Patent ID: 6306572
Filing Date: 2001-10-23
Classification: G03C

Abstract:
A process for producing a substantially light-insensitive black and white thermographic material, comprising a support and a thermosensitive element which comprises a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith and a binder, wherein said binder is a water-dispersible film-forming polymer having monomer units containing one or more carboxylic acid or carboxylic anhydride groups, said process comprising:(i) producing an aqueous dispersion of particles of the substantially light-insensitive silver salt;(ii) modifying said dispersion of the silver salt into another aqueous dispersion comprising the silver salt, the reducing agent, and the binder; and(iii) coating the aqueous dispersion recited in step (ii) onto the support.