Patent ID: 8105747

Claim:
A positive resist composition comprising a resin component (A) which exhibits changed alkali solubility under action of acid and an acid-generator component (B) which generates acid upon exposure, said resin component (A) comprising a copolymer (A1) comprised of a structural unit (a1) represented by general formula (II) shown below: wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group or a halogenated lower alkyl group; each of R 1 to R 3 independently represents an alkyl group or a fluorinated alkyl group, with the provision that no fluorine atom is bonded to a carbon atom adjacent to the tertiary carbon atom to which R 1 to R 3 are bonded, and at least one of R 1 to R 3 represents a fluorinated alkyl group; and R 2 and R 3 may form a ring structure.