A thermal dye transfer assemblage comprising:(a) a dye-donor element comprising a support having thereon a dye layer comprising a dye dispersed in a polymeric binder, the dye being substituted with a reactive primary or secondary aliphatic amino group, and(b) a dye-receiving element comprising a support having thereon a dye image-receiving layer, the dye-receiving element being in a superposed relationship with the dye-donor element so that the dye layer is in contact with the dye image-receiving layer, the dye image-receiving layer comprising a polymer containing a plurality of functional groups:R.sup.2 --CO--X--R.sup.3 wherein:R.sup.2 represents alkyl, aryl, alkoxy or aryloxy;X represents oxygen or sulfur; andR.sup.3 represents aryl or hetaryl; with the proviso that R.sup.2 or R.sup.2 and R.sup.3 are directly attached to the polymer chain.