| 摘要 |
A black and white monosheet substantially light-insensitive 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, wherein the at least one toning agent is selected from compounds represented by formula (I): wherein R<1 >is an alkyl group optionally substituted with a hydroxy, carboxy, carboxy ester, acyl or carbonato group; X is S, O or N-R<6>; R<6 >is an optionally substituted alkyl group; R<2>, R<3>, R<4 >and R<5 >independently represent a hydrogen atom, a halogen atom or an alkyl, an alkoxy, a thio-alkoxy, a nitro, a cyano, a carboxy, a carboxy ester, an acyl, an aldehyde, an acylamido, a sulphonamido, an acylamino, a carbonato, a hydroxy or an aryl group or at least one of R<2 >and R<3>, R<3 >and R<4 >and R<4 >and R<5 >independently represent the atoms necessary to form a carbocyclic or heterocyclic group or at least one of R<1 >and R<5 >and R<2 >and R<6 >independently represent the atoms necessary to form a heterocyclic ring; and compounds represented by formula (II): wherein R<7 >is an optionally substituted alkyl group; Y is S, O or N-R<10>; R<10 >is an optionally substituted alkyl group; R<8 >and R<9 >independently represent a hydrogen atom, a halogen atom or an alkyl, an alkoxy, a thio-alkoxy, a nitro, a cyano, a carboxy, a carboxy ester, an acyl, an aldehyde, an acylamido, a sulphonamido, an acylamino, a carbonato, a hydroxy or an aryl group or R<8 >and R<9 >represent the atoms necessary to form a heterocyclic or a non-aromatic carbocyclic ring or at least one of R<8 >and R<10 >and R<9 >and R<7 >independently represent the atoms necessary to form a heterocyclic ring; and both R<8 >and R<9 >cannot both be an alkyl group.
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