Silver halide material comprising low stain antenna dyes
AssigneeEastman Kodak Company
InventorsRichard L. Parton, Thomas L. Penner, David R. Foster, Stephen A. Hershey
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Abstract
This invention relates to a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith: (a) a first dye (Dye 1) that is a cyanine dye capable of spectrally sensitizing a silver halide emulsion and that has at least one anionic substituent; and (b) a second dye (Dye 2) that is not a cyanine dye and that has at least one cationic substituent. Dye 2 has a log P, excluding any counterion, of less than 4.00 and greater than 1.00 or Dye 2 is represented by a dye of formula II as described herein.
Claims15
A silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith:
- (a) a first dye (Dye 1) that is a cyanine dye capable of spectrally sensitizing a silver halide emulsion and that has at least one anionic substituent;
- and
- (b) a second dye (Dye 2) that has at least one cationic substituent and is represented by formula II
- wherein:
- R1 is a substituted alkyl group that comprises at least one tetraalkylammonium group and at least one additional heteroatom;
- E3 represents the atoms necessary to complete a substituted or unsubstituted 5- or 6-membered heterocyclic nucleus;
- Ar1 is a substituted or unsubstituted aryl group or a substituted or unsubstituted alkyl group;
- L11 through L14 are substituted or unsubstituted methine groups;
- s is 0 or 1;
- G11 is an electron-withdrawing group;
- G2 is O or dicyanovinyl (C(CN)2);
- and
- W1 is a counterion if necessary;
- and wherein the log P of Dye 2, excluding any counterion, is less than 4.00 and greater than 1.00.
A silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith:
- (a) at least one cyanine dye (Dye 1) that is capable of spectrally sensitizing a silver halide emulsion and that has at least one anionic substituent;
- (b) a second dye (Dye 2) of formula IIc containing at least one cationic substituent,
- wherein:
- Y1, Y2, and Y3 independently represent substituted or unsubstituted alkyl groups, and at least one of Y1, Y2, and Y3 comprises a heteroatom
- Ar3 and Ar4 independently represent substituted or unsubstituted aromatic groups;
- n represents an integer from 3 to 5;
- and
- W3 is a counterion.
Dependencies are inferred from the claim text.