Patent ID: 6962773
Filing Date: 2005-11-08
Classification: G03C,Y10S

Abstract:
1. A process for preparing a substantially light-insensitive black and white thermographic recording material comprising a thermosensitive element and a support, said thermosensitive element comprising at least one substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a toning agent and a binder, wherein said thermosensitive element further comprises deliberately added metal nano-particles in a molar ratio with respect to the total molar concentration of said at least one substantially light-insensitive organic silver salt in the range of 0.05:1 to 10 −6 :1, comprising the steps of: (i) mixing a dispersion comprising at least one substantially light-insensitive organic silver salt, a suspending medium and deliberately added metal nano-particles in a molar ratio with respect to the total molar concentration of said at least one substantially light-insensitive organic silver salt in the range of 0.05:1 to 10 −6 :1, wherein said substantially light-insensitive organic silver salt is substantially insoluble in said suspending medium with a reducing agent and a toning agent; and (ii) coating the dispersion prepared in step (i) on a support.