Development inhibitor releasing coupler and photographic element

Details Development inhibitor releasing coupler and photographic element Development inhibitor releasing coupler and photographic element

1976-12-29

1978-06-20

Talbert, Jr., Dennis E.

Gas separation: apparatus

Electric field separation apparatus

Collecting electrode details

96 565, 96 663, 96109, G03C 140, G03C 530, G03C 700, G03C 134

Patent

active

040959848

ABSTRACT:
A photographic coupler capable of releasing a development inhibitor upon reaction with an oxidation product of a color developing agent and represented by the following general formula (I) or (II) ##STR1## wherein A represents a coupler residue; Z represents a sulfur atom, a selenium atom or an oxygen atom; R.sup.1 represents an aliphatic group; R.sup.2 and R.sup.3, which may be the same or different, each represents a hydrogen atom, an aliphatic group, an alkoxy group, a hydroxy group, or an aromatic group, and R.sup.2 and R.sup.3 can combine and represent the atoms necessary to form a benzene ring or a naphthalene ring, ##STR2## wherein A represents a coupler residue; R.sup.4 represents an aliphatic group or an aromatic group; and R.sup.5 and R.sup.6 which may be the same or different, each represents a hydrogen atom, an aliphatic group or an aromatic group; and silver halide photographic elements containing these photographic couplers. These photographic couplers are particularly useful for controlling or modifying a number of photographic characteristics such as sharpness, graininess and color quality in a multilayer color photographic material.

REFERENCES:
patent: 2324123 (1943-07-01), Weissberger
patent: 3933500 (1976-01-01), Shiba et al.
patent: 3967965 (1976-07-01), Adachi et al.

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