Thermographic recording materials with improved image tone

US6337303B1 · kind B1 · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Philip Dooms · Edegem, BE
• Peter Michiels · Schilde, BE
• Ingrid Geuens · Emblem, BE

Key dates

• Filing date: May 31, 2000
• Grant date: Jan 8, 2002
• Expiry date: May 31, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/49809
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A substantially light-insensitive black and white thermographic recording material comprising a thermosensitive element and a support, the thermosensitive element containing at least one substantially light-insensitive organic silver salt, at least one organic reducing agent therefor in thermal working relationship therewith, a binder, at least one stabilizer and optionally an &agr;,(&ohgr;-alkyldicarboxylic acid with a straight chain alkyl group having at least 4 carbon atoms which may be substituted, however neither including 3,5-dihydroxybenzoic acid as acidic reagent nor di-tert-butyl-p-cresol as a sole organic reducing agent, wherein the at least one stabilizer is represented by formula (I):R1—(O═C)—R2—(C═O)—R3  (I)wherein R2 is a divalent straight chain saturated hydrocarbon group with 2 or 3 carbon atoms which may be substituted with one or more of ═O, ═S, ═CR4R5, an alkyl group, a cycloalkyl group, a hydroxy group, a thiol group, a —(C═O)R6 group or two of the substituents of R2 may together form a closed non-aromatic carbocyclic or heterocyclic ring; R4 and R5 are independently hydrogen or an alkyl, hy…