Patent ID: 7250246

Claim:
A positive resist composition comprising: (A) a resin comprising a repeating unit represented by formula (I) and a repeating unit represented by formula (II), the resin increasing the dissolution rate in an alkali developer by the action of an acid; (B) a compound capable of generating an acid upon irradiation with actinic rays or radiation; and (C) a solvent: wherein R 1 represents a hydrogen atom or a hydrocarbon group, R 2 represents a hydrocarbon group, and X represents a single bond or a carbonyl group; wherein R 3 represents a hydrogen atom, a methyl group or a halogen atom, and R 4 represents a group represented by the following formula (A): wherein L represents a hydrogen atom, an alkyl group, a cycloalkyl group or an aralkyl group, and Z represents a cycloalkyl group, an aralkyl group, or an alkyl group having a cyclic carbon structure as a substituent, provided that at least one of R 2 and R 4 is a group capable of decomposing by the action of an acid.