Silver halide complexing agents of sulfones, nitriles, and onium salts
AssigneeEastman Kodak Company
InventorsArthur H. Herz, Daniel S. Daniel
Life of this patent
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Abstract
Certain organic, carbon acid silver halide complexing agents in a photographic diffusion transfer system provide suitable replacement for conventional silver halide complexing agents. Such organic, silver halide complexing agents include certain sulfones, nitriles and onium salts. These are especially useful in a silver salt diffusion transfer system. They can be employed with silver halide developing agents, such as in a monobath, and are especially suitable with a hydroxylamine silver halide developing agent. Other addenda commonly employed in photographic diffusion transfer systems can be employed in combination with these silver halide complexing agents.
Claims8
In a photographic silver salt, chemical transfer product comprising (a) a photographic element comprising photographic silver halide, (b) a processing composition, and (c) an image receiving layer comprising development nuclei, said product comprising an organic silver halide complexing agent, the improvement wherein said silver halide complexing agent is a carbon acid of the formula:
- ##STR22## wherein CH is a carbon acid moiety with a pKa greater than about 8 and less than about 16,
- m is 0 or an integer of 1 through 4,
- Z taken with A and Y represents atoms completing a 4 to 7-member heterocyclic nucleus, and
- (1) when m is 1 through 4,
- A and Y each independently represents ##STR23## where R is alkyl containing 1-7 carbon atoms, with the proviso that A and Y are not both --SO.sub.2 --,
- L is H, alkyl containing 1 to 7 carbon atoms or aryl containing 4-12 carbon atoms, X.sup.- is an anion;
- (2) when m is zero as in the formula:
- ##STR24## A and Y are independently:
- ______________________________________ A Y ______________________________________ RSO.sub.2 NO.sub.2 NC CN F.sub.3 C CF.sub.3 X.sup.- (R).sub.3 P.sup.+or N(R).sub.3 X.sup.- or X.sup.- (R).sub.2 S.sup.+or S.sup.+ (R).sub.2 X.sup.- or X.sup.- (R).sub.3 Nor P.sup.+ (R).sub.3 X.sup.- or ##STR25## ##STR26## ______________________________________
- where R.sup.1 is R, OR, NH.sub.2 or NR.sub.2, R is alkyl containing 1 through 7 carbon atoms with the proviso that Y is not --CN when A is RSO.sub.2 -- and wherein L is as defined above.
Dependencies are inferred from the claim text.