Patent ID: 7033743

Claim:
A substantially light-insensitive black and white monosheet thermographic recording material comprising a support and further comprising on one side of said support a thermosensitive element and at least two layers comprising a barrier layer and an outermost protective layer, said thermosensitive element being exclusive of a high contrast agent and comprising at least one substantially light-insensitive silver salt of a carboxylic acid, at least one reducing agent therefor in thermal working relationship therewith, at least one toning agent and at least one binder, wherein said at least one reducing agent is an ortho-dihydroxy-benzene derivative and said barrier layer comprises a copolymer comprising vinyl chloride units and vinyl acetate and/or vinyl alcohol units, a copolymer comprising styrene units and acrylonitrile units, a copolymer comprising cationic units and/or a copolymer comprising styrene units and maleic acid units.