Patent ID: 7202010

Claim:
A chemical amplification type positive resist composition comprising (A) a resin having a polymerization unit derived from p-hydroxystyrene and a polymerization unit of the formula (1) or formula (2) wherein, R 1 and R 2 each independently represent hydrogen or methyl group, and R 3 to R 5 each independently represent an alkyl group having 1 to 8 carbon atoms, wherein the resin is insoluble or poorly soluble itself in an alkali aqueous solution but becomes soluble in an aqueous solution by the action of an acid; (B) a resin obtained by protecting a portion of hydroxyl groups in poly(p-hydroxystyrene) with a protective group not dissociating by the action of an acid; and (C) an acid generating agent, wherein the protective group is an isopropoxy group or 1-pivaloyloxy group.