Thermographic recording material with improved image tone

US6774084B2 · kind B2 · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Johan Loccufier · Zwijnaarde, BE
• Geert Defieuw · Kessel-Lo, BE
• Ivan Hoogmartens · Wilrijk, BE

Key dates

• Filing date: Mar 26, 2002
• Grant date: Aug 10, 2004
• Expiry date: Jan 1, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C1/49845
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A monosheet black and white substantially light-insensitive thermographic recording material comprising a thermosensitive element and a support, the thermosensitive element containing a substantially light-insensitive organic silver salt, a 1,2-dihydroxyphenyl-compound in thermal working relationship therewith and a binder, wherein said 1,2-dihydroxyphenyl-compound is represented by formula (I): R1SO2R2, wherein R1 is an optionally substituted aryl group and R2 is selected from the group consisting of a 3,4,5-trihydroxyphenyl group, a 3-alkoxy-4,5-dihydroxyphenyl group and a 3-aryloxy-4,5-dihydroxyphenyl group; or said 1,2-dihydroxyphenyl-compound is represented by formula (II): R3COOR4, wherein R3 is a 3-alkoxy-4,5-dihydroxyphenyl group or a 3-aryloxy-4,5-dihydroxyphenyl group; and R4 is an alkyl group or an aryl group; and a thermographic recording process therefor.