Photographic conditioning solution containing polyaminocarboxylic acid as sole antimicrobial agent and method of use
AssigneeEastman Kodak Company
InventorsHugh Gerald McGuckin, John Stuart Badger, Mary Ellen Craver
Life of this patent
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Abstract
A conditioning solution or bleach accelerating solution can be used to process color photographic films, especially color reversal films, to minimize magenta dye fade. This solution contains an antimicrobial composition that consists essentially of a polyaminocarboxylic acid or salt thereof as the sole antimicrobial agent. This agent is present in an amount of less than about 3 g/l.
Claims20
A conditioning solution having a pH of from about 4.5 to about 8, and comprising a bleach accelerating agent, a formaldehyde precursor, and an antimicrobial composition consisting essentially of a polyaminocarboxylic acid or salt thereof as the sole antimicrobial agent, said antimicrobial agent being present in said conditioning solution in an amount of from about 0.25 to about 3 g/l,
- said polyaminocarboxylic acid or salt thereof being represented by formula II:
- wherein
- R3, R4, R5 and R6 are independently an alkylene group of 1 to 8 carbon atoms,
- W is a covalent bond or methylene, ethylene or a cycloalkylene having 5 to 7 carbon atoms in the ring, provided that when W is cycloalkylene, the two nitrogen atoms are attached to the ring at adjacent carbon atoms, and
- M1, M2, M3 and M4 are independently hydrogen or a monovalent cation.
A conditioning solution having a pH of from about 4.5 to about 8, and comprising a bleach accelerating agent, a formaldehyde precursor, and an antimicrobial composition consisting essentially of a polyaminocarboxylic acid or salt thereof as the sole antimicrobial agent, said antimicrobial agent being present in said conditioning solution in an amount of less than about 3 g/l,
- wherein said sole antimicrobial agent is either ethylenediaminetetraacetic acid or 1,2-cyclohexanediaminetetraacetic acid.
A method for processing a color silver halide photographic element comprising:
- A) treating an imagewise exposed and developed color silver halide photographic element with a conditioning solution having a pH of from about 4.5 to about 8, and comprising a bleach accelerating agent, a formaldehyde precursor, and an antimicrobial composition consisting essentially of a polyaminocarboxylic acid or salt thereof as the sole antimicrobial agent, said antimicrobial agent being present in said conditioning solution in an amount of less than about 3 g/l,
- said polyaminocarboxylic acid or salt thereof being represented by formula II:
- wherein
- R3, R4, R5 and R6 are independently an alkylene group of 1 to 8 carbon atoms,
- W is a covalent bond or methylene, ethylene or a cycloalkylene having 5 to 7 carbon atoms in the ring, provided that when W is cycloalkylene, the two nitrogen atoms are attached to the ring at adjacent carbon atoms, and
- M1, M2, M3 and M4 are independently hydrogen or a monovalent cation, and
- B) bleaching said element treated in step A.
Dependencies are inferred from the claim text.