Patent ID: 6908724

Claim:
A chemically amplifying type photoresist composition which comprises: (A) a fluorine-containing polymer having an acid-reactive functional group, (B) a photoacid generator and (C) a solvent, wherein the fluorine-containing polymer (A) having an acid-reactive group is a fluorine-containing polymer represented by the formula (2): —(M1)—(M2)—(N)— (2) in which {circle around (1)} the structural unit M1 is a structural unit derived from the fluorine-containing alicyclic monomer having an acid-reactive group of the formula (1): wherein the fluorine-containing polymer (A) having an acid-labile or acid-degradable group is a fluorine-containing polymer represented by the formula (3): —(M1)—(M2)—(M3)—(N)— (3) in which {circle around (1)} the structural unit M1 is a structural unit derived from the fluorine-containing alicyclic monomer having an acid-reactive group of the formula (1): in which A, B and C are the same or different and each is H, F, an alkyl group having 1 to 10 carbon atoms or a fluorine-containing alkyl group having 1 to 10 carbon atoms; R is a divalent hydrocarbon group having 1 to 20 carbon atoms, a fluorine-containing alkylene group having 1 to 20 carbon atoms or a fluorine-containing alkylene group having 2 to 100 carbon atoms and ether bond; a is 0 or an integer of from 1 to 3; b is 0 or 1; Y 2 is an acid-labile or acid-degradable functional group; provided that when b is 0 or R does not have fluorine atom, at least one of A to C is fluorine atom or a fluorine-containing alkyl group, {circle around (2)} the structural unit M2 is a structural unit derived from a fluorine-containing ethylenic monomer, in which A, B and C are the same or different and each is H, F, an alkyl group having 1 to 10 carbon atoms or a fluorine-containing alkyl group having 1 to 10 carbon atoms; R is a divalent hydrocarbon group having 1 to 20 carbon atoms, a fluorine-containing alkylene group having 1 to 20 carbon atoms or a fluorine-containing alkylene group having 2 to 100 carbon atoms and ether bond; a is 0 or an integer of from 1 to 3; b is 0 or 1; Y 2 is an acid-reactive functional group; provided that at least one of A to C is fluorine atom or a fluorine-containing alkyl group, {circle around (2)} the structural unit M2 is a structural unit derived from a fluorine-containing ethylenic monomer and {circle around (3)} the structural unit N is a structural unit derived from a monomer copolymerizable with M1 and M2, when M1+M2 is assumed to be equal to 100% by mole, the percent by mole ratio M1/M2 is 1 to 99/1 to 99, said polymer comprises from 1 to 99% by mole of the structural unit M1, from 1 to 99% by mole of the structural unit M2 and from 0 to 98% by mole of the structural unit N.