Silver halide light sensitive emulsion layer having enhanced photographic sensitivity

US5747235A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

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

Key dates

• Filing date: Oct 30, 1996
• Grant date: May 5, 1998
• Expiry date: Oct 30, 2016

Classification

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

Abstract

A photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula: ##STR1## wherein A is a silver halide adsorptive group that contains at least one atom of N, S, Se, or Te that promotes adsorption to silver halide, and L represents a linking group containing at least one C, N, S or O atom, k is 1 or 2, and XY is an 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; and 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.sup..cndot. has an oxidation potential .ltoreq.-0.7V.