Dye-donor element for use according to thermal dye sublimation transfer comprising a support having on one side a dye layer and on the other side a heat-resistant layer, characterized in that said heat-resistant layer comprises a polyether containing at least 10 mol % recurring units corresponding to the following formula (I)O--E--O--E'-- (I)wherein--O--E--O-- represents a divalent diphenolate radical corresponding to the following general formula (II) ##STR1## wherein R.sub.1 and R.sub.2 (same or different) represent hydrogen, halogen, a C.sub.1 -C.sub.8 alkyl group, a C.sub.5 -C.sub.6 cycloalkyl group, a C.sub.6 -C.sub.10 aryl group or a C.sub.7 -C.sub.12 aralkyl group; andX represents the necessary atoms to close a 5- to 8-membered cycloaliphatic ring which may be substituted with one or more C.sub.1 -C.sub.6 alkyl groups or 5- to 6-membered cycloalkyl groups or carry fused-on 5- or 6-membered cycloalkyl groups;--E'-- represents a divalent radical of an aromatic sulfone corresponding to the following general formula (III) ##STR2## or a divalent radical of a diarylketone corresponding to the following general formula (IV) ##STR3## or a divalent radical of benzonitrile corresponding to the following general formula (V) ##STR4## wherein Ar and Ar' in formula III and IV (same or different) represent difunctional aromatic radicals having 6 to 50 carbon atoms.