a method of minimizing kogation of a heater element in a thermal inkjet printhead . the method comprises the steps of : supplying an inkjet ink to a nozzle chamber of the printhead ; and repeatedly actuating a heater element in the nozzle chamber so as to heat a portion of the ink to a temperature sufficient to form a bubble therein , thereby causing droplets of ink to be ejected from a nozzle opening associated with the nozzle chamber . the ink comprises an acrylic polymer having a glass transition temperature of less than about 100 ° c ., which minimizes kogation of the heater element .