Patent ID: 7179578

Claim:
A positive resist composition comprising (A) a resin containing a repeating unit represented by the following formula (Ia) and a repeating unit represented by formula (Ib), which is a resin having an aliphatic cyclic hydrocarbon group on the side chain and capable of increasing the dissolution rate in an alkali developer under the action of an acid, (B) a compound capable of generating an acid upon irradiation with actinic rays or radiation, and (C) a fluorine-containing surfactant and/or a silicon-containing surfactant: wherein in formulae (Ia) and (Ib), each R 1 independently represents a hydrogen atom or an alkyl group and A represents a linking group, in formula (Ia), R 11 represents an alkyl group having from 1 to 4 carbon atoms and Z represents an atomic group necessary for forming an alicyclic hydrocarbon group together with the carbon atom, in formula (Ib), R 12 to R 14 each independently represents a hydrocarbon group, provided that at least one of R 12 to R 14 represents an alicyclic hydrocarbon group, and wherein the total content of both the repeating unit represented by formula (Ia) and the repeating unit represented by formula (Ib) in the resin as the component (A) is from 30 to 70 mol %, based on all repeating structural units.