| abstract |
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. |