A phase change ink according to claim 1 wherein R1, R2, R3, and R4 each, independently of the others, is an alkyl group with at least one carbon atom and with no more than about 50 carbon atoms, an aryl group with at least about 5 carbon atoms and with no more than about 50 carbon atoms, an arylalkyl group with at least about 6 carbon atoms and with no more than about 50 carbon atoms, or an alkyla