Patent ID: 8586281

Claim:
A positive resist composition comprising: a base component (A) that exhibits increased solubility in an alkali developing solution under action of acid; and a sensitizer (G), wherein said sensitizer (G) is at least one compound selected from the group consisting of a polymeric compound (G1) having a core portion that includes a hydrocarbon group or a heterocycle of two or more valences and also at least one arm portion that is bonded to said core portion and is represented by general formula (1) shown below, and a polymeric compound (G2) having a core portion that includes a polymer having a molecular weight of 500 or more and 20,000 or less and also at least one arm portion that is bonded to said core portion and is represented by general formula (1) shown below; and said base component (A) includes a resin component (A1) that generates acid upon exposure and also exhibits increased solubility in an alkali developing solution under action of acid, and said component (A1) includes a structural unit (a0-2) having a group represented by general formula (a0-2-10) or (a0-2-20) shown below and generating acid upon exposure; the amount of the component (G) based on the combined total of said component (A) and said component (G) is 1 to 30% by weight: —(X)—Y (1) wherein X represents a divalent linking group having an acid dissociable group; and Y represents a polymer chain; wherein A represents a single bond or a divalent linking group; R 4 represents an arylene group which may have a substituent; each of R 5 and R 6 independently represents an organic group, wherein R 5 and R 6 may be mutually bonded to form a ring with the sulfur atom in the formula; X − represents a counter anion; each of R f1 and R f2 independently represents a hydrogen atom, an alkyl group, a fluorine atom or a fluorinated alkyl group, provided that at least one of R f1 and R f2 represents a fluorine atom or a fluorinated alkyl group; n represents an integer of 1 to 8; M m+ represents a counter cation; and m represents an integer of 1 to 3.