Patent ID: 6783918
Filing Date: 2004-08-31
Classification: B41J,C08G,G03F

Abstract:
A radiation curable resin formulation suitable for planarizing an ink jet heater chip with a thickness ranging from about 1 to about 5 microns, the resin formulation consisting essentially of a multifunctional epoxy component, a difunctional epoxy component having a weight average molecular weight above about 2500, a silane coupling agent, an aryl sulfonium salt photoinitiator, and a non-photoreactive solvent, wherein the resin formulation is substantially devoid of acrylate polymer components and the resin formulation contains from about 60 to about 85 weight percent of the difunctional epoxy to component and from about 12 to about 22 weight percent of the photoinitiator based on the weight of the cured resin.