Patent ID: 8507174

Claim:
A positive resist composition, comprising: (A) a compound capable of generating an acid upon irradiation with an actinic ray or radiation; (B) a resin capable of increasing a solubility of the resin (B) in an alkali developer by an action of an acid; and (C) a compound represented by the following formula (I), which decomposes by an action of an acid to generate an acid: wherein R 1 represents an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group or an aryloxy group; R 2 represents an alkyl group or a cycloalkyl group; R 1 and R 2 may combine with each other to form a monocyclic or polycyclic hydrocarbon structure; each of R 3 and R 4 independently represents a hydrogen atom or an alkyl group; R 5 represents a group capable of leaving by an action of an acid; X represents —SO 2 13 , —SO— or —CO—; and Z represents a residue of an organic acid represented by ZH; wherein the compound represented by formula (I) is a compound represented by the following formula (Ia): wherein R 1 represents an alkyl group, a cycloalkyl group, an alkoxy group, an aryl group or an aryloxy group; R 2 represents an alkyl group or a cycloalkyl group; R 1 and R 2 may combine with each other to form a monocyclic or polycyclic hydrocarbon structure; each of R 3 and R 4 independently represents a hydrogen atom or an alkyl group; X represents —SO 2 —, —SO— or —CO—; Z represents a residue of an organic acid represented by ZH; and each of Ry 1 to Ry 3 independently represents an alkyl group or a cycloalkyl group, and at least two members out of Ry 1 to Ry 3 may combine with each other to form a monocyclic or polycyclic hydrocarbon structure, provided that at least one of Ry 1 to Ry 3 represents a cycloalkyl group or at least two members out of Ry 1 to Ry 3 are combined to form a monocyclic or polycyclic hydrocarbon structure.