Patent ID: 6537726
Filing Date: 2003-03-25
Classification: G03F,Y10S

Abstract:
A chemically amplified positive resist composition comprising:a resin (X) which, per se, is insoluble or slightly soluble in alkali but becomes soluble in alkali due to an action of acid, and has a polymeric unit (a) derived from 3-hydroxy-1-admantyl(meth)acrylate and a polymeric unit (b) derived from &bgr;-(meth)acryloyloxy-&ggr;-butyrolactone wherein the lactone ring may optionally be substituted by alkyl; and an acid generating agent (Y); wherein a ratio in mol of the polymeric unit (a) derived from 3-hydroxy-1-adamantyl(meth)acrylate to the polymeric unit (b) derived from &bgr;-(meth)acryloyloxy-&ggr;-butyrolactone wherein the lactone ring may optionally be substituted by alkyl is about 2:8 to 8:2.