Retouchable reversal silver halide photographic element with a pyrazoloazole magenta dye-forming coupler
AssigneeEastman Kodak Company
InventorsJ. R. Vargas, John W. Harder, Phillip D. Knight, Paul A. Burns, Lynda D. Weber
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Abstract
There are described reversal photographic elements containing magenta dye-forming couplers that yield dye images that particularly lend themselves to retouching. The photographic element comprises a pyrazoloazole magenta dye forming coupler having a cleavable ballast group joined to the remainder of the molecule by one or two electrophilic cleavage groups which can be removed with a specialized processing composition after reversal processing.
Claims7
A light sensitive reversal photographic element comprising a support bearing a silver halide emulsion associated with a pyrazoloazole magenta dye-forming coupler having the structure:
- Bal-P.sub.1 I.
- where:
- P.sub.1 is a pyrazoloazole dye forming coupler moiety, and
- Bal is an organic ballast group
- a) which is attached to the coupler at a position other than the coupling position,
- b) which immobilizes the coupler and the dye formed from the coupler on color development,
- c) which is not cleavable from the coupler by reversal color photographic processing, but
- d) which is cleavable from the dye by reaction with a dinucleophile to thereby render the dye mobile.
A light sensitive reversal photographic element comprising a support bearing a silver halide emulsion associated with a pyrazoloazole magenta dye-forming coupler having the structure:
- Bal-P.sub.1 I.
- where:
- P.sub.1 is a pyrazoloazole dye forming coupler moiety, and
- Bal is an organic ballast group
- a) which is attached to the coupler at a position other than the coupling position,
- b) which immobilizes the coupler and the dye formed from the coupler on color development,
- c) which is not cleavable from the coupler by reversal color photographic processing, but
- d) which is cleavable from the dye by reaction with a dinucleophile to thereby render the dye mobile;
- wherein Bal has a structure selected from:
- ##STR54## wherein:
- BAL' is an organic group that provides sufficient bulk with the remainder of the molecule to maintain the coupler in the layer in which it is coated;
- E.sub.1 and E.sub.2 are independently electrophilic groups;
- T.sub.1 and T.sub.2 are individually releasable timing groups;
- Y.sub.1 is an atom or group that provides a distance between E.sub.1 and E.sub.2 that permits a nucleophilic displacement reaction to occur;
- L is linking group comprising an alkyl, aryl, alkaryl or heterocyclyl group that links the coupler moiety to the remainder of the molecule;
- one of BAL', T.sub.1, T.sub.2, L or P.sub.1 contains a sulfur, nitrogen or oxygen atom through which it is bonded to E.sub.1 or E.sub.2 ;
- u, v, w, x and y are each 0 or 1;
- if u is 1, v is 1 and if u is 0, v is 0;
- and
- when u is 0, the group cleaved from E.sub.2 has a pK.sub.a of 12 or less, and when u is 1, the group cleaved from E.sub.1 or E.sub.2 has a pK.sub.a of 16 or less.
A light sensitive reversal photographic element comprising a support bearing a silver halide emulsion associated with a pyrazoloazole magenta dye-forming coupler having a carbonyl or dicarbonyl electrophile, the coupler having sufficient bulk to remain in the layer in which it is coated and having a structure selected from:
- ##STR55## wherein:
- y, n, q, x and w are 0 or 1;
- when n is 0, q is 0;
- P.sub.1 is a pyrazoloazole coupler moiety;
- R.sub.2 is hydrogen, alkyl, aryl, or the atoms that together with Z and Y.sub.2 complete a ring;
- R.sub.3 is alkylene, arylene, or the atoms that together with Z and Y.sub.2 complete a ring;
- Z represents the atoms necessary to complete a ring with R.sub.2 or R.sub.3 and Y.sub.2 ;
- Y.sub.2 is a carbon or nitrogen atom in a group that, when n is 1, provides a distance between the ketone groups that enables a nucleophilic displacement reaction to occur;
- BAL' is an organic group that provides sufficient bulk with the remainder of the molecule to maintain the coupler in the layer in which it is coated;
- T.sub.1 and T.sub.2 are individually releasable timing groups;
- L is linking group comprising an alkyl, aryl, alkaryl or heterocyclyl group that links the coupler moiety to the remainder of the molecule;
- and
- one of BAL', T.sub.1, T.sub.2, L or P.sub.1 contains a sulfur, nitrogen or oxygen atom through which it is bonded to the adjacent carbonyl group.
Dependencies are inferred from the claim text.