Patent ID: 8741541

Claim:
A photoresist composition, which comprises a resin comprising a structural unit derived from a compound represented by formula (I): wherein T 1 represents a single bond or a C6-C14 aromatic hydrocarbon group, L 1 represents a C1-C17 divalent saturated hydrocarbon group in which a methylene group may be replaced by an oxygen atom or a carbonyl group, L 2 and L 3 each independently represent a single bond or a C1-C6 divalent saturated hydrocarbon group in which a methylene group may be replaced by an oxygen atom or a carbonyl group, ring W 1 and ring W 2 each independently represent a C3-C36 hydrocarbon ring, R 1 and R 2 each independently represent a hydrogen atom, a hydroxyl group, or C1-C6 alkyl group, R 3 and R 4 each independently represent a hydroxyl group, or C1-C6 alkyl group, R 5 represents a hydroxyl group or a methyl group, m represents 0 or 1, and t and u each independently represent an integer of 0 to 2; a resin having a structural unit derived from a monomer having no acid-labile group but having a fluorine atom, said monomer being represented by formula (a-4-1) wherein R 41 represents a hydrogen atom or a methyl group, A 41 represents a moiety represented by formula (a-4-g1): in which ss represents an integer of 0 to 2, A 40 and A 43 respectively represent a C1-C5 aliphatic hydrocarbon group which may have a substituent, X 40 represents an oxygen atom, a carbonyl group, a carbonyloxy group, or an oxycarbonyl group, and R 42 represents a C1-C18 fluorine-containing aliphatic hydrocarbon group in which a methylene group may be replaced by —O— or —CO—; an acid generator; and a solvent.