Patent ID: 7794913

Claim:
A chemically amplified positive resist composition comprising (A) a resin which comprises (i) a polymerization unit represented by the formula (I): wherein R 10 represents a hydrogen atom or a C1-C4 alkyl group, R 11 represents a C1-C4 alkyl group, p represents an integer of 1 to 3, and q represents an integer of 0 to 2, and when q is 1 or 2, R 11 s may be the same or different, (ii) a polymerization unit represented by the formula (II): wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents a C1-C8 alkyl group and ring X represents an alicyclic hydrocarbon group, and (iii) at least one polymerization unit selected from the group consisting of a polymerization unit represented by the formula (III): wherein R 3 represents a hydrogen atom or a C1-C4 alkyl group, and R 4 , R 5 , R 6 , R 7 and R 8 each independently represents a hydrogen atom, a C1-C4 alkyl group, a C1-C4 alkoxy group or a hydroxyl group and a polymerization unit represented by the formula (IV): wherein R 9 represents a hydrogen atom or a methyl group, n 1 represents 0 or 1, and R a represents an anthryl group which may be substituted with at least one selected from the group consisting of a C1-C6 alkyl group and a hydroxyl group, and (B) at least one acid generator.