Laminates utilizing chemically etchable adhesives

Claim 1

A laminate comprising in order a metallic layer, an adhesive composition layer and an etchable polyimide layer, wherein the adhesive composition comprises a cross-linked reactive oligomer having in a backbone hydrolyzable phenolic ester groups of an equivalent weight in a range from 200 to 10,000, with the requirement that a 50 micrometer thick film of the composition after cure disintegrates within 50 cycles of alternatingly submersing the film in a stirred solution containing by weight 13% potassium hydroxide, 11% distilled water, and 76% ethanol at 60° C. for 1 minute, and in a stirred bath of deionized water at 60° C. for 30 seconds, one submersion in the ethanolic potassium hydroxide solution followed by one submersion in the deionized water, constituting one cycle.