Thermally developable imaging materials containing heat-bleachable antihalation composition

US6558880B1 · kind B1 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Ramanuj Goswami · Webster, US
• William D. Ramsden · Afton, US
• Paul A. Zielinski · Rochester, US
• David G. Baird · Woodbury, US
• LuAnn K. Weinstein · Rochester, US
• Margaret J. Helber · Webster, US
• Doreen C. Lynch · Afton, US

Key dates

• Filing date: Jun 6, 2001
• Grant date: May 6, 2003
• Expiry date: Jun 6, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/165
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Photothermographic materials comprise heat-bleachable antihalation compositions in backside antihalation layers. These compositions comprise a hexaarybiimidazole and an oxonol dye that can be represented by the following Structure I:A1═L1—(L2═L3)p—(L4═L5)q—(L6═L7)r—A2−(M)kwherein A1 and A2 are the same or different activated methylene moieties, L1 through L7 independently represent a substituted or unsubstituted methine group, M represents a counterion, k is the number of M counterions necessary to provide neutral charge for Structure I, p, and q, are independently 0 or 1, and r is 0, 1, or 2. The antihalation composition is typically bleached when subjected to a temperature of at least 90° C. for at least 0.5 seconds.