Patent ID: 7326359

Claim:
A process for the partial demetallization of a multilayer laminate comprising a first film and a second film wherein the first film comprises a first polymeric layer and a metallic layer and the second film comprises a second polymeric layer and an adhesive layer, the process comprising applying an etchant lacquer to the metallic layer of the first polymeric film, applying an adhesive layer to the second polymeric film, and joining the first film and the second film wherein the adhesive layer of the second film contacts the partially demetallized layer of the first film, wherein the lamination step is in-line with the demetallization step, wherein the etchant lacquer comprises at least one metal dissolving etchant on the metallic layer in a quantity of about the stoichiometrical amount needed to dissolve the metallic layer and to eliminate any chemical reactivity of the at least one etchant towards the adhesive layer, wherein the dissolved metal remains within the multilayer laminate, and the dissolution of the metal creates a substantially transparent window in the metallic layer in a washing-free step.