Patent ID: 7550250

Claim:
A positive resist composition, which comprises: (A) a resin having a monocyclic or polycyclic alicyclic hydrocarbon structure, of which solubility in an alkali developer increases under an action of an acid; (B) a compound capable of generating an acid upon irradiation with actinic rays or radiation; (C) a resin having a repeating unit represented by formula (C) and not containing either a silicon atom or a fluorine atom; and (D) a solvent, wherein a content of the resin as the component (C) is from 0.1 to 20 mass % based on a solid content of the positive resist composition: wherein X 1 , X 2 and X 3 each independently represents a hydrogen atom, an alkyl group or a halogen atom; L represents a single bond or a divalent linking group; and Rp 1 represents an acid-decomposable group.