Patent ID: 8202677

Claim:
A chemically-amplified positive resist composition comprising, as its main components, at least (A) a base polymer consisting of one or more monomer unit represented by the following general formula (1), the base polymer contains at least one unit with t being one or more: wherein R 1 represents a hydrogen atom or a methyl group; and R 2 represents an alkyl group or an alkoxy group having 1 to 6 carbon atoms, wherein t represents an integer of 0 to 2; and s represents an integer of 0 to 4, and one or more monomer unit represented by the following general formula (3); wherein R 4 represents any of a hydroxyl group, an alkyl group, and an alkoxy group having 1 to 6 carbon atoms, wherein v represents an integer of 0 to 4, wherein a hydroxyl group of the general formula (1) is partly protected by an acetal group represented by the following general formula (4); wherein R 5 represents a hydrogen atom, a linear, a branched, or a cyclic alkyl group having 1 to 10 carbon atoms, Y represents a linear or a branched alkyl group having 1 to 30 carbon atoms, and the polymer is insoluble or hardly soluble in an alkaline solution, while soluble in an alkaline solution when deprotected by an acid catalyst, (B) a sulfonium salt containing a sulfonate anion represented by the following general formula (5); (C) a basic component, and (D) an organic solvent.