Solid ink jet printhead having a polymer layer and processes therefor

• Main Authors: ANDREWS JOHN R, LIN PINYEN
• Format: Patent
• Language: Chinese; English
• Published: 08.06.2011
• Subjects: CORRECTION OF TYPOGRAPHICAL ERRORS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; PERFORMING OPERATIONS; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; TYPEWRITERS

A printhead assembly includes a plurality of functional plates bonded together in a stack by polymeric adhesive(s). The surfaces of the functional plates that contact the polymeric adhesives are subjected to a coating process that includes providing a coating of an adhesion promoter, namely polydopamine, prior to application of the adhesive. The adhesive may be a crosslinkable acrylic adhesive or a thermoplastic polyimide. The polydopamine coating is applied by immersing the functional plate in a buffered dopamine solution for a period sufficient to produce a coating having a pre-determined thickness. The thickness of the coating is controlled by submerging the functional plate in the buffered dopamine solution while the pH value of the dopamine solution is maintained at a value sufficient for polymerization of the dopamine during that time period, and then transferring the plates to a solution having a pH value that is insufficient to sustain the polymerization reaction.