Patent ID: 7261994

Claim:
A positive resist composition comprising a base resin component (A) and an acid generator component (B) generating an acid under exposure, wherein the base resin component (A) is a silicone resin, and the acid generator component (B) contains an onium salt-based acid generator (B1) containing a perfluoroalkyl sulfonate ion having 3 or 4 carbon atoms as an anion wherein the base resin component (A) is a resin component (A1) having an acid dissociable dissolution inhibiting group, the dissolution inhibiting group being dissociated by action of an acid thereby to enhance alkali solubility; and wherein the resin component (A1) contains a silsesquioxane resin (A12) comprising a constituent unit (a1) represented by the following general formula (I): wherein R 1 represents a linear or branched alkylene group having 1 to 5 carbon atoms; a constituent unit (a5) represented by the following general formula (V): wherein R 5 represents a linear or branched alkylene group having 1 to 5 carbon atoms, R 6 represents an alkyl group having 1 to 5 carbon atoms, R 7 represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom, and R 8 represents an alicyclic hydrocarbon group having 5 to 15 carbon atoms; and a constituent unit (a3) represented by the following general formula (III): wherein the total content of the constituent units (a1) and (a5) is 50% by mole or more based on the total amount of all constituent units of the silsesquioxane resin (A12), and the content of the constituent unit (a5) is 5% by mole or more and 50% by mole or less based on the total amount of the constituent units (a1) and (a5); and the content of constituent unit (a3) in the silsesquioxane resin (A12) is from 20 to 50% by mole.