Patent ID: 6878502

Claim:
A positive resist composition comprising: (A) a resin which decomposes by the action of acid to increase the solubility in an alkali developer, the resin comprising: a repeating unit (1) represented by the following general formula (I); a repeating unit (2) represented by the following general formula (II) that is copolymerizable with the repeating unit represented by the general formula (I) and has the function of decomposing by the action of acid to increase the solubility of the resin in an alkali developer; and a repeating unit (3) that is inactive to the action of acid and free of an alkali-soluble group; and (B) a compound capable of generating an acid upon irradiation with one an actinic ray and a radiation: wherein R 5 represents a hydrogen atom, a halogen atom, a cyano group or an alkyl group which may have a substituent; R 6 and R 7 , which may be the same or different, each represent a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group or, an alkyl, a cycloalkyl, an alkoxyl, an acyl, an acyloxy, an alkenyl, an aryl or an aralkyl group, each of which may have a substituent; each of R 50 to R 55 , which may be the same or different, represents a hydrogen atom, a fluorine atom or an alkyl group that may have a substituent; at least one of R 50 to R 55 represents a fluorine atom or an alkyl group in which at least a hydrogen atom is substituted with a fluorine atom; wherein R 1 represents a hydrogen atom, a halogen atom, a cyano group an alkyl group which may have a substituent; R 2 and R 3 , which may be the same or different, each represents a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group or, an alkyl, a cycloalkyl, and alkoxyl, an acyl, an acyloxy, an alkenyl, an aryl or an aralkyl group, each of which may have a substituent; R 4 represents a group represented by the following general formula (IV) or (V): wherein R 11 , R 12 and R 13 , which may be the same or different, each represents an alkyl, a cycloalkyl, an alkenyl, an aralkyl, or an aryl group, each of which may have a substituent; two of R 11 to R 13 may connect together to form a ring; R 14 and R 15 , which may be the same or different, each represents a hydrogen atom or an alkyl group that may have a substituent; R 16 represents an alkyl, a cycloalkyl, an aralkyl or an aryl group, each of which may have a substituent; and two of R 14 to R 16 may connect together to form a ring.