Direct thermographic materials with catechol borate reducing agents
AssigneeCarestream Health, Inc.
InventorsKumars Sakizadeh, Peter J. Cowdery-Corvan, Leif P. Olson, David R. Whitcomb
Life of this patent
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Abstract
Non-photosensitive direct thermographic materials comprise a reducing agent that is a catechol borate compound. These compounds can reduce silver(I) ion to metallic silver to produce a dense black silver image under the short time and high temperature conditions that occur when using thermal print-heads during direct thermal printing.
Claims20
A black and white non-photosensitive direct thermographic material comprising a support and on one or both sides thereof, one or more thermally sensitive imaging layers having in reactive association, a non-photosensitive source of reducible silver ions and a catechol borate reducing agent for said reducible silver ions.
A black and white non-photosensitive direct thermographic material comprising a transparent support and on the frontside thereof, one or more thermally sensitive imaging layers having in reactive association,
- a non-photosensitive source of reducible silver ions that includes one or more silver carboxylates, one of which is silver behenate,
- a catechol borate reducing agent represented by the following Structure (I):
- wherein R1 and R2 are independently halo, nitro, cyano, alkylsulfonyl, or arylsulfonyl groups, n and m are both 1, and M+ represents alkali metal cation,
- an overcoat layer that is the outermost layer of said material and comprises matte particles, one or more silicone oils of category (d), and one or more compounds from any of the following categories (a), (b), and (c):
- (a) solid polymers, each derived from one or more olefins and from one or more ethylenically unsaturated polymerizable carboxylic acids or esters or anhydrides thereof,
- (b) branched α-olefin polymers,
- (c) additional waxes other than compounds in categories of (a) and (b), and
- (d) silicone oils,
- and having a conductive layer comprising non-acicular metal antimonate particles composed of ZnSb2O6 on the backside side of said transparent support.
Dependencies are inferred from the claim text.