Blue sensitizing dyes with heterocyclic substituents

US6066443A · kind A · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Thomas R. Dobles · Hilton, US
• Richard L. Parton · Webster, US
• Pamela M. Ferguson · Farmington, US
• Nona Veith Spitzner · Bergen, US
• David A. Stegman · Churchville, US
• Steven G. Link · Rochester, US
• Kenneth J. Reed · Brighton, US
• Marian S. Henry · Rochester, US

Key dates

• Filing date: Jul 16, 1996
• Grant date: May 23, 2000
• Expiry date: Jul 16, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2200/40
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A photographic element having a silver halide emulsion spectrally sensitized to blue light by a dye of formula (I) to have a maximum blue sensitivity at less than 485 nm. The dye allows the element to have good color reproduction while still providing good speed response despite the shorter blue sensitivity. Formula (I) is: ##STR1## wherein: X and X' each independently represent the atoms necessary to complete a thiazole, benzothiazole, naphthothiazole, oxazole, benzoxazole, naphthoxazole, selenazole, benzoselenazole, naphthoselenazole, imidazole, benzimidazole, or naphtho-imidazole, and X may be further substituted and X' substituted or unsubstituted; PA1 Z.sub.1 represents a pyrrole, furan or thiophene containing group; PA1 R.sub.1 and R.sub.2 each independently represent substituted or unsubstituted hydrocarbon containing 1 to 10 carbon atoms; and PA1 A represents a counter-ion as needed to balance a charge of the molecule.