Silver halide light sensitive emulsion layer having enhanced photographic sensitivity

US6010841A · 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: Jan 4, 2000
• Expiry date: Oct 30, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2200/24
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A photographic element comprises at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of formula EQU Z-(L-XY).sub.k wherein: PA1 Z is a light absorbing group; PA1 L is a linking group containing a least one C, N, S, or O atom; and PA1 k is 1 or 2; and PA1 XY represents a fragmentable electron donor moiety wherein: PA2 1) XY has a an oxidation potential between 0 and about 1.4 V; PA2 2) X is an electron donor group; PA2 3) Y is a leaving group other than hydrogen; and PA2 4) 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 the radical X.sup..cndot. has an oxidation potential of .ltoreq.-0.7 V.