Photographic compositions with silver halide solvents containing

Details Photographic compositions with silver halide solvents containing Photographic compositions with silver halide solvents containing

1978-08-04

1980-07-08

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Fixer

G03C 538

Patent

active

042115620

ABSTRACT:
Difunctional compounds wherein one of said functions is a hard or soft atom that ionizes to the corresponding anion in alkaline solution to combine with silver cation and the other of said functions is a non-ionizable soft base that additionally combines with said silver cation are employed as silver halide complexing agents in photography. In a preferred embodiment, the difunctional compounds possess (a) an O, N or C atom that ionizes to the corresponding O.sup..crclbar., N.sup..crclbar. or C.sup..crclbar. anion in basic solution and (b) an --S-- containing moiety excluding --SH and moieties that form --S.sup..crclbar. in basic solution wherein the --S-- of said moiety is positioned alpha, beta, gamma, delta, epsilon or zeta to said anion.

REFERENCES:
patent: 2857276 (1958-10-01), Land et al.
patent: 3443941 (1969-05-01), Rogers
patent: 3615511 (1971-10-01), Cole
patent: 3701783 (1972-10-01), Barretal
patent: 3779757 (1973-12-01), Hofman et al.
patent: 3958992 (1976-05-01), Greenwald
patent: 4046568 (1977-09-01), Greenwald
patent: 4047954 (1977-09-01), Greenwald
patent: 4047955 (1977-09-01), Greenwald

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