Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1995-02-03
1997-09-02
Chea, Thorl
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430223, 430224, 430225, 430617, G03C 1498
Patent
active
056630425
ABSTRACT:
A thermographic element comprising in a non-aqueous binder medium a silver salt oxidizing agent in reactive association with a compound comprising a plurality of redox color releasing moieties such that oxidation of each redox color releasing moiety causes release from said compound of a thermally diffusible dye.
The compounds many of which are new incorporate two or more developer moieties into a single molecule to minimize the diffusibility of the compound. Following oxidation, either directly by the silver salt or by means of a cross-oxidizing agent, each oxidized developer moiety releases a thermally diffusible dye. The compounds are of sufficient size and molecular weight to slow or prevent diffusion in imaging systems and yet possess several active developer moieties per molecule which is advantageous over known ballasted dye releasers which comprise bulky molecules with only a single developer moiety.
REFERENCES:
patent: 4713316 (1987-12-01), Kubodera et al.
patent: 5316887 (1994-05-01), Arnost et al.
European Patent Application No. 0 149 260 A1, published on Jul. 24, 1985, relating to "Compounds for Use in Dye Diffusion Transfer Process and Photographic Elements Incorporating Them".
European Patent Application No. 0 343 717 A2, published on Nov. 29, 1989, relating to "UV Stabilizers for Organic Polymers".
European Patent Application No. 0 350 202, A3, published on Jan. 10, 1990, relating to "Photothermographic Elements".
Journal of Organic Chemistry of the USSR, Russian original vol. 21, No. 3, Part 2, Mar., 1985, pp. 565-570.
Bays David C.
Bottomley William E.
Eian Gilbert L.
Grieve Duncan McL. A.
Ishida Takuzo
Chea Thorl
Griswold Gary L.
Kirn Walter N.
Litman Mark A.
Minnesota Mining and Manufacturing Company
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