Patent ID: 6277554
Filing Date: 2001-08-21
Classification: G03C

Abstract:
A thermographic recording element having at least one image forming layer and comprising an organic silver salt, a photosensitive silver halide, a reducing agent, a hydrazine derivative, and at least one compound selected from compounds of the following formulas (A) and (B): ##STR305##wherein Z.sub.1 is a group of non-metallic atoms completing a 5- to 7-membered cyclic structure, Y.sub.1 is --C(.dbd.O)-- or --SO.sub.2 --, and X.sub.1 is a hydroxyl group or salt thereof, alkoxy group, aryloxy group, heterocyclic oxy group, mercapto group or salt thereof, alkylthio group, arylthio group, heterocyclic thio group, acylamino group, sulfonamide group or heterocyclic group, the compound of formula (A) having at least 6 carbon atoms in total, ##STR306##wherein Z.sub.2 is a group of non-metallic atoms completing a 5- to 7-membered cyclic structure, Y.sub.2 is --C(.dbd.O)-- or --SO.sub.2 --, X.sub.2 is a hydroxyl group or salt thereof, alkoxy group, aryloxy group, heterocyclic oxy group, mercapto group or salt thereof, alkylthio group, arylthio group, heterocyclic thio group, acylamino group, sulfonamide group or heterocyclic group, and Y.sub.3 is hydrogen or an optionally substituted substituent selected from the group consisting of alkyl, aryl, heterocyclic, cyano, acyl, alkoxycarbonyl, aryloxycarbonyl, carbamoyl, amino, alkylamino, arylamino, heterocyclicamino, acylamino, sulfonamide, ureido, thioureido, imide, alkoxy, aryloxy, alkylthio, arylthio, and hetrocyclicthio, the compound of formula (B) having at least 12 carbon atoms in total.