Patent ID: 8450044

Claim:
A positive resist composition comprising a resin component (A) which exhibits increased solubility in an alkali developing solution under action of acid and an acid-generator component (B) which generates acid upon exposure, the base component (A) comprising a polymeric compound (A1) comprising: a structural unit (a1) containing an acid dissociable, dissolution inhibiting group, a structural unit (a5) containing a base dissociable group, and a structural unit (a6) represented by general formula (a6-1) shown below: wherein R represents a hydrogen atom, an alkyl group of 1 to 5 carbon atoms or a halogenated alkyl group of 1 to 5 carbon atoms; each of R 2 and R 3 independently represents a hydrogen atom or an alkyl group that may contain an oxygen atom at an arbitrary position, or R 2 and R 3 are bonded together to form an alkylene group; and W represents a cyclic alkylene group that may include an oxygen atom at an arbitrary position.