Patent ID: 8771927

Claim:
A method of forming a microelectronic structure, said method comprising: providing a substrate having a surface; optionally forming a primer layer on said substrate surface; forming a protective layer on said primer layer, if present, or on said substrate surface if no primer layer is present, to yield a protected stack, said protective layer being formed from a composition comprising a cycloolefin copolymer of recurring cycloolefin monomers and monomers of where: - - - - - is a single bond; and each R 4 is individually selected from the group consisting of —H and alkyl groups; said cycloolefin copolymer being dissolved or dispersed in a solvent system, wherein said protective layer would experience very little or no acid etchant penetration if etched by an approximately 48% by weight aqueous HF solution, having a temperature of about 20-25° C., for about 1-2 hours; and subjecting said protected stack to an acidic etching process.