Stabilizers for use in substantially light-insensitive thermographic recording materials

US6902880B2 · kind B2 · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Ingrid Geuens · Emblem, BE
• Johan Loccufier · Zwijnaarde, BE

Key dates

• Filing date: Nov 10, 2003
• Grant date: Jun 7, 2005
• Expiry date: Nov 21, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/166
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A substantially light-insensitive black and white monosheet thermographic recording material comprising a support and a thermosensitive element, the thermosensitive element containing a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one stabilizer selected from the group consisting of 1-(5-mercapto-1-tetrazolyl)-acetyl compounds represented by formula (I): wherein R1 is —NR2R3, —OR4 or an optionally substituted aryl or heteroaryl group; R2 is hydrogen or an optionally substituted alkyl, aryl or heteroaryl group; R3 is an optionally substituted aryl or heteroaryl group; and R4 is an optionally substituted aryl group; and compounds with two or more groups represented by formula (II): where Q comprises the necessary atoms to form a 5- or 6-membered unsaturated heterocyclic ring, A is hydrogen, a counterion to compensate the negative charge of the thiolate group or two or more A groups provide a linking group between the two or more groups represented by formula (II).