Patent ID: 8507575

Claim:
A radiation-sensitive resin composition comprising: a first polymer including a repeating unit represented by a formula (I); and an acid generating component including a second polymer which includes a repeating unit represented by a formula (3), a radiation-sensitive acid generator other than the first polymer or the second polymer, or both thereof, the acid generating component generating an acid upon irradiation with actinic radiation or a radioactive ray, the first polymer serving as a base with respect to the acid where the radiation-sensitive resin composition is not irradiated with the actinic radiation or the radioactive ray, wherein R 1 represents a hydrogen atom, a methyl group or a trifluoromethyl group, R 2 represents a single bond, a linear or branched bivalent hydrocarbon group having 1 to 10 carbon atoms, a bivalent hydrocarbon group having 3 to 20 carbon atoms which has a cyclic structure formed by a part or all of the carbon atoms, or a group derived therefrom by substituting a part or all of hydrogen atoms with a fluorine atom, R 3 represents a single bond, a —O— group, a —C(═O)— group, a —O—C(═O)— group, a —C(═O)—O— group or a sulfinyl group, R 4 represents a single bond, a linear or branched bivalent hydrocarbon group having 1 to 10 carbon atoms, or a bivalent hydrocarbon group having 3 to 20 carbon atoms which has a cyclic structure formed by a part or all of the carbon atoms, A − represents —N − —SO 2 —R D , —COO − , —O − or —SO 3 − , wherein R D represents a linear or branched monovalent hydrocarbon group having 1 to 10 carbon atoms, a monovalent hydrocarbon group having 3 to 20 carbon atoms which has a cyclic structure formed by a part or all of the carbon atoms, or a group derived therefrom by substituting a part or all of hydrogen atoms with a fluorine atom, X + represents an onium cation, and “a” is 0 or 1, wherein an end of R 4 at SO 3 − side is other than —CF 2 —when A − is —SO 3 − , each of R 2 , R 3 and R 4 is not a single bond at a same time when A − is —COO − , and A − is other than —O — when “a” is 1, wherein, each of R 1 , R 2 and X + is respectively as defined in the formula (I), and n is an integer of 1 to 4, wherein the first polymer, the second polymer, or both thereof further includes a repeating unit represented by a formula (2), wherein R 1 is as defined in the formula (I), R 10 represents a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms, and each R 11 independently represents an alkyl group having 1 to 4 carbon atoms or a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms, or R 10 represents an alkyl group having 1 to 4 carbon atoms or a monovalent alicyclic hydrocarbon group having 4 to 20 carbon atoms, and two R 11 groups bond to each other to form a bivalent alicyclic hydrocarbon group having 4 to 20 carbon atoms together with the carbon atom to which the two R 11 groups are bound.