Patent ID: 7135268

Claim:
A chemical amplification positive resist composition comprising a sulfonate of the formula (III′) or (VI′) wherein Q 6 , Q 7 , Q 8 , Q 9 and Q 10 each independently represent hydrogen, an alkyl having 1 to 16 carbon atoms, an alkoxy having 1 to 16 carbon atoms, or electron attractive group, with the proviso that at least one of Q 6 , Q 7 , Q 8 , Q 9 and Q 10 represents alkyl having 3 to 16 carbon atoms, and at least one of Q 6 , Q 7 , Q 8 , Q 9 and Q 10 is a nitro group, P 1 , P 2 and P 3 each independently represent hydrogen, hydroxyl, an alkyl having 1 to 6 carbon atoms or an alkoxy having 1 to 6 carbon atoms, and P 4 and P 5 each independently represent hydrogen, hydroxyl, an alkyl having 1 to 6 carbons atoms or an alkoxy having 1 to 6 carbon atoms, and resin which contains a structural unit having an acid labile group and which itself is insoluble or poorly soluble in an alkali aqueous solution but becomes soluble in an alkali aqueous solution by the action of an acid, wherein the structural unit having an acid-labile group is a structural unit derived from 2-alkyl-2-adamantyl(meth)acrylate or 1-(1-adamantyl)-1-alkylalkyl(meth)acrylate.