an ink composition comprised of a polyesterified - dye or polyurethane - dye with a viscosity of from about 3 centipoise to about 20 centipoise at a temperature of from about 125 ° c . to about 165 ° c . and represented by the formulas ## str1 ## wherein a is an organic chromophore , y is an oxyalkylene or poly , r is an arylene or alkylene , n represents the number of repeating segments , and is an integer of from about 2 to about 50 , and p represents the number of chains per chromophore and is an integer of from about 1 to about 6 .