Patent ID: 7211367

Claim:
A positive resist material comprising a photo acid generator comprising a compound of formula (1) wherein R 1 and R 2 may be the same or different and each represents a hydrogen atom or a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms; and Y represents a single bond, an oxygen atom, a nitrogen atom or an alkylene group having 1 to 4 carbon atoms; R 3 represents a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms or an aryl group having 6 to 16 carbon atoms, and may be substituted by an alkyl group having 1 to 4 carbon atoms, a fluorinated alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a fluorinated alkoxy group having 1 to 4 carbon atoms, a nitro group, a cyano group, a fluorine atom, a phenyl group, a substituted phenyl group, an acetyl group or a benzoyloxy group; X − represents a non-nucleophilic counter ion having 1 to 20 carbon atoms; and a base resin in which a hydrogen atom of a carboxyl group or a hydrogen atom of a phenolic hydroxyl group is substituted by an acid-labile group having an alkali dissolution controlling ability wherein the acid-labile group is dissociated by an action of an acid generated in light exposure so that solubility of the base resin in an alkali aqueous solution will increase.