High temperature processing of photographic silver halide material

US4132551A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Robert J. Pollet · Vremde, BE
• Robrecht J. Thiers · Brasschaat, BE
• Theofiel H. Ghys · Kontich, BE
• Antoon L. Vandenberghe · Hove, BE
• Herman A. Philippaerts · Edegem, BE
• Hubert Vandenabeele · Mortsel, BE

Key dates

• Filing date: Jan 15, 1975
• Grant date: Jan 2, 1979
• Expiry date: Jan 15, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C5/305
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for producing photographic images by development of an exposed silver halide element at elevated temperature is provided wherein the development occurs in the presence of a non-quaternary, non-heterocyclic nitrobenzene compound of the formula: ##STR1## WHEREIN: (R).sub.n stands for one or more substituents selected from hydrogen, halogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, alkoxy, substituted alkoxy, alkylmercapto, substituted alkylmercapto, amino, substituted amino, aryl, substituted aryl, hydroxy, nitro, cyano, sulpho or carboxy in acid or salt form, alkoxycarbonyl and an acyl group derived from a carboxylic or sulphonic acid. The nitrobenzene compounds have a favorable effect on the sensitometric properties of the silver halide emulsion that are developed at elevated temperature. They reduce the supplemental fog produced by development at elevated temperature.