Patent ID: 7291441

Claim:
A positive resist composition comprising: (A) a resin that comprises a repeating unit represented by formula (1) and a repeating unit represented by formula (2), and that increases a solubility of the resin (A) in an alkaline developer by an action of an acid; and (B) a compound that generates an acid upon treatment with one of an actinic ray and radiation: wherein R 1 represents a hydrogen atom or an alkyl group; R 2 represents an alkyl group or an alkoxy group; R 3 represents a hydrogen atom, an alkyl group, an alkoxy group, a carboxyl group or a group represented by —COOR 7 , in which R 7 represents a hydrocarbon group; R 4 represents a hydrogen atom or an alkyl group; X represents a methylene group or an oxygen atom; R 6 represents a hydrogen atom or an alkyl group; A 1 represents a single bond or a divalent connecting group; A 3 represents a single bond or a divalent connecting group; and ALG represents a partial structure including an alicyclic hydrocarbon represented by formulae (pI) to (pV): wherein R 11 represents an alkyl group; and Z represents an atomic group necessary for forming an alicyclic hydrocarbon group together with a carbon atom; R 12 to R 16 each independently represents an alkyl group or an alicyclic hydrocarbon group, provided that at least one of R 12 to R 14 or one of R 15 and R 16 represents an alicyclic hydrocarbon group; R 17 to R 21 each independently represents a hydrogen atom, an alkyl group or an alicyclic hydrocarbon group, provided that at least one of R 17 to R 21 represents an alicyclic hydrocarbon group, and one of R 19 and R 21 represents an alkyl group or an alicyclic hydrocarbon group; and R 22 to R 25 each independently represents an alkyl group or an alicyclic hydrocarbon group, provided that at least one of R 22 to R 25 represents an alicyclic hydrocarbon group, and R 23 and R 24 may be mutually bonded to form a ring.