Patent ID: 8793873
Filing Date: 2014-08-05
Classification: B41J,Y10T

Abstract:
1. A method of providing a printhead assembly having a hydrophilic ink pathway and a hydrophobic ink ejection face, the method comprising the steps of: providing a printhead assembly having an inkjet printhead attached to an ink supply manifold, the inkjet printhead comprising a nozzle plate having a hydrophobic coating and a protective metal film disposed on the hydrophobic coating; treating surfaces of an ink pathway in the printhead assembly with a solution comprising an alkoxylated polyethyleneimine; drying the surfaces; and removing the protective metal film so as to reveal the hydrophobic coating, thereby providing the printhead assembly having the hydrophilic ink pathway and the hydrophobic ink ejection face, wherein said method further comprises the step of: plasma activating the surfaces of the ink pathway before treating the surfaces with the solution comprising the alkoxylated polyethyleneimine.