EP 1435298 A2 20040707 - Toning agents for use in thermographic and photothermographic recording materials
Title (en)
Toning agents for use in thermographic and photothermographic recording materials
Title (de)
Tönungsmittel für thermographische und photothermographische Materialien
Title (fr)
Agents d'amélioration du ton pour des matériaux thermographiques et photothermographiques.
Publication
Application
Priority
- EP 03104600 A 20031209
- EP 02102832 A 20021219
Abstract (en)
A 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 toning agent, characterized in that the at least one toning agent is represented by formula (I): <CHEM> wherein R<1> is a hydrogen atom or an alkyl, an alkenyl, an alkynyl, a cycloalkyl, an alkaryl, an aryl, a heterocyclic or a heteroaryl group all of which may be optionally substituted; with the proviso that R<1> may not be a hydrogen atom if both R<2> and R<3> are both hydrogen atoms; R<2> and R<3> are independently a hydrogen or a halogen atom or an amino, amide, ester, carboxy, carbonato, alkyl, alkenyl, alkynyl, cycloalkyl, alkaryl, aryl, heterocyclic or heteroaryl group all of which may be optionally substituted; R<2> and R<3> may together represent the atoms necessary to complete a heteroaromatic ring with no more than one nitrogen atom, an alicyclic or a heterocyclic group which all may be optionally substituted; and X is a carbonyl group, or is -N-R<4>, where R<4> is an alkyl group. The element may also contain a photosensitive silver halide.
IPC 1-7
IPC 8 full level
B41M 5/32 (2006.01); G03C 1/498 (2006.01)
CPC (source: EP)
G03C 1/49845 (2013.01); G03C 1/4989 (2013.01); G03C 2200/40 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 03104600 A 20031209