Photographic supports and elements utilizing photobleachable omicron-nitroarylidene dyes

A process for preparing a photographic image which comprises imagewise exposing to electromagnetic radiation a light-sensitive photographic element comprising an otherwise transparent support containing therein a dye selected from:

• a. 2-(2,4-dinitrobenzylidene)-1,3-diethyl-2,3-dihydro-1H-imidazo[4,5-b]quinox aline;
• b. 2-(2,4-dinitrobenzylidene)-3-ethyl-2,3-dihydrothiazolo[4,5-b]quinoline;
• c. 2-(2,4-dinitrobenzylidene)-3-ethyl-6-nitrobenzothiazoline;
• d. 2-(2,4-dinitrobenzylidene)-1,3,3-trimethylindolenine;
• e. 4-(2,4-dinitrobenzylidene)-1-ethylquinoline;
• and
• f. 4-(2,4-dinitrobenzylidene)-2,6-diphenyl-4H-pyran.

A process for preparing a photothermographic image employing a photothermographic element comprising an otherwise transparent support and, as a coating on the support, an image-recording layer comprising:

• a. an oxidation-reduction image-forming combination comprising
• i. a reducing agent and
• ii. a heavy metal salt oxidizing agent,
• b. a catalyst for the oxidation-reduction image-reduction image-forming combination, and
• c. a binder,
• the process comprising:
• A. choosing the support to include in an amount sufficient to impart antihalation protection a photobleachable dye having the following formula:
• ##SPC10##
• wherein:
• a. k represents 0 or 1;
• b. m represents 0 or 1;
• c. each L represents a methine group;
• d. A represents oxygen, sulfur or N--R.sub.1 ;
• e. R.sub.1 represents an alkyl group, an alkenyl group or an aryl group;
• f. Z.sub.1 represents the nonmetallic atoms completing a cyanine dye type heterocyclic nucleus comprising a 5- or 6-membered heterocyclic ring whose skeletal atoms consist of the oxygen, sulfur or nitrogen atom of A, carbon atoms and one other atom chosen from the group consisting of carbon, oxygen, nitrogen, selenium and sulfur atoms, and
• g. Y represents the atoms necessary to complete a phenyl or naphthyl group,
• B. imagewise exposing to electromagnetic radiation the image-recording layer and
• C. heating the photothermographic element to form an image.

The process for preparing a photographic image which comprises imagewise exposing to electromagnetic radiation a light-sensitive photographic element comprising a support having coated thereon a transparent polymeric binder containing a photobleachable o-nitro-substituted arylidene dye wherein said photobleachable dye has the following formula:

• ##SPC11##
• wherein:
• a. k represents 0 or 1;
• b. m represents 0 or 1;
• c. each L represents a methine group;
• d. A represents oxygen, sulfur or N--R.sub.1 ;
• e. R.sub.1 represents an alkyl group, an alkenyl group or an aryl group;
• f. Z.sub.1 represents the nonmetallic atoms completing a cyanine dye type heterocyclic nucleus comprising a 5- or 6-membered heterocyclic ring whose skeletal atoms consist of the oxygen, sulfur or nitrogen atom of A, carbon atoms and one other atom chosen from the group consisting of carbon, oxygen, nitrogen, selenium and sulfur atoms;
• and
• g. Y represents the atoms necessary to complete a phenyl or naphthyl group.

A process for preparing a photographic image which comprises imagewise exposing to electromagnetic radiation a light-sensitive photographic element comprising a support having coated thereon a transparent polymeric binder containing a dye selected from:

• a. 2-(2,4-dinitrobenzylidene)-1,3-diethyl-2,3-dihydro-1H-imidazo[4,5-b]quinox aline;
• b. 2-(2,4-dinitrobenzylidene)-3-ethyl-2,3-dihydrothiazolo[4,5-b]quinoline;
• c. 2-(2,4-dinitrobenzylidene)-3-ethyl-6-nitrobenzothiazoline;
• d. 2-(2,4-dinitrobenzylidene)-1,3,3-trimethylindolenine;
• e. 4-(2,4-dinitrobenzylidene)-1-ethylquinoline;
• and
• f. 4-(2,4-dinitrobenzylidene-2,6-diphenyl-4H-pyran.