Barrier layers for use in substantially light-insensitive...

Details Barrier layers for use in substantially light-insensitive... Barrier layers for use in substantially light-insensitive...

2006-04-25

2006-04-25

Schilling, Richard L. (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified backing or protective layer containing

C430S616000, C430S620000, C430S961000, C430S964000, C430S965000, C503S210000

Reexamination Certificate

active

07033743

ABSTRACT:
A substantially light-insensitive black and white monosheet thermographic recording material has a support and on one side of the support comprises a thermosensitive element, a barrier layer and an outermost protective layer, the thermosensitive element being exclusive of a high contrast agent and containing 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 the at least one reducing agent is an ortho-dihydroxy-benzene derivative and the 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.

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