Patent ID: 7504196

Claim:
A positive resist composition, comprising: a base material component (A) that contains an acid-dissociable, dissolution-inhibiting group and exhibits increased alkali solubility under action of acid; and an acid generator component (B) that generates acid upon exposure, wherein said base material component (A) contains a compound (A1), in which either a portion of, or all of, hydrogen atoms of phenolic hydroxyl groups within a polyhydric phenol compound, which has two or more phenolic hydroxyl groups, a molecular weight of 300 to 2,500, and is represented by a general formula (I) shown below, have been substituted with an acid-dissociable, dissolution-inhibiting group (II) represented by a general formula (II) shown below: [wherein, R 11 to R 17 each represent, independently, an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group, which may include a hetero atom within a structure thereof; g and j each represent, independently, an integer of 1 or greater, and k and q each represent, independently, either 0 or an integer of 1 or greater, provided that g+j+k+q is no greater than 5; h represents an integer of 1 or greater, and 1 and m each represent, independently, either 0 or an integer of 1 or greater, provided that h+l+m is no greater than 4; i represents an integer of 1 or greater, and n and o each represent, independently, either 0 or an integer of 1 or greater, provided that i+n+o is no greater than 4; p represents 1; and X represents a group represented by a general formula (Ia) shown below]: [wherein, R 18 and R 19 each represent, independently, an alkyl group of 1 to 10 carbon atoms or an aromatic hydrocarbon group, which may include a hetero atom within a structure thereof; and r, y and z each represent, independently, either 0 or an integer of 1 or greater, provided that r+y+z is no greater than 4]; [wherein, R 1 represents a straight-chain lower alkyl group of 1 to 5 carbon atoms, which may include a hetero atom within a structure thereof; and R 2 represents a hydrogen atom or a lower alkyl group of 1 to 5 carbon atoms].