Reducing agents for use in thermographic recording materials

US6093528A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

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

Key dates

• Filing date: Aug 27, 1998
• Grant date: Jul 25, 2000
• Expiry date: Aug 27, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C2200/45
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A substantially light-insensitive black and white monosheet thermographic recording material is provided comprising a support and a thermosensitive element containing a substantially light-insensitive organic silver salt, a 1,2-dihydroxyphenyl-compound in thermal working relationship therewith and a binder, wherein the 1,2-dihydroxyphenyl-compound is represented by formula (I): ##STR1## where R is --P(.dbd.O)R.sup.1 R.sup.2, --SO.sub.x R.sup.3, --CN, --NO.sub.2 or --CR.sup.4 .dbd.NR.sup.5 when n is 0; R is --P(.dbd.O)R.sup.1 R.sup.2, --SO.sub.x R.sup.3, --CN, --NO.sub.2, --CR.sup.4 .dbd.NR.sup.5 or --COR.sup.6 when n is an integer; R.sup.1 and R.sup.2 are independently an alkyl, an aryl, an alkoxy, an aryloxy, a hydroxy or an amino group; R.sup.3 is an alkyl, an aryl or an amino group; R.sup.4 is an alkyl or an aryl group or hydrogen; R.sup.5 is an alkyl, an aryl, a hydroxy, an alkoxy, an aryloxy, an acyl or an amino amino group; R.sup.6 is an alkyl, an aryl, an alkoxy, an aryloxy, a hydroxy or an amino group or hydrogen; x is 1, 2 or 3; and the benzene ring of the 1,2-dihydroxyphenyl-compound represented by the formula (I) may be further substituted.