Back to results
US 5,962,212 AGranted
Thermographic recording element
AssigneeFuji Photo Film Co., Ltd.
InventorsHiroyuki Suzuki, Toshiaki Kubo, Kohzaburoh Yamada
Life of this patent
Estimating the term…
Abstract
A thermographic recording element comprising an organic acid silver salt, a reducing agent, a specific hydrazine derivative, and optionally, a photosensitive silver halide is improved in storage stability and forms images having high Dmax.
Claims11
A thermographic recording element comprising at least an organic acid silver salt, a reducing agent, and a hydrazine derivative of the following formula (I):
- ##STR103## wherein R.sub.1 is an aromatic, aliphatic or heterocyclic group, A.sub.1 and A.sub.2 are both hydrogen, or one of A.sub.1 and A.sub.2 is hydrogen and the other is a substituted or unsubstituted alkylsulfonyl, substituted or unsubstituted arylsulfonyl, or substituted or unsubstituted acyl group, R.sub.2 and R.sub.3 are independently hydrogen or substituents, and X is --OH, --SH, --NHCOR, --NHSO.sub.2 R, --NHCONRnRn', --NHSO.sub.2 NRnRn', --NHCO.sub.2 R, --NHCOCONRnRn', --NHCOCO.sub.2 R, --NHCONRnSO.sub.2 R or --NRnRn' wherein R is a substituted or unsubstituted alkyl, aryl or heterocyclic group, Rn and Rn' are independently hydrogen, substituted or unsubstituted alkyl, aryl or heterocyclic groups.
Dependencies are inferred from the claim text.