Patent ID: 9115255
Filing Date: 2015-08-25
Classification: B41N,C08J,G03F

Abstract:
1. A method of forming a self-assembled block copolymer film, the method comprising: forming a crosslinked copolymer film on a substrate surface, the crosslinked copolymer film comprising crosslinked random copolymer chains, wherein the random copolymer chains comprise styrene monomers copolymerized with crosslinkable epoxy group-functionalized monomers and, optionally, one or more additional monomers, wherein the epoxy group-functionalized monomers are acrylate monomers, methacrylate monomers or styrenic monomers and further wherein the epoxy groups are not part of an epoxy group-containing cycloaliphatic group; the random copolymer chains comprising at least 5 mol. % of the epoxy group-functionalized monomers and no greater than 5 mol. % of the additional monomers; depositing a block copolymer over the crosslinked copolymer film, wherein the block copolymer comprises copolymerized styrene monomers and further wherein the crosslinked copolymer film provides a neutral layer for the self-assembly of the block copolymer into vertical domains; and subjecting the block copolymer to conditions that induce the block copolymer to self-assemble into vertical domains.