Photographic elements comprising 2-phenylcarbamoyl-1-naphthol image-modifying couplers yielding dyes resistant to crystallization and reduction
AssigneeEastman Kodak Company
InventorsPaul B. Merkel, Jerrold N. Poslusny, Melvin M. Kestner, Ronald E. Leone, David A. Steele
Life of this patent
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Abstract
Photographic elements comprising certain 2-phenylcarbamoyl-1-naphthol image-modifying couplers exhibit proper hue, a resistance to dye crystallization, and a resistance to leuco cyan dye formation. Such couplers can be utilized for their image-modifying effect and can contribute substantially to the overall dye density of an image.
Claims19
A photographic element comprising a support bearing (a) at least one silver halide emulsion and (b) at least one cyan dye-forming 2-phenylcarbamoyl-1-naphthol image-modifying coupler having the structure:
- ##STR18## wherein:
- R.sub.1 is selected from an alkoxy group, a phenoxy group and halogen;
- R.sub.2 is selected from the group consisting of an unsubstituted or substituted alkyl group, an unsubstituted or substituted phenyl group, an unbranched unsubstituted alkoxy group, a halogen, and an alkoxycarbonyl group;
- with the proviso that when R.sub.2 is an alkoxycarbonyl group or halogen, R.sub.1 is an alkoxy or a phenoxy group;
- R.sub.3 is selected from hydrogen, and an alkyl group;
- R.sub.1, R.sub.2, and R.sub.3 together contain at least 3 carbon atoms;
- and
- Z is a development inhibitor releasing group having the structure ##STR19## wherein:
- IN is a development inhibitor moiety;
- TIME is a timing group or switch capable of releasing the development inhibitor moiety by means of intramolecular nucleophilic displacement reaction or electron transfer reaction down a conjugated chain;
- and
- w is 1, 2, or 3.
A photographic element comprising a support bearing (a) at least one silver halide emulsion and (b) at least one cyan dye-forming 2-phenylcarbamoyl-1-naphthol image-modifying coupler having the structure:
- ##STR28## wherein:
- R.sub.1 is selected from an alkoxy group, a phenoxy group and halogen;
- R.sub.2 is selected from the group consisting of an alkyl group, a phenyl group, an alkoxy group, and a halogen;
- with the proviso that when R.sub.2 is a halogen, R.sub.1 is an alkoxy or phenoxy group;
- R.sub.3 is selected from hydrogen, and an alkyl group;
- R.sub.1, R.sub.2, and R.sub.3 together contain at least 3 carbon atoms;
- and
- Z is a development inhibitor releasing group having the structure ##STR29## wherein:
- IN is a development inhibitor moiety;
- TIME is a timing group or switch capable of releasing the development inhibitor moiety by means of intramolecular nucleophilic displacement reaction or electron transfer reaction down a conjugated chain;
- and
- w is 1, 2, or 3.
Dependencies are inferred from the claim text.