Patent ID: 8142977

Claim:
A positive resist composition, comprising: (B1) a resin capable of decomposing under an action of an acid to increase a solubility of the resin (B1) in an aqueous alkali solution, the resin (B1) containing at least one of a repeating unit represented by formula (Ia) and a repeating unit represented by formula (IIa); (B2) a resin capable of decomposing under an action of an acid to increase a solubility of the resin (B2) in an aqueous alkali solution, the resin (B2) containing a repeating unit represented by formula (IIb); and a repeating unit represented by formula (III) containing at least two aromatic ring structures; and (A) a compound capable of generating an acid upon irradiation with actinic rays or radiation; wherein X represents a hydrogen atom, a methyl group or a halogen atom; A l represents a hydrogen atom or a group capable of leaving under an action of an acid, and when a plurality of A I 's are present, the plurality of A i 's may be the same or different; L represents a monovalent organic group, a halogen atom, a cyano group or a nitro group, and when a plurality of L's are present, the plurality of L's may be the same or different; n represents an integer of 1 to 3; and m represents an integer of 0 to 2; wherein Y represents a hydrogen atom, a methyl group, a halogen atom, a cyano group, a hydroxymethyl group, an alkoxymethyl group or an acyloxymethyl group; and A 2 represents a group capable of leaving under an action of an acid; wherein Y represents a hydrogen atom, a methyl group, a halogen atom, a cyano group, a hydroxymethyl group, an alkoxymethyl group or an acyloxymethyl group; and A 4 represents a hydrogen atom or a group capable of leaving under an action of an acid; wherein Y represents a hydrogen atom, a methyl group, a halogen atom, a cyano group, a hydroxymethyl group, an alkoxymethyl group or an acyloxymethyl group; L 1 represents a single bond, an arylene group, an aralkylene group, a carbonyl group, an ester group, an imino group or an ether group, or a divalent linking group including a combination of at least two kinds of groups thereof; AR 1 represents a phenylene group or a naphthylene group; L 2 represents —OCO—; AR 2 represents a phenyl group or a naphthyl group, and when a plurality of AR 2 's are present, the plurality of AR 2 's may be the same or different; and n represents an integer of 1 or 2.