Patent ID: 6261753
Filing Date: 2001-07-17
Classification: C09B,G03C,Y10S

Abstract:
A recording material which contains, in at least one hydrophilic colloidal layer, an infrared absorbing agent comprising a dyestuff of the general formula I ##STR6##in which R.sup.1, R.sup.2 and R.sup.3 independently of one another are hydrogen, (C.sub.1 -C.sub.6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R.sup.3 furthermore is also halogen or (C.sub.3 -C.sub.7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings, and M.sup.+ is a monovalent cation or one equivalent of a polyvalent cation, but excluding the compound of general formula I in which R.sup.1 and R.sup.2 are methyl, R.sup.3 is hydrogen and M.sub.+ is 1/2 Ni.sup.2+.