Succinic acid derivative degradable chelants, uses and compositions thereof
AssigneeEastman Kodak Company
InventorsDavid A. Wilson, Druce K. Crump, Eric R. Brown
Life of this patent
Estimating the term…
Abstract
Aminosuccinic acid chelants are disclosed which have been found to be applicable in photographic processes. The aminosuccinic acids can be used in a method of bleaching or bleach-fixing a silver halide photographic material comprising contacting the photographic material with a bleaching solution containing at least one metal complex of a polyamino disuccinic acid and one or more metal complexes of a polyamino monosuccinic acid or a monoamino monosuccinic acid.
Claims54
A method of bleaching or bleach-fixing a developed silver halide photographic material comprising contacting said photographic material with a bleaching solution containing a bleaching agent comprising at least one metal complex of a polyamino disuccinic acid and one or more metal complexes of a polyamino monosuccinic acid, wherein the polyamino substituent of the at least one metal complex of a polyamino disuccinic acid and the polyamino substituent of the at least one metal complex of a polyamino monosuccinic acid are the same, and wherein the molar ratio of said polyamino disuccinic acid to said polyamino monosuccinic acid is from 10:1 to 1:1.
An aqueous photographic bleaching solution comprising a water-soluble halide and as the bleaching agent, a metal complex of a polyamino disuccinic acid, and a metal complex of a polyamino monosuccinic acid, wherein the polyamino substituent of the polyamino disuccinic acid and the polyamino substituent of the polyamino monosuccinic acid are the same, and wherein the molar ratio of said polyamino disuccinic acid to said polyamino monosuccinic acid is from 10:1 to 1:1.
An aqueous photographic bleach-fixing solution comprising a silver halide solvent, and as the bleaching agent, a metal complex of a polyamino disuccinic acid, and a metal complex of a polyamino monosuccinic acid, wherein the polyamino substituent of the polyamino disuccinic acid and the polyamino substituent of the polyamino monosuccinic acid are the same, and wherein the molar ratio of said polyamino disuccinic acid to said polyamino monosuccinic acid is from 10:1 to 1:1.
Dependencies are inferred from the claim text.