Silver halide light sensitive emulsion layer having enhanced photographic sensitivity

US5994051A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Ian R. Gould · Pittsford, US
• Samir Y. Farid · Rochester, 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 30, 1999
• 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 at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula X--H, wherein X is an electron donor moiety to which a base, B.sup.-, is covalently linked and H is a leaving hydrogen atom, and wherein: PA1 1) X--H has an oxidation potential between 0 and about 1.4 V; and PA1 2) the oxidized form of X--H undergoes deprotonation reaction with the base B.sup.-, to give the radical X.sup..cndot. and the protonated base B-H. In a preferred embodiment of the invention, the radical X.cndot. has an oxidation potential <-0.7V.