Patent ID: 7332100
Filing Date: 2008-02-19
Classification: B41J

Abstract:
1. A process for protectively coating, against aggressive liquids, hydraulic microcircuits made in a resin, said process comprising: a) providing a die comprising a silicon substrate covered by a plurality of metallic and dielectric layers, and also comprising a sacrificial metallic layer defining the inner shape of said hydraulic microcircuits; b) depositing on an outer surface of said sacrificial metallic layer, in an electrochemical process, at least one metallic protective coating layer; c) applying on said metallic protective coating layer an adhesion layer to promote the adhesion of a resin on said metallic protective coating layer; d) depositing on said adhesion layer a non-photosensitive epoxy or polyamide resin, having a predetermined thickness and completely covering said sacrificial layer; e) polymerizing said resin to increase its mechanical resistance to mechanical and thermal stresses; and f) removing said sacrificial metallic layer via a chemical etching, by means of a acid bath.