Patent ID: 7932016
Filing Date: 2011-04-26
Classification: G03F,H01L

Abstract:
1. A method of forming a patterned layer on a substrate, comprising: (a) disposing over a substrate a photosensitive layer comprising a composition comprising: a binder polymer prepared by free radical polymerization of acrylic acid and/or methacrylic acid with one or more monomers chosen from acrylate monomers, methacrylate monomers and vinyl aromatic monomers; a free radical polymerizable monomer bearing two or more ethylenically unsaturated groups, a free radical photoinitiator; and a stable free radical inhibitor, wherein the stable free radical inhibitor is present in the composition in an amount of from 0.04 to 0.3 wt % based on the total weight of the composition; (b) imagewise exposing the photosensitive Layer to actinic radiation; and (c) developing the exposed layer, thereby forming a patterned layer; wherein (a) comprises coating the photosensitive layer by spin coating in a single application, and wherein one or more portion of the patterned layer has an aspect ratio of 1.5 or more.