Patent ID: 8252518
Filing Date: 2012-08-28
Classification: G03F

Abstract:
1. A resist patterning process to form a resist pattern by a lithography, wherein a chemically amplified positive resist composition is applied on a photomask blank by a spin coating method to give a chemically amplified resist film having a film thickness of 10 to 100 nm, which is then exposed to a high energy beam and developed thereafter by using an alkaline developer, wherein the chemically amplified positive resist composition comprises at least: (A) a base resin, insoluble or poorly soluble in an alkaline solution, having a repeating unit whose phenolic hydroxy group is protected by a tertiary alkyl group, wherein 95% or more by mol of the repeating unit composing the base resin (A) comprises combination of the repeating units represented by the following general formula (2) or (3), while soluble in an alkaline solution when the tertiary alkyl group is removed, (B) an acid generator containing at least one or more kinds of compounds represented by the following general formula (4), (C) a basic component containing at least one or more kinds of compounds represented by the following general formulae (5) to (7), and the basic component further containing at least one or more kinds of an amine compound and an amine oxide compound represented by the following general formulae (8) and (9), (D) an organic solvent; and a solid component concentration is controlled so that the chemically amplified resist film having the film thickness of 10 to 100 nm is obtained by a spin coating method.