N-alkyl-N-para-aminoaryl substituted dicyanovinyl aniline dyes for use in thermal transfer printing

A dye donor element for use according to thermal dye transfer methods comprising a support having thereon a dye layer comprising a binder and a yellow dye of the class of N-alkyl-N-para-aminoaryl-substituted dicyanovinylaniline dyes corresponding to the following general formula (I):

• ##STR20## wherein:
• X represents a substituent selected from the group consisting of an alkenyl group, an aryl group, a halogen, an acylamino group, an aminocarbonyl group, an alkoxy group, an aryloxy group and an alkenyloxy group,
• Aryl represents an aryl group para substituted with NR.sup.1 R.sup.2,
• R represents an alkyl group,
• R.sup.1, R.sup.2 each independently represents hydrogen, an alkyl group, an aryl group or R.sup.1 and R.sup.2 together with the atoms to which they are attached represent the necessary atoms to complete a ring system.