Direct thermal imaging process with improved tone reproduction

Details Direct thermal imaging process with improved tone reproduction Direct thermal imaging process with improved tone reproduction

1995-05-24

1996-06-18

Hess, B. Hamilton

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Method of use, kit, or combined with marking instrument or...

430338, 503202, 503208, 503210, 503211, 503217, 503218, 503225, B41M 5035, B41M 538

Patent

active

055277586

ABSTRACT:
A direct thermal imaging process wherein a non-photosensitive direct thermal recording material is heated dot-wise, and said direct thermal recording material comprises an imaging layer containing uniformly distributed in a film-forming polymeric binder (i) one or more substantially light-insensitive organic silver salts, said silver salt(s) being uniformly in thermal working relationship with (ii) one or more organic reducing agents therefor, however neither including 3,5-dihydroxybenzoic acid as acidic reagent nor di-tert-butyl-p-cresol as a sole reducing agent, characterized in that said imaging layer contains at least one polycarboxylic acid and/or anhydride thereof in a molar percentage of at least 20 with respect to said silver salt(s).

REFERENCES:
patent: 3080254 (1963-03-01), Grant
patent: 3094417 (1963-06-01), Workman
patent: 3795532 (1974-03-01), Newman et al.
patent: 4082901 (1978-04-01), Laridon et al.
patent: 4173482 (1979-11-01), Akashi et al.

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