G - Physics – 03 – C
Patent
G - Physics
03
C
42/4
G03C 1/42 (2006.01) C07C 37/11 (2006.01) C07C 37/14 (2006.01) C07C 37/52 (2006.01) C07C 45/00 (2006.01) G03C 1/498 (2006.01) G03C 5/30 (2006.01)
Patent
CA 1073206
Abstract of the Disclosure Thermographic recording material or image-receiving material for dry copying processes comprising at least one layer and a substantially non-photosensitive reducible silver salt, a reducing agent, and optionally a toning agent or toning mixture, wherein the reducing agent corresponds to the following general formula : wherein : each of R1, R3 and R5 (equal or different) represents hydrogen, a straight-chain or branched alkyl group comprising 1 to 9 carbon atoms, or a cycloalkyl group, with the pro- viso that R1 and R5 do not represent hydrogen simulta- neously, R2 represents a straight-chain or branched alkyl group com- prising 1 to 4 carbon atoms, or a cycloalkyl group, R4 represents hydrogen, or a straight-chain or branched alkyl group comprising 1 to 4 carbon atoms 9 or a cycloalkyl group, and wherein each of R1 and R2 together, R2 and R3 together or R and R5 together optionally represent a straight- chain or branched alkylene group for completing a 6- membered ring, with the proviso that R1, R5 or R3 does not represent t-butyl, if the respective adjacent sub- GV.808 stituent(s) represent(s) a staight-chain or branched alkyl group.
228500
Besauw Jan F. Van
Klein Alfons
Poot Albert L.
Wedemeyer Karlfried
Willems Jozef F.
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