Patent ID: 6921621

Claim:
A chemical amplification type positive resist composition comprising the following components (A) and (B): (A) polyhydroxystyrene in which at least a portion of hydrogen atoms of hydroxyl groups are substituted with a lower alkoxy-alkyl group having a straight-chain or branched alkoxy group and the lower alkoxy-alkyl group is eliminated by an action of an acid, and the solubility in an alkali solution of the polyhydroxy stylene increases when elimination occurs, and (B) a component capable of generating an acid by irradiation with radiation, wherein two or more kinds of mutually different lower alkoxy-alkyl groups are used as the lower alkoxy-alkyl group of the component (A), wherein at least one kind among the lower alkoxy-alkyl groups is a lower alkoxy-alkyl group having a straight-chain alkoxy group and at least one kind among other lower alkoxy-alkyl groups is a lower alkoxy-alkyl group having a branched alkoxy group, and wherein the component (B) comprises bisalkylsulfonyldiazomethane as a main component, and comprises an onium salt in an amount of 2 to 5% by weight based on the bisalkylsulfonyldiazomethane.