| abstract |
A thermal recording element comprising a support having thereon a dye layer comprising a polymeric binder containing: (a) a metallized complex of a formazan dye that absorbs at from about 400 to about 850 nm; and (b) an organic carboxylic acid; the dye layer having associated therewith: (c) a hexaarylbiimidazole which is an oxidative dimer of a 2,4,5-triarylimidazole having one of the following formulas: <IMAGE> <IMAGE> wherein: R, R1 and R2 each independently represents hydrogen, a substituted or unsubstituted alkyl or alkoxy group of from 1 to about 12 carbon atoms, amino, a substituted or unsubstituted cycloalkyl group having from about 5 to about 7 carbon atoms, or an electron-rich heterocyclic group having from about 5 to about 7 atoms, with the proviso that at least one of R and R1 is the alkoxy or amino group; X and X1 each independently represents oxy or imino; Z is an alkylene group of 1 or 2 carbon atoms; and m, n and o each independently represents an integer of 0 to 5. |