Patent ID: 7220532

Claim:
A chemical amplification type positive resist composition comprising a nitrogen containing compound of the formula (IIIa): wherein X 2 represents alkylene having 1 to 4 carbon atoms or a single bond, R 5 represents hydrogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, haloalkyl having 1 to 12 carbon atoms, alkyl having 2 to 12 carbon atoms in which at least one —CH 2 — other than that binding to the adjacent group is substituted by —S— or —O—, alkoxy having 1 to 12 carbon atoms, or an aromatic hydrocarbon group optionally substituted, R 6 represent hydrogen, alkyl having 1 to 12 carbon atoms, cycloalkyl having 3 to 12 carbon atoms, haloalkyl having 1 to 12 carbon atoms, alkyl having 2 to 12 carbon atoms in which at least one —CH 2 — other than that binding to the adjacent group is substituted by —S— or —O—, alkoxy having 1 to 12 carbon atoms, an aromatic hydrocarbon group optionally substituted, or arylamino optionally substituted, and n 2 denotes an integer of 1 to 5, with the proviso that when n 2 is 2 or more, each of —X 2 —NR 5 —CO—R 6 in the formula (IIIa) may be different, a 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 and which further contains a structural unit derived from 2-norbornene and a structural unit derived from an aliphatic unsaturated dicarboxylic anhydride; and an acid generator of the formula (I): wherein Q 1 , Q 2 , Q 3 , Q 4 and Q 5 each independently represent hydrogen, hydroxyl, alkyl having 1 to 12 carbon atoms, alkoxy having 1 to 12 carbon atoms or an electron-withdrawing group, and Z + represents a group of the formula (Va), (Vb) or (Vc): a group of the formula (Va): wherein P 1 , P 2 and P 3 each independently represent hydrogen, hydroxyl, alkyl having 1 to 6 carbon atoms or alkoxy having 1 to 6 carbon atoms; a group of the formula (Vb): wherein P 4 and P 5 each independently represent hydrogen, hydroxyl, alkyl having 1 to 6 carbon atoms or alkoxy having 1 to 6 carbon atoms; a group of the formula (Vc): wherein P 6 and P 7 each independently represent alkyl having 1 to 6 carbon atoms or cycloalkyl having 3 to 10 carbon atoms, or P 6 and P 7 bond to form divalent acyclic hydrocarbon having 3 to 7 carbon atoms which form a ring together with the adjacent S + , and at least one —CH 2 — in the divalent acyclic hydrocarbon may be substituted by —CO—, —O— or —S—; P 8 represents hydrogen, P 9 represents alkyl having 1 to 6 carbon atoms, cycloalkyl having 3 to 10 carbon atoms or an aromatic group optionally substituted, or P 8 and P 9 bond to form 2-oxocycloalkyl together with the adjacent —CHCO—.