Silver halide light sensitive emulsion layer having enhanced photographic sensitivity

US6498004B1 · kind B1 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Jerome R. Lenhard · Fairport, US
• Annabel A. Muenter · Rochester, US
• Stephen A. Godleski · Fairport, US
• Paul A. Zielinski · Rochester, US
• Deepak Shukla · Oshkosh, US
• Donald R. Diehl · Rochester, US

Key dates

• Filing date: Dec 28, 2000
• Grant date: Dec 24, 2002
• Expiry date: Dec 28, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/55
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention provides a photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula (a):&Dgr;−(t)m−XY′  (a)XY′−(t)m−&Dgr;  (b)&Dgr;−(t)m−XY′−(t)m−&Dgr;  (c)wherein &Dgr; is protective group that is eliminated during development of the photographic element, t is a timing group, m is an integer from 0 to 3, and XY′ is a fragmentable electron donor moiety in which X is an electron donor group and 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 or is covalently linked directly or indirectly to X, and wherein:1) X—Y′ has an oxidation potential between 0 and about 1.4 V;2) 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.