Binders for thermographic materials

US6300052A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Frank Louwet · Diepenbeek, BE
• Huub Van Aert · Pulderbos, BE
• Frank Ruttens · Overijse, BE
• Ivan Hoogmartens · Wilrijk, BE

Key dates

• Filing date: Aug 21, 1998
• Grant date: Oct 9, 2001
• Expiry date: Aug 21, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/4989
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A substantially light-insensitive black and white thermographic material comprising a support and a thermosensitive element containing a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith and a binder, wherein the binder is a water-dispersible film-forming polymer having covalently bonded ionic groups and the thermographic material is thermally developable under substantially water-free conditions; and a process for producing the substantially light-insensitive black and white thermographic material comprising the steps of: producing an aqueous dispersion of the substantially light-insensitive organic silver salt; producing one or more aqueous coating compositions containing together the aqueous dispersion of the substantially light-insensitive organic silver salt, the reducing agent and the binder; and applying the one or more aqueous coating compositions to the support, thereby forming after drying the thermosensitive element.