Photographic element with improved sensitivity and improved keeping

US6514683B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Annabel A. Muenter · Rochester, US
• Steven P. Szatynski · Rochester, US
• Sharon Johnston · Pittsford, US

Key dates

• Filing date: Jan 5, 2001
• Grant date: Feb 4, 2003
• Expiry date: Jan 5, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2200/24
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

This invention comprises a photographic element comprising at least one light-sensitive silver halide emulsion layer containing a fragmentable electron donating compound of the formula: X—Y′ or a compound which contains a moiety of the formula —X—Y′;whereinX is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is a proton, a base, &bgr;−, is present in the emulsion layer, and wherein:1) X—Y′ has an oxidation potential between 0 and about 1.4 V; and2) the oxidized form of X—Y′ undergoes a bond cleavage reaction to give the radical X• and the leaving fragment Y′; and3) the radical X• has an oxidation potential ≦−0.7V; said photographic element further comprising a reductone of the Formula 2: wherein R23 and R24 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as —OH, sulfonamide, sulfamoyl, or carbamoyl, or R23 and R24 may be joined to complete a heterocyclic ring, R21 and R22 are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, …