Silver halide light sensitive emulsion layer having enhanced photographic sensitivity

US6153371A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Samir Y. Farid · Rochester, US
• Ian R. Gould · Pittsford, US
• Stephen A. Godleski · Fairport, US
• Jerome R. Lenhard · Fairport, US
• Annabel A. Muenter · Rochester, US
• Paul A. Zielinski · Rochester, US

Key dates

• Filing date: Jul 17, 1998
• Grant date: Nov 28, 2000
• Expiry date: Jul 17, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2200/34
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

This invention comprises a photographic element comprising a support and at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula: EQU Q-XY wherein Q represents the atoms necessary to form a chromophore comprising an amidinium-ion, a carboxyl-ion or dipolar-amidic chromophoric system when conjugated with XY, and XY is a fragmentable electron donor moiety in which X is an electron donor group and Y is a leaving group other than hydrogen, and wherein: PA1 1) XY has an oxidation potential between 0 and about 1.4 V; PA1 2) the oxidized form of XY undergoes a bond cleavage reaction to give the radical X.sup..cndot. and the leaving fragment Y. In a preferred embodiment of the invention, the radical X.cndot. has an oxidation potential <-0.7V.