Photographic element and process comprising a compound which comprises two timing groups in sequence
AssigneeEastman Kodak Company
InventorsPaul A. Burns, Terry R. Taber
Life of this patent
Estimating the term…
Abstract
Photographic compounds capable of releasing a photographically useful group are more effective in photographic materials when the photographic compounds comprise at least two differing timing groups in sequence between a carrier moiety and the photographically useful group. The two timing groups in sequence enable improved timing and control of release of the photographically useful group.
Claims16
In a photographic element comprising a support, at least one photographic emulsion layer and at least one compound A capable upon reaction in a coupling position with an oxidized color developing agent of releasing a photographically useful group, the improvement
- wherein the compound A comprises at least two differing timing groups in sequence capable, upon activation, of timing the release of the photographically useful group and
- wherein two separate fragments are formed from the two differing timing groups upon processing the photographic element.
In a photographic element comprising a support, at least one photographic emulsion layer and at least one coupler capable upon reaction in a coupling position with an oxidized color developing agent of releasing a photographically useful group, the improvement
- wherein the coupler comprises at least two differing timing groups in sequence capable, upon activation, of timing the release of the photographically useful group and
- wherein two separate fragments are formed from the two differing timing groups upon processing the photographic element.
A photographic element comprising a support, at least one photographic silver halide emulsion layer and at least one coupler capable upon reaction with oxidized color developing agent of releasing a photographically useful group;
- wherein the coupler comprises at least two differing timing groups, in sequence capable, upon activation, of timing the release of the photographically useful group;
- wherein two separate fragments are formed from the two differing timing groups upon processing the photographic element;
- and
- the coupler is represented by the formula:
- ##STR80## wherein:
- R.sub.26 is substituted or unsubstituted alkyl, or substituted or unsubstituted aryl;
- R.sub.27 is hydrogen or a substituent which does not adversely affect timing of release of the other portions of the photographic coupler;
- R.sub.28 is hydrogen or a substituent which advantageously influences the timing of release of PUG;
- COUP is a coupler moiety substituted in the coupling position by the remainder of the coupler;
- PUG is a photographically useful group;
- m and n are individually 0 or 1;
- Z.sub.5 represents the atoms necessary to complete a carbocyclic or heterocyclic ring.
A process of forming a photographic image which comprises developing an exposed photographic silver halide emulsion layer with a color developing agent in the presence of a compound A capable of releasing a photographically useful group,
- wherein the compound A comprises in a position that reacts with oxidized color developing agent at least two differing timing groups in sequence capable upon activation of timing the release of the photographically useful group and
- wherein two separate fragments are formed from the two differing timing groups.
A process of forming a photographic image which comprises developing an exposed photographic silver halide emulsion layer with a color developing agent in the presence of at least one coupler capable upon reaction with oxidized color developing agent of releasing a photographically useful group;
- wherein the coupler comprises at least two differing timing groups, in sequence capable, upon activation, of timing the release of the photographically useful group;
- wherein two separate fragments are formed from the two differing timing groups upon processing the photographic element;
- and,
- the coupler is represented by the formula:
- ##STR83## wherein:
- R.sub.26 is substituted or unsubstituted alkyl, or substituted or unsubstituted aryl;
- R.sub.27 is hydrogen or a substituent which does not adversely affect timing of release of the other portions of the photographic coupler;
- R.sub.28 is hydrogen or a substituent which advantageously influences the timing of release of PUG;
- COUP is a coupler moiety substituted in the coupling position by the remainder of the coupler;
- PUG is a photographically useful group;
- m and n are individually 0 or 1;
- Z.sub.5 represents the atoms necessary to complete a carbocyclic or heterocyclic ring.
Dependencies are inferred from the claim text.