Patent ID: 7232642

Claim:
A chemically amplified positive resist composition comprising (A) a resin which comprises (i) at least one structural unit selected from the group consisting of structural units of the formulas (IV) and (V) wherein X 3 and X 4 each independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a perfluoroalkyl group having 1 to 4 carbon atoms, Z 3 and Z 4 each independently represents a divalent hydrocarbon group having 1 to 12 carbon atoms, n 3 and n 4 each independently represents an integer of 0 to 3, R 2 and R 3 each independently represents a hydroxyl group or a hydroxymethyl group, G represents —(CO)O— or —O—, R 4 represents an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and p and q each independently represents an integer of 0 to 2, (ii) a structural unit of the formula (I) wherein X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a perfluoroalkyl group having 1 to 4 carbon atoms, Z represents a divalent hydrocarbon group having 1 to 12 carbon atoms, R represents an alkyl group having 1 to 6 carbon atoms, and m represents an integer of 0 to 2, and (iii) a structural unit of the formula (II) wherein X 1 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a perfluoroalkyl group having 1 to 4 carbon atoms, Z 1 represents a divalent hydrocarbon group having 1 to 12 carbon atoms, n 1 represents an integer of 0 to 3, R 1 represents an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms, and Y represents at least two atoms necessary to form an alicyclic hydrocarbon group together with the adjacent carbon atom, and (B) an acid generator.