Patent ID: 6893792

Claim:
A positive resist composition comprising a resin which itself is insoluble or poorly soluble in an alkali aqueous solution but becomes soluble in an alkali aqueous solution by the action of an acid, and an acid generator, wherein the content of halogen atoms in the resin is 40% by weight or more, at least one of structural units constituting the resin is a structural unit having an alicyclic hydrocarbon skeleton, and the structural unit having an alicyclic hydrocarbon skeleton contains therein at least one group rendering the resin soluble in an alkali aqueous solution by the action of an acid, and at least one halogen atom, wherein the cyclic hydrocarbon skeleton is an alicyclic hydrocarbon skeleton of the formula (2′): wherein X represents a halogen atom, R 8 represents a hydrogen or an acid-unstable group dissociating in the presence of an acid, R 7 represents an alkyl group having 1 to 6 carbon atoms substituted with at least one halogen atom or alicyclic hydrocarbon group substituted with at least one halogen atom, and n represents 0 or 1.