Patent ID: 8486605

Claim:
A positive resist composition comprising: a base material component (A) which exhibits increased solubility in an alkali developing solution under the action of acid; and an acid generator component (B) which generates acid upon exposure; dissolved in an organic solvent (S), wherein said base material component (A) includes a resin component (A1) having a structural unit (a0) represented by general formula (a0-1) shown below, a structural unit (a1) derived from an acrylate ester containing an acid dissociable, dissolution inhibiting group, a structural unit (a2) derived from an acrylate ester containing a lactone-containing cyclic group and a structural unit (a5) represented by general formula (a5-1) shown below, and said organic solvent (S) includes butoxypropanol, and at least one organic solvent (S2) selected from the group consisting of propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether and cyclohexanone, with the proviso that the amount of butoxypropanol is from 60 to 99% by weight and the amount of the component (S2) is from 1 to 40% by weight within the component (S), wherein R represents a hydrogen atom, a lower alkyl group of 1 to 5 carbon atoms or a halogenated lower alkyl group of 1 to 5 carbon atoms; Y 1 represents an aliphatic hydrocarbon group which may have a substituent; Z represents a monovalent organic group; a represents an integer of 1 to 3, and b represents an integer of 0 to 2, with the provision that a+b=1 to 3; and each of c, d and e independently represents an integer of 0 to 3, wherein R represents a hydrogen atom, a lower alkyl group of 1 to 5 carbon atoms or a halogenated lower alkyl group of 1 to 5 carbon atoms; Y 3 represents an aliphatic hydrocarbon group which may have a substituent; each of g and h independently represents an integer of 0 to 3; and i represents an integer of 1 to 3.