Thermal transfer printing

Abstract

A thermal transfer printing sheet comprising a substrate having a coating of a disazo of Formula (1): ##STR1## wherein: each R independently is selected from --H; --CH.sub.3 ; --CN; --NO.sub.2 ; m--COT.sup.1 ; --SO.sub.2 T.sup.1 ; m--COOT.sup.2 ; --COOPh; --SO.sub.2 F; --SO.sub.2 Cl; and --COOT.sup.2 OT.sup.3; n is 1 or 2; R.sup.2 is --H or C.sub.1-4 -alkyl; R.sup.3 is --CN; R.sup.4 is --H, C.sub.1-6 -alkylCO.OC.sub.1-6 -alkyl-, C.sub.1-6 -alkylOCOC.sub.1-6 -alkyl- or C.sub.1-6 -alkyl; R.sup.5 is C.sub.1-6 -alkylCO.OC.sub.3-6 -alkyl- or C.sub.1-6 -alkylOCOC.sub.3-6 -alkyl-; and R.sup.6 is selected from --H; C.sub.1-4 -alkyl; and --NHCOT.sup.1 ; wherein T.sup.1 is C.sub.1-6 -alkyl or phenyl, T.sup.2 is C.sub.1-6 -alkyl, and T.sup.3 is C.sub.1-6 -alkyl. The above transfer printing sheets are used to produce printed receiver sheets in a dye diffusion thermal transfer printing process. The derived printed receiver sheets have good optical densities, are fast to light and heat and are particularly resistant to finger grease.

Dependencies are inferred from the claim text.