Patent ID: 8794743

Claim:
A printhead assembly arranged to dispense ultraviolet curable ink or gel ink comprising: a reservoir to hold ultraviolet curable ink or gel ink; a plurality of functional plates stacked together and comprising a first plate and a second plate adiacent to the first plate; a first adhesive layer arranged between, and physically contacting, the first plate and the second plate to provide bonding between the first plate and the second plate, wherein the first adhesive layer has a storage modulus between about 100 MPa and 1500 MPa at about 20° C. and between about 3 MPa and 700 MPa at about 120° C.; a second adhesive layer arranged between, and physically contacting, the first plate and the second plate to provide bonding between the first plate and the second plate; an ink path for the ultraviolet curable ink or gel ink formed by the first plate, the second plate, and the second adhesive layer, wherein: the second adhesive layer is exposed to the ink path; the first adhesive layer is not exposed to the ink path; the first adhesive layer has a first chemical resistance to the ultraviolet curable ink or gel ink when exposed thereto, the second adhesive layer has a second chemical resistance to the ultraviolet curable ink or gel ink when exposed thereto, where the second chemical resistance is greater than the first chemical resistance; and the second adhesive layer has a storage modulus that is higher than the storage modulus of the first adhesive layer.