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US 5,958,664 AGranted
Coupler capable of releasing a development accelerator
AssigneeEastman Kodak Company
InventorsSiu-Chung Tsoi, Peter J. Twist, David T. Southby
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AssigneeEastman Kodak Company
InventorsSiu-Chung Tsoi, Peter J. Twist, David T. Southby
Estimating the term…
The present invention relates to a new coupler which is capable of releasing a development accelerator having the formula: ##STR1## wherein COUP is a coupler moiety, T is a timing group and n is 0, 1 or 2, A is a group capable of being adsorbed to the silver halide surface, L is a linking group and r is 0 or 1, and R.sub.1 and R.sub.2 are independently selected from an alkyl group, substituted or unsubstituted, and an aryl group, substituted or unsubstituted. The present invention also concerns a photographic silver halide recording material containing such a coupler and further relates to a process for processing such a material. The invention provides a new DARC compound showing improved speed increase without undue fog formation.
A photographic material comprising a support bearing at least one photosensitive silver halide emulsion layer and a coupler capable of releasing a development accelerator on color development in the presence of a bi-nucleophilic agent, characterized in that said material comprises a coupler capable of releasing a development accelerator represented by formula (I) ##STR7## wherein COUP is a coupler moiety,
A process for processing an imagewise exposed photographic material containing a coupler capable of releasing a development accelerator represented by formula (I) ##STR8## wherein COUP is a coupler moiety,
Dependencies are inferred from the claim text.