Patent ID: 8338075

Claim:
A positive resist composition comprising: a base component (A) which exhibits increased solubility in an alkali developing solution under the action of acid; and an acid-generator component (B) which generates acid upon exposure; dissolved in an organic solvent (S), said base component (A) comprising a resin component (A1) which exhibits increased solubility in an alkali developing solution under the action of acid, said resin component (A1) comprising a structural unit (a1) derived from an acrylate ester containing an acid dissociable, dissolution inhibiting group, and said organic solvent (S) comprising an alcohol-based organic solvent having a boiling point of at least 150° C., wherein said alcohol-based organic solvent is at least one solvent selected from the group consisting of propylene glycol, 1-butoxy-2-propanol, n-hexanol, 2-heptanol, 3-heptanol, 1-heptanol, 5-methyl-1-hexanol, 6-methyl-2-heptanol, 1-octanol, 2-octanol, 3-octanol, 4-octanol, 2-ethyl-1-hexanol 2-(2-butoxyethoxy)ethanol and an alcohol-based organic solvent having a ring structure.