Patent ID: 6120983
Filing Date: 2000-09-19
Classification: G03C

Abstract:
A photothermographic material comprising (a) a reducible silver source, (b) a photocatalyst, (c) a reducing agent, (d) a binder, and (e) at least one compound of the following formula (I-a): ##STR15## wherein D is an electron donative group of atoms represented by the following formula (D-1), (D-2) or (D-3): ##STR16## wherein each of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, and R.sub.9 is a hydrogen, C.sub.1-30 alkyl, C.sub.2-30 alkenyl, C.sub.2-30 alkynyl, C.sub.6-20 aryl, or a 3- to 10-membered heterocyclic group, orR.sub.1 and R.sub.2, R.sub.3 and R.sub.4, R.sub.4 and R.sub.5, R.sub.6 and R.sub.7, R.sub.7 and R.sub.8, and R.sub.8 and R.sub.9, taken together, may form a 5- to 8-membered nitrogenous heterocyclic ring, orR.sub.3 and R.sub.4 or R.sub.4 and R.sub.5, taken together, may form a ring which is 2,3-diazabicyclo[2.2.1]heptane, orR.sub.4 and R.sub.5, taken together, may form a ring which is an azepane or azokane;L.sub.a is a .dbd.N-- combined with a C.sub.2-6 alkylene,L.sub.2 is a C.sub.2-6 alkylene group,each of R.sub.a and R.sub.b is selected from the group consisting of hydrogen, C.sub.1-20 alkyl, C.sub.2-20 alkenyl, C.sub.2-20 alkynyl, C.sub.6-30 aryl, C.sub.0-20 amino, C.sub.1-20 alkoxy, C.sub.6-20 aryloxy, C.sub.1-20 acyl, C.sub.2-20 alkoxycarbonyl, C.sub.7-20 aryloxy, C.sub.2-20 acyloxy, C.sub.2-20 acylamino, C.sub.2-20 alkoxycarbonylamino, C.sub.7-20 aryloxycarbonylamino, C.sub.1-20 sulfonylamino, C.sub.0-20 sulfamoyl, C.sub.1-20 carbamoyl, C.sub.1-20 alkylthio, C.sub.6-20 arylthio, C.sub.1-20 sulfonyl, C.sub.1-20 sulfinyl, C.sub.1-20 ureido, C.sub.1-20 phosphoric amide, hydroxy, mercapto, halogen, cyano, sulfo, sulfino, carboxyl, phosphono, phosphino, nitro, hydroxamic acid, hydrazino, imino, imidazolyl, pyridyl, furyl, piperidyl and morpholino, orR.sub.a and R.sub.b, may form a ring, taken together, selected from the group consisting of benzene, cyclopentene, cyclohexene, pyridine, pyrimidine, and pyrazole, andM.sub.1 is a hydrogen atom or cation.