Patent ID: 7749678

Claim:
A photoresist composition comprising (A) a resin that is decomposed by the action of an acid to increase solubility in an alkali developing solution, (B) a compound that generates an acid upon irradiation of an actinic ray or radiation, and (C1) a nonionic compound having a molecular weight of 1,000 or less and containing an aliphatic ring and a phenol ring, wherein the resin (A) comprises a repeating unit having a group represented by the following formula (I) and a repeating unit which has a group represented by at least one of the following formulae (V-I) to (V-4) or which is represented by the following formula (IV): wherein R 2 to R 4 each independently represents a hydrogen atom or a hydroxy group, provided that at least one of R 2 to R 1 represents a hydroxy group, R 1b to R 5b each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, or an alkenyl group, or two of R 1b to R 5b may be connected to each other to form a ring, R 1a represents a hydrogen atom or a methyl group, W 1 represents an individual group or a combination of two or more groups, selected from a single bond, an alkylene group, an ether group, a thioether group, a carbonyl group and an ester group, R a1 , R b1 , R c1 , R d1 and R e1 each independently represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, and m and n each independently represents an integer of from 0 to 3, provided that m+n is from 2 to 6, and wherein the photoresist composition is suitable for exposure with an ArF excimer laser.