Photographic elements containing a de-aggregating compound and dye-forming coupler
AssigneeEastman Kodak Company
InventorsDanuta Gibson, David Clarke, Christopher J. Winscom
Life of this patent
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Abstract
The invention relates to a photographic element comprising at least one light-sensitive silver halide emulsion layer having associated therewith in the same dispersion a certain de-aggregating hydrogen bond donating and hydrogen bond accepting compound and at least one pyrazole fused ring derivative coupler. The combination provides improved colour reproduction.
Claims28
A photographic element comprising at least one light-sensitive silver halide emulsion layer having associated therewith in the same dispersion a de-aggregating compound of formula (I) and at least one heterocyclic cyan dye-forming coupler of formula (II),
- wherein
- the de-aggregating compound has the formula (I)
- wherein
- A is a hydrogen-bond-accepting hetero -atom or -group;
- Y is a hydrogen-bond-donating hetero -atom or -group;
- L is a linking group that is partially or wholly conjugated with A and linked to A by a carbon atom;
- n is 1, 2 or 3 hydrogen-bond-containing moieties;
- and
- (B) comprises the remaining atoms for completion of an unsubstituted or substituted heterocyclic ring or ring system containing the hydrogen bond-accepting hetero -atom or -group, which may contain one or more other heteroatoms selected from nitrogen, oxygen and sulfur;
- and
- wherein
- the heterocyclic cyan dye-forming coupler has the formula (II):
- wherein
- R1 is hydrogen or a substituent;
- Rc is a substituent;
- and
- q is 0 to 4;
- Za represents the atoms necessary to complete an unsubstituted or substituted 5- to 10-membered heterocyclic ring system which may contain one or more other heteroatoms selected from nitrogen, oxygen and sulfur;
- providing that each Rc is attached to a carbon atom of the ring;
- and
- X is selected from hydrogen or halogen or a group which is separable by the reaction of coupler with an oxidized colour developing agent.
A multi-colour photographic element comprising a support bearing yellow, magenta and cyan image-dye-forming units comprising at least one blue-, green- or red-sensitive silver halide emulsion layer having associated therewith at least one yellow, magenta or cyan dye-forming coupler respectively, wherein the element comprises at least one light-sensitive silver halide emulsion layer having associated therewith in the same dispersion a de-aggregating compound of formula (I) and at least one heterocyclic cyan dye-forming coupler of formula (II),
- wherein
- the de-aggregating compound has the formula (I)
- wherein
- A is a hydrogen-bond-accepting hetero -atom or -group;
- Y is a hydrogen-bond-donating hetero -atom or -group;
- L is a linking group that is partially or wholly conjugated with A and linked to A by a carbon atom;
- n is 1, 2 or 3 hydrogen-bond-containing moieties;
- and
- (B) comprises the remaining atoms for completion of an unsubstituted or substituted heterocyclic ring or ring system containing the hydrogen bond-accepting hetero -atom or -group, which may contain one or more other heteroatoms selected from nitrogen, oxygen and sulfur;
- and
- wherein
- the heterocyclic cyan dye-forming coupler has the formula (II):
- wherein
- R1 is hydrogen or a substituent;
- Rc is a substituent;
- and
- q is 0 to 4;
- Za represents the atoms necessary to complete an unsubstituted or substituted 5- to 10-membered heterocyclic ring system which may contain one or more other heteroatoms selected from nitrogen, oxygen and sulfur;
- providing that each Rc is attached to a carbon atom of the ring;
- and
- X is selected from hydrogen or halogen or a group which is separable by the reaction of coupler with an oxidized colour developing agent.
A process of forming an image in a photographic element after the element has been imagewise exposed to light, comprising contacting the element with a colour developing agent, wherein the element comprises at least one light-sensitive silver halide emulsion layer having associated therewith in the same dispersion a de-aggregating compound of formula (I) and at least one heterocyclic cyan dye-forming coupler of formula (II),
- wherein
- the de-aggregating compound has the formula (I)
- wherein
- A is a hydrogen-bond-accepting hetero -atom or -group;
- Y is a hydrogen-bond-donating hetero -atom or -group;
- L is a linking group that is partially or wholly conjugated with A and linked to A by a carbon atom;
- n is 1, 2 or 3 hydrogen-bond-containing moieties;
- and
- (B) comprises the remaining atoms for completion of an unsubstituted or substituted heterocyclic ring or ring system containing the hydrogen bond-g hetero -atom or -group, which may contain one or more other heteroatoms selected from nitrogen, oxygen and sulfur;
- and
- wherein
- the heterocyclic cyan dye-forming coupler has the formula (II):
- wherein
- R1 is hydrogen or a substituent;
- Rc is a substituent;
- and
- q is 0 to 4;
- Za represents the atoms necessary to complete an unsubstituted or substituted 5- to 10-membered heterocyclic ring system which may contain one or more other heteroatoms selected from nitrogen, oxygen and sulfur;
- providing that each Rc is attached to a carbon atom of the ring;
- and
- X is selected from hydrogen or halogen or a group which is separable by the reaction of coupler with an oxidized colour developing agent.
Dependencies are inferred from the claim text.