Photographic Element Containing Scavenger for Oxidized Developing Agent

The following examples further illustrate this invention.

Compounds of the invention were evaluated in a two layer format (imaging layer and overcoat). The imaging layer was coated on a cellulose acetate support and consisted of 1.5 g/m.sup.2 gelatin, 1.1 g/m.sup.2 of image Coupler A, 1.75 g per Ag mole of tetraazaindene compound (4-hydroxy-6-methyl-1,3,3a,7 tetraazaindene), 0.75 g/m.sup.2 of silver halide emulsion and a compound of this invention in the amount indicated in Table I. Each emulsion was comprised of silver bromoiodide grains (2% iodide; 0.53 micron) which were given sensitized with Dyes B and C noted below. The overcoat consisted of 2.0 g/m.sup.2 of gelatin. The coatings were hardened with bis(vinylsulfonylmethyl)ether at a level of 1.75% of the total gelatin. Saponin was used as a surfactant in both layers. The compounds were dispersed at a 1:2 ratio in N,N-diethyldecanamide using cyclohexanone (1:3 ratio) as auxillary solvent. The dispersions were washed for 6 hours prior to coating.

Portions of the coatings were placed in a bomb containing air at 4000 psi (27,580 Pa) and 50.degree. C., and held for 6, 40, and 72 hours. The strips were then extracted to determine the amount of compound still remaining.

Stability results were as follows:

From the above data it can be seen that compounds of this invention are stable under the conditions of the test and that decomposition is avoided. Decomposition results in stain formation in the imaging layers.

Additional tests were run using coatings prepared as described in Example 1. The purpose of these tests was to show the effects of compounds of this invention on dye density values.

Each example was exposed using a 21 step tablet ranging from 0 to 3.0 density in steps of 0.15 with a 5500K illuminant for 0.02 sec. through a Wratten 8 filter.

The compounds tested were coated at two levels, 0.17 mmol/m.sup.2 and 0.2 mmol/m.sup.2, which levels correspond to 10 and 25 mol % of the amount of coupler coated. Results from the higher coating level are reported in Table II.

As can be seen from the above data compounds if this invention, even when coated at 0.42 mmol/m.sup.2, cause minimal blue or green stain, whereas the compounds of the prior art either failed to perform or performed at a substandard level.

This invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.