Heterocyclic phosphorus compound stabilizers
AssigneeEastman Kodak Company
InventorsJohn D. Goddard, Llewellyn J. Leyshon
Life of this patent
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Abstract
A photographic element comprising a silver halide emulsion layer having associated therewith a compound having the formula ##STR1## wherein Y is --O--, --S--, --NH-- or --NR.sup.1 --; n is 0 or 1; each R.sup.1 independently is the residue of a phosphorus acid; each Z independently represents the atoms necessary to complete a substituted or unsubstituted benzene ring; and, X is a single bond or a linking group having a single atom which separates the two benzene rings. Use of the compound provides increased stability of the dye image obtained during photographic processing.
Claims8
A photographic element comprising a support having thereon at least one silver halide emulsion layer having associated therewith a dye stabilizer comprising a compound having the formula ##STR12## wherein Y is --O--, --S--, --NH-- or --NR.sup.1 --;
- n is 0 or 1;
- each R.sup.1 independently is the residue of a phosphorus acid;
- each Z independently represents the atoms necessary to complete a substituted or unsubstituted benzene ring;
- and,
- X is a single bond or a linking group having a single atom which separates the two benzene rings.
Dependencies are inferred from the claim text.