Patent ID: 6348297
Filing Date: 2002-02-19
Classification: C07C,G03F,Y10S

Abstract:
A chemical amplification type positive resist composition which comprises(1) an acid generator comprising an aliphatic sulfonium salt represented by the following formula (I): wherein Q1 represents an alkyl group, Q2 represents an alkyl or a residue of an alicyclic hydrocarbon and m represents an integer of 1 to 8; andat least one onium salt selected from triphenylsulfonium salts represented by the following formula (IIa) and diphenyiodonium salts represented by the following formula (IIb): wherein Q3, Q4, Q5, Q6 and Q7 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, and q and p represent a integer of 4 to 8; and(2) a resin which has a polymerization unit with a group unstable to an acid, and is insoluble or barely soluble in alkali by itself but changes soluble in alkali by an action of the acid.