A method for modifying a phase change ink jet head by applying a non-wetting material to the discharge surface is provided such that an ink contact angle between about 80.degree. and about 90.degree. is maintained on the discharge surface after continued exposure to molten phase change inks. Furthermore,...http://www.google.com.au/patents/US5378504?utm_source=gb-gplus-sharePatent US5378504 - Method for modifying phase change ink jet printing heads to prevent degradation of ink contact angles
