Patent ID: 7674567

Claim:
A positive resist composition comprising: (A1) at least one compound selected from a compound capable of generating an acid represented by the following formula (I) upon irradiation with actinic rays or radiation and a compound capable of generating an acid represented by the following formula (II) upon irradiation with actinic rays or radiation; (A2) a compound capable of generating an acid represented by the following formula (III) upon irradiation with actinic rays or radiation; and (B) a resin capable of decomposing under the action of an acid to increase its solubility in an alkali developer: wherein Rc 1 , Rc 2 and Rc 3 each independently represents an alkyl group substituted by at least one fluorine atom, or an aryl group substituted by at least one fluorine atom, and Rc 1 and Rc 2 may combine with each other to form a ring; wherein Ra 1 , Ra 2 , Ra 3 and Ra 4 each independently represents a hydrogen atom, a fluorine atom or a trifluoromethyl group, A represents a divalent or trivalent linking group selected from an oxygen atom, a sulfur atom, a nitrogen atom, a carbonyl group, a sulfonyl group, an ester group, an amide group, a sulfonamide group, an imino group, a urethane group, a urea group and a group formed by combining two or more thereof, Rc 4 represents an organic group, and when n1 is 2, two Rc 4 's may be the same or different or may combine with each other to form a ring, n1 represents 1 or 2, n2 represents an integer of from 1 to 3, n3 represents 0 or 1, and n4 represents an integer of from 1 to 3.