Patent ID: 7163776

Claim:
A positive-working resist composition comprising (A1) a resin containing a repeating unit represented by the following general formula (I) and at least one repeating unit selected from the group consisting of repeating units represented by the following general formulae (III) and (IV), wherein the resin increases the solubility in an alkali developing solution by the action of an acid: wherein R (I)-1 to R (I)-3 each independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a cyano group or an alkyl group which may be substituted; L 1 represents a divalent connecting group; and Z represents an acid-decomposable group; wherein R (III)-1 to R (III)-3 each independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a cyano group or an alkyl group which may be substituted, with the proviso that at least two of R (III)-1 to R (III)-3 are a fluorine atom; and R (III)-4 represents an alkyl group which may be substituted; and wherein R (IV)-1 to R (IV)-4 each independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom or an alkyl group which may be substituted, with the proviso that at least two of R (IV)-1 to R (IV)-4 are a fluorine atom.