographic products.
Dependencies are inferred from the claim text.