Patent ID: 7972763
Filing Date: 2011-07-05
Classification: G03F,Y10S

Abstract:
1. A chemically amplified positive resist composition comprising (A) a resin obtainable by reacting a novolak resin, a poly(hydroxystyrene) and a compound having at least two vinyl ether structures, and (B) an acid generator; wherein the chemically amplified positive resist composition further contains at least one selected from a poly(hvdroxystyrene) wherein a part of hydroxyl groups are protected by 1-alkoxyalkyl groups which may be substituted or 2-oxocycloalkyl groups; and a resin containing a structural unit which has an acid-labile group and which itself is insoluble or poorly soluble in an aqueous alkali solution but becomes soluble in an aqueous alkali solution by the action of an acid.