Patent ID: 8622534
Filing Date: 2014-01-07
Classification: B41J

Abstract:
1. A method of minimizing kogation of a heater element in a thermal inkjet printhead, said method comprising the steps of: (i) supplying an inkjet ink to at least one nozzle chamber of the printhead; and (ii) 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 a droplet of ink to be ejected from a nozzle opening associated with the nozzle chamber, wherein said ink comprises a styrene-acrylic copolymer having a glass transition temperature (Tg) in the range of 5 to 30° C. and an acid value in the range of 100 to 180 mgKOH/g, said styrene-acrylic copolymer minimizing kogation of said heater element.